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Multitech MT1432BA User's Manual

1. 98 112 DIMENSIONS e E 15 DIP Switch Summary ssssusss 140 DIP SWICHES sad cceemdensrn dae 115 Disregard or Connect to Incoming Calls DIC or CIC 151 DSR CD Interaction Control amp SF 62 DTR Dialing EE 49 DTR Dialing D Command 151 DIR Dropout TIME RE sentis sta 81 PRH el E 31 Dual Tone Multi Frequency dialing 50 duMmb daliNd serres 57 E echnical Specifications 12 Enable Disable Auto Answer 111 Enable Disable Auto Reliable Fallback Charactere5 Enable Disable Command Mode 112 Enable Disable V 25bis Mode V Command 150 Enable Suppress Responses 109 Erase Callback Password RCBNxx 94 Erase Callback Phone Number RDNxx 94 Error Correction cic rnc verita ti inan 12 32 Error COMECUON EDT S 32 Escape Code Character sssssssssennnneseener eea 78 Escape Sequence Options E 74 Escape Sequences 44 AT CR 74 Examples of Assigning Values 84 Examples of Reading Values 84 Exiting Command Mode Going Back On Line O 75 Extended Result Codes 57 External Transmit Clock sseesssse 159 F Failed Passwo
2. suusss 145 Result CodeS issu 30 126 Result Codes Enable Disable and No Response Q 56 Result Codes Verbose Terse V 56 Retransmit Count P 65 ett Eeer ess dio etii ee 78 Return Character 2 oorr sioe 30 Return to Command Mode After Dial Execution 51 Reverse the Mode of Operation R 51 RingiINdi ato sis DUE 158 Rings Which Have Occurred 78 195232 Cable nic nina eme 154 RS232 Cable IBM PC 154 RS232C Interface Specifications 156 ber ER 31 S S Register Summary 143 S Registers cc ne en a am 30 E 28 SDLC BSC Option 109 Send Xon Xoff Characters X 67 Serial cable ssseee 31 125 Seral POM iocis 28 29 31 32 125 128 Serial Port Baud Rate SB 72 senal e rU 72 SESSIONS act th nevi etetat senec ae Me des diae 29 Set Pulse Dial Ratios amp P 50 Signal Grond EE 157 SIGNAL INFORMATION eee 156 Signal Strength information 75 Signal to Noise Ratio information SNR 75 SSMN 32 Ee elen E 111 Slow File Transfer itr 127 Smart dialih erc cC 57 Serge E 15 Speed Conversion BA 70 Speed SWICNES eraino eeh 113 Storing Phone Numbers D N 53 SUMMAI eer EU RI
3. 122 Multi Appendixes Multi lec Systems MultiModemBA User Guide Appendix A Troubleshooting 124 Your modem was thoroughly tested at the factory before it was shipped If you are unable to make a successful connection or if you experience data loss or garbled characters during your connection it is possible that the modem is defective However it is more likely that the source of your problem lies elsewhere Problems you may encounter include the following None of the LEDs light when the modem is on e The modem does not respond to commands e The modem dials but is unable to make a connection e The modem disconnects while on line e The modem cannot connect when answering e File transfer is slower than it should be lam losing data lam getting garbage characters on the monitor e can trun my fax and communications software at the same time If you experience problems please check the following possibilities before calling Tech Support see Chapter 10 None of the LEDs Light When the Modem Is On When you turn on the modem the LED indicators on the front panel should flash briefly as the modem runs a self test If the LEDs remain off the modem is probably not receiving power e Make sure the modem s power switch is on especially if you normally turn on the modem by turning on a power strip e fthe power supply is plugged into a power strip make sure the power strip is plugged in and
4. Command enables display of Windows 95 Autodetect characteristics Lists all stored telephone numbers in memory L5 lists all current operating parameters L6 lists all current S Register values L7 lists additional parameters L8 lists On Line Diagnostics L9 Displays Signal Strength Information L10 Displays Signal to Noise Ratio Information L11 Displays Noise Information LO means modems negotiate V 42 Mode L1 means MNP on and LAP M off L2 means LAP M on and MNP off L3 means no detection phase but go directly to LAP M MO means Monitor speaker always Off M1 means Monitor speaker On until carrier detected M2 means Monitor speaker always On M3 Monitor speaker on during dialing off during handshaking 2834 Series MB75 selects CCITT V 23 mode MB300 selects 300 bps on line MB1200 selects 1200 bps on line MB2400 selects 2400 bps on line MB4800 selects 4800 bps on line MB9600 selects 9600 bps on line MB14400 selects 14400 bps on line MB19200 selects 19200 bps on line MB28800 selects 28800 bps on line MB33600 selects 33600 bps on line 1432 Series MB75 selects CCITT V 23 mode MB300 selects 300 bps on line MB1200 selects 1200 bps on line MB2400 selects 2400 bps on line MB4800 selects 4800 bps on line MB9600 selects 9600 bps on line MB14400 selects 14400 bps on line Command amp Mn Nd Ne amp Qn amp Rn amp RP 2834 Series only Rn amp RFn Sr n Values
5. UP DOWN UP DOWN UP DOWN UP DOWN UP DOWN UP DOWN UP DOWN DOWN UP UP DOWN UP DOWN UP DOWN UP DOWN UP DOWN UP DOWN UP DOWN 115 MultiModemBA User Guide 116 11 Internal External Clocking UP Synchronous DOWN 12 Sync Async Mode UP DOWN Factory Default Setting DIP Switches 13 14 Note The modem baud rate command MBn overrides the setting of these speed selection switches DIP switches 13 and 14 2834 Series SWITCH 13 14 13 14 13 14 13 14 1432 Series SWITCH 13 14 13 14 13 14 13 14 932 Series SWITCH 13 14 13 14 13 14 13 14 CONDITION UP UP DOWN UP UP DOWN DOWN DOWN CONDITION UP UP DOWN UP UP DOWN DOWN DOWN CONDITION UP UP DOWN UP UP DOWN DOWN DOWN DIP Switches 15 16 SWITCH 15 15 16 16 CONDITION UP DOWN UP DOWN EFFECT 28 8 K bps Operation 19 2 K bps Operation 14 4 K bps Operation 9600 bps Operation EFFECT 14 4 K bps Operation 9600 bps Operation 4800 bps Operation 2400 bps Operation EFFECT 9600 bps Operation 4800 bps Operation 2400 bps Operation 1200 bps Operation EFFECT CD DSR from Interface CD DSR Forced On Not Used Not Used Standard Factory Default Setting Multi L Chapter 10 Warranty Service and Tech Support Multi e Systems MultiModemBA User Guide 10 1 10 2 Introduction This chapter starts out
6. n Oor1 x d 0 thru 9 d 0 thru 9 e any other number 0 thru 9 n Oor1 E n 0 1or2 t n Oor1 r n Oor1 z n 0 1or2 n Oor1 z n Oor1 r 2 0 11 13 15 19 24 26 29 30 32 34 Factory Default Setting Appendix D AT Command Summary Description 932 Series MB75 selects CCITT V 23 mode MB300 selects 300 bps on line MB1200 selects 1200 bps on line MB2400 selects 2400 bps on line MB4800 selects 4800 bps on line MB9600 selects 9600 bps on line amp MO selects Async when on line amp M1 selects Sync when on line Dial stored telephone number d Do not include the letter D in this command Number Linking If first number dialed is busy another stored number may be automatically dialed In example stored number d is dialed and if busy stored number e is dialed Exit Command Mode and go into On Line Mode Modem will pulse dial numbers following the P amp PO means 60 40 pulse ratio amp P1 means 67 33 pulse ratio QO means Result Codes sent Q1 means Result Codes will be suppressed quiet Q2 means Dumb Answer Mode amp QO selects Multi Tech command set amp Q1 selects AT command set RO means modem will not reverse modes R1 means modem will reverse modes amp RO lets Clear to Send act normally amp R1 forces Clear to Send on amp R2 drops for 1 second on disconnect Command Initiates a Retrain that makes the processor read Line Probe Information valid only in V
7. 63 MultiModemBA User Guide 64 V 42 Mode Select L The V 42 standard implements both MNP Class 3 amp 4 and LAP M error correction methods The V 42 Mode Select command ZL selects which type of error correction MNP or LAP M your modem uses for transmissions The various L command options are as follows LO Command The L0 Command allows a pair of modems to negotiate which V 42 mode MNP or LAP M will be used in their transmissions Originate Mode a If both modems have LAP M capability the modems use LAP M mode b If one or both modems do not have LAP M capability and both have MNP the modems use the MNP mode Answer Mode a The answering modem responds to either an MNP Link Request or LAP M Originator Detection Pattern ODP signal depending on which the originating modem issues L1 Command The ZL1 Command sets your modem to MNP error correction and disables LAP M This command is for Originate mode only In Answer mode the modem still accepts MNP or LAP M L2 Command The L2 Command sets your modem to LAP M error correction and disables MNP This command is for Originate mode only Answer mode still accepts MNP or LAP M L3 Command In the prior commands the modems use a two phase process to establish a V 42 connection detection to establish whether the remote modem is also error correcting and then protocol establishment to determine parameters and to establish the error correction connection If
8. Any repairs or alterations made by the user to this equipment or equipment malfunctions may give the telecommunications company cause to request the user to disconnect the equipment Users should ensure for their own protection that the electrical ground connections of the power utility telephone lines and internal metallic water pipe system if present are connected together This precaution may be particularly important in rural areas Caution Users should not attempt to make such connections themselves but should contact the appropriate electric inspection authority or electrician as appropriate Class A Statement FCC Part 15 This equipment has been tested and found to comply with the limits for a Class A digital device pursuant to Part 15 of the FCC Rules These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instruction manual may cause harmful interference to radio communications Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense This device complies with Part 15 of the FCC rules Operation is subject to the following two conditions 1 This device may not cause harmful interference
9. FCC rules On the outside surface of this equipment is a label that contains among other information the FCC registration number and ringer equivalence number REN If requested this information must be provided to the telephone company As indicated below the suitable jack Universal Service Order Code connecting arrangement for this equipment is shown If applicable the facility interface codes FIC and service order codes SOC are shown An FCC compliant telephone cord and modular plug is provided with this equipment This equipment is designed to be connected to the telephone network or premises wiring using a compatible modular jack which is Part 68 compliant See installation instructions for details The ringer equivalence number REN is used to determine the quantity of devices which may be connected to the telephone line Excessive REN s on the telephone line may result in the devices not ringing in response to an incoming call In most but not all areas the sum of the REN s should not exceed five 5 0 To be certain of the number of devices that may be connected to the line as determined by the total REN s contact the telephone company to determine the maximum REN for the calling area If this equipment causes harm to the telephone network the telephone company will notify you in advance But if advance notice isn t practical the telephone company will notify the customer as soon as possible Also you will be advised of yo
10. Fax Carrier Frequencies All Models 2834 and 1432 Series Carrier Frequencies 2834 Series 1432 Series 932 Series V 21CH2 Half Duplex 1650Hz Mark 1850Hz Space for Transmit Originate 1650Hz Mark 1850Hz Space for Transmit Answer V 27ter 1800Hz Originate Answer V 29 QAM 1700Hz Originate Answer V 17 TCM 1800Hz Originate Answer 1800 Hz V 32 V 32bis V 34 Enhanced V 34 33 6K 31 2K 28 8K 26 4K 24K 21 6K 19 2K 16 8K 14 4K 12K 9 6K 7 2K 4 8K 1800 Hz V 32 V 32bis 14 4K 12K 9 6K 4 8K 1800 Hz V 32 9 6K 7 2K 4 8K Carrier Frequencies 2400 amp 1200 bps V 22bis V 22 or Bell 212A Standard All models Carrier Frequencies 300 bps All models Carrier Frequencies V 21 All models Carrier Frequencies V 23 All models Transmit Level 2834 Series 1432 Series 932 Series Frequency Stability All models Transmit Originate 1200 Hz Transmit Answer 2400 Hz Receive Originate 2400 Hz Receive Answer 1200 Hz Bell Standard 1270 Hz Mark 1070 Hz Space for Transmit Originate 2225 Hz Mark 2025 Hz Space for Receive Originate 2225 Hz Mark 2025 Hz Space for Transmit Answer 1270 Hz Mark 1070 Hz Space for Receive Answer 980 Hz Mark 1180 Hz Space for Transmit Originate 1650 Hz Mark 1850 Hz Space for Transmit Answer 650 Hz Mark 1850 Hz Space for Receive Originate 980 Hz Mark 1180 Hz Space for Receive Answer 390 Hz Mark 450 Hz Space for Transmit Originate 1300 Hz Mark 2100 Hz Space for Transm
11. Not Used Standard Factory Default Setting Appendix F S Register Summary S REGISTER UNIT RANGE DEFAULT S0 1 ring 0 255 1 S1 1 ring 0 255 0 S2 ASCII 0 127 43 S3 ASCII 0 127 13 S4 ASCII 0 127 10 S5 ASCII 0 32 127 8 S6 1second 2 255 2 4 255 4 S7 1 second 1 255 45 1 45 55 1 55 S8 1 second 0 255 2 4 255 4 S9 100 mSec 1 255 6 S10 100 mSec 1 255 7 S11 1mSec 1 255 70 80 255 80 S13 ASCII 0 127 37 S15 Sec 10 255 20 S16 1 Attempt 1 255 4 S17 10 mSec 0 2 5 250 mSec S24 50 mSec 0 255 20 S25 100 mSec 0 255 0 S26 1 0 255 0 Values for International and DOC units only International only Appendix F S Register Summary DESCRIPTION Sets number of rings before modem answers Counts rings which have occurred Sets Escape Code character default is plus Sign Sets character recognized as RETURN default is CTRL M Sets character recognized as LINE FEED default is CTRL J Sets character recognized as BACKSPACE default is CTRL H Determines wait time for dial tone Determines how long modem waits for carrier before aborting call Sets pause time caused by a comma character in a dial command Sets carrier detect response time Sets delay time between when carrier is lost and when modem disconnects Sets time duration of and spacing between tones in tone dialing Defines Remote Configuration Escape Character Defines time delay for Callback attempts after initial passw
12. Rings Which Have Occurred Unit 1 ring Range 0 255 Default 0 Description 1 counts the number of rings that have occurred It is a read type of register and is seldom if ever used in typical operation Each time an incoming ring signal is detected S1 increases its value by one up to a maximum of 255 If you set S1 to a value other than its default value of zero or if the value is increasing with rings this new value remains stored in S1 for eight seconds after the last ring is counted after which time the value reverts to zero S2 Escape Code Character Unit ASCII Character Range 0 127 Default 43 4 Description S2 defines the escape code character The default character is the plus sign Decimal 43 but may be set for any ASCII character Setting an S2 value greater than 127 results in no escape character and therefore no means of entering Command mode from On line mode without breaking the on line connection S3 Return Character Unit ASCII Character Range 0 127 Default 13 M Description S3 defines the character recognized as Carriage Return RETURN or Enter S3 may be set for any ASCII character Chapter 6 S Registers S4 Line Feed Character Unit ASCII Character Range 0 127 Default 10 J Description S4 defines the character recognized as Line Feed S3 may be set for any ASCII character S5 Backspace Character Unit ASCII Character Range 0 127 Default 8 H De
13. of itself give an unconditional assurance of successful operation on every PSTN network termination point In the event of problems you should contact your equipment supplier in the first instance This equipment is designed to work with PSTN networks that accept analog signals Multi Tech does not currently know of any interoperating difficulties International Modem Restrictions Some dialing and answering defaults and restrictions may vary for international modems Changing settings may cause a modem to become non compliant with national telecom requirements in specific countries Also note that some software packages may have features or lack restrictions that may cause the modem to become non compliant New Zealand Telecom Warning Notice Use of pulse dialing when this equipment is connected to the same line as other equipment may give rise to bell tinkle or noise and may also cause a false answer condition Should such problems occur the user should NOT contact the Telecom Faults Service The preferred method of dialing is to use DTMF tones as this is faster than pulse decadic dialing and is readily available on almost all New Zealand telephone exchanges Warning Notice No 111 or other calls can be made from this device during a mains power failure Appendix K Regulatory Information FCC Regulations for Telephone Line Interconnection 1 This equipment complies with Part 68 of the Federal Communications Commission
14. subsequent re connection more likely Enter AT amp CDO amp WO CHs to execute a cleardown at disconnect default and enter AT amp CD1 amp WO CHs to disable the cleardown function 59 MultiModemBA User Guide 60 Auto Speed Detect ZA The function of the A command is to detect and select the operational data rates the starting speeds with which the modem uses for initial handshake and speed selection Remember this command does not control the originating data rate of the modem that is done by the Modem Baud Rate command MBn but only the Answer mode starting speeds Entering AT A0 or AT A causes the modem to operate starting at 2834 Series 33 600 bps with fallback to 28 800 to 19 200 to 14 400 to 9600 to 4800 to 2400 to 1200 and to 300 bps 1432 Series 14 400 bps with fallback to 9600 to 4800 to 2400 to 1200 and to 300 bps 932 Series 9 600 bps with fallback to 4800 to 2400 to 1200 and to 300 bps Entering AT A1 causes 2834 Series 33 600 bps operation only 1432 Series 14 400 bps operation only 932 Series 9 600 bps operation only Entering ATZA2 causes the modem to operate at starting speeds of 2834 Series 33 600 bps with incremental fallback to 28 800 19 200 14 400 9600 and 4800 bps 1432 Series 14 400 bps with incremental fallback to 29600 and 4800 bps 932 Series 9 600 bps with incremental fallback to 4800 bps The AT A3 command causes the modem all models to begin operati
15. the OH Off Hook LED lights to let you know the modem is operating as if you had picked up the handset to a phone The CD Carrier Detect LED lights to let you know the modem has detected a device it can connect to A speed LED lights to let you know at which speed the connection has been made To hang up a call enter ATH lt CR gt Your modem will return on hook just as if you had returned a phone s handset to its cradle Notice also that the OH CD and speed LED s are no longer lit Your video now displays OK signifying that your modem is ready for your next command The Answer Originate Voice Data Toggle Switch Located on the front of the modem is a Voice Data toggle switch with Originate Answer capabilities This switch enables the modem to automatically dial a phone number stored in the N1 location of memory whenever this switch is toggled Note that you must first enter AT VD1 amp WO CR This command string enables Voice Data dialing when the Voice Data toggle switch is activated If you are Manually dialing with an attached telephone device and not with your keyboard your modem originates when toggled in that position DOWN and if you are Manually answering modem is not configured to automatically answer via S Register SO setup the modem answers an incoming call when toggled in that position UP 33 MultiModemBA User Guide 34 Multi Chapter 4 Manual Dial and Automatic Answer Multi e
16. the modem initiates a retrain at 4800 bps If after the first retrain the modem returns on line at 33600 bps 14400 bps for 1432 models 9600 for 932 models the modem then starts a counter and a timer If three retrains occur within a two minute period the modem falls back to 4800 bps Entering AT F0 or ATZF allows no fallback when on line AT F1 allows the modem to fallback based on the error rate or if three retrains have occurred within a two minute period from 2834 Series 33 6K to 31 2K to 28 8K to 26 4K to 24K to 21 6K to 19 2K to 16 8K to 14 4K to 12K to 9 6K to 4 8K bps 1432 Series 14 4K to 12K to 9 6K to 4 8K bps 932 Series 9 6K to 4 8K bps The AT F2 command enables incremental fall back but also enables incremental fall forward if the phone line improves AT F2 is the factory default setting Enable Disable Lowspeed Fast Connect FC 2834 Series only Entering AT FCO amp WO CHR sets up the data pump so that it will not transmit a 5 second 2100 Hz signal Entering AT FCO amp WO lt CR gt allows the modem to transmit a 5 second 2100 Hz signal and is the factory default Cleardown at Disconnect amp CD 2834 Series only The amp CD command is used for control of cleardown at disconnect in V 32 V 32bis V 34 and V 34 enhanced modes A cleardown usually adds 1 2 seconds to the time it takes for the modem to go on hook after a disconnect A cleardown makes a disconnect by the remote modem easier to detect and a
17. to modem The RTS signal indicates to the modem that the computer or terminal has data that it wants to transmit Clear To Send Pin 5 CTS CB Direction from modem The CTS line indicates to the terminal that the modem will transmit any data present on the Transmit Data line pin 2 Data Set Ready Pin 6 DSR CC Direction from modem DSR On indicates that the modem is in the data mode and is connected to the communications channel This signal will be on during analog loop test mode Signal Ground Pin 7 SG AB The SG lead is connected to signal ground of the modem It establishes the common ground reference for all other interface signals Data Carrier Detect Pin 8 CD CF Direction from modem DCD On positive voltage indicates that data carrier has been received from the other modem This circuit will not normally turn on in the presence of message circuit noise or out of band signals There is a one second delay between when the carrier tone has been detected and when the CD circuit is turned on This signal goes off if received data carrier falls below the receiver threshold for more than 37 mSec When CD is off the Received Data circuit pin 3 is held to the marking state 157 MultiModemBA User Guide 158 Test Voltage Pin 9 XV Direction from modem The XV lead has 330 ohms of resistance to 12 volts DC This lead may be used to strap other signals high For example if the terminal does not supply a
18. 2 This device must accept any interference that may cause undesired operation Warning Changes or modifications to this unit not expressly approved by the party responsible for compliance could void the user s authority to operate the equipment Industry Canada This Class A digital apparatus meets all requirements of the Canadian Interference Causing Equipment Regulations Cet appareil numerique de la classe A respecte toutes les exigences du Reglement sur le materiel brouilleur du Canada Index Symbols ido 32 AE cuni LIMEN EE 32 SEIS i uunc cid EHI 32 amp T command E 101 16550 UART and Windows 3 1 29 A ADO Gr 79 ACCESSONES E 122 AGC Dynamic Range eeeeeeeeeeerrressrren 15 Answer lee EE 64 Answer Originate Voice Data Toggle Switch 33 E Re 110 een dati ro ats das teas tan 30 Assign Passwords Callback Phone for Numbers Pie m 93 Asynchronous Word Lenth Selection EB 68 Asynchronous Synchronous Operation 113 Dp 29 AT Command and S Register Summary 85 AT COMMANAS ER 44 AT Responses Multi Tech Responses 113 AVO ANS WO ccce onset m brain 30 31 Auto Reliable Buffering A 64 Auto Reliable Mode amp E1 63 B Backspace Character 79 Basic Result Code sniper manne 57 Basic Extended Result Codes 57 ee Ee EE 70 Baud rate OETAlPONT EE 31 Eege oni
19. 34 mode RO means disconnect after 12 retransmits R1 means do not disconnect after 12 retransmits amp RFO selects CTS follows RTS amp RF1 selects CTS to act independently Sets value of Register r to value of n where n is entered in Decimal format 135 MultiModemBA User Guide Command Values Description Sr r 2 0 11 13 Reads value of Register r and displays 15 19 24 26 value in 3 digit Decimal format 30 32 or 34 SBn n speed 2834 Series SB300 selects 300 bps at serial port SB1200 selects 1200 bps at serial port SB2400 selects 2400 bps at serial port SB4800 selects 4800 bps at serial port SB9600 selects 9600 bps at serial port SB19200 selects 19 200 bps at serial port SB38400 selects 38 400 bps at serial port 5B57600 selects 57600 bps at serial port SB115200 selects 115200 bps at serial port 1432 Series SB300 selects 300 bps at serial port SB1200 selects 1200 bps at serial port SB2400 selects 2400 bps at serial port SB4800 selects 4800 bps at serial port SB9600 selects 9600 bps at serial port SB19200 selects 19 200 bps at serial port SB38400 selects 38 400 bps at serial port SB57600 selects 57600 bps at serial port 932 Series SB300 selects 300 bps at serial port SB1200 selects 1200 bps at serial port SB2400 selects 2400 bps at serial port SB4800 selects 4800 bps at serial port SB9600 selects 9600 bps at serial port SB19200 selects
20. ACK flow control to monitor data integrity The modem can do UUCP spoofing where the modem is able to generate ACKs at the DTE interface Data then is transmitted more time efficiently because the delay of waiting for data to be received then waiting for the ACK to be returned at the remote end is eliminated Placing DIP Switch 4 in the DOWN position enables UUCP spoofing UUCP Spoofing Enabled Switch 4 DOWN UUCP Spoofing Disabled Switch 4 UP Factory Default Setting UP Chapter 9 DIP Switch Settings Switch 5 Enable Disable Auto Answer Ans Asynchronous Mode Synchronous Mode Dial Up In some originate only applications you may wish to disable the modem s automatic answering capabilities This may be true if you have a telephone set attached to a modem and wish to receive voice calls that you yourself would answer instead of the modem Place DIP Switch 5 in the UP position to enable Auto Answer Place DIP Switch 5 in the DOWN position to disable Auto Answer Auto Answer Enabled Switch 5 UP Auto Answer Disabled Switch 5 DOWN Factory Default Setting E UP Switch 5 Originate Answer Mode Asynchronous Synchronous Mode Leased Line The modem functions in either Originate mode or Answer mode Place DIP Switch 5 in the DOWN position to enable Originate mode Place DIP Switch 5 in the UP position to enable Answer mode Originate Mode Enabled Switch 5 DOWN Answer Mode Enabled Switch 5 UP Factory Default
21. Command and ignores nn identification string The disregard or connect to incoming calls commands are used for auto answer operations DIC stops the modem from answering incoming calls CIC causes the modem to answer incoming calls 139 MultiModemBA User Guide Appendix E DIP Switch Summary 140 Asynchronous Mode DIP Switch Condition Effect 1 UP DTR dependent on interface Down DTR forced On at all times 2 UP Hardware Flow Control Down Xon Xoff Flow Control 3 2834 Series UP 15 dB Transmission leased line Down 9 dB Transmission leased line 3 1432 and 932 Series UP 10 dB Transmission leased line Down 0 dB Transmission leased line 4 UP UUCP Spoofing Off Down UUCP Spoofing On 5 UP Automatic Answer On Down Automatic Answer Off 6 UP Max throughput On Down Max throughput Off 7 UP RTS dependent on Interface Down RTS forced On at all times 8 UP Disable Command Mode Down Enable Command Mode 9 UP Local Digital Loopback On Down Remote Digital Loopback On 10 UP Dial Up Operation Down Leased Line Operation 11 UP AT Responses Down Multi Tech Responses 12 UP Synchronous Mode On Down Asynchronous Mode On Factory Default Setting Synchronous Mode Appendix E DIP Switch Summary DTR Dependent On interface DTR forced On at all times SDLC Mode On BSC Mode On Command Mode Response Off Command Mode Response On AS 400 Mode Off AS 400 Mode On Answer Mode On Originate M
22. DTR Data Terminal Ready signal Pin 9 may be jumpered to Pin 20 DTR on the RS 232 connector or in the cable to force DTR on Transmit Clock Pin 15 TC DB Direction from modem The TC signal is provided only when the modem is used in the synchronous mode The clock is a square wave and is used to provide the computer or terminal with timing information for its Transmit Data circuit pin 2 This clock will be provided on the interface at all times when the modem is in Synchronous mode The first signal element of the Transmitted Data signal should be presented by the terminal on the first positive Off to On transition of TC which occurs after the CTS circuit on pin 5 has turned on The transmitted data is sampled by the modem on negative transition of TC Receive Clock Pin 17 RC DD Direction from modem The RC signal has the same characteristic of Transmit Clock with the exception that it is used to provide the computer or terminal with timing information for its Receive Data pin 3 circuit The negative transition On to Off of RC indicates the center of each signal element on the Received Data circuit Data Terminal Ready Pin 20 TR or DTR CD Direction to modem This signal TR or DTR provides a means for the terminal or computer to control the modem s connection to the communications channel A high DTR signal is required by the modem to be able to communicate Turning DTR off for more than 50 mSec will force the
23. In order for this command to work you must select Wait For Dial Tone dialing with the X2 or X4 command so that your modem will be able to detect the dial tone Return to Command Mode After Dial Command Execution A semicolon entered as the last character of a dialing command causes the modem to return to the Command mode immediately after executing the command instead of waiting for a carrier signal and going on line For example entering ATDT5551212 would tone dial the number and do nothing afterwards except go back into Command mode This can be useful in dialing applications where modem data transfer is not desired such as voice communications or in applications involving the use of touch tones as a data entry method such as bank by phone Reverse the Mode of Operation R In certain operations you may need to reverse the mode of operation for your modem from originate to answer or answer to originate so that it would answer the phone and go into answer mode This command turns off the reversing function with the RO command and turns it on with the R1 command with the modem in either command mode If you want to reverse from the originate mode use R with no number in the dialing string Flash On Hook Some switchboard systems react to a momentary On Hook An exclamation mark inserted in the command causes the modem to flash on hook for a half of a second as if you had held the switch hook button on a telephone down for
24. Setting UP Switch 6 Maximum Throughput Setting Asynchronous Mode Leased Line Dial Up Some applications require you to dial into services with maximum throughput on and other applications where maximum throughput must be off i e service not supporting error correction or the V 42 handshake interferes with logon sequence DIP Switch 6 is used for switching between these two modes This DIP Switch controls three important parameters error correction speed conversion and serial port speed which in effect enables or disables maximum throughput Maximum Throughput Enabled Switch 6 UP Maximum Throughput Disabled Switch 6 DOWN Factory Default Setting UP Switch 6 Slave Clocking Synchronous Mode Leased Line Dial Up In Synchronous mode DIP Switch 6 controls the option of having timing controlled by the receive clock The originate modem in effect adjusts to the answer remote modem Place DIP Switch 6 in the DOWN position to enable Slave Clocking Place DIP Switch 6 in the UP position to disable Slave Clocking Slave Clocking Enabled Switch 6 DOWN Slave Clocking Disabled Switch 6 UP Factory Default Setting UP 111 MultiModemBA User Guide 112 Switch 7 Request To Send Forced RTS Asynchronous Synchronous Mode Leased Line Dial Up If your computer or terminal uses RTS CTS protocol typically used in some synchronous applications but also if using hardware pacing for V 42 error correction or sp
25. To store phone d 0 thru 9 number s is entered and followed by N and then Directory Number d amp DO DTR is ignored amp D1 means modem returns to command mode amp D2 lets modem react to DTR normally amp D3 causes modem to reset to modem default parameters DF0 Line Probe Data in Graph Format DF1 Line Probe Data in Table Format DP0 do not read Line Probe Information from DSP during handshaking DP1 read Line Probe Information from DSP during handshaking DO disables DTR Dialing D1 enables DTR Dialing EO means do not echo Command Mode Character E1 means do echo Command Mode characters Command amp En EBn En Fn amp Fn Fn amp Gn Hn Values n 0 thru 15 n 20or 1 n 0 thru 5 n 0thru2 n 0 80or9 n Oor1 n 0 1or2 n Oor1 Factory Default Setting Appendix D AT Command Summary Description SEO means no error correction amp E1 means V 42 Auto reliable Mode amp E2 means V 42 Reliable Mode amp E3 means no modem initiated flow control amp E4 means CTS modem initiated flow control amp E5 means Xon Xoff modem initiated flow control amp E6 means Xon Xoff not passed through amp E7 means Xon Xoff passed through amp E8 means Enq Ack pacing off SEO means Enq Ack pacing on amp E10 means Normal Mode flow control off amp E11 means Normal Mode flow control on amp E12 means Pacing off amp E13 means Pacing on amp E14 means data compression d
26. and is sometimes referred to as DTMF or Dual Tone Multi Frequency dialing The method used is selected by including a P for Pulse or a T for Tone in the dialing command right before the digits you wish to have dialed in that manner For example you would pulse dial the number 555 1212 by entering ATDP5551212 and hitting RETURN You could tone dial the same number by entering ATDT5551212 and hitting RETURN If neither Pulse nor Tone dialing is specified in the dial command the modem uses whatever method used last If the modem has been reset or just powered up it uses Pulse dialing even if the letter P is not included in your dial command Nearly all telephone systems in the U S are now compatible with tone dialing Since that is the faster method you will probably choose the tone method for your dialing An example of combining pulse and tone dialing could involve a PBX system where 9 had to be pulse dialed first then the rest of the number tone dialed after pausing for a second dial tone The number would be dialed by entering ATDP9 T5551212 and RETURN The comma causes a pause which we ll explain soon Set Pulse Dial Ratios amp P This command sets the time ratios between the open and closed portions of the dialing pulse frequencies To set the dialing pulse ratio of 60 mSec to 40 mSec enter AT amp PO To set a ratio of 67 mSec to 33 mSec enter AT amp P1 The factory default is amp PO Chapter 5 Command Mode Automatic P
27. dialing of these numbers will be delayed time specified by a country regulation and an appropriate message displayed If the number is retried more than the maximum allowed number of times number is also specified by country regulation it is placed on the Forbidden Numbers list and no further retries will be allowed When the Forbidden Numbers list is full no dialing is allowed and a CFIFF indication is given The modem in AT command mode will respond with NO CARRIER If country regulations require that the Forbidden Numbers list be checked in AT mode then NO CARRIER will be the response to a dial attempt in AT mode Numbers will also be put on the Forbidden Numbers list if the Delayed Numbers list is full and a new number fails for the first time In that case the new number will be added to the Delayed Number list and the oldest existing number added to the Forbidden Numbers list Numbers are removed from the Forbidden Numbers list by after a certain time has past also by country regulation Some country regulations have numbers remain on the Forbidden Numbers list permanently The Delayed Number and Forbidden Numbers lists are eight numbers long 20 characters each V 25bis Operation Operation in V 25bis mode is similar to AT command mode in that certain DIP Switch functions are important to its operation V 25bis does not include any speed detection for asynchronous mode so when you are giving commands you must stay in your initial spe
28. disconnect and then bring the signal s up again S24 defines the length of time that the signals drop The default setting of 20 results in a one second drop time which is what most PBX CBX systems with this requirement need DTR Dropout Time Unit Range Default Description 100 mSec 0 1 through 255 0 S25 defines the amount of time that DTR must be dropped before the modem disconnects Typically a disconnect occurs when DTR is dropped for 50 milliseconds or more This dropout time can be increased up to a maximum of 25 5 seconds The S25 unit value for zero is the default value of 50 mSec For values from 1 through 255 the unit value is 100 mSec 81 MultiModemBA User Guide 82 S26 Failed Password Attempts Unit Range Default Description S29 1 failed attempt 0 255 0 S26 counts the number of times there has been a failed password attempt For example if you entered ATS26 the message 003 would be displayed meaning someone has failed three times to gain access to your modem using its password security system Local Inactivity Timer Unit Range Default Description S30 minutes 1 255 20 S29 defines the amount of idle time that can elapse between AT commands after the SETUP password has been entered If this timer expires the LOGIN and SETUP passwords will have to be re entered S29 only takes effect when the modem has been sent a ZDB1 command which secures the modem from local an
29. displayed in either verbose full words or terse digits format This is controlled by the ATVO terse or ATV1 verbose commands The modem defaults to verbose format AT amp Q0 selects Multi Tech responses with Reliable LAPM Compression modifiers The terse response code for CONNECT 2400 is 9 AT amp Q1 selects Standard AT command set responses The terse result code for CONNECT 2400 is 10 The following tables define the result codes generated by the amp Q command refer to Appendix G for Result Code Summary Multi Tech Result Codes 2834 Series TERSE VERBOSE TERSE VERBOSE 0 OK 11 CONNECT 4800 1 CONNECT 12 CONNECT 9600 2 RING 13 CONNECT 14400 3 NO CARRIER 19 CONNECT 19200 4 ERROR 21 CONNECT 21600 5 CONNECT 1200 24 CONNECT 24000 6 NO DIALTONE 26 CONNECT 26400 7 BUSY 28 CONNECT 28800 8 NO ANSWER 31 CONNECT 31200 9 CONNECT 2400 33 CONNECT 33600 1432 Series TERSE VERBOSE TERSE VERBOSE 0 OK 7 BUSY 1 CONNECT 8 NO ANSWER 2 RING 9 CONNECT 2400 3 NO CARRIER 11 CONNECT 4800 4 ERROR 12 CONNECT 9600 5 CONNECT 1200 13 CONNECT 14400 932 Series TERSE VERBOSE TERSE VERBOSE 0 OK 6 NO DIAL TONE 1 CONNECT 7 BUSY 2 RING 8 NO ANSWER 3 NO CARRIER 9 CONNECT 2400 4 ERROR 11 CONNECT 4800 5 CONNECT 1200 12 CONNECT 9600 With MNP error correction on RELIABLE or R is added to these result codes With LAP M error correction on LAP M or L is added to these result codes With data compression on COMPRESSE
30. establish read and modify various modem options All of the S Registers are charted and explained followed by instructions on accessing the S Registers and reading or changing their values Chapter 7 Callback and Remote Configuration Chapter 7 documents instructions on how to operate the modem s Callback and Remote Configuration features and the usage of LOGIN Passwords Set Up Passwords and Remote Escape Characters as network management tools Chapter 8 Testing Your Modem Chapter 8 covers the modem s built in test features These are Power on Self Test Back To Back Test Local Analog Loopback Digital Loopback and Remote Digital Loopback Tests We have included a description of each test and how to use each test procedure Chapter 9 DIP Switches Chapter 9 covers the modem s printed circuit board options Sixteen DIP Switch settings and the modem s speaker volume control are explained in detail including all default settings Chapter 10 Warranty Service amp Technical Support Chapter 10 provides statements on your five year warranty instructions for getting modems serviced at the factory the procedure for downloading firmware upgrades via FlashROM information about Multi Tech s Bulletin Board Service BBS a section on receiving technical support via the CompuServe Internet forums and information on Multi Tech s Fax Back Service Appendixes There are also several appendices at the end of this manual most of whic
31. its power switch is on e Make sure the power supply module is firmly connected to the modem and to the wall outlet or power strip e Ifthe power strip is on and the modem switch is on try moving the modem power supply to another outlet on the power strip e Test that the outlet is live by plugging a lamp into it e The modem or power supply may be defective If you have another Multi Tech modem try swapping modems If the problem goes away the first modem or power supply may be defective Call Tech Support for assistance CAUTION Do not under any circumstances replace the power supply module with one designed for another product as it may damage the modem and void your warranty The Modem Does Not Respond to Commands e Make sure the modem is plugged in and turned on See None of the LEDs Light When the Modem Is On e Make sure you are issuing the modem commands from the data communications software either manually in terminal mode or automatically by configuring the software You cannot send commands to the modem from the DOS prompt e Make sure you are in terminal mode in your data communications program then type AT and press ENTER If you get an OK response your connections are good and the problem likely is in your phone book entry or session settings e Try resetting your modem by turning it off and on Make sure there is a reset command amp F in your initialization string or your modem may not initialize correc
32. its current parameters in non volatile RAM and modem will load these for future sessions instead of reading factory ROM defaults unless amp F command used amp W1 causes modem to not store parameters XO selects Basic Result Codes w o CONNECT 1200 CONNECT 2400 X1 selects Extended Result Codes w CONNECT 1200 CONNECT 2400 X2 selects Standard AT Command set with NO DIAL TONE X3 selects Standard AT Command set with BUSY X4 selects Standard AT Command set with NO DIAL TONE and BUSY X0 selects single XOFF character sent until XON level returns X1 selects multiple XOFF characters after buffer level is full YO disables sending or responding to long space break Y1 enables sending or responding to long space breaks All configuration parameters are reset to default values Causes pause during dialing Causes return to Command Mode after dialing Causes modem to flash On Hook Causes modem to wait for ringback then 5 seconds of silence before processing next part of command 137 MultiModemBA User Guide Command AT lt CR gt BREAK AT lt CR gt Description In band Escape Sequence Places modem in Command Mode while still remaining On Line Enter followed by the letters A and T up to ten command characters and a RETURN Out of band Escape Sequence Places modem in Command mode while still remaining On Line Enter a BREAK signal followed by the letters A and T up to sixty comman
33. new product information product upgrade files and problem solving tips The phone number for the Multi Tech BBS is 800 392 2432 USA and Canada or 612 785 3702 international and local 120 The BBS can be accessed by any asynchronous modem operating at 1200 bps to 33 600 bps at a setting of 8 bits no parity and 1 stop bit 8 N 1 To log on to the Multi Tech BBS 1 2 3 Set your communications program to 8 N 1 Dial our BBS at 800 392 2432 USA and Canada or 612 785 3702 international and local At the prompts type your first name last name and password then press ENTER If you area first time caller the BBS asks if your name is spelled correctly If you answer yes a questionnaire appears You must complete the questionnaire to use the BBS on your first call Press ENTER until the Main Menu appears From the Main Menu you have access to two areas the Files Menu and News For help on menu commands type To Download a file If you know the file name D Foz 7 8 From the Main Menu type F to access the Files Menu then type D Enter the name of the file you wish to download from the BBS If a password is required enter the password Answer Y or N to the automatic logoff question Select a file transfer protocol by typing the indicated letter such as Z for Zmodem the recommended protocol If you select Zmodem the transfer will begin automatically If you select another protocol you may ha
34. on your keyboard and hit RETURN Then hang up the headset Unless you have a specific need to dial in this manner we recommend you use the first method where the telephone number is entered on your keyboard The modem gives you several choices of dialing methods You can use tone or pulse dialing by inserting a letter Tor a Pin the command string See Section 5 4 2 on Dial Modifiers You can also configure the modem to either wait for and detect dial tones and busy signals which we call Wait for Dial Tone dialing or Smart dialing or work with timed pauses without dial tone and busy signal detection which we call Blind dialing see Section on X Command Note There is another method of dialing called DTR Dialing where by manipulating the DTR signal on pin 20 of the RS 232C V 24 interface a number stored in the modem s memory is automatically dialed See description of D command in this section for details Continuous Redial not used in BAI A or If you select the Wait For Dial Tone method of dialing see X3 or X4 command you can command the modem to continuously redial up to 10 re dials for DOC units a busy number until your call is answered This is done with the A command This command would be used only if you had already reached a busy number after executing a normal dial command You simply enter A you need not enter AT nor do you need to hit RETURN and the modem will redial the number for you If
35. pacing and data compression enabled the command line would be ATX4 amp E1 amp E5 amp E13 amp E15DT16126313550N3 This would store the entire command at location N3 Number Linking NN You may command the modem to dial another number automatically if the first number dialed is busy This would be useful in a situation where a computer can be accessed through more than one phone number This is called linking To link the number in N1 to the number N2 simply enter ATN1N2 and hit RETURN Several numbers can be linked in the same command For example you could link N1 to N2 to N3 to N4 by entering ATN1N2N3N4 and RETURN or you could link N1 to N2 and back to N1 and then back to N2 by entering ATN1N2N1N2 and RETURN The only limit on the number of numbers that can be linked is the 60 characters allowed in a command line Number linking can not be used with blind dialing since busy signals would not be detected You would have to select the Wait for Dial tone dialing method using the X Command in order to use the Number Linking feature Listing Numbers Stored in Memory L Telephone numbers that you have stored in the modem s memory may be listed and displayed with the L command It will display all ten stored N numbers in a format like that shown below All digits and command letters will be shown The number s name 0 thru 9 is shown first followed by the complete dialing command and telephone number as originally entered Simply ent
36. remains on the forbidden list for 1 hour after entry to forbidden list 4 Delayed and Forbidden Numbers lists are checked when dialing in AT command mode If dialing is not possible then No Carrier is the response Auto Answer behavior 1 Auto Answer in 5 seconds if no DIC Command indication modifications 1 Dialing digit means wait for dialtone acts the same as in dialing string Delay and Forbidden list behavior 5 retries without delay 2 minute delay between next 4 retries After 9 retries the number is put on the forbidden list 120 minute timer is started on entry to delay list When it runs out the number is removed from whichever list it is on o 5 amp D 153 MultiModemBA User Guide Appendix I MultiModemBA Cables These cables connect your modem to your terminal or computer s serial port 25 PIN DTE 25 PIN DCE Connector Figure l 1 RS232 Cable IBM PC RED Tip Cu GREEN Ring CS To Terminal RJ 11 Type Block Screws Modular Plug Transmit and Receive Figure l 3 Two Wire Leased Line Connection 154 Appendix J RS 232C Interface Specifications 8 POS MINI DIN FEMALE al Ui 25 POS 8 POS MALE DSUB Figure l 2 MAC Cable 155 MultiModemBA User Guide Appendix J RS 232C Interface Specifications The modem s RS 232C interface circuits ha
37. s Input Output range and Interrupt Request If another device is using the same address range or IRQ it will appear in the Conflicting Device List Uncheck Use Automatic Settings to change the port s settings so they do not conflict with the other device or select the port the conflicting device is on and change it instead If you need to open your computer to change switches or jumpers on the conflicting device refer to the device s documentation The serial port may be defective If you have another serial port install the modem on it change the COM port setting in your software and try again The modem may be defective If you have another Multi Tech modem try swapping modems If the problem goes away the first modem is possibly defective Call Tech Support for assistance see Chapter 10 125 MultiModemBA User Guide 126 The Modem Dials But Cannot Make a Connection There can be several reasons the modem fails to make a connection Possibilities include lack of a physical connection to the telephone line a wrong dial tone a busy signal a wrong number no modem at the other end a faulty modem computer or software at the other end incompatibility between modems You can narrow the list of possibilities by using extended result codes To enable them enter ATV1XA and press ENTER while in terminal mode or include V1X4 in the modem s initialization string When you dial again the modem will report the call s prog
38. s default disables 300 bps V 42 error correction altogether AT E0 No V 42 Error correction at 300 bps AT E1 V 42 Error Correction at 300 bps The factory default setting is EO 65 MultiModemBA User Guide 66 5 4 9 Flow Control Commands Flow control refers to the techniques used by computer devices to stop and restart the flow of data to and from each other Flow control is necessary so that a device does not receive more data than it can handle In the case of the MultiModem there is a need for flow control in both directions As illustrated on the next page flow control for data passing from your computer to the modem is called Modem Initiated Flow Control and flow control for data passing from the modem to your computer is called Computer Terminal Initiated Pacing The MultiModem supports both hardware and software Modem Initiated Flow Control On the Computer Terminal Initiated Pacing side it supports hardware and software flow control and a special version used by Hewlett Packard compatible systems called ENQ ACK Pacing The modem allows hardware and software pacing to be passed through the modem to the other end of the link so that your computer or terminal can control data start stop activity through your modem This is called Xon Xoff Pass Through To state it simply Flow Control is something the modem does to the computer while Pacing is something the computer does to the modem Modem Initiated Flow Control RS
39. so that it drops for one second on disconnect and then comes up again enter the command AT amp H2 If you want the drop time to be something other than one second use S Register S24 to change this value Refer to Chapter 6 61 MultiModemBA User Guide 62 Data Set Ready Control amp S The amp S command allows you to control the status of the Data Set Ready signal DSR pin 6 on the RS 232C interface You have three choices You can force the signal high allow it to act normally or set it to stay high until the modem disconnects go low momentarily and then go high again The last option is useful with some CBX phone systems and mainframe front ends which require DSR to act in this manner To allow DSR to act normally enter the command AT amp S1 the default setting To force DSR on enter the command AT amp S0 To set up DSR so that it drops for one second on disconnect and then comes up again enter AT amp S2 If you want the drop time to be something other than one second use S Register S24 to change this value Refer to Chapter 6 CTS RTS Interaction Control amp RF In typical operation Clear to Send follows Request to Send when the modem is on line In other words if RTS goes off CTS goes off in response The amp RFO command enables CTS to follow RTS In some applications however it may be necessary for CTS to operate independent of RTS amp RF1 allows CTS to operate independently regardless of the state of RTS
40. the forbidden list 3 The number remains on the forbidden list forever C Auto Answer behavior 1 Auto Answer mode after 2 rings if no DIC 3 Austria a Command Indication modification none b Delayed and Forbidden list behavior 1 No delay between retries 2 After 2 retries to numbers that answer but give no answer tone CFINT the number is put on the forbidden list 3 After 10 retries with busy or no dialtone the number is put on the forbidden list 4 The number remains on the forbidden list forever 5 Delayed and Forbidden Numbers lists are checked when dialing in AT mode If dialing is not possible then NO CARRIER is the response C Auto Answer behavior 1 Auto Answer in 5 seconds if no DIC 4 France c 5 Belgium a b c 6 Singapore a b Appendix H V 25bis Operation Command Indication modification none Delay and Forbidden list behavior 1 2 min delay after 1st call 4 after 2nd 6 after 3rd etc 2 After 5 retries the number is put on the forbidden list 3 The number remains on the forbidden list forever 4 Delayed and Forbidden Numbers lists are checked when dialing in AT command mode If dialing is not possible then No Carrier is the response Auto Answer mode behavior 1 Auto Answer in 5 seconds if no DIC Command Indication modification none Delay and Forbidden list behavior 1 1 min delay between calls 2 After 4 retries the number is put on the forbidden list 3 The number
41. the modem to both originate and answer calls To originate calls in Asynchronous mode you will most likely use the modem s Command mode and give the modem automatic dialing commands we will delay our discussion of the Command mode until Chapter 5 When using your modem in Synchronous mode the Command mode is disabled so you must automatically dial your calls with a telephone set To use manual dialing you first connect an ordinary telephone set either touch tone or rotary dial to the modem s PHONE Jack if you have not already done so Next set the speed selection DIP Switches 13 and 14 to the speed at which you wish to communicate These DIP Switches are located on the side of the modem Refer to Chapter 9 for DIP Switch settings Your computer or terminal may be set for up to 115 200 bps 57 600 bps for 1432 models 37 800 bps for 932 models When your telephone set is connected you can use it to dial the modem you wish to call Simply dial the number and then listen to the dialed modem s answer tone When you hear it press the Voice Data switch on the front of the modem down to the Originate position You don t have to hold it down Just toggle it press it once and let it go Once you press the switch the tone you hear should change to another pitch or change into a rough sounding scrambled noise You then replace the telephone handset in its cradle and your data communications begins Note that the modem may call manual
42. when it is reset with an ATZ command the modem reads all of its configuration and S Register parameters from RAM and not from the factory settings in ROM note you may recall factory installed defaults by entering AT amp F8 amp WO The amp W command changes the configuration parameters stored in RAM that you specifically intend to alter All other default parameters remain unchanged The AT amp W1 command sets the modem so that it does not store its parameters in RAM and on power up or when an ATZ command is issued parameters are read from the factory default settings in ROM Before using the amp W command you may want to view the modem s current operating parameters Use the ATL5 ATL6 and ATL7 commands to display the current modem configuration 85 MultiModemBA User Guide 86 Multi Chapter 7 Callback Security and Remote Configuration Multi Te Systems MultiModemBA User Guide T 1 7 2 88 Introduction This chapter describes how the MultiModem s Callback and Remote Configuration features operate These features use a multilevel security system which involves the use of LOGIN Passwords Setup Passwords and Remote Escape Characters The primary level security code is the modem s LOGIN Password Once this password is entered other passwords can be used For instance entering the LOGIN Password will allow you to enter the Setup Password which in turn allows you to enter Callback Passwords and dial bac
43. will work better with error correction turned off For example it has been reported that on CompuServe error correction will slow file transfers at modem speeds of 9600 bps and under If this is a problem for you you can turn off error correction with the command AT amp EO or you can include the command in your initialization string as follows AT amp F S0 0 X4 amp EO M 3 8 3 9 Chapter 3 Software Configuration Modem Basics You control your modem by issuing AT commands setting S Registers and setting DIP Switches You can easily change the settings of your DIP Switches as they are located on the right side of your modem s chassis Right now your modem is set up for the most typical user application that is as a traditional modem set to make a dial up call to a remote installation where the call is answered automatically therefore you shouldn t need to change the DIP Switches If however you know that your application does not follow this profile please refer to Chapter 9 for full details on DIP Switch settings While you may operate your modem manually it is more likely that you will use your data communications software to either e enter terminal mode where you can speak most directly to the modem by issuing AT commands or to e launch a datacomm session through a set of modem configurations which you select and then associate with a target telephone number Once you have created saved and named this set o
44. with statements about your modem s 5 year warranty The next section Tech Support should be read carefully if you have questions or problems with your modem It includes the technical support telephone numbers space for recording your modem information and an explanation of how to send in your modem should you require service The final four sections explain how to use our Bulletin Board Service BBS upgrading the modem via Flash PROM a brief section on the CompuServe Internet forums and information on Multi Tech s Fax Back Service Limited Warranty Multi Tech Systems Inc MTS warrants that its products will be free from defects in material or workmanship for a period of five years from the date of purchase or if proof of purchase is not provided five years from date of shipment MTS MAKES NO OTHER WARRANTY EXPRESSED OR IMPLIED AND ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED This warranty does not apply to any products which have been damaged by lightning storms water or power surges or which have been neglected altered abused used for a purpose other than the one for which they were manufactured repaired by the customer or any party without MTS s written authorization or used in any manner inconsistent with MTS s instructions MTS s entire obligation under this warranty shall be limited at MTS s option to repair or replacement of any products which prove to be defective
45. within the warranty period or at MTS s option issuance of a refund of the purchase price Defective products must be returned by Customer to MTS s factory transportation prepaid MTS WILL NOT BE LIABLE FOR CONSEQUENTIAL DAMAGES AND UNDER NO CIRCUMSTANCES WILL ITS LIABILITY EXCEED THE PURCHASE PRICE FOR DEFECTIVE PRODUCTS 10 2 1 On line Warranty Registration To register your MultiModem on line click on the following link http www multitech com register 118 Chapter 10 Warranty Service and Tech Support 10 3 Tech Support 10 4 Multi Tech has an excellent staff of technical support personnel available to help you get the most out of your Multi Tech product If you have any questions about the operation of this unit call 1 800 972 2439 Please fill out the modem information below and have it available when you call If your modem requires service the tech support specialist will guide you on how to send in your modem see Section 10 3 2 10 3 14 Recording Modem Information Please fill in the following information on your Multi Tech modem This will help tech support in answering your questions Modem Model No Modem Serial No Modem Firmware Version COM Port FAX Software Type and Version DataComm Software Type and Version The modem model and serial numbers are silkscreened on the bottom of your modem The software versions are printed on the diskette labels Type ATI1 to display the modem firmware v
46. 19 200 bps at serial port SB38400 selects 38400 bps at serial port amp SFn n Oor1 amp SF0 selects DSR follows CD amp SF1 selects DSR independent amp Sn n 0 1or2 amp SO0 forces Data Set Ready On amp S1 lets Data Set Ready act normally amp S2 Data Set Ready drop is regulated by S24 on disconnect SPn n Oor1 SPO disables UUCP Spoofing SP1 enables UUCP Spoofing T Modem will tone dial numbers following the T amp Tn n 4or5 amp T4 means Enable Response to Request for Remote Digital Loopback amp T5 means Disable Response to Request for Remote Digital Loopback Tn n Oor1 TO turns off Trellis Coded Modulation g T1 turns on Trellis Coded Modulation Factory Default Setting 136 Command Un VDn Vn amp Wn Xn Yn Values n 0 1 2 or3 n Oor1 n Oor1 n Oor1 n 0 1 2 3 or 4 nz O or 1 n Oor1 In Dial Command In Dial Command In Dial Command In Dial Command Factory Default Setting Appendix D AT Command Summary Description UO places modem in Analog Loop Originate Mode U1 places modem in Analog Loop Answer Mode U2 places modem in Remote Digital Loopback test mode U3 places modem in Local Digital Loopback test mode VDO disables Voice Data Dialing VD1 enables Voice Data Dialing VO means Result Codes sent as digits terse response V1 means Result Codes sent as words verbose response Wait for new dial tone amp WO causes modem to store
47. 1B 27 3B 59 5B 91 7B 123 FS 1C 28 lt 3C 60 5C 92 7C 124 GS 1D 29 3D 61 5D 93 7D 125 RS 1E 30 gt 3E 62 5E 94 7E 126 US 1F 31 3F 63 E DE 95 DEL 7F 127 NUL Null or all zeros DC1 Device Control 1 SI Shift In SOH Start of Header DC2 Device Control 2 SO Shift Out STX Startof Text DC3 Device Control 3 SYN Sync ETX End of Text DC4 Device Control 4 LF Line Feed EOT End of Transmission CAN Cancel FF Form Feed ACK Acknowledge EM End of Medium ENQ Enquiry BEL Bell or Alarm SUB Substitute ESC Escape BS Backspace FS File Separator DLE Data Link Escape HT Horizontal Tab GS Group Separator NAK Negative Acknowledge VT Vertical Tab RS Record Separator CR Carriage Return ETB End Transmission Block DEL Delete 129 MultiModemBA User Guide Appendix C Dial Pulse and Tone Dial Frequencies Dial Pulses B Closed 2 Open Lal Digit 2 Digit 1 In the example above the digit 2 is pulse dialed followed by the digit 1 Each pulse consists of an A mSec open and a B mSec closed where A will be either 60 or 67 mSec and B will be either 40 or 33 mSec for a total of 100 mSec per pulse or a rate of 10 pulses per second The interdigital pause time is 800 mSec The pulse ratios are controlled by the amp P command Tone Dial Frequencies Hz 697 770 e n 130 852 941 Hz 1209 le e v E Le e l CA CA O RA N N lo s gt I wesch OD oe Co Appendix D Co
48. 232 V 24 Computer Modem or Data Flow Terminal Computer Initiated Flow Control Pacing RS 232 V 24 Computer Modem Or Data Flow Terminal Figure 5 2 Flow Control and Pacing Hardware Flow Control amp EA With Hardware Flow Control the modem uses its RS 232C interface to control the flow of data from the computer or terminal to which it is attached The CTS Clear to Send signal on Pin 5 of the RS 232C interface is brought low to stop the flow of data and is brought high to restart it When you select Hardware Flow Control as your Modem Initiated Flow Control method you will also be selecting it for Pacing The difference between the two however is that Modem Initiated Flow Control uses the Pin 5 CTS output signal while Pacing uses the Pin 4 RTS input signal Modem commands are used to select the method of flow control used by the modem when its error correction capabilities are used These commands are covered in Section 5 4 9 If neither method is selected the modem defaults to no flow control amp E3 Xon Xoff Flow Control amp E5 Xon Xoff is the most commonly used method of flow control Under this method control characters known as Xon and Xoff are inserted by the modem into the data to start and stop the flow of data from the computer or terminal to which the modem is attached Xoff which is a Control S stops the flow of data and Xon which is a Control Q restarts it With regard to Binary Data Xon Xoff flow contro
49. 2400 bps Guard tones are used in Europe and other areas for the modem to function in the telephone systems Guard tones are not used in the United States amp GO default turns off CCITT guard tones amp G1 turns on 550 Hz guard tones amp G2 turns on 1800 Hz guard tones This command is not used in international models Bell V 21 Tone B The B command selects the frequency that the modem uses for its answer tone The answer tone is the tone transmitted by a modem receiving a call to the modem that called it which initiates the handshaking between the two modems At higher speeds there is no conflict because all use CCITT frequencies At lower speeds 0 1200 bps in the U S some modems use the Bell frequency of 2225 Hz However the CCITT specification for V 22 has an answer tone frequency of 2100 Hz The ATBO command enables CCITT frequencies including V 21 300 bps and V 23 1200 75 bps The ATB1 command enables Bell frequencies including Bell 103 300 bps The modem default is ATBO Phone Line Monitoring Speaker M The modem has an internal on board speaker which functions like the speaker in a telephone handset to enable you to monitor phone line activity The M command can be used to determine when the speaker is operational Entering ATMO disables the speaker completely while ATM1 causes the speaker to be on only until a carrier signal is detected ATM2 causes the speaker to remain on at all times ATMS causes the speaker t
50. 34 mode L9 Displays Signal Strength information L10 Displays Signal to Noise Ratio information SNA L11 Displays noise information 75 MultiModemBA User Guide 76 Multi Chapter 6 S Registers Multi Te Systems MultiModemBA User Guide 6 1 78 Introduction Certain Command Mode configurations are stored in memory registers called S Registers The S command is used to assign a value to and to read the current value of an S Register To assign a value to an S Register enter the letter S followed by the S Register number and an equals sign and then a decimal response to the message ENTER THE NEW VALUE IN DECIMAL FORMAT To read an S Register value enter the letter S followed by the S Register number and a question mark then hit RETURN To verify that the S Register value was entered correctly enter for example ATS8 and hit RETURN You should receive a response of the assigned value given to that S Register Refer to Section 6 2 Reading and Assigning S Register Values SO Number of Rings Until Modem Answers Unit 1 ring Range 0 255 Default 1 Description SO defines the number of rings the modem waits before answering an incoming call The default value is one ring Decimal 1 which means that the modem answers the call immediately after the first ring The maximum number of rings that can be configured is 255 Setting the value to zero 0 disables auto answer completely S1
51. 4 Speaker Volume Control Chapter 9 DIP Switch Settings You can adjust the volume of the modem s phone line monitor speaker with a volume control knob located on the back of the modem next to the RS 232C connector see Figure 9 1 for location Turn the knob clockwise to increase the modem s volume and counterclockwise to decrease speaker volume See Speaker Control Command M in Section 5 4 6 Recording Option Configurations This section lets you record any changes you may have made to the DIP Switch settings Circle the appropriate setting and record the effect for future reference DIP Switches Switch Function 1 Force DTR DTR from Interface 2 Flow Control amp E4 amp E5 Async Dial Up Leased Line 2 SDLC BSC Sync 3 Result Codes Enable Disable Async Dial up 3 DbM Transmit 9db 0dB 15db 10dB Async Sync Lease Line 4 UUCP Enable Disable Async Dial Up Leased Line 4 AS 400 Enable Disable Sync Dial Up Leased line 5 Auto Answer Enable Disable Async Sync Dial Up 5 Answer Originate Async Sync Leased Line 6 Max Thru Enable Disable Async Dial Up Leased 6 Slave Clock Enable Disable Sync Dial Up Leased 7 RTS Normal Forced Sync Async Dial Leased 8 Command Mode Enabled Sync Async Dial Leased 9 Local Remote LoopBack Async Sync Dial Leased 10 Dial Up Leased Line 11 AT Multi Tech Result Codes Asynchronous Position Effect UP DOWN
52. 432 and 2834 Series only 146 Appendix H V 25bis Operation Appendix H V 25bis Operation Chapter 5 described a set of commands which let the modem dial hang up and be configured for various applications However these commands the AT command set are only functional when the DTE transmits data asynchronously That is they cannot be used with synchronous equipment such as that found in IBM s Binary Synchronous Communications BSC and Synchronous Data Link Control SDLC environments The ITU V 25bis commands provide you with an alternate set of commands and responses to those described in Chapter 5 for applications in which the DTE is synchronous V 25bis commands support dialing functions in asynchronous or synchronous mode according to the recommendations of the ITU however the AT commands are understood to reign in the asynchronous world while the V 25bis commands are relegated to the synchronous world of datacomm If you need to establish a datacomm link over Public Switched Telephone Network PSTN dial up services and your equipment outputs a synchronous data stream V 25bis commands are essential V 25bis mode AT commands do not include any modem configuration commands You can execute normal AT commands in V 25bis mode for modem configuration Delayed and Forbidden Numbers V 25bis provides the facility to delay failed call retry attempts by putting numbers that failed to connect on a special Delayed Number list Subsequent
53. 50 UART however is reliable to at least 115 200 bps With V 42bis data compression enabled the MT2834BA can achieve throughputs approaching 115 2K depending on line quality and file content If you presently do not have a 16550 UART in your PC we recommend that it be replaced with a Multi Tech high speed Intelligent Serial Interface ISI card It comes in one two and eight port versions for DOS Windows and UNIX systems and includes a 32 K buffer that eliminates data loss even at high speeds See your dealer for details Chapter 5 Command Mode 5 4 12 Immediate Action Commands Help Screens H The Help command is designed to give you short explanations on how to use each modem command The Help command can be quite useful if your manual is not handy and you are in the middle of a communications session Although the explanations are quite abbreviated compared to those in this manual they should prove to be helpful reminders when needed At the time of this writing we have three screens of Help information Screen 1 2 and 3 and more screens may be added in the future The Help commands are structured so that you can call up one of three Help screens as follows AT H1 Help Screen 1 AT H2 Help Screen 2 AT H3 Help Screen 3 Inquiry for Product Code Some systems or software packages automatically check the identification of the modem with which they are communicating by using the I command This read com
54. 7 and hit RETURN The modem will now match its RS 232C speed to that of the computer and will adjust its speed to any changes in the computer s speed in Originate mode or to the speed of the originating modem in Answer mode The speed at which the modem communicates over the phone line will always be the same as the speed at which it communicates via its RS 232C serial port Modem Baud Rate MB The MB command presets the modem s transmission baud rate for originate operations i e the speed of the modem s transmissions over the telephone lines when originating a call With speed conversion this transmission speed can be a different baud rate than the serial port speed When the modem receives answers a call from another modem it automatically switches its phone line transmission speed to match the calling modem However if the modem originates a call to another modem that is unable to connect at the same baud rate it automatically drops to a lower baud rate in an attempt to match the speed of that modem For example if the modem is set for 14 400 baud and calls another modem that has a top speed of 2400 baud it drops to 2400 baud The command to set the Modem Baud Rate is AT MBn where n can be 2834 Series AT MB75 CCITT V 23 AT MB300 300 bps AT MB1200 1200 bps AT MB2400 2400 bps AT MB4800 4800 bps AT MB9600 9600 bps AT MB14400 14400 bps AT MB19200 19200 bps AT MB28800 28800 bps AT MB33600 33600 bps Th
55. 85 Synchronous Transmit Clock Select amp X 55 T Telephone l Ing torinese 126 Terminal Busy Out of Service 159 Terminal Mode ann 124 Terminal Computer Initiated Pacing amp E13 68 Ne Le nues 158 WESUNG sise 124 126 165 MultiModemBA User Guide SE TEST E 124 Time Elapse for Escape Sequence 82 Time for Carrier Abort Timer 79 Tone Dialing Tone Spacing and Duration 80 Tradename enn 12 Transmission speed 28 31 RRE ul Leet E 158 Transmit Levob e ES 14 Two Wire Leased Line Connection 154 U IT Ke 28 72 WARTS iini edes 28 29 31 32 128 Mio 28 29 31 16560 en 28 29 31 127 128 E 28 31 8250A tu mine 28 29 31 EI 29 euer Le WEE 28 Unix UUCP SpOOflhg rss 110 Unix UUCP Spoofing P 55 Upgrading the MT2834BL 121 V V 25bis Mode AT Commands 149 V 25bis AT Commands hdmi 150 V25bIS Operation danois 147 V 25bis Responses Result Codes 149 V 25bis Set Up and Initialization 148 V occisis tto eee eee enn 32 V 42 Mode Select L ssusss 64 VE DIS tics PES 28 31 32 W Wait for New Dial Tone WW 51 Wait Time for Dial Tone sassnnnssnsssennnnnneeneeee 79 Wait for Carrier
56. 9 sets the time delay between when the modem first detects a valid incoming carrier signal and when the modem turns on its Carrier Detect circuit The default setting is 600 milliseconds or six units of 100 mSec each Decimal 6 S9 may be set for up to 25 5 seconds Carrier Loss Disconnect Delay Time Unit Range Default Description S11 100 mSec 0 255 7 S10 sets the time a carrier signal must be lost before the modem disconnects The default setting is 700 mSec or seven units Decimal 7 of 100 mSec Maximum delay is 25 4 seconds Decimal 254 Setting the S10 value to 255 causes the modem to not disconnect with loss of carrier This S Register applies at speeds of 2400 bps and less Tone Dialing Tone Spacing and Duration Unit Range Default Description S13 1 mSec 1 255 80 255 70 80 S11 sets the speed of tone dialing spacing and tone duration times The default value is 70 units Decimal 7 or 80 units where each unit is one mSec meaning that each tone is on for 70 mSec with a 70 mSec pause between each The minimum S11 value allowed by most telephone systems is 50 mSec 50 units Very few telephone systems can handle anything faster than that The maximum S11 value is 255 mSec 255 units Remote Configuration Escape Character Unit Range Default Description ASCII Character 0 127 37 S13 defines the remote configuration escape character which becomes your modem s remote co
57. Codes When in V 25bis mode the AT V1 command executed your modem provides you with several responses which can help you follow the progress of V 25bis operations These are similar to the Result Codes associated with AT Command mode operation The V 25bis responses are in the form of three character mnemonics as listed below INC VAL DLCt Chi LSNmm ad dd LSDmm ad dd LSFmm add dd CON ssss Incoming Call same as RING indicator A valid V 25bis command has been attempted Call delayed for t minutes number on Delayed list Call failure indicator where rr equals et Engaged tone same as BUSY nt Call Answered but No Answer Tone ab Call Not Answered fc Number on Forbidden List ns Number not stored in memory ua User Abort nd No Dialtone ff Forbidden List full Phone number in V 25bis memory Phone number on the Delay list Phone number on the forbidden list Connection at ssss speed if X1 in effect 149 MultiModemBA User Guide 150 V 25bis AT Commands The AT commands associated with V 25bis mode are described as follows Note that one command enables and disables V 25bis mode and the rest are only operable in the V 25bis mode Enable Disable V 25bis Mode V Command The function of the V command is to select the V 25bis mode in asynchronous mode Synchronous mode is set up with switches For example the modem could be in AT command mode AT V1 and if synchronous mode is enabled wit
58. Control F signals from the HP equipment will be accepted and responded to according to Hewlett Packard protocol 67 MultiModemBA User Guide 68 Normal Mode Modem Flow Control On amp E11 When two MultiModems are connected in Normal mode not using error correction Xon Xoff can be used to control the flow of data between the modems Flow Control can be turned on or off with the Normal Mode Modem Flow Control commands When the modems are connected in Reliable mode a different method of modem flow control is used and the commands for Normal Mode Modem Flow Control are ignored When you are using Speed Conversion in Normal Mode you must activate the modem s Normal Mode Modem Flow Control Speed Conversion is explained in Section 5 4 11 Terminal Computer Initiated Pacing amp E13 As mentioned earlier the modem can initiate flow control by issuing Xon Xoff commands or toggling the CTS signal on the RS 232C interface The modem can also be configured to react to similar commands and signals from the computer or terminal to which it is attached via the RS 232C interface We refer to the computer or terminal initiated flow control as Pacing When the modem is set for Pacing On the modem will respond to the terminal or computer pacing When the modem is set for Pacing Off it will ignore pacing In order for the modem to be set for Pacing On a modem initiated method of flow control must be previously selected Once this is done the mod
59. D or C is added Note these Extended Result Codes are displayed when your modem is set up to do so with an X1 X2 X3 or X4 command 47 MultiModemBA User Guide 48 Standard AT Result Codes 2834 Series TERSE JO O1 PS ND D 0 1432 Series TERSE NOR ND 932 Series TERSE O1 D VERBOSE OK CONNECT RING NO CARRIER ERROR CONNECT 1200 NO DIALTONE BUSY NO ANSWER CONNECT 2400 VERBOSE OK CONNECT RING NO CARRIER ERROR CONNECT 1200 BUSY VERBOSE OK CONNECT RING NO CARRIER ERROR CONNECT 1200 VERBOSE CONNECT 4800 CONNECT 9600 CONNECT 14400 CONNECT 19200 CONNECT 21600 CONNECT 24000 CONNECT 26400 CONNECT 28800 CONNECT 31200 CONNECT 33600 VERBOSE NO ANSWER CONNECT 2400 CONNECT 4800 CONNECT 9600 CONNECT 14400 VERBOSE NO DIAL TONE BUSY NO ANSWER CONNECT 2400 CONNECT 4800 CONNECT 9600 Reliable Compression modifiers are not displayed with Standard AT Result Codes 5 4 Chapter 5 Command Mode Dialing Commands 5 4 1 Dialing Action Commands Dial Command D The letter Din a command causes the modem to dial the telephone number immediately following it For example if you enter ATD5551212 and hit RETURN the modem dials the number 555 1212 The D command is also used in conjunction with a telephone set for manual dialing You dial the number on your telephone set and after hearing the answer tone on your handset you type ATD
60. Drive Mounds View Minnesota 55112 U S A 612 785 3500 or 800 328 9717 U S FAX 612 785 9874 Fax Back Service 612 717 5888 Technical Support 800 972 2439 BBS 612 785 3702 or 800 392 2432 Internet Address http www multitech com 161 MultiModemBA User Guide 162 Canadian Limitations Notice Notice The ringer equivalence number REN assigned to each terminal device provides an indication of the maximum number of terminals allowed to be connected to a telephone interface The termination of a interface may consist of any combination of devices subject only to the requirement that the sum of the ringer equivalence numbers of all the devices does not exceed 5 Notice The Industry Canada label identifies certificated equipment This certification means that the equipment meets certain telecommunications network protective operational and safety requirements The Industry Canada does not guarantee the equipment will operate to the user s satisfaction Before installing this equipment users should ensure that it is permissible to be connected to the facilities of the local telecommunications company The equipment must also be installed using an acceptable method of connection The customer should be aware that compliance with the above conditions may not prevent degradation of service in some situations Repairs to certified equipment should be made by an authorized Canadian maintenance facility designated by the supplier
61. EB P CONFIGURE DATA amp E14 COMPRESSION amp E15 CONFIGURE SPEED BAO CONVERSION EXECUTE IMMEDIATE ACTION COMMANDS BA1 MB SB H AT lt CR gt E A O Chapter 5 Command Mode Carrier Detect Control Data Terminal Ready Control Clear To Send Control Data Set Ready Control CTS RTS Control DSR CD Control Normal Mode Auto Reliable Mode Reliable Mode Negotiate V 42 Mode During Handshake MNP On LAPM Off LAPM On MNP Off Direct LAPM Phase Out Handshake Auto Reliable Buffering Enable Disable Auto Reliable Fallback Character Retransmit Count Error Correction at 300 bps Flow Control Disabled Hardware Flow Control Xon Xoff Modem Initiated Xon Xoff Modem Responds No Pass Through Xon Xoff Modem Responds Pass Through Allowed Send Single Multiple Xoff Characters Enq Ack Off Enq Ack On Normal Mode Modem Flow Control Off Normal Mode Modem Flow Control On Computer Initiated Off Computer Initiated On Maximum Block Size 10 11 bit Asynchronous Format Parity Selection Data Compression Disabled Data Compression Enabled Speed Conversion On Speed Conversion Off Set modem speed e g MB14400 Set serial port speed e g SB57600 Help Product Code Inquiry Windows 95 Autodetect Inquiry 2834 Series only List Current Operating Parameters List S Register Values List additional Configuration Parameters List On Line Diagnostics Off Hook Escape Sequence Entering Command Mode w
62. FY DIALING PROCEDURES MEMORIZE PHONE NUMBERS STORE MODEM CONFIGURATIONS AND DEFAULTS CONFIGURE COMMAND RESPONSES CONDITION PHONE LINE COMMANDS D Dial A or Continuous Redial D DTR Dialing VD Voice Data Dialing N Dial a Stored Number P T Pulse Tone Dialing amp P Set Pulse Dial Ratios Automatic Pauses in dialing Y Long Space Disconnect W Wait for New Dial Tone Return to Command Mode After Dial Command R Reverse Mode of Operation Flash On Hook AT amp T Calling Card Tones Quiet Answer DN Store Phone Numbers NN Number Linking L List Numbers Stored in Memory amp F Load Factory Defaults amp W Store Configuration A S Register Parameters Z Reset Modem V Result Code Terse Verbose SP UNIX Spoofing amp M Synchronous Asynchronous Mode Select amp X Synchronous Transmit Clock Select Q Result Codes Enable Disable Response amp Q Result Code Selection E Echo Command Characters V Result Code Terse Verbose X Result Code Basic Extended Call Progress amp G Guard Tones M Monitor Phone Line amp T Remote Digital Loop Signal XT Enable Disable Trellis Coded Modulation B Bell V 21 Tones F Fallback When On Line amp CD Cleardown at Disconnect 2834 Series only A Auto Speed Detect CONTROL RS232C amp C INTERFACE CONFIGURE ERROR CORRECTION CONFIGURE FLOW CONTROL amp E4 amp E7 X amp E8 amp E9 amp E10 amp E11 amp E12 amp E13 amp BS
63. Multi L BA Series Intelligent Data Fax Modem Multi Te Systems User Guide 88312000 Revision A MultiModem Models MT2834BA MT2834BAI MT1432BA MT1432BAI MT1432BA Mac MT932BA MT932BA This publication may not be reproduced in whole or in part without prior expressed written permission from Multi Tech Systems Inc All rights reserved Copyright 1999 by Multi Tech Systems Inc Multi Tech Systems Inc makes no representations or warranties with respect to the contents hereof and specifically disclaims any implied warranties of merchantability or fitness for any particular purpose Furthermore Multi Tech Systems Inc reserves the right to revise this publication and to make changes from time to time in the content hereof without obligation of Multi Tech Systems Inc to notify any person or organization of such revisions or changes Record of Revisions A 6 1 99 Manual revised Manual reformatted for electronic distribution All pages remain at Revision A Trademarks of Multi Tech Systems Inc are as follows MultiModem Multi Tech and the Multi Tech logo MNP Microcom Network Protocol is a trademark of Microcom Inc AS 400 and System3x is a trademark of IBM Macintosh is a trademark of Apple Computer Inc Unix is a trademark of X Open Co Ltd Windows and Windows 95 are registered trademarks of Microsoft All other brands and product names mentioned in this publication are trademarks or registered trademarks o
64. N Password as selected in Table 7 1 by entering ATZIxxxxxxxxxx CH xxxxxxxxxx from Table 7 1 8 Enter your modem s Setup Password as selected in Table 7 1 by entering AT Syyyyyyyyyy CR yyyyyyyyyy from Table 7 1 Table 7 3 Callback Operational Sequence Procedures Perform the following steps when dialing into a dialback modem Step Procedure 1 When called the modem answers and after a slight delay responds with Password 2 Enter your modem s LOGIN Password Table 7 1 and hit RETURN If entered correctly the modem responds with DB 3 Enter the Callback Password corresponding to the phone number you wish called back and hit RETURN Callback Passwords and phone numbers entered in Table 7 2 You can also use special characters and They must have been entered as part of the Callback phone numbers in Step 5 of Table 7 2 If you use the character along with your password the Callback modem will connect directly without hanging up and calling back If you use the character along with your password you can also enter a phone number which you wish the Callback modem to dial after hanging up The and characters must be entered after the Dial back password i e DB gt xxxxxx This is also the point where you enter an extension number if your Callback number used the feature Step 5 in Table 7 2 You have three tries at each prompt to enter the information properly with an incorrect entry resulting in a pas
65. R CD 108 2 DTE Terminal Ready 22 RI CE 125 DCE Ring Indicator 24 XTC DA 113 DTE External Transmit Clock 25 OOS CN 142 DTE Terminal Busy Pin 9 need not be present in your RS 232C cable Pins 15 and 17 are necessary only for synchronous operation Also known as DTR Data Terminal Ready The computer or terminal should be supplied with a cable terminated with a Cinch DB 25P or equivalent connector mounted in a Cinch DB 51226 1 or equivalent hood assembly as specified by the EIA RS 232C standard 156 Appendix J RS 232C Interface Specifications Functional Description of RS 232C Signals Transmitted Data Pin 2 SD BA Direction to modem Signals on this circuit are generated by the customer s terminal and transferred to the transmitter of the modem A positive signal is a space binary 0 and a negative signal is a mark binary 1 The transmitting terminal should hold this line in the marking state when no data is being transmitted including intervals between characters or words The TRANSMIT XMT LED indicates the status of this circuit Received Data Pin 3 RD BB Direction from modem The lead is the data output of the modem Data signals received from the remote modem are presented on this line When no carrier signal is being received pin 8 negative this line will be forced into a marking condition The RECEIVE RCV LED indicates the status of this signal Request To Send Pin 4 RTS CA Direction
66. Reliable fallback character F and Auto Reliable buffering A commands can be used together to cause the modem to buffer all data received up until the CARRIAGE RETURN and then drop to Normal mode All data received will then be output following the CONNECT message ATSFO0 Do not fall back to Normal if CARRIAGE RETURN received ATS F1 Fall back to Normal mode if CARRIAGE RETURN received The factory default is SEO Retransmit Count R If errors are received during a Reliable connection the modem re sends the block of data which contained an error With the RO command if another error occurs the block will be re sent again The modem counts the number of times that a data block is re sent If the same block of data is resent 12 times and still has not been received properly the modem assumes that the transmission line is unsuitable for transmission and abort the connection This retransmit counter is disabled by the R1 command When the retransmit counter is disabled the modem keeps trying to send data and will not abort no matter how many times the same block is resent AT RO Disconnect if retransmit count is exceeded AT R1 Do not disconnect due to retransmits The factory default setting is RO V 42 Error Correction 300bps E At 300 bps error correction is not typically used E1 lets the modem function at 300 bps in either Normal amp E0 Auto Reliable amp E1 or Reliable amp E2 mode E0 which is the modem
67. SEU orci ene 63 Normal Mode Modem Flow Control amp E11 68 Normal Auto Reliable Reliable Mode Commands69 Number Linking NN annees 53 Number of Rings Until Modem Answers 78 83 O Online MOJE sacrae an 43 On line Warranty Registration 118 Ordering ACCeSSOTIGS sienne tante 122 Originate MOG issues 64 Originate Answer Mode 111 P PACING de ie tee 31 P raimelers siemens dinde 29 30 31 Changing defaults 5 2 ei dotes eas 30 BID c e T 30 eebe 29 Parity Selection AP sense 68 Password Command Summary 139 Pause Time for Comma 79 PBX CBX Disconnect Drop Time for DSR CTS CD81 PBX CBX SySIOITIS immenses 81 uo 15 Power DIE st EE 124 Program V 34bis Connect Speeds 83 Program V34 Connect Speeds 83 Side ere 32 127 Pulse or Tone Dial P T 50 Q Quiet Answer 9 52 R Reading of Line Probe Information Commands 75 RECEIVE ClOCK ni aan 158 Received MP 157 Receiver Sensitivity A 15 Reliable Mode amp E2 x rine 63 Remote Configuration Character 95 Remote Configuration Escape Character 80 Remote Configuration Procedures 92 Remote System Configuration 31 Request To SN nn nuire 157 Request To Send Force 112 Result Code Summary
68. Systems MultiModemBA User Guide 4 1 4 2 36 Introduction We ll assume that yours is the very common application where you are using a modem to dial up a remote computer The modem has been factory preset for originating a call to a compatible baud modem also set up for hardware flow control V 42 error correction V 42bis data compression and CTS RTS operation If the answering modem is not set up similarly the modem automatically adjusts to the appropriate protocol Dialing On Line Answering There are several basic steps for originating and answering in data communication mode 1 Load communication software 2 Dial 3 Establish On Line connection 4 Terminate Call A simple way to dial is from the keyboard of your computer or terminal You enter a command on the keyboard to tell the modem to dial If you use a sophisticated communications software package the software tells you to enter phone numbers and other information If this is the case the software and not you gives the dialing commands to the modem All of the commands option registers and intelligent features of the modem is taken care of by the software If you are giving commands directly to your modem and not through your software each command must begin with AT ATtention Characters AT characters may be entered in upper or lower case Entering AT automatically sets the modem s speed to match the speed of the computer or terminal and also sets t
69. Test is an on line test that loops data sent from one modem across the phone line to another modem then back to the first modem See Figure 8 2 There are two ways to put a modem into Digital Loopback mode 1 Locally or Manually described here in section 8 3 2 Remotely or Automatically see section 8 4 Note The Digital Loopback Tests can only be used with the modem in Normal mode error correction off ATUS UUUUU UUUUU Digital Analog Analog Digital Computer or Terminal Local MultiModem Remote MultiModem Computer or Terminal Figure 8 2 Digital Loopback Test local manual In this test the local modem is placed in Digital Loopback mode Data is entered and transmitted from the remote modem which is not in digital loopback mode sent across the phone line to the local modem and looped back to the remote modem The test procedure is as follows 1 2 Go into Terminal mode Type AT and hit ENTER you should get an OK message Dial the remote modem by entering the Dial command and the phone number to establish On line mode Type the Escape Sequence AT lt CR gt or lt BREAK gt AT lt CR gt which brings your modem into Command mode while still maintaining the pseudo On line mode with the remote modem Type ATUS from the local PC and hit ENTER Once you receive an OK message from your modem if responses are enabled the local modem is placed in Digital Loopback mode Data is typed from the r
70. a half second For example to flash On Hook after dialing the number 555 1234 in order to transfer to Extension 5678 you might enter ATDT5551234 15678 The commas cause a 4 second pause just to be safe 51 MultiModemBA User Guide 52 Calling Card Detect Tones The modem has the capability to detect AT amp T calling card tones for the purpose of utilizing the user s calling card number to originate an on line connection An symbol placed in the dialing string causes the modem to pause and wait for an AT amp T calling card or a 1600 Hz tone prevalent in the United Kingdom When the tone is detected the rest of the dialing string is processed If no tones are detected within the time period set by S Register S7 default 45 seconds the modem will abort by indicating a NO CARRIER message Hitting any key also aborts the command The following is an example of this command ATDT 10288061278535009123456789 access phone number credit card number Quiet Answer The 2 command causes the modem to wait before processing the next symbol in the dialing string The wait is for one or more ringbacks followed by 5 seconds of silence If the time specified by S Register S7 passes before the rings and silence a NO ANSWER H result code is processed The 2 command is used for accessing a system that does not provide a dial tone For example ATDT5551212 6313550 causes the modem to dial the first number 555 1212 and wa
71. ake sure the cable is the right one for your computer Peripheral expansion cards such as bus mouse and sound cards may include a serial port pre configured as COM1 or COM2 The extra serial port or the card itself may use the same COM port memory address or interrupt request IRQ as your communications port Be sure to disable any unused ports To look for address or IRQ conflicts if you use Windows 3 1x select File Run in Program Manager type MSD and press ENTER Then select Mouse COM Ports and IRQ Status and note the addresses and IRQs that are in use If you find an IRQ conflict note which IRQs are not being used then change one of the conflicting devices to use one of the unused IRQs If you find an address conflict change the address of one of the conflicting devices To change a port address or IRQ in Windows 3 1x double click the Control Panel icon then the Ports icon Click on the port you want to change click Settings click Advanced and select the new port address and or interrupt If you wish to use COM3 or COMA note that COMS shares an IRQ with COM1 as does COM4 with COM2 so you should change their IRQs to unused ones if possible If you use Windows 95 right click on My Computer select Properties from the menu click on the Device Manager tab double click on Ports then double click on the Communications Port your modem is connected to In the port s Properties sheet click on the Resources tab to see the port
72. allback Security and Remote Configuration The and or characters entered before the phone number are optional The Deposit Number code allows a caller to enter the number he or she wishes the Callback modem to call back when the caller uses a particular password Step 3 of Table 7 3 The character enables direct entry when the caller uses that correct password Step 3 of Table 7 3 without the Callback modem having to return the call The entry at the end of the phone number is optional and indicates a subcode number to the main phone number for that location The used to dial different extensions at the same basic number To use this optional feature enter the number of marks where indicated equal to the number of digits in the desired extension number e with a 4 digit extension enter When a caller uses that particular password Step 3 of Table 7 3 he or she then enters an extension number directly after the password with the same number of digits as the number of marks originally entered When calling back that particular number your modem will also dial the indicated extension number Note To view Callback Passwords Numbers use the L Command 6 To store changed parameters to memory enter AT amp WO and hit RETURN Note If you have enabled Callback Security DB1 in step 2 of Table 7 2 the modem will be secured locally To gain local access you must again perform steps 7 and 8 7 Enter your modem s LOGI
73. allback password stored at memory location xx Memory locations are 0 to 29 Erases the callback phone number stored at memory location xx Memory locations are 0 to 29 Password Command Summary Command IXXXXXXXXXX Syyyyyyyyyy V 25bis Commands Command Vn CSPs CRNdd CRIdd nn DIC or CIC Appendix D AT Command Summary Description Login Password is any keyboard characters x upper lower case sensitive minimum 6 and maximum 10 characters The default Login Password is IMULTI TECH Setup Password is any keyboard characters y upper lower case sensitive minimum 6 and maximum 10 characters The default Setup Password is SMODEMSETUP Description VO returns modem to AT command mode when in V 25bis mode V1 enables V 25bis mode of operation V2 allows modem to receive one V 25bis command while in AT command mode without leaving AT command mode V5 DSR follows DTR in V 25bis mode V6 DSR does not follow DTR in V 25bis mode Changes the serial bps rate CSP0300 300 bps CSP1200 1200 bps CSP2400 2400 bps CSP4800 4800 bps CSP9600 9600 bps CSP19200 19200 bps CSP38400 38400 bps CSP57600 57600 bps 2834 and 1432 models only CSP115200 115200 bps 2834 models only Dials phone number dd where dd can be up to 20 characters 0 through 9 P T and Phone number is checked against the Delayed and Forbidden Number lists before dialed Dials dd same as CRN
74. and is the factory default If this is the case refer to the amp R command for control of the Clear to Send signal DSR CD Interaction Control amp SF In typical applications Data Set Ready DSR follows Carrier Detect CD amp SFO enables DSR to follow CD and is the factory default amp SF1 enables DSR to operate independent of CD If this is your application refer to the amp S command for control of the Data Set Ready signal Chapter 5 Command Mode 5 4 8 Error Correction Commands You can use AT commands to place your modem one of three V 42 error correction modes of operation These are the Normal Auto Reliable and Reliable modes Normal Mode amp EO In Normal mode of operation the modem s V 42 error correction capabilities are disabled and the modem functions as a non error correcting modem Auto Reliable Mode amp E1 In Auto Reliable mode during the handshaking procedures at the start of the on line connection the modem automatically determines whether or not the modem with which it is communicating is using V 42 error correction If the modem determines that the other modem is using V 42 it switches itself into MNP or LAPM Reliable V 42 mode and its error correction capability is enabled If it is determined that the other modem is not using V 42 the modem remains in Normal mode without error correction The default setting is Auto Reliable mode amp E1 The method the modem uses to determine if the modem i
75. and mode and is ready to accept commands from your keyboard or software The modem enters On line mode after dialing making a connection with another modem and then detecting a valid carrier signal If no carrier is detected within a certain time frame the modem abandons the call and re enters Command mode Once on line the modem exits On line mode if one of two conditions is met If the carrier is lost or intentionally dropped the modem hangs up and re enters Command mode Also if the modem recognizes the Escape sequence for which it is configured i e either the Escape characters in the serial data stream the Remote Escape characters in the modulated data stream or the Break signal the modem will exit On line mode retain the datacomm link and enter Command mode You can force the modem into On line mode without dialing by sending the ATD or ATA command to the modem COMMAND MODE Dial D or A command or incoming phone call WAIT FOR CARRIER No carrier detected Carrier detected ON LINE Carrier lost MODE Figure 5 1 Functional Modes 43 MultiModemBA User Guide 5 2 44 Summary of AT Commands A wide variety of autodial operations and modem options can be controlled when the modem is in Command Mode Remember nearly all commands begin with AT These commands are organized into several functional groups An alphabetical summary of commands is provided in Appendix D HOW TO DIAL MODI
76. as no BACKSPACE key CTRL H does the same thing The character recognized by the modem as BACKSPACE may be changed to any other ASCII character with S Register S5 If you wish to cancel an entire command that has been entered but not yet executed enter CTRL X This also clears the command buffer The effect is the same as backspacing to cancel the entire command only quicker Characters entered in a command are stored in the modem s Command Buffer memory until executed by hitting RETURN The Command Buffer s capacity is sixty characters The Attention Characters AT do not count in the sixty allowed Command characters Spaces which may be used for increased display readability may be used when entering a command but are not stored in the Command Buffer and are not counted in the sixty allowed characters Hyphens parentheses etc are not allowed If the sixty character limit is exceeded or if invalid characters are entered the Command Buffer automatically erases and an ERROR message appears You would then re enter your command within the sixty character maximum using only the allowed characters Chapter 5 Command Mode 5 1 2 Functional Modes The MultiModem can be in one of two functional states see Figure 5 1 These are Command mode and On line mode There is also an in between state Wait for Carrier where the modem is out of Command mode but not yet really On Line When the modem is initially powered up it is in Comm
77. ata communications 25 MultiModemBA User Guide 26 Multi Chapter 3 Software Configuration and Modem Basics Multi e Systems MultiModemBA User Guide 3 1 3 2 28 Introduction Chapter 2 guided you through the installation of Trio communications software If you are using a different software package there are some points you should take into consideration Since your communications software configuration is affected by the capabilities of your computer this chapter begins with a discussion of the limitations of some serial ports and how to identify them It then discusses communications configuration in general and recommends settings specifically for the MultiModem The last section of this chapter walks you through the basics of using your modem Serial Port Limitations When you configure your software you need to consider how the hardware on both ends of the connection will affect the connection Some serial ports particularly those in older PC compatible computers may limit the performance of the modem You should know if yours is one of them The limiting factor is an integrated circuit called a Universal Asynchronous Receiver Transmitter or UART All data from your modem flows through it The UARTS typically used in PC compatible computers are types 8250 8250A 16450 and 16550AFN The 8250 is unreliable above 9 600 bps and the 8250A and 16450 are unreliable above 19 200 bps If the modem sends data
78. auses in Dialing You can cause the modem to pause during the dialing sequence by entering a comma character where the pause is desired This pause lasts two seconds If a longer pause is desired more than one comma may be entered consecutively with each comma causing a two second pause You also have the option of changing the length of the pause caused by the comma from two seconds to any other value from 0 up to 255 seconds This is done by setting S Register S8 refer to Chapter 6 Each comma in a dialing command counts as one of the sixty allowed characters Long Space Disconnect Y When two modems are connected in Normal mode i e without error correction there is no polite means of requesting a disconnect A link disconnect request packet is sent under reliable connections As a result some garbage may be received when a hang up command is issued The Y1 command enables the modem to use the break signal which accomplishes the hang up as an instruction to shut off its receiver and disconnect both modems must have Y1 enabled for this feature to be effective YO factory default disables this function Wait for New Dial Tone W A Winserted in the dialing command causes the modem to wait for another dial tone and not resume dialing until another dial tone is detected It is not necessary to enter a Wat the beginning of the dialing command to wait for a modem dial tone because the modem will do that first pause automatically
79. ck OK when you are finished You are prompted to read important information Click Yes to read the Release Notes when you are finished close the release notes dialog and the Trio Setup dialog is displayed 23 MultiModemBA User Guide Complete Installation Installs all components of the program 20 2 mb of disk space is required Custom Installation Installs selected components of the program Modify Installation Used to add or remove components of the program or the complete program from your system 10 Click Complete Installation and the installation introduction is presented 11 Click Next Dialog and follow the on screen instructions to load the software Once the software has finished loading the following dialog is displayed TDY System Test Test Options oj 12 Choose Manual Selection of Modem and Ports then click Next Dialog The following dialog is displayed Manual Selection of Com Ports and Modem Types Com Port Selection lt lt COM2 De Voice Options P 13 In the Com Port Selection group select the COM port on which your modem is installed from the drop down list 14 In the Modem Type group select Class 2 Compatible from the drop down list 15 Click Next Dialog The Phone Numbers and Prefixes dialog is displayed 24 2 4 Chapter 2 Installation and Connection 16 Follow the on screen instructions and when you are finished click Next Dialog The following dialog i
80. communications software to match your computer s configuration If the modem is connected to the COM2 serial port you must tell the software you are using COM2 Another important parameter is the serial port baud rate This is the speed at which your modem communicates with your computer notthe speed at which your modem communicates with another modem When V 42bis data compression is enabled you must have a serial port baud rate four times the transmission speed of the modem to fully optimize compression So if your UART is fast enough you should set the serial port baud rate to a minimum of four times the top speed of your modem If you have an 8250 UART your most reliable serial port speed will be 9600 bps if you have an 8250A or a 16450 UART try 19 200 bps if you have a 16550 UART or equivalent a serial port setting of 115 200 bps can be set reliably 3 6 14 Configuring Software for the Remote System You must meet the requirements of the remote system for successful communications Though the modem can automatically match the speed of the other modem you must specify parameters such as type of flow control break length number of data bits number of stop bits and parity If you set these parameters incorrectly with the remote system gibberish will appear on your screen 3 6 2 Terminal Emulation If you are accessing the remote computer as if from an on site terminal the keyboard codes used by your computer may not match the ones u
81. compress a compressed file but MNP 5 will The command to disable compression is AT amp E14 CR If you have an older UART or if you use your modem mostly for downloading long compressed files from BBSs you may want to include the amp E14 command in your initialization string as follows AT amp F S0 0 X4 amp E14 M As a general rule you should try to transmit files in already compressed form rather than relying on V 42bis hardware compression Because software compression is more efficient than hardware compression you will have a higher throughput with the former Of course this efficiency does not include the time spent compressing and decompressing ZIP or SIT files but it will save on phone bills And hardware compression will still be there for those occasions when it is inconvenient to compress a file with software Note also that when you download files with compression disabled you can use a slower serial port if you have an older UART 3 7 1 Disabling Error Correction By default the modem is set to auto reliable mode In this mode the modem determines during the handshake whether the other modem is using V 42 error correction If it is the modem then switches itself to reliable mode and enables error correction If it is not the modem remains in non error correction mode Normally we recommend that you leave the modem set to auto reliable mode amp E1 However you may encounter some circumstances in which the modem
82. covered in this procedure If you encounter problems during installation refer to the Release Notes included on the Trio CD 1 Turn on your computer and insert the Trio CD into your CD ROM drive If you have autorun enabled the Trio welcome screen will appear If autorun is disabled you can start the installation program by clicking double clicking Setup16 or Setup32 from the root directory of the Trio CD Click the Next gt icon to proceed with the default language English or select the desired language and click Next to proceed Click Next to proceed with the default country United States or select the country in which you are installing and click Next to proceed The Trio Welcome screen is displayed Note If you have a sound card installed on your computer and wish to turn off the music portion of the Trio CD you can click the Speaker ei icon to turn the sound off Click Speaker again to turn it back on Click Next The following dialog is displayed Tri Make it simple MultiTech Trio The Store 5 Click Trio to continue The following dialog box is displayed Make It simple Install Trio www trio com Click Install Trio to continue The Select Language dialog is displayed Click OK to proceed with the default language English or select the desired language from the drop down list and click OK The License Agreement dialog is displayed Read the license agreement and cli
83. d 3 on the RS 232 Interface EIA RS232C G VOLUME Figure 8 4A Back to Back Test Cabling Entered characters should echo back to the sending modem Back to Back Cable Local Remote Modem Modem in Loopback Mode Figure 8 4B Back to Back Testing 8 6 8 7 Chapter 8 Modem Testing Synchronous Mode Testing The following tests must be run with your modem in Synchronous mode DIP Switch 12 in the Up OPEN position DIP Switch 9 controls the modem s Synchronous mode testing function Refer to Chapter 9 for DIP Switch information The test procedures for Synchronous mode are different from those for Asynchronous mode In Synchronous mode you cannot access the modem s AT commands With DIP Switch 9 you can perform either the Digital Loopback Test remote automatic or the Digital Loopback Test local manual in Synchronous mode as described in the following sections There is also a Local Analog Loopback Test documented in section 8 7 Local Analog Loopback Test Synchronous Mode This test diagnoses the connection between your modem and your computer or terminal In Local Analog Loopback Test mode data entered at the local computer or terminal are sent through the local modem s transmit and receive circuits much like entering an ATU or ATU1 command in Asynchronous mode You then compare the test characters multiple upper case U characters in Figure 8 5 on your monitor wi
84. d characters and hit RETURN Callback Security Remote Configuration Command Summary Command DBn CBNyyxxxxxx Dxxxxxx Nxx Pn RCBNxx RDNxx 138 Description DB0 disables Callback Security and answering Yes to the prompt turns off Callback Security and erases stored phone numbers and passwords Answering No to the prompt aborts the command DB1 activates remote and local password security DB2 activates remote password security Callback password with xxxxxx being callback password and yy being the memory location Callback password xxxxxx must start with a non numeric character and upper lower case sensitive Callback password xxxxxx must be a minimum of 6 and maximum of 10 characters yy memory locations are from 0 to 29 Must specify P pulse or T tone dialing in string Callback Phone Numbers xxxxxx with the preceding the phone number indicating the callback modem phone number for the corresponding password at the same memory location The preceding the phone number enables direct entry when the caller uses the correct password without the callback modem having to return the call The entry at the end of the phone number represents an extension added to the main phone number The Nxx is the memory location of the callback phone number and password Parity of the prompt messages sent by the callback modem amp PO is no parity P1 is odd parity P2 is even parity Erases the c
85. d of the AT command set except that the number is first checked against the Delayed Number and Forbidden Number list If permitted depending on the country regulations in effect the number will then be dialed For example if you enter CRN7859875 and hit RETURN your modem will check the two lists If the number is on the Delayed Numbers list you can dial that number again after t minutes have passed If the number is on the Forbidden list a CFIFC message will be displayed You can use various commands from the AT command set within the CRN command line to facilitate the dialing process such as P T or for pulse dialing tone dialing and wait for dial tone V 25bis supports smart dialing To dial a phone number enter CRNad dd where dd dd is the phone number which can be up to 20 characters long using any character on the telephone pad 0 through 9 P T and Some additional dialing characters may be available based on country regulations Appendix H V 25bis Operation Listing Delayed Phone Numbers RLD Command When a phone number is dialed by a CRN command and a connection is not made the number is entered in the modem s V 25bis Delayed Number list along with the number of retry attempts Any further dialing attempts will be delayed some amount of time determined by the regulations of each country While the delay is in progress the modem will give a DLC indication The list contains eight numbers When filled t
86. d remote configuration or dialing i e no AT commands can be sent until the LOGIN and SETUP passwords have been entered Inactivity Timer Unit Range Default Description 32 1 min 0 255 0 S30 causes the modem to disconnect if no data is transmitted or received for a specified time This timer runs during both Reliable and Normal error correction connections The timer restarts any time a data character is passed through the serial port either sent or received If noise on the phone line causes an error to be received during Normal mode this also restarts the timer The default value is off 0 The inactivity timer is disabled by setting S30 to 0 which is the factory default setting Time Elapse for Escape Sequence Unit Range Default Description 1 second 0 255 20 S32 sets the time period to validate the escape sequence If the time interval expires before the escape sequence is employed by hitting RETURN the escape sequence is aborted The default is 20 units S34 Chapter 6 S Registers Buffer Length of Command Mode After On line Escape Sequence Unit Range Default Description S36 ASCII Character 0 60 10 If the number of characters after AT exceeds the S34 buffer length value the buffer is cleared and the escape sequence is aborted Time Between DTR Inactive and Modem Off Hook Unit Range Default Description S37 1 Second 0 255 seconds 0 The DTR Busy
87. e factory default is 33600 bps 1432 Series AT MB75 AT MB300 AT MB1200 AT MB2400 AT MB4800 AT MB9600 AT MB14400 CCITT V 23 300 bps 1200 bps 2400 bps 4800 bps 9600 bps 14400 bps The factory default is 14400 bps 932 Series AT MB75 AT MB300 AT MB1200 AT MB2400 AT MB4800 AT MB9600 CCITT V 23 300 bps 1200 bps 2400 bps 4800 bps 9600 bps The factory default is 9600 bps Chapter 5 Command Mode 71 MultiModemBA User Guide 72 Serial Port Baud Rate SB The SB command presets the speed of the modem s serial RS 232C port in both Originate and Answer modes Speed conversion allows you to set this serial port baud rate at a fixed speed of up to 115 200 bps for 1932 and 2834 models and 57600 bps for 1432 models regardless of the modem s transmission speed setting In order for this command to be effective the modem s Speed Conversion feature must first be turned off with the BA command When Baud Adjust is on the modem automatically adjusts its serial port baud rate to match the speed of the computer or terminal it is connected to as soon as it receives its first AT command However in many applications such as automatic answer the modem may not receive AT commands in which case it is very useful to be able to preset the serial port baud rate with this SB command In addition to setting the modem s serial port speed this command also sets the speed at which the modem issues Command mode respons
88. e of this LED matches that of the RD circuit on Pin 3 of the RS 232C V 24 interface CD Carrier Detect This LED is lit when a valid carrier tone has been detected 2834 Models Only When the modem is connected at 33 600 bps the 28 8 LED rapidly blinks at approximately 5 blinks per second When the modem is connected at 31 200 bps the 28 8 LED blinks slowly at approximately 1 blink per second 28 8 28 800 bps 2834 models only This LED is lit when the modem is connected at 28 800 bps Note if the modem falls back to 26 4K bps while in V 34 mode both the 28 8 and 24 0 LEDs light 1 8 Chapter 1 Introduction and Description 24 0 24 000 bps 2834 models only This LED is lit when the modem is connected at 24 000 bps Note if the modem falls back to 21 6K bps while in V 34 mode both the 24 0 and 19 2 LEDs light 19 2 19 200 bps 2834 models only This LED is lit when the modem is connected at 19 200 bps 14 4 14 400 bps 2834 and 1432 models only This LED is lit when the modem is connected at 14 400 bps Note if the modem falls back to 12 000 bps while in V 32bis mode both the 14 4 and 96 LEDs light 96 9600 bps This LED is lit when the modem is connected at 9600 bps 48 4800 bps 1432 and 932 models only This LED is lit when the modem is connected at 4800 bps 24 2400 bps This LED is lit when the modem is connected at 2400 bps 12 1200 bps 1432 and 932 models only This LED is lit when the mod
89. e site at a predetermined number Remote Configuration permits you to assist users at remote sites saving you the time and trouble of site visits and preventing misinterpretation of configuration instructions 1 3 1 2834 Series Features Your MT2834BA modem meets the proposed Enhanced V 34 ITU standard for data signalling rates as high as 33 6 31 2K bps in full duplex mode Enhanced V 34 is an extension of V 32 V 32bis V34 standards and supports and is compatible with those features including EIA extended Automode adaptive line probing automatic symbol rate and carrier frequency during start up and retrain and rate renegotiation in 2400 bps increments The MT2834BA features ITU V 25bis standard for synchronous dialing ITU V 42 error correction and V 42bis data compression providing 100 error free data transmission V 42 error correction incorporates MNP Classes 3 and 4 and LAP M You may select V 42bis data compression for 4 1 throughput or MNP Class 5 for 2 1 throughput 1 3 2 1432 Series Features Your MT1432BA modem is designed according to the international CCITT V 32bis specification for data signalling rates as high as 14 4K bps in full duplex mode The MT1432BA is AT command set compatible and incorporates a number of capabilities beyond the basics of V 32bis operation Other capabilities include CCITT V 25bis synchronous dialing compatibility with CCITT V 42 error correction and V 42bis data compression in which data comm
90. e the modem answer after five or six rings which gives you time to answer it manually if you wish See Chapter 6 for S Register information 37 MultiModemBA User Guide 4 5 4 6 38 Manual Answering We have shown that the modem can automatically answer incoming calls The MultiModem can also answer manually under your control The most typical application involves you and another person who after carrying on a voice conversatOion want to convert to data communications between your modems without having to hang up and dial again The problem here is that both modems are in originate mode For two modems to communicate one of them must be in originate mode and the other must be in answer mode The solution here is to force either one of the two modems to Answer mode and the other to Originate mode The modem can be forced into either Answer mode or Originate mode by using the Voice Data Switch on the front of the modem In our example let s say that you and your friend Bill have just had a voice conversation Both of you have your telephones connected to your modems and your modems are connected to computers or terminals Set the speed switches to the proper speed on both modems To switch to Data mode from Voice mode you would switch the Voice Data switch Down to the Originate position and Bill would switch his up to Answer This switches your modem to the originate on line mode and Bill s to the Answer on line mode Yo
91. eased Line Dial Up Operation 112 Limited Warranty sessesssees 15 118 Line Feed Character 79 LINK REQUEST sine nie 63 Listing Current Operating Parameters L5 L7 73 Listing Delayed Phone Numbers RLD Command 151 Listing Forbidden Phone Number RLF Command 151 Listing Numbers Stored in Memory L 53 Listing On Line Diagnostics L8 74 Listing S Register Values L6 73 Loading Factory Defaults amp F 54 Local Analog Loopback Test 98 Local Inactivity Timer hs 95 Long Space Disconnect Y 51 Losmg Data sarina 128 M MAG GADIS iioii niaan 155 Macintosh computer 28 31 Maximum Throughput Setting 111 Memory Nonvolatile NVRAM osen 30 MNP item 32 127 Modell NUImbGers sius conoci teretes 12 Modem Baud Rate MB 70 Modem Cannot Connect When Answering 127 Modem Dials But Cannot Make a Connection 126 Modem Disconnects While Online 127 Modem Does Not Respond to Commands 124 Modem Reset Z sistema 54 Modem Initiated Flow Control Commands 69 leet ue EE 13 MSBUEXE eege 28 MT1432BL Connections ecserin 22 MT2834BL Cables 154 N noise information ssssssenesseennnneeeennr rannen eeen 75 Normal Mode
92. ech Support 10 5 2 Upgrading the MultiModem The MultiModem has a Flash PROM which contains firmware code for the hardware and DSP code for the digital signal processor chips At various times Multi Tech may add enhancements and or fixes to the firmware The flash technology used in the MultiModem lets you load these upgrades into the PROM or DSP chips through the modems serial port 10 5 3 Using FlashPro to Upgrade Modem Firmware Download FLASHPRO ZIP and a new HEX file from the Multi Tech BBS Unzip the FLASHPRO ZIP file Place this unzipped file and the HEX file in the same directory Run FlashPro by typing FLASHPRO a space M and hitting ENTER at the DOS prompt Highlight the Configure option in the MAIN MENU and hit ENTER Highlight Active Port and select the COM port to which you have your modem attached Highlight Baud Rate and select the rate you want to program at Hit ESC when finished 5 Highlight the Select File to Program option in the MAIN MENU Highlight the HEX file Hit ESC when finished 5 D gt 6 Highlight Program Firmware option in the MAIN MENU When you are prompted to confirm the file to program press Y 7 lf you need more assistance programming FLASHPRO then contact our tech support department About Multi Tech s Internet Presence Multi Tech s presence includes a Web site at http www multitech com and an ftp site at ftp ftp multitech com About the Multi Tech Fax Back Serv
93. ed i e if you change your terminal speed while entering an AT command you will get no responses In synchronous mode the modem supplies the clock so the synchronous terminal knows the speed You must be in V 25bis mode for the commands described here to function Most AT commands will also function except those associated with dialing such as ATD ATN ATO and ATU To get into V 25bis mode you type AT V1 At this point your modem does no more speed or parity detection things associated with asynchronous operation To get out of V 25bis mode and back into AT command mode enter AT VO The AT V2 command allows you to run one V 25bis command from AT command mode without leaving AT command mode There is no command to select between asynchronous and synchronous V 25bis operation The position of DIP Switch 12 selects between modes For synchronous mode DIP Switch 12 must be UP and the AT command mode enabled 147 MultiModemBA User Guide 148 Another asynchronous mode concern is the problem of connecting at a different speed than the speed at which the serial port is set If your modem port speed is different from the serial port speed you must either 1 Enable speed conversion and have flow control on or 2 Enable connect responses with the ATX1 command and change the serial baud rate after receiving a connect message If the VD1 command is entered when in Auto Answer mode the modem answers immediately upon rec
94. ed Conversion Commands Speed conversion is a necessary part of data compression since data must be presented to the modem faster than it can handle data if data compression is to be effective Speed conversion allows the modem to communicate at one speed over the phone line and at another speed at the RS 232C interface The speed also referred to as data rate or baud rate can be fixed at the RS 232 interface independently of the baud rate of the on line transmissions In addition to data compression another popular application for speed conversion involves an auto answer MultiModem connected to a computer that does not have autobaud capability This means that the computer must be set at a fixed baud rate regardless of the baud rate that the modem is communicating over the phone line at In this application speed conversion allows the modem to match its speed to that of the calling modem while at the same time communicating with the attached computer through its RS 232C port at a fixed baud rate which can be pre selected at 300 1200 2400 4800 9600 19 200 38 400 57 600 or 115 200 bps 1932 and 2834 models only 2834 models only Speed Conversion BA When using speed conversion you must set the modem so that it does not adjust its speed at the RS 232C serial port even if the modem does adjust its data rate To turn Speed Conversion ON enter the command AT BAO and hit RETURN To turn Speed Conversion OFF enter AT BA
95. eed conversion you may want to set RTS to function independently of CTS DIP Switch 7 UP For most applications especially asynchronous this switch should be set so that RTS is forced On DIP Switch 7 DOWN RTS functions Normally Switch 7 UP RTS forced On Switch 7 DOWN Factory Default Setting B DOWN Switch 8 Enable Disable Command Mode Com Asynchronous Synchronous Mode Leased Dial Up In some applications you may want to disable the modem s Command mode so that the modem does not recognize or react to AT or V 25bis commands This may be true in strictly auto answer applications where no call origination is required Place DIP Switch 8 in the DOWN position to enable Command mode Place DIP Switch 8 in the UP position to disable Command mode The factory default setting is Command mode enabled Disable Command Mode Switch 8 UP Enable Command Mode Switch 8 DOWN Factory Default Setting DOWN Switch 9 Digital Loopback Test Asynchronous Synchronous Mode Leased Line Dial Up When in Synchronous mode this switch controls both Local Digital Loop and Remote Digital Loop tests while on line When the Voice Data switch is toggled to the Answer mode position UP and DIP Switch 9 is in the UP position the modem performs the Local Digital Loopback test When DIP Switch 9 is DOWN and the Voice Data switch is toggled to Answer mode position UP the modem performs the Remote Digital Loopback test Local Digital Loo
96. eives a high DTR signal DTR must remain high for the duration of the call until disconnect To deactivate DTR dialing enter AT DO and hit RETURN Note when using DTR Dialing in a synchronous application be sure DIP Switch 8 is in the UP position to disable V 25bis Command mode Voice Data Dialing VD Another alternate method of causing the modem to automatically dial is Voice Data Dialing With Voice Data Dialing the modem automatically dials the phone number stored in the N1 position of memory whenever the Voice Data switch is toggled You must first enter AT VD1 amp WO CR This command string enables Voice Data dialing when the Voice Data toggle switch is activated To disable Voice Data Dialing default enter the command AT VDO WO CR 5 4 2 Dial Modifier Commands There are several command characters that can be included within a dialing command following the letter D called Dial Modifiers They have various functions including the selection of Pulse or Tone Dialing pauses in the dial sequence automatic re dials if a number is busy and reverting to the Command mode or switching to the Answer mode after dialing Pulse or Tone Dial P T The modem dials numbers using either pulse or tone dialing or a combination of both methods Pulse dialing is a method used by rotary dial telephones which involves the timed opening and closing of line relay Tone dialing is the method used by push button touch tone telephones
97. eiving the first ring There is no disconnect message NO CARRIER if a normal connection is made V 25bis Set Up and Initialization Before you operate your modem in the V 25bis mode you need to make sure it is set up properly various RS 232 lines such as DSR and CTS act as specified in the V 25bis standard Setup involves proper DIP Switch settings and soft switches software controlled conditions V 25bis DIP Switches 1 Unforced DTR 2 NA 3 NA 4 NA 9 Auto Answer enabled 6 Async Max throughput set Sync Slave Clocking unforced 8 Command Mode forced 9 Digital Loopback Off 10 Dial Up 11 Async AT Multi Tech Resp 12 Async Sync mode set per requirements Appendix H V 25bis Operation V 25bis Mode AT Commands The following commands will either alter standard V 25bis behavior so you must be careful in their use or they are not allowed as indicated All other commands can be used in V 25bis operation z xzcuvozzemgooremrm z AT lt CR gt Not Allowed Not Allowed Not Allowed Not Allowed Not Allowed Alters Operation D1 in V25bis is direct call mode Alters Operation Alters Operation removes modem from asynchronous V 42bis mode Not Allowed Not Allowed Not Allowed Not Allowed Not Allowed Not Allowed Not Allowed Alters Operation X0 no connect message X1 connect message Not Allowed Not Allowed Not Allowed Not Allowed Not Allowed V 25bis Responses Result
98. em is connected at 1200 bps 3 300 bps 932 models only This LED is lit when the modem is connected at 300 bps OH Off Hook This LED is lit when the phone line is off hook This occurs when the modem is dialing on line or answering a call This LED also flashes when the modem is pulse dialing in Command mode TR Terminal Ready When the TR LED is lit the modem is permitted to answer an incoming call When it goes off a connected modem will disconnect The state of the TR LED matches that of the DTR circuit on Pin 20 of the RS 232C V 24 interface EC Error Correction This LED is lit when the modem is set for V 42 error correction and flashes on and off when data compression is activated FX FAX This LED is lit when the modem is connected in FAX mode Controls on PC Board The MultiModem is designed on a single printed circuit PC board This board contains one 16 position DIP Switch numbered 1 16 The DIP Switches are accessible through a cut out on the side of the modem There is also a knob which is used to adjust the speaker volume This knob is accessible through the modem s rear panel The sixteen DIP Switches control various modem options or set default values for Command Mode operation There is a difference in how several of the switches operate depending on whether you are in synchronous or asynchronous mode Refer to the switch label on the bottom of the modem for an exact list of the switch functions in async
99. em will respond to either Xon Xoff commands or to the toggling of the RTS Request to Send signal on Pin 4 of the RS 232C interface depending on what you selected earlier as your Modem Initiated Flow Control method Maximum Block Size amp BS The maximum size of Reliable mode data blocks can be controlled with the amp BS command MNP 3 sends blocks of 1 to 64 characters MNP 4 and 5 typically send blocks of 1 to 256 characters and LAP M typically send 128 characters For MNP Classes 4 and 5 LAP M reducing the block size to 64 characters may give a smoother flow of data and better throughput on noisy phone lines Using smaller block sizes over good phone lines may cause a slight loss in throughput speed AT amp BSO0 Maximum transmit block size of 64 characters AT amp BS1 Maximum transmit block size of 128 characters LAP M 256 characters MNP The factory default setting is amp BS1 Parity Selection P The P command enables the setting of parity ATZPO selects no parity AT P1 selects odd parity AT P2 selects even parity and is the default value Note when setting up your data comm software it is critical that both your remote and local system s parity selection be set identically AT P0 no parity AT P1 odd parity AT P2 even parity The factory default setting is ATZP2 Chapter 5 Command Mode 5 4 10 Compression Error Correction Flow Control Pass Through and Pacing Commands The modem has a variety of commands
100. emote keyboard For this test typing multiple upper case U characters is a good way to send an alternating test pattern of ones and zeros The data received by the local modem will enter its analog receiver be converted to digital data be reconverted into analog and then looped through its transmitter back to the remote modem Your modem passes this test if the data entered from the remote keyboard is the same as the data received on the remote monitor When testing is complete you may end the test by typing an Escape Sequence AT lt CR gt or BREAK AT CH to bring your modem into Command mode The modem should respond with an OK message If you wish to stay On line with the remote modem for normal data transmission type ATO and hit ENTER If you wish to terminate the call type ATH and hit ENTER to hang up 8 4 Chapter 8 Modem Testing Digital Loopback Test V 54 Loop 2 Remote Automatic In this test your modem must be On line with another modem set up to respond to a request for Digital Loopback such as another MultiModem With the MultiModem this ability to respond is controlled by the amp T command AT amp T4 enables the response to Digital Loopback Test remote automatic AT amp T5 disables the response The modem defaults to disable on power up so this must be changed on the remote modem before the modem will respond to a request for the Digital Loopback Test remote automatic Initiate the Digital Loopback Test
101. empt of 28 8K lower speeds are still enabled Appendix G Result Code Summary TERSE Digit VERBOSE Words 0 o N Oo 12 13 19 21 23 24 26 28 31 33 2834 Series only OK CONNECT RING NO CARRIER ERROR CONNECT 1200 NO DIAL TONE BUSY NO ANSWER CONNECT 2400 CONNECT 4800 CONNECT 9600 CONNECT 14400 CONNECT 19200 CONNECT 21600 CONNECT 1275 CONNECT 24000 CONNECT 26400 CONNECT 28800 CONNECT 31200 CONNECT 33600 1432 and 2834 Series only Appendix G Result Code Summary Effect Command was executed without error ready for next command Modem has detected carrier and gone on line Modem has detected ring caused by incoming call No carrier signal has been detected within allowed time Error in Command line too many or invalid characters Modem has detected carrier at 1200 bps and gone on line No dial tone has been detected A busy signal has been detected Remote system did not answer Modem has detected carrier at 2400 bps and gone on line Modem has detected carrier at 4800 bps and gone on line Modem has detected carrier at 9600 bps and gone on line Modem has detected carrier at 14400 bps and gone on line Modem has detected carrier at 19200 bps and gone on line Modem has detected carrier at 21600 bps and gone on line Modem is connected in V 23 mode Modem has detected carrier at 24000 bps and g
102. er 30 would appear as 030 and the number 255 would appear as 255 To assign a value to an S Register enter the letter S followed by the S Register number and an equals sign and then a decimal response to the message ENTER THE NEW VALUE IN DECIMAL FORMAT Convert all ASCII characters to their decimal equivalents before entering them S Register decimal values range from 0 127 for ASCII characters or 0 255 for numeric values A complete ASCII conversion chart is located in Appendix B of this manual 6 2 1 Examples of Assigning Values 1 Let s say you wish to have longer pauses caused by the comma in a dial command five seconds instead of two Entering ATS8 5 assigns 5 as the value for S Register S8 meaning the modem pauses five seconds for a comma in a dial command 2 In a second example let s say that you wish to configure the modem to answer incoming calls after the 30th ring instead of after the first ring To configure S Register SO with a value of 30 enter ATS0 30 and hit RETURN 3 Inathird example let s say you are calling long distance to another country code and it is taking a long time to connect The S Register S7 Abort Timer setting of 45 seconds is insufficient The abort timer times out and cancels the call before a connection is made To change the S7 value to 55 seconds enter Command mode then enter ATS7 55 and hit RETURN Now after dialing the modem allows 10 more seconds for a carrier signal before abortin
103. er ATL and hit RETURN to display these numbers on your video screen or printer An example of an L command listing is shown below DT14082345678 DT16125551212 DP9 T14089876543 DT3738315 12101 16126313550 DT6313551R DP9 4258513 DTXA amp E1 amp E5 amp E13 amp E15DT16126313550 DT12138880123 NN O O ND x 53 MultiModemBA User Guide 54 5 4 4 Configuration and Default Storage Commands Store Configuration amp S Register Parameters in Non Volatile Memory amp W The modem can store configuration parameters and S Register values in its nonvolatile read write Random Access Memory RAM memory The amp W command does this which prevents any re configuration from being lost on a power down or Reset ATZ condition amp WO0 or AT amp W causes the modem to store your customized AT command settings and S Register values in its nonvolatile RAM amp WO also sets the modem so that it reads your customized settings stored in nonvolatile RAM when powered down or reset The amp W0 command only changes the settings stored in nonvolatile RAM that you specifically intend to alter All other default parameters are applicable amp W1 causes the modem notto store your customized settings to nonvolatile RAM so that after powering down or resetting the modem it reads the factory default settings stored in ROM Loading Factory Defaults amp F The amp F command provides a choice between customized configuration settings i
104. erCom is available as CYBERC ZIP on CompuServe in the IBM Communications Forum Library 0 CyberCom will enable Windows communications at speeds up to 115 200 bps if you have a 16550 UART installed Configuring Your Software Communications software must be configured to work with your modem your computer and the remote system it is calling Fortunately most communications programs make the process easy by providing a default initialization string tor your modem as well as defaults for most of the other required parameters 3 39 1 Configuring Software for Your Modem Because remote computers may have different connection requirements such as speed number of bits parity log on sequences etc communications software is typically configured by sessions each session having a unique configuration for a given connection e g to a BBS or commercial on line service Most communications programs however have a separate modem configuration menu because modem configurations rarely change from session to session The most important configuration is the modem initialization string This is a sequence of commands the software uses to configure the modem when the communications software is loaded or when a session begins Always begin the initialization string with the ATtention command AT then follow it with the modem reset command amp F Issuing a reset command before other commands ensures that you are starting with a known state The rest o
105. ersion Please note the status of your modem before calling tech support This status can include LED indicators screen messages diagnostic test results problems with a specific application etc Use the space below to note modem status Service If your tech support specialist decides that service is required modems may be sent freight prepaid to our factory Return shipping charges will be paid by Multi Tech Systems within North America Include the following with your modem e a description of the problem e return billing and return shipping addresses contact name and phone number e check or purchase order number for payment if the modem is out of warranty The standard repair charge for this modem is 95 This price is valid at the time of this publication but could change in the future Check with your technical support specialist if possible note the name of the technical support specialist with whom you spoke If you need to inquire about the status of the returned product be prepared to provide the serial number of the product sent see Section 10 3 1 Send modems to this address MULTI TECH SYSTEMS INC 2205 WOODALE DRIVE MOUNDS VIEW MINNESOTA 55112 ATTN SERVICE OR REPAIRS 119 MultiModemBA User Guide 10 5 The Multi Tech BBS For customers who do not have Internet access Multi Tech maintains a bulletin board system BBS that mirrors its FTP site Information available from the BBS includes
106. es The modem will accept AT commands at any speed regardless of the speed preset by the SB command If the modem receives such a command at a speed that is different than the preset speed the modem switches its serial port baud rate to match the new AT command speed although the baud rate value stored by the SB command remains the same This provides you with a convenient way to switch the serial port speed and still make it easy to go back to the original speed automatically the next time the modem is powered up or reset with an ATZ command The command to set the Serial Port Baud Rate is AT SBn where n can be AT SB300 300 bps AT SB1200 1200 bps AT SB2400 2400 bps AT SB4800 4800 bps AT SB9600 9600 bps AT SB19200 19 200 bps AT SB38400 38 400 bps AT SB57600 57 600 bps AT SB115200 115 200 bps The factory default is for 2834 and 1432 models is 57 600 bps The factory default for 932 models is 38 400 bps 1432 and 2834 Series only 2834 Series only Note Some serial ports particularly those in older PC compatible computers may limit the performance of a higher speed modem like the MultiModem see Chapter 3 The limiting factor is a circuit called a Universal Asynchronous Receiver Transmitter or UART All data from your modem flows through it 8250 16450 and 16550 are UARTS typically used in PC compatible computers The 8250 is unreliable above 9 600 bps and the 16450 is unreliable above 19 200 bps The 165
107. esssessssssssseeeeeernn 43 lE 118 On line Registration 118 Weight EE 15 WINdOWS Sen anne 29 127 128 Serial port driver msn 29 serial port driver sesssssse 127 128 Windows 95 Autodetect Inquiry Command 19 73 Windows 95 HyperTerminal 127 X MOC IDE REEL TE 127 XON XOF EE 31 Xon Xoff Flow Control amp E5 66 Xon Xoff Pass Through amp E7 67 Xon Xoff Pass Through Commands 69 Y WIMOGGIN Gi E E 127 166 Z ZIP files Zmodem
108. f information according to your connection needs and your datacomm software s conventions the software then simplifies your dialing because you needn t re configure your modem nor run the risk of mistakenly keying in incorrect information Either way you need to understand that an AT command is the method by which your modem is controlled and must therefore prefix nearly all commands AT stands for attention and alerts the modem that a command follows You may enter these commands with either upper or lowercase characters Entering AT automatically sets the modem s serial baud rate to match your computer s and also sets the modem s parity It also clears the modem s command buffer Once you re in terminal mode enter AT followed by CR to check whether your modem is operational If everything s fine your modem will respond OK Note refer to Chapter 4 for additional details on Dialing Automatic Answering Dial Back Up and Automatic Leased Line Restoral 3 8 1 Simple Operations You can dial a number by using the ATD command and the phone number of the modem with which you wish to connect e g ATD6127853500 Your modem will dial the number and hear a scrambling noise as the modem negotiates the kind of connection it can make and once the modems have settled on a common connection you will receive a connect message on your computer s video display As the modem dials and connects you may notice changes across its front LED panel
109. f the commands in the initialization string depend on the capabilities of the modem and what you want it to do Some older communications programs require you to create the initialization string by yourself Most modern communications programs however provide you with a ready made initialization string that is automatically selected when you choose your modem model from a list It is a poor idea to use an initialization string intended for another modem especially one from another manufacturer because modem capabilities and command implementations vary from modem to modem However if your MultiModem does not appear on a modem list you may use the MultiModemll initialization string 29 MultiModemBA User Guide 3 4 30 PC Initialization Strings We recommend the following initialization string for a MultiModem connected to a PC compatible computer when sharing a line with a telephone AT amp F X4 S0z0 M This string resets the modem to the factory default settings selects extended result codes with NO DIAL TONE and BUSY and turns off auto answer M must end every string sent to the modem from software It is the ASCII code for the RETURN key on most keyboards and the default code for the carriage return character in the modem and most communications programs The carriage return character is defined in the modem in S register S3 if you change it you must also change the carriage return character code used in your communications sof
110. f their respective companies Multi Tech Systems Inc 2205 Woodale Drive Mounds View Minnesota 55112 U S A 612 785 3500 or 800 328 9717 U S FAX 612 785 9874 Fax Back Service 612 717 5888 Technical Support 800 972 2439 BBS 612 785 3702 or 800 392 2432 Internet Address http www multitech com Technical Writer brian multitech com Contents Chapter 1 Introduction and Description 1 1 ug reel tee EE 1 2 How TO Use This WAMU El sociari rto oe E erre NIEEbE Qe EE encor COE TRUE 1 9 Mogdemil eallll8 iiie devra buc dtr ecd tr ER Ee Pica esa a A ares RE Iu dicere ada e aed Tidal 2834 Seres Features iiic dites EENEG EE 1 32 1432 Series FCAPS sa iiisicccccsiniesaivadessvaiaseacatassasabadeestvavendidedasavededaaddaaasinaossadadensrrdaseds inastebsawaies VC 932 Senes Features vasi i a ch Ed uei teste d E caine cR rev TE bere n le e es D Prope em pde 1 4 Fax reali BS EE 1 5 RE le Te Ee ee EE 1 6 PONS TUTTI UU ee 127 Modem LED eil e 1 8 L el tee NEE dame led contu a seat de ion ii Chapter 2 Installation and Connection 2 1 Whatisin Your Modem Package eiat RED 2 2 ue te WEE ZEA E El ne EE 22 2 nstallquonm El eet E 2 3 Loading Tho DataFAX EE 2 4 Is Your Modem Ready for Use iii Chapter 3 Software Configuration and Modem Basics 3 1 LC DCS CET ER 3 2 SernalPornt Biere S25 How Can You Identify Your VART KEE 322 The 16550 Eileen EE 3 3 COnfiguning Your SOMW ane antenne ste AN nn eee eRe 9 394 Gonfig
111. g the call The additional 10 seconds should provide enough time for international calls 6 2 2 Examples of Reading Values To verify that you entered the value correctly in the above examples enter ATS8 and hit RETURN in the first example ATSO in the second and ATS2 in the third example You should receive the response 005 in the first example 030 in the second example and 055 in the third example When configuring the S Registers it is a good practice to include the verification read entry in the same command line as the configuration assignment entry In the three preceding examples enter ATS8 5S8 ATS0z30S3 and ATS7 55S77 6 3 Chapter 6 S Registers AT Command and S Register Summary The vast majority of installations are similar with the modem being used to dial up a remote installation where the call is automatically answered Your modem has a default configuration to dial another modem that supports error correction data compression and flow control If the answering modem is not compatible the MultiModem can match protocols provided the protocols are industry standard i e ITU or Bell and not proprietary The amp W command used in conjunction with specific other AT commands and S Registers can re configure the modem to conform to a specific application The command AT amp WO or AT amp W causes the modem to store its current parameters in its nonvolatile RAM The command also sets the modem upon power up or
112. gh with DIP Switch 1 Chapter 9 DTR has some other modem functions DTR can be used to trigger a dialing sequence called DTR Dialing The condition of DTR can also be used to cause the modem to reset to its default parameters just as if you had given the modem an ATZ command To do this enter the command AT amp D3 and hit RETURN The modem will now reset itself whenever DTR is dropped from On to Off and will also go on hook hang up if it is on line Entering AT amp DO or AT amp D causes the modem to ignore DTR Entering AT amp D1 causes the modem to go on hook hang up with loss of DTR The modem enters Command mode when DTR goes high again Auto answer is disabled while DTR is low Entering AT amp D2 causes the modem to go on hook with loss of DTR The modem enters command mode when DTR goes high again CTS Control amp R The amp R command allows you to control the Clear to Send signal CTS Pin 5 on the RS 232C interface You have three choices You can force the CTS signal high allow it to act normally or set it to stay high until the modem disconnects go low momentarily and then go high again The last option is useful with some CBX phone systems and mainframe front ends which require CTS to act in this manner To allow CTS to act normally enter the command AT amp R0 To force CTS on enter the command AT amp R1 this is the factory default setting When the modem goes on line CTS still provides flow control To set up CTS
113. gs Modem Commands To change it in Windows 95 HyperTerminal select Call Connect from the menu bar click Dialing Properties and type 9 in the local and long distance boxes in How Dial from This Location If the modem reports NO ANSWER the other system has failed to go off hook or you might have dialed a wrong number Check the number If the modem reports NO CARRIER the phone was answered at the other end but no connection was made You might have dialed a wrong number and a person answered instead of a computer or you might have dialed the correct number but the other computer or software was turned off or faulty Check the number and try again or try calling another system to make sure your modem is working Also try calling the number on your telephone If you hear harsh sounds then another modem is answering the call and the modems may be having problems negotiating because of modem incompatibilities or line noise Try connecting at a lower speed Appendix A Troubleshooting The Modem Disconnects While On line If you have call waiting on the same phone line as your modem it may interrupt your connection when someone tries to call you If you have call waiting disable it before each call In most telephone areas you can disable call waiting by preceding the telephone number with 70 check with your local telephone company You can automatically disable call waiting by including the disabling code in the modem s dial pref
114. h AT Command mode enabled then V 25bis mode is selected Prior to executing this command make sure that your modem is properly set up to perform the type of operation you will be performing Refer to the initialization section of this appendix for information about modem set up When in V 25bis mode most normal AT commands will also function except D N O and U V 25bis operates in asynchronous or synchronous modes depending on the position of DIP Switch 12 and does not check for terminal speed so do not change speeds while in this mode or parity In synchronous mode speed is not important since the internal clocks provide synchronization To place your modem in V 25bis mode from asynchronous mode enter the AT V1 command To return to AT command mode enter the AT VO command AT V2 allows you to run one V 25bis command from AT command mode without leaving AT command mode the V 25bis command follows V2 on the command line Change Serial Baud Rate CSP Command The CSP command will change the serial baud rate of your modem by entering CSPsssss where sssss can equal 0300 300 bps 1200 1200 bps 2400 2400 bps 4800 4800 bps 9600 9600 bps 19200 19200 bps 38400 38400 bps 57600 57600 bps 115200 115200 bps 1932 and 2834 Series only Dial Phone Number Provided CRN Command The CRN command permits the dialing of the phone number immediately following it from the command line It is similar to the D comman
115. h repeat information contained in the chapters but in a more condensed form These appendices can be used as a quick reference Appendix A Troubleshooting Appendix B ASCII HEX Decimal Conversion Chart Appendix C Pulse Dial and Tone Dial Frequencies Appendix D AT Command Summary Appendix E DIP Switch Summary Appendix F S Register Summary Appendix G Result Code Summary Appendix H V 25bis Operation Appendix I Cabling Diagrams Appendix J RS 232 Interface Specifications Appendix K Regulatory Information MultiModemBA User Guide 1 3 10 Modem Features The MultiModem BA Series modem connections can be made on Public Switched Telephone Networks PSTNs and or point to point 2 wire telephone type circuits Your modem offers interactive automatic dialing as well as Command Mode option configuration You may store up to ten command line telephone numbers of up to 60 characters each in the modem s nonvolatile memory The modem pulse or tone dials and recognizes dial tones and busy signals for reliable call progress detection The modem can detect AT amp T calling card tones It is FCC Registered for connection to telephone networks without any Data Access Arrangements DAA s Your modem also features Callback Security to protect networks from unauthorized use and to manage phone line costs By using the modem s phone number and password directory a host site can upon receipt of a call callback to a remot
116. he modem s parity The AT characters alert the modem that a command follows The AT Command can also be used to clear the command buffer by simply typing AT and hitting RETURN The letter D in a command causes the modem to dial the numbers immediately following it e g ATD6127853500 You have a choice of either pulse ATDP or tone ATDT dialing methods The modem responds with CONNECT on your video display after the number is dialed and a connection signal is detected The modem is now in On Line mode and is ready to communicate with a host site If no connection signal is detected within 45 seconds this time period can be adjusted by S Register S7 the modem goes On Hook hangs up and returns to Command mode At this point your video displays NO CARRIER Enter ATH to Hang Up On Line bring modem on hook and terminate the modem s On Line mode At this point your video displays OK In addition to the call originating capabilities the modem can also automatically answer incoming calls You need not be present You can however control the situation by configuring the modem to either answer or not to answer or to answer after a specified number of rings This is done by setting the value of S Register S0 modem defaults to automatically answer an incoming call after one ring Refer to Chapter 6 for S Register details 4 3 4 4 Chapter 4 Manual Dial and Automatic Answer Manual Call Origination You can use
117. he next number failing bumps off the oldest number on the list onto the Forbidden Number list Numbers on the Delayed Number list that succeed in a connect attempt are removed If a certain number of failed attempts occur the number of failed attempts is specified by each country the number is entered into the V 25bis Forbidden Phone Number List Forbidden phone numbers cannot be dialed at all To list the phone numbers on the V 25bis Delayed Phone Number List enter RLD and hit RETURN Listing Forbidden Phone Number RLF Command Those phone numbers that have failed to connect the required number of times as specified by country regulations are removed from the Delayed Number list and entered onto the V 25bis Forbidden Number list Numbers on the Forbidden Number list cannot be dialed at all for some maximum amount of time which is also specified by country regulations In some countries the time might be one hour and in others the number may never be dialed again The forbidden list is eight numbers long with the newest number replacing the oldest if the memory is full To list the numbers in the Forbidden list enter RLF and hit RETURN Disregard or Connect to Incoming Calls DIC or CIC Command The Disregard or Connect to Incoming Calls commands are used for Auto Answer operations Depending on the country regulations your modem will wait some amount of time or number of rings before answering the call During that time you can stop the
118. hile On Line Escape Sequence Options Entering Command Mode while On Line Force Answer Mode Exit Command Mode Go Back On Line 45 MultiModemBA User Guide 46 Format Line Probe Display Graph or Table Format Enable Disable Reading Line Probe From DSP during handshake Display of Signal Strength Information Display Signal to Noise Ratio SNR L11 Display of Noise Information EXECUTE DF LINE DP PROBE L9 COMMANDS L10 2834 Series only amp RP READ AND Sr ASSIGN Sr S REGISTER VALUES REMOTE CBN CONFIGURATION DB amp CALLBACK l SECURITY RCBNxx S TEST MODEM U amp T Initiates Retrain to Read Line Probe Parameters Read Current S Register Value Assign S Register Value Passwords for Callback Phone Numbers Callback Security Enable Disable Change LOGIN Password Erase Password Linked with Memory Location xx Change SETUP Password Self Test Modem Chapter 8 Enable Disable Digital Loopback Signal 5 3 Chapter 5 Command Mode Result Codes The Command mode provides you with several responses or Result Codes that can aid you in Command mode operation These Result Codes are displayed on your video monitor You can choose result codes that closely match those of the standard AT command set or choose enhanced function result codes that have been used in Multi Tech modems Multi Tech responses The amp Q command selects which result codes will be used You can choose to have these Result Codes
119. hone carriers Place DIP Switch 3 in the DOWN position to enable 9 dB transmission Place DIP Switch 3 in the UP position to enable 15 dB transmission 9dB Transmission Switch 3 DOWN 15dB Transmission Switch 3 UP Factory Default Setting DOWN 1432 and 932 Series DIP Switch 3 adjusts dB transmission levels required by some phone carriers Place DIP Switch 3 in the DOWN position to enable 0 dB transmission Place DIP Switch 3 in the UP position to enable 10 dB transmission OdB Transmission Switch 3 DOWN 10dB Transmission Switch 3 UP Factory Default Setting DOWN Switch 4 AS 400 Mode Synchronous Mode Leased Line Dial UP The modem can function in the IBM AS 400 environment appearing like an IBM5853 modem First DIP Switch 7 must be placed in the UP position This establishes an RTS CTS condition state typical for an IBM5853 modem in half duplex mode Next place DIP Switch 4 in the DOWN position This spoofs the modem into operating like an IBM5853 modem in AS 400 applications DIP Switch 4 in the UP position disables this function Note that the modem must be in Command mode to allow AS 400 mode DIP Switch 8 DOWN and in Synchronous mode DIP Switch 12 UP AS 400 Mode Enabled Switch 4 DOWN AS 400 Mode Disabled Switch 4 UP Factory Default Setting UP Switch 4 Unix UUCP Spoofing Asynchronous Mode Leased Line Dial Up The modem can be configured for use with Unix equipment which employs
120. hronous and synchronous operation Chapter 9 of this manual also provides detailed instructions on configuring all of the modem s PC board options 17 MultiModemBA User Guide 18 Multi em Chapter 2 Installation and Connection Multi e Systems MultiModemBA User Guide 2 1 20 What is in Your Modem Package Your MultiModem is made up of many components Make sure you have them all before trying to operate your modem HOw Multi Quick Start Guide MuitiTech Figure 2 1 Unpacking MT2834BA shown Your package should include MT2834BA MT1432BA or MT932BA data fax modem RJ 11 telephone cord AC Power Transformer One 1 Quick Start Guide One 1 software CD Trio data communications and fax software This User Guide on diskette If any of these items are missing please refer to the Chapter 10 for information on contacting Tech Support 2 2 Chapter 2 Installation and Connection Installation The installation of the modem consists of making the physical connections necessary to render the modem functional with your computer This includes making the proper serial phone line and power connections Unless otherwise noted these instructions apply to all models of the BA series 2 2 4 Safety Warnings 1 Never install telephone wiring during a lightning storm 2 Never install telephone jacks in wet locations unless the jack is specifically designed for wet location
121. ice Multi Tech s fax back system provides 24 hour access to sales marketing and technical literature Dial 612 717 5888 follow the voice prompts and request document number 10 for a catalog of available documents For convenience have your fax number handy From the catalog of available documents you can order newsletters white papers press releases etc from the sales and marketing index pages 1 4 or order basic modem operation and troubleshooting guides from the technical support and engineering index Just enter the applicable FB Doc from the left column of the catalog 121 MultiModemBA User Guide 10 8 About Ordering Accessories SupplyNet Inc can supply you with replacement transformers cables and connectors for select Multi Tech products You can place an order with SupplyNet via mail phone fax or the Internet at Mail SupplyNet Inc 614 Corporate Way Valley Cottage NY 10989 Phone 800 826 0279 Fax 914 267 2420 Email info thesupplynet com Internet http www thesupplynet com SupplyNet Online Ordering Instructions 1 Browse to http www thesupplynet com In the Browse by Manufacturer drop down list select Multi Tech and click 2 To order type in quantity and click Click to change your order 4 After you have selected all of your items click BS TITRE to finalize the order The SupplyNet site uses Verisign s Secure Socket Layer SSL technology to ensure your complete shopping security
122. ing modem by turning on its CD Carrier Detect signal and the handshaking is completed Note With the modem in Reliable or Auto Reliable mode some additional handshaking takes place This is explained in Section 5 4 8 4 7 Chapter 4 Manual Dial and Automatic Answer Call Termination There are a number of ways to terminate a call or simply stated hang up They are 1 2 Command Mode Control To terminate a call by Command Mode enter ATH then RETURN or send a BREAK signal followed by ATH and a RETURN DTR Control If DTR Data Terminal Ready is turned off for 50 milliseconds or more a disconnect occurs This is probably the most common method used by computer systems at the automatic answer end of the line to cause the answering modem to disconnect after logging off procedures Loss of Carrier After a data connection is established the modem disconnects if a loss of carrier occurs for 700 milliseconds 0 7 seconds or more Note that one cause of carrier loss would be if one of the modems disconnect normally Abort Timer Answer Mode When OH Off Hook comes on the called modem starts a forty five second timer and waits for a carrier signal from the originating modem If carrier is not detected within this period the modem disconnects hangs up and is ready for another call Originate Mode The abort timer functions the same as in answer mode except that the timer begins after the modem has completed diali
123. initial handshake at 2400 to 1200 to 300 bps 932 Series A0 selects initial handshake at 9600 to 4800 to 2400 to 1200 to 300 bps A1 selects initial handshake at 9600 bps only A2 selects initial handshake at 9600 to 4800 bps A3 selects initial handshake at 2400 to 1200 to 300 bps 131 MultiModemBA User Guide Command Bn amp Bn amp BSn BAn amp Cn amp CDn Ds Ds Nd amp Dn DFn 2834 only DPn 2834 only Dn En Values n Oor1 n Oor1 n Oor1 n Oor1 n 0 1 2 4 n Oor1 s phone s phone n Othru3 n Oor1 n Oor1 n Oor1 n Oor1 Factory Default Setting Factory Default Setting for BA Mac 132 Description BO selects V 21 answer tone B1 selects Bell answer tone amp BO means normal transmit buffer size amp B1 means reduced transmit buffer size amp BSO means maximum transmit block size of 64 characters amp BS1 means maximum transmit block size of 256 characters BAO means speed conversion is on BA1 means speed conversion is off amp CO forces Carrier Detect on amp C1 lets Carrier Detect act normally amp C2 lets Carrier Detect drop S24 time on disconnect amp C4 resets modem when Carrier Detect drops amp CDO execute cleardown on disconnect amp CD1 do not execute cleardown on disconnect Dial a telephone number s where s may include up to 60 digits or T P R comma and characters Store telephone number
124. isabled amp E15 means data compression enabled EBO enables 10 bit mode EB1 enables 11 bit mode E0 Modem Won t Escape E1 Method default setting E2 Break Method E3 Either or Break Method E4 No OK Response to E5 OK Response to SEO means no fallback when on line F1 means fallbackwhen on line increments of 2400 bps F2 means fallback to 4800 bps fall forward if line improves increments of 2400 bps amp F loads factory default values from ROM amp F8 reads factory default values and switch settings when amp F is issued amp F9 reads parameters stored in non volatile memory when amp F is issued FO means do not fall back to normal connect if CR received F1 means fall back to normal connect if CR received amp GO turns off CCITT guard tones amp G1 turns on CCITT 550 Hz guard tone amp G2 turns on CCITT 1800 Hz guard tone HO means Hang Up go on hook H1 means Go Off Hook 133 MultiModemBA User Guide Command Values Hn n 2 1 thru 3 In n 0 10r2 19 2834 Series only Read Only L L5 L6 L7 L8 L9 2834 Series only L10 2834 Series only L11 2834 Series only Ln n 0 thru 3 Mn n Othru3 MBn n speed Factory Default Setting Description H1 brings up Help Screen 1 H2 brings up Help Screen 2 H3 brings up Help Screen 3 10 requests modem ID I1 requests firmware revision st I2 for MTS internal use
125. it Answer 1300 Hz Mark 2100 Hz Space for Receive Originate 390 Hz Mark 450 Hz Space for Receive Answer 11dBm dial up 9 or 15 dBm leased line dBm level selectable with DIP Switch 3 in leased line setting 10dBm dial up 0 dBm leased line dBm level selectable with DIP Switch 3 in leased line setting 10dBm dial up 9 dBm leased line dBm level selectable with DIP Switch 3 in leased line setting 0 01 14 Receiver Sensitivity All models AGC Dynamic Range All models Interface All models Connectors All models Diagnostics All models Indicators All models Controls All models Speaker All models Operating Temperature All models Power Requirements All models Dimensions All models Weight All models Limited Warranty All models Chapter 1 Introduction and Description 43 dBm under worst case conditions 43 dB EIA RS 232C ITU V 24 One DB 25 RS 232C connector two RJ11 for phone line telephone set power Power on Self Test Local Analog Loop Local Digital Loop Remote Digital Loop Back to Back Test LEDs for Transmit Data Receive Data Carrier Detect Speed Indicators Off Hook Terminal Ready Error Correction Fax and Error Toggle switches for Voice Data with Originate or Answer Power On Off and DIP Switches for various modem options Speaker for call progress monitoring 0 to 50 C 32 to 120 F 115 Volts AC 60Hz 0 3amp 2 prong outlet
126. it for the time specified in S7for at least one ringback and 5 seconds of silence If a busy signal is detected the modem hangs up and generates a BUSY result code If it does not detect 5 seconds of silence a NO ANSWER result code is generated after hanging up If 5 seconds of silence is detected the second number 631 3550 is then dialed Chapter 5 Command Mode 5 4 3 Phone Number Memory Commands Storing Phone Numbers D N A telephone number and command line of up to sixty characters may be stored in the modem s number memory As many as ten of these numbers may be stored Each number will be given a name using the codes NO N1 N2 up to N9 A phone number is stored by entering ATD then the number as it would be dialed along with any P T R or comma characters and then entering N followed by the number s name which would be any number from 0 through 9 and then hitting RETURN For example the tone dialed number 1 612 631 3550 would be stored as number N3 by entering ATDT16126313550N3 and RETURN The number is not dialed with this store command After storing a number check to see that it has been stored correctly by typing ATL and hitting RETURN When phone numbers are stored the entire command line is also stored so that you can effectively create a macro for each number For example if you know a particular number needs to have extended result codes detect busy or dial tone error correction Xon Xoff flow control
127. ix e g ATDT 70 note the comma which inserts a pause before the number is dialed To change the dial prefix in Windows Terminal select Settings Modem Commands To change it in Windows 95 HyperTerminal select Call Connect from the menu bar click Dialing Properties check this location has Call Waiting and select the correct code for your phone service If you have extension phones on the same line as your modem you or someone else can interrupt the connection by picking up another phone If this is a frequent problem disconnect the extension phones before using the modem or install another phone line especially for the modem Check for loose connections between the modem and the computer the telephone jack and AC power You may have had a poor connection because of line conditions or the problem may have originated on the other end of the line Try again If you were on line with a BBS it may have hung up on you because of lack of activity on your part or because you exceeded your time limit for the day Try again The Modem Cannot Connect When Answering Auto answer may be disabled Turn on auto answer in your datacomm program or send the command ATSOz1 to your modem in terminal mode File Transfer Is Slower Than It Should Be You may have an older UART For best throughput install a 16550AFN UART or a Multi Tech ISI serial port card See the Quick Start chapter for information on how to identify your UART If you are
128. k phone numbers Callback Passwords tell your modem what dial back phone number to call The Remote Escape Character is the key to using the Remote Configuration feature The Remote Escape Character lets you enter Command mode via a remote call so that you can enter AT commands just as if you were locally connected You must also enter your modem s Setup Password The Remote Escape Character is contained in S Register S13 Callback Feature Description The Callback feature protects your network from unauthorized access and helps control long distance costs By use of Callback Passwords and dial back phone numbers you can have your modem dial back remote locations immediately after being called A special command Enable Callback 4DB turns your modem into a Callback security modem The Callback Password Phone number entry is protected by two level security your modem s LOGIN Password and Set Up Password that keeps unauthorized personnel from changing parameters When you first get your modem you need to change both security level codes to your unique settings The Callback Passwords and dial back phone numbers are in a special Callback Password dial back phone number memory 30 numbers long You use the modem s LOGIN Password and the Set Up Password plus special Callback commands to access this memory The memory is thirty numbers long and replaces your modem s normal phone number memory Each number is 35 characters long and can contain com
129. l connections as a guide to install your modem to the point of operation In addition this chapter guides you through the installation of Trio the communications software included with your modem Chapter 3 Software Configuration and Modem Basics Chapter 3 documents communication software configuration recommended specifically for the MultiModem Other issues covered include setting up initialization strings changing default parameters configuring software for the remote system and file transfer protocols Chapter 4 Manual Dial and Automatic Answer Chapter 4 covers some modem operations but delays discussion on Command Mode operation until Chapter 5 Automatic Leased Line Restoration Dial backup Manual Dial Mode and Answer Mode operation are covered in detail as well as the handshaking procedures employed between two modems in an auto answer application Chapter 1 Introduction and Description Chapter 5 AT Command Mode Operation Chapter 5 may be the most important chapter of this manual It begins with an introduction and discussion on Command Mode fundamentals A flow chart is provided to illustrate Command Mode and On Line Mode operation and the methods used in each mode Next there is a summary of the modem s commands and responses We then go into a detailed explanation of each modem command providing examples where applicable Chapter 6 S Registers Chapter 6 covers the modem s S Registers which enable the user to
130. l is not recommended because an Xoff character may be part of the data and would trigger an Xoff of the modem or software package which would halt data flow Chapter 5 Command Mode Xon Xoff Pass Through amp E7 So far you have had three choices to make regarding pacing 1 You can set the modem to respond to Xon Xoff pacing 2 Youcan set the modem to respond to RTS pacing 3 Youcan set the modem to ignore pacing completely Well we re not done with pacing yet There s another choice you can make which actually can apply to both pacing and modem initiated flow control although it applies mainly to pacing and that is something called Xon Xoff Pass Through This means that if your modem is set to respond to Xon Xoff commands you can have the modem do one of the following 1 The modem responds to the Xon and Xoff pacing commands while at the same time allowing these commands to pass through the modem and on to the remote location We call this Respond Pass Through 2 The modem responds to Xon Xoff pacing but does not allow the pacing signals to pass through the modem and on to the remote location We call this Respond No Pass Through When Xon and Xoff commands are allowed to pass through the modem the computer or terminal at the remote site will receive these commands and depending on how it is configured the computer or terminal may respond to them also When two MultiModems are connected in Normal mode no
131. ly via the keyboard command ATD or by pressing the Voice Data switch on the modem s front panel downward To force the modem to automatically answer calls either type ATA or press the Voice Data switch on the modem s front panel upward Automatic Answering The modem can be used as an automatic answering modem No special modifications or settings are required other than making sure that the Auto Answer select switch is set to Auto answer enabled DIP Switch 5 UP The modem when in its idle state is set for Originate mode frequencies An incoming ring signal automatically switches the modem into Answer mode You can program the modem to answer a call after a certain number of rings using S Register SO see Chapter 6 Refer to Section 4 10 for the handshaking procedures used by the modem when in automatic answer mode In many originate only applications you may wish to disable the automatic answer capability of the modem If a telephone set is connected to the modem you may wish to receive incoming calls in a voice mode for normal voice conversation If auto answer is not disabled all incoming calls are answered by the modem preventing voice communications To disable automatic answer place DIP Switch 5 to the DOWN Disable Auto Answer position refer to Chapter 9 Another way to disable automatic answer is to use S Register SO to configure the modem to answer on the nth ring where n equals zero 0 Another alternative is to hav
132. mand lets the software to determine the type of modem with which it is communicating When ATI or ATIO is entered the modem responds with 247 When ATH is entered the modem responds with a three digit code indicating the firmware version number When ATI2 is entered the modem responds with MT2834BA MT1432BA or MT932BA depending on model Windows 95 Autodetect Inquiry I9 2834 Series only This read command permits a Windows 95 operating system to query the MT2834BA s characteristics When ATI9 CH is entered the symbols BA 28800 FAX CT are displayed which indicates to the Windows 95 system that your particular modem is a MT2834BA 28 800 bps fax Class 2 capable modem With autodetect support in your MT2834BA your PC can automatically allocate resources and configure it and other devices The MT2834BA implements autodetect capability in the form of a single NF Information file that specifies AT Command mode and Result Code Registry Keys that are specific to your MT2834BA Listing Current Operating Parameters L5 L7 The L5 and L7 commands list the current operating parameters of your modem This information can be very useful when you are changing communications software or when you are changing modem default settings The command to list the modem s current operating parameters is ATL5 for the basic parameters Entering ATL7 lists additional parameters on the modem Listing S Register Values L6 Entering ATL6 lists the current val
133. mands as well as phone numbers You need to set up your modem with the numbers and codes as part of the dial back initialization procedures Your modem will also remember if the incoming call was reliable or not and make the call back accordingly Chapter 7 Callback Security and Remote Configuration 7 3 Remote Configuration Description The Remote Configuration feature is a network management tool that allows you to configure modems remotely This means you could configure modems anywhere in your network from one location without having to visit the sites or rely on remote users to follow your instructions With Remote Configuration which is protected by two level security you can download new parameters program new V 42 capabilities and implement new features Remote Configuration also makes troubleshooting a remote location a lot easier The way Remote Configuration works is that S Register S13 has been set up to contain the special Remote Configuration escape code When calling a Remote Configuration equipped modem you enter the proper Remote Escape code to enable entering your Set up Password After entering it you can then execute AT commands as if you were connected locally If you set S Register S13 to zero Remote Configuration is disabled 7 3 1 Initial Setup Procedures for Callback and Remote Configuration Your modem was shipped with a default LOGIN Password and Setup Password LOGIN MULTI TECH and Set up MODEMSETUP so that
134. mmand Summary Command AT RETURN An An Factory Default Setting Values n Oor1 n Othru3 Appendix D AT Command Summary Description Attention Code that precedes most command strings except A A and Escape Codes Pressing RETURN key executes most commands This symbol placed in dialing string enables the modem to detect AT amp T s call card tones for accessing user s calling card to originate an on line connection Answer call even if no ring present Repeat last command Do not precede this command with AT Do not hit RETURN to execute Continuous redial 10 redials in DOC units of last number until answered Not used Internationally A0 discards data during auto reliable time period A1 buffers data during auto reliable time period 2834 Series A0 selects initial handshake at 33 600 to 31 200 to 28 800 to 24000 to 21 600 to 19 200 to 16 800 to 14 400 to 12 000 to 9600 to 4800 to 2400 to 1200 to 300 bps A1 selects initial handshake at 33 600 bps only A2 selects initial handshake at 33 600 to 31 200 to 28 800 to 24000 to 21600 to 19 200 to 16 800 19 200 to 14 400 to 9600 to 4800 bps A3 selects initial handshake at 2400 to 1200 to 300 bps 1432 Series A0 selects initial handshake at 14 400 to 12 000 to 9600 to 4800 to 2400 to 1200 to 300 bps A1 selects initial handshake at 14 400 bps only A2 selects initial handshake at 14 400 to 9600 to 4800 bps A3 selects
135. modem from answering the call by entering the DIC Disregard Incoming Calls command The CIC Connect to Incoming Calls command will cause your modem to answer the call either reversing the effect of a DIC command or simply have your modem answer the call immediately without waiting the regulation time before answering DTR Dialing D Command DTR Dialing is an alternate method of causing the modem to automatically dial a number Data Terminal Ready DTR is a signal that comes into the modem from the terminal or computer to which itis connected via pin 20 of the RS 232 interface In DTR Dialing the modem will automatically dial a stored number as soon as it receives a high DTR signal The DTR Dialing method is popular when using the modem in synchronous applications To enable DTR Dialing enter the command AT D1 and hit Return The modem will now dial the phone number you have stored as NO when it receives a high DTR signal see the D N command in Chapter 5 DTR must remain high for the duration of the call until disconnect To disable DTR Dialing enter the command AT D0 or AT D and hit RETURN When you use DTR Dialing be sure that DIP Switch 1 is in the UP position so that DTR is not forced on In addition when using DTR Dialing in a synchronous application be sure that DIP Switch 8 is in the UP position to disable V 25bis Command mode 151 MultiModemBA User Guide 152 ITU V 25bis Country Specific Information D
136. modem to disconnect The most common use of DTR is in automatic answer applications A high DTR signal is required by the modem to answer a call A frequently used method is to have the computer turn on DTR in response to HI Ring Indicator which allows the modem to answer Later DTR is turned off at the conclusion of the log off procedure which forces the modem to disconnect enabling it to receive another call In non auto answer applications it is advisable to leave DTR on using the modem s DIP Switch option This is the standard factory setting An alternative is to provide a constant high DTR from the terminal or computer The Data Terminal Ready DTR LED indicates the status of this signal Ring Indicator Pin 22 RI CE Direction from modem This signal will remain on for the duration of the ringing signal When a ring signal is received by the modem the modem will automatically answer after the first ring The modem will answer after a specified number of rings which can be programmed in AT Command mode but if none is specified the modem will answer after the first ring Appendix J RS 232C Interface Specifications External Transmit Clock Pin 24 XTC Direction to modem Supplies the same function as transmit clock on Pin 15 Terminal Busy Out of Service Pin 25 OOS Direction to modem The Terminal Busy OOS circuit is not defined in the RS 232C standard but is used by us and most manufacturers to make the pho
137. mote escape character 89 MultiModemBA User Guide To turn your modem s Callback Security feature on and off 7 If you want Callback Security with both remote and local password security enter ATZDB1 and hit RETURN You must turn on Callback Security to be able to enter dial back phone numbers 8 lf you want Callback Security on with just remote password security enter ATZDB2 and hit RETURN You must turn on Callback Security to be able to enter dial back phone numbers If you want to use your modem to call another modem that is also set for Callback you must enter AT DB3 before you dial Note this is for your modem if you are set for DB1 or DB2 Once you have disconnected from that call your modem will go back to its original setting 9 If you want Callback Security turned off type ATZDBO and hit RETURN To set parity of the password message prompt 10 The parity default value for your modem is no parity ATZPO If your modem s prompt messages use even parity enter ATZP2 and hit RETURN For odd parity enter ATZP1 and hit RETURN 11 Enter the amp W0 command and hit RETURN to store parameters and S Register values in RAM Table 7 2 Callback Password and Dial Back Phone Number Entry Procedures Step Procedure 1 Enter your modem s LOGIN Password as selected in Table 7 1 by entering the following ATZIxxxxxxxxxx CH xxxxxxxxxx from Table 7 1 Enter your modem s Setup Password as selected in Table 7 1 by entering the f
138. mounted transformer 240V 50Hz optional International 6 150 x 9 00 x 1 375 15 6 cm x 22 9 cm x 3 5 cm 1 6 pounds 0 72 Kg without transformer 2 6 pounds 1 18Kg with transformer Five Years 15 MultiModemBA User Guide 1 6 1 7 16 Power Power is supplied through an AC power transformer terminated with a standard two prong plug The transformer supplies low voltage AC to the modem and plugs into any conventional 115 volt AC 60 Hz two prong power outlet 240 volts AC 50Hz 3 Amp for International modems The power transformer supplied with the modem is the only one that should be used Use of any other transformer could cause damage to the modem A Power On Off switch is located on the back of the modem Modem LED Indicators The MultiModem diagnostic LED indicators are shown in Figures 1 1a 1 1b and 1 1c Muiti co Multem eeo 5 Figure 1 1a MT2834 LED Display Multi 8 Mutti 0900000000007 Figure 1 1b MT1432 LED Display Multi 8 Multi Ga een GE 200001010 Qe Hien 7n Modem Voice Data Figure 1 1c MT932 LED Display SD Send Transmit Data This LED blinks when data is being transmitted on for a space off for a mark The state of this LED matches the TD circuit on Pin 2 of the RS 232C V 24 interface RD Receive Data This LED blinks when data is being received on for a space off for a mark The stat
139. n RAM and the factory default configuration settings in ROM The amp F8 and amp F9 commands define the function of the amp F command The modem is shipped from the factory with a pre configured set of command and S Register default settings This set of factory defaults can be recalled by issuing the amp F command In addition to being able to recall the factory installed defaults the amp F command can also recall those defaults stored under amp W0 This is done using the amp F9 command If you have stored parameters with the amp W0 command and wish these settings to always be used as your defaults you would enter amp F9 amp WO To return the amp F command to read factory installed defaults enter amp F8 amp W0 amp F8 is the factory default Many datacomm program issue the amp F command automatically the amp F9 command allows the user to select their own factory defaults Note that the amp F8 amp F9 commands should be used with amp WO Following is a summary of how the amp F and Z reset commands interact with the amp W command note how the amp F reset command operates differently from the Z reset command Previous Command AT amp F Power On and ATZ AT amp W1 default ROM ROM AT amp WO ROM NVRAM AT amp F8 amp W0 ROM NVRAM AT amp F9 amp WO NVRAM NVRAM Modem Reset Z The Z command can be used to reset the entire Command Mode buffer and the result is the same as if you had disconnected and then reconnected po
140. n access to your modem using its password security system Units 1 failed attempt Range 0 255 Default 0 Local Inactivity Timer S29 S29 defines the amount of idle time that can elapse between AT commands after the SETUP password has been entered If this timer expires the LOGIN and SETUP passwords will have to be re entered S29 only takes effect when the modem has been sent a ZDB1 command which secures the modem from local and remote configuration or dialing i e no AT commands can be sent until the LOGIN and SETUP passwords have been entered Units Minutes Range 1 255 Default 20 95 MultiModemBA User Guide 96 Multi Chapter 8 Modem Testing Multi Te Systems MultiModemBA User Guide 8 1 98 Introduction Each time you power up the MultiModem it performs an automatic self test to ensure proper operation The modem also has four diagnostic test features Local Analog Loopback Digital Loopback remote automatic Digital Loopback local manual and a modem Back to Back test A loopback test involves entering data from your PC and looping that data through the circuits of your modem and or a remote modem When the loop has been completed the original data entered should match the data received back on your PCs monitor after the test The Local Analog Loopback Test allows you to verify that the modem s transmitter and receiver circuits are functioning properly The Digital Loopback Test l
141. nal clocking is when the DTE provides transmit clocking to the modem on pin 24 of the RS 232C interface amp XO is the default setting which allows DIP Switch 11 to control Internal External Clocking default Internal Internal clocking is when the modem provides transmit clock to the DTE on pin 15 of the RS 232C V 24 interface The amp X1 command overrides DIP Switch 11 and selects External clocking If DIP Switch 11 is UP External clocking you can not override Internal clocking amp X2 enables Slave Clocking The amp X2 Command causes the modem to generate the transmit clock timing pin 15 from the receive clock pin 17 from the DTE therefore 15 and 17 are the same In this mode Slave Clocking all timing is controlled by the receive clock 55 MultiModemBA User Guide 56 5 4 5 Command Response Result Code Commands Echo Command Mode Characters E If the modem is connected to a full duplex computer it may be necessary for the modem to be configured to echo back characters entered while in the Command Mode in order for them to be displayed The E command is used to configure the Command Mode echo with ATEO disabling the echo and ATE1 enabling the echo default Result Codes Enable Disable and No Response Answer Q The Q command enables or disables Result Codes and the No Response Answer mode of operation Result Codes may be disabled altogether in certain applications such as computer controlled auto dialing using
142. nd 103 113 domestic models only V 21 V 23 Int l models only CCITT V 42bis V 42 V 32bis V 32 V 21 V 22bis V 22 V 23 V 25bis Bell 212A and 103 113 CCITT V 17 Group 3 T 4 T 30 adn EIA TR 29 Class 2 Bell 212A and 103 113 domestic models only V 21 V 23 Intl models only CCITT V 42bis V 42 V 32 V 21 V 22bis V 22 V 23 V 25bis Bell 212A and 103 113 CCITT V 17 Group 3 T 4 T 30 adn EIA TR 29 Class 2 Bell 212A and 103 113 domestic models only V 21 V 23 Int models only V 42 LAP M or MNP 3 amp 4 error correction Data Compression All models Speed Conversion 2834 Series 1432 Series 932 Series Flow Control Options All models Mode of Operation All models Intelligent Features All models Command Buffer All models Modulation 2834 Series 1432 Series 932 Series Fax Modulations 2834 and 1432 Series 932 Series Chapter 1 Introduction and Description V 42bis 4 1 throughput or MNP 5 2 1 throughput data compression Serial port data rates adjustable to 300 1200 2400 4800 9600 19 200 38 400 57 600 and 115 200 bps Serial port data rates adjustable to 300 1200 2400 4800 9600 19 200 38 400 and 57 600 bps Serial port data rates adjustable to 300 1200 2400 4800 9600 19 200 38 400 and 38 400 bps Xon Xoff Hardware RTS CTS ENQ ACK Unix to Unix Copy Protocol UUCP Spoofing Full duplex over both dial up lines and 2 wire leased lines a
143. ndows 3 1 Windows 3 1 may cause a loss of data when communicating at high speed even with a 16550 UART installed Because Windows is multitasking it switches between several programs running at the same time it can make the serial port wait briefly while Windows performs other tasks Meanwhile incoming data can be lost The older 8250A and 16450 UARTS can store data in a one byte first in first out FIFO buffer a memory area in the UART in which the first bit in is the first out but once the buffer is full the data is lost The 16550 has a 16 byte FIFO buffer which accounts for much of its high speed However in Windows 3 1 the 16550 s FIFO buffer is disabled by default To enable the buffer use Notepad to open the SYSTEM INI file in your Windows directory and add the following line to the 386Enh section COMnFIFO 1 where n is the number of the COM port the 16550 is installed on For example if the 16550 is installed on COMe the line should be COM2FIFO 1 After you save SYSTEM INI you must restart Windows for the change to take effect However there is another problem when the FIFO buffer is enabled Windows cannot recognize the COM port because of a bug in the Windows 3 1 serial port driver COMM DRV The only way around this problem is to replace the COMM DV le in the WINDOWS SYSTEM directory with another driver Several drivers are available commercially or on BBSs that will solve this problem A freeware driver called Cyb
144. ne lines busy to incoming phone calls Pin 25 is not normally connected to the RS 232C interface when shipped from the factory it can be ordered connected as an option If pin 25 is connected and is brought high the modem will be placed Off Hook and busy to incoming calls 159 MultiModemBA User Guide Appendix K Regulatory Information 160 Compliance with European Community Requirements EMC Safety and Terminal Directive Compliance The CE mark is affixed to this product to confirm compliance with the following European Community Directives Council Directive 89 336 EEC of 3 May 1989 on the approximation of the laws of Member States relating to electromagnetic compatibility and Council Directive 73 23 EEC of 19 February 1973 on the harmonization of the laws of Member States relating to electrical equipment designed for use within certain voltage limits and Council Directive 98 13 EC of 12 March 1998 on the approximation of the laws of Member States concerning telecommunications and Satellite earth station equipment European Directives User Guide Statement Note The following statement applies only to products marked with Pan European approval markings The equipment has been approved to Commission Decision CTR21 for pan European single terminal connection to the Public Switched Telephone Network PSTN However due to differences between the individual PSTNs provided in different countries the approval does not
145. nfiguration character The default is three percent symbols When the S13 character is entered three consecutive times from a remotely connected site your modem responds with its Remote Configuration procedure Value for International and DOC units Value for International units only S15 Chapter 6 S Registers Callback Time Delay Unit Range Default Description S16 Seconds 10 255 20 15 defines the time delay between Callback attempts after initial passwords have been exchanged between modems Refer to Chapter 7 for Callback Security information Callback Attempts Unit Range Default Description S17 1 Attempt 1 255 4 16 defines the number of attempts allowed after initial passwords have been exchanged between modems Changing Break Time Unit Range Default Description 24 10 mSec 0 2 5 sec 250 S17 defines the break time space sent to the local PC The default is set for a 25 to 250 mSec break The break time can be changed in 10 mSec increments by increasing or decreasing the value of S17 PBX CBX Disconnect Drop Time for DSR CTS CD Unit Range Default Description 25 50 mSec 0 255 20 Some PBX and CBX phone systems require the modem s DSR CTS and or CD signal s to behave in a certain manner when calls are disconnected The modem s amp R amp S and amp C commands cause the modem to drop these signal s for a specified time period upon
146. ng instead of when it first goes off hook It is possible to change this forty five second wait period to any other value from 0 seconds up to 255 seconds or to disable the timer completely by re configuring S Register S7 see Chapter 6 Inactivity Timer Causes the modem to disconnect if no data is transmitted or received for a specified time The timer is restored any time a character is passed through the serial port in either a send or receive state This timer runs in both normal or reliable connections and is controlled by S Register S30 The Inactivity Timer can be disabled by setting S30 to 0 which is the factory default setting 39 MultiModemBA User Guide 40 Multi L Chapter 5 Command Mode Multi Te Systems MultiModemBA User Guide 5 1 42 Introduction AT commands are the means by which you and your communications software are able to communicate with and configure your modem They enable you to establish read and modify parameters in addition to dialing The following provides both a summary and a detailed explanation of the AT commands recognized by the MultiModem 5 1 1 AT Command Editing The BACKSPACE key on your keyboard can be used to edit characters in the AT command line An AT command is not executed until the RETURN key is pressed The BACKSPACE key erases the previous character for reentering The BACKSPACE key does not erase the AT characters once they are entered If your keyboard h
147. o be on during dialing and off during handshake ATMT is the default setting and the one that should be used in most applications Enable or Disable Recognition of Remote Digital Loop Signal amp T The modem has several self test features covered in Chapter 8 The tests are activated with different U commands such as ATUfT and so forth The amp T command is a phone line conditioning command that enables or disables the modem s ability to recognize the Remote Digital Loop RDL test signal The AT amp T4 command lets the modem respond to a RDL signal and places itself in digital loop The AT amp T5 command causes the modem to ignore the RDL signal The factory default is amp T5 Enable Disable Trelis Coded Modulation T This command enables or disables the Trellis Coded Modulation of the modem There is usually no need to disable turn off Trellis codings except under an unusual line condition called impulse noise AT TO turns Trellis coding off and AT T1 turns Trellis coding on factory default Chapter 5 Command Mode Fallback Modes When On Line F If line conditions deteriorate the modem automatically drops its transmission speed fallback The XF command controls the different ways the modem falls back During operation if the error rate becomes too great the modem performs a retrain If after the retrain the error rate is still too high for 33600 bps 19200 bps for 1932 models 14400 bps for 1432 models operation
148. o respond with OK to The E command is used to select these options as follows E0 Modem Won t Escape E1 AT lt CR gt Method default E2 Break Method E3 Either or Break Methods E4 No OK Response to E5 OK Response to The E4 and E5 commands enable or disable an OK response which is required by some software packages during an escape sequence Chapter 5 Command Mode Force Answer Mode A You can force the modem into Answer mode with the modem s A command Entering ATA when in Command mode immediately brings your modem off hook out of Command mode and into On Line Answer mode and causes it to transmit its carrier signal over the phone line If no responding carrier tone is received by your modem within forty five seconds or some other time as determined by S Register S7 your modem stops transmitting its tone hangs up and goes back into Command mode Exiting Command Mode Going Back On Line O You can bring the modem out of Command mode and back into On Line mode by entering ATO where O is the letter O not the number 0 In this case the O command reverses what was done by entering the Escape Code The O command will bring the modem into the same On Line mode Originate or Answer that it was in prior to going into Command mode 5 4 13 Line Probe Commands 2834 Series only Before V 34 negotiation takes place remote and local modems transfer their functional capabilities
149. ocal manual allows you to verify that the remote computer or terminal the remote modem serial ports the telephone line and the local modem are functioning properly The Digital Loopback Test remote automatic allows you to verify that the local computer or terminal the two modems and the transmission line between them are functioning properly The Back to Back test lets you connect two MultiModems with a back to back cable to verify proper modem operation In asynchronous mode upon completion of testing enter either Escape Sequence AT lt CR gt or lt BREAK gt AT lt CR gt Note All loopback tests will operate at all soeeds except 300 bps Disable error correction amp E0 amp WO CH before engaging in loopback tests self test and back to back test not affected 8 2 Chapter 8 Modem Testing Local Analog Loopback Test V 54 Loop 3 In this test data from your computer or terminal is sent to your modem s transmitter converted into analog form looped back to the receiver converted into digital form and then received back at your monitor for verification No connection to the phone line is required See Figure 8 1 UUUUU UUUUU Digital Analog Computer or Terminal Local MultiModem Figure 8 1 Local Analog Loopback Test The test procedure is as follows 1 Connect the modem to your computer With your communication software set the desired baud rate 2 Type ATUO or ATU and hit ENTER This places you
150. ode On Slave Clocking Off Slave Clocking On RTS Dependent on interface RTS forced on at all times Command Mode Off Command Mode On Local Digital Loopback On Remote Digital Loopback On Dial Up Operation Leased Line Operation External Clock selected Internal Clock selected Synchronous Mode On DIP Switch Condition Effect 1 UP Down 2 UP Down 3 UP Down 4 UP Down 5 UP Down 6 UP Down 7 UP Down 8 UP Down 9 UP Down 10 UP Down 11 UP Down 12 UP Down Factory Default Setting Asynchronous Mode On 141 MultiModemBA User Guide 142 DIP Switches 13 14 Note The modem baud rate command MBn overrides the setting of these speed selection switches DIP switches 13 and 14 2834 Series SWITCH 113 114 113 114 113 114 13 14 1432 Series SWITCH 13 14 13 14 13 14 13 14 932 Series SWITCH 13 14 13 14 13 14 13 14 CONDITION UP UP DOWN UP UP DOWN DOWN DOWN CONDITION UP UP DOWN UP UP DOWN DOWN DOWN CONDITION UP UP DOWN UP UP DOWN DOWN DOWN DIP Switches 15 16 15 15 16 16 UP DOWN UP DOWN EFFECT 28 8 K bps Operation 19 2 K bps Operation 14 4 K bps Operation 9600 bps Operation EFFECT 14 4 K bps Operation 9600 bps Operation 4800 bps Operation 2400 bps Operation EFFECT 9600 bps Operation 4800 bps Operation 2400 bps Operation 1200 bps Operation CD DSR from Interface CD DSR Forced On Not Used
151. odem s transmit and receive circuits as well as your computer s serial COM port and the phone lines If the test results in a mismatch of entered received data multiple upper case U characters in Figure 8 6 the Local Analog Loopback Test should be performed on both the remote and local modems If that test is successful the problem may be the phone lines First make certain that you are set up for Synchronous operation by placing DIP Switch 12 in the UP position To initiate the Digital Loopback Test remote automatic DIP Switch 9 must be in the DOWN position and the Answer Originate switch front of the modem must be toggled to the UP position Once you receive an OK message from your modem if responses are enabled the local modem is placed in Digital Loopback mode To exit the Digital Loopback Test remote automatic toggle the front panel Answ Orig switch to the Answer position UUUUU UUUUU Digital Analog Analog Digital Computer or Terminal Local MultiModem Remote MultiModem Computer or Terminal DIP Switch 9 UP Answ Orig Switch Toggled to Answ position when On line Figure 8 7 Synchronous Mode Digital Loopback Test remote automatic 105 MultiModemBA User Guide 106 Multi L Chapter 9 DIP Switch Settings Multi Te Systems MultiModemBA User Guide 9 1 Introduction There are several DIP Switch options on the modem s printed circuit PC board The DIP Switches are accessible thro
152. ol If you are running under Windows 3 1 and have a 16550AFN UART you may need to turn on the 16550 s data buffers and or replace the Windows serial driver COMM DRV Try entering the L8 List Online Diagnostics command in on line mode making a screen print of the diagnostics listing and checking for parameters that may be unacceptable number of retrains round trip delay etc Am Getting Garbage Characters on the Monitor Your computer and the remote computer may be set to different word lengths stop bits or parities If you have connected at 8 N 1 try changing to 7 E 1 or vice versa using your communications software You may be experiencing line noise Enable error correction if it is disabled or hang up and call again you may get a better connection At speeds above 2400 bps the remote modem might not use the same transmission or error correction standards as your modem Try connecting at a slower speed or disabling error correction With no error correction however line noise can cause garbage characters Try entering the L8 List Online Diagnostics command in on line mode making a screen print of the diagnostics listing and checking for parameters that may be unacceptable number of retrains round trip delay etc My Fax and Communications Software Won t Run at the Same Time Communications devices can be accessed by only one application at a time Under DOS or Windows 3 1x you can run either your fax soft
153. ol method Xon Xoff characters in the data dictate the start and stop of data flow from the computer or terminal Place DIP Switch 2 in the DOWN position to select Xon Xoff Flow Control Hardware Flow Control amp E4 Switch 2 UP Xon Xoff Flow Control amp E5 Switch 2 DOWN Factory Default Setting UP Switch 2 SDLC BSC Option Synchronous Mode Leased Line Dial Up Synchronous Data Link Control SDLC and Binary Synchronous Control BSC are two error correction protocols used in the IBM Mainframe environment Place DIP Switch 2 in the UP position to enable SDLC mode and place DIP Switch 2 in the DOWN position to enable BSC mode SDLC Mode Switch 2 UP BSC Mode Switch 2 DOWN Factory Default Setting UP Switch 3 Enable Suppress Responses Q Asynchronous Mode Dial Up In some Asynchronous mode applications you may want to suppress all responses from the modem Place DIP Switch 3 in the DOWN position to enable Result Code responses Q0 Place DIP Switch 3 in the UP position and answer mode is handled without responses and echo turned off Q2 but originate is still intelligent Enable Responses Originate Answer OO Switch 3 DOWN Suppress Responses Answer Q2 Switch 3 UP Factory Default Setting DOWN 109 MultiModemBA User Guide 110 Switch 3 dB Transmission Levels Asynchronous Synchronous Mode Leased Line 2834 Series DIP Switch 3 adjusts dB transmission levels required by some p
154. ollowing AT Syyyyyyyyyy lt CR gt yyyyyyyyyy from Table 7 1 2 Enable the Callback Security feature by entering the following AT DB2 lt CR gt or AT DB1 lt CR gt The following message is displayed on your monitor Entering Callback Mode current phone numbers will be erased Do you want to continue Y N 3 Enter a Yor Nand hit RETURN Note If this is your first time into Callback Mode we recommend answering Y to clear all previous Callback Passwords and phone numbers from memory 4 Enter individual Callback Passwords for each of 30 different phone number memory locations as follows ATZCBNOxxxxxxxxxx CH To enter Callback Password for the first location a minimum 6 characters up to a maximum of 10 characters must be used ATZCBN1xxxxxxxxxx CH To enter Callback Password for the second location etc a minimum 6 characters up to a maximum of 10 characters must be used Note The first character of your first Callback Password must be non numeric 5 Enter individual phone numbers for each of the 30 memory locations as follows AT DP 22 NO CR number for location NO AT DT 2 2 N1 CR number for location N1 etc Note You must indicate within the command string that the modem either Pulse dial ATDP or Tone dial ATDT The maximum length of the number is 35 characters The number may include commands as well as your number so as to create macro type command numbers 90 Chapter 7 C
155. on an conan 120 Bell Bos MONG mec ERR 58 SE Ee E 74 Buffer Length of Command Mode After On line ESCH EE 83 Bulletin board systems 29 31 32 C Gall WANIMO ei ee ales a 127 Callback Attempts 2 reete ipte eds 81 Callback Operational Sequence Procedures 91 Callback Password and Dial Back Phone Number En ita ze EE 90 Callback Retry Attempts AAA 95 Callback Security Enable Disable 4 DB 93 Callback Time Delay 81 95 Calling Card Detect Tones 52 Carrier Detect Control amp C 61 Carrier Detect Response Time 80 Carrier Detect DSR Forcing 114 Carrier Frequencies seeesseesese 14 Carrier Loss Disconnect Delay Time 80 Change LOGIN Password 1 93 Change Serial Baud Rate CSP Command 150 Change SETUP Password 4S 93 Changing Break Time iiiter itc ease 81 Clear To Send 157 Cleardown at Disconnect 59 COM ports COI 29 31 COMM DV sees 29 127 128 Command Bunter semaine 13 Command mode demuestra tide 43 Command Sting nette 30 Command Summary sss 131 Commands Attention Bereet 29 Auto Reliable mode 32 Data compreselon sreviirciistriiin
156. on as a V 22bis modem at 2400 bps with fallback to 1200 to 300 bps ATZAO is the factory default value Chapter 5 Command Mode 5 4 7 RS 232C Interface Control Commands Carrier Detect Control amp C The amp C command allows you to control the status of the Carrier Detect signal CD Pin 8 on the RS 232C line You have four choices You can force the signal high or allow it to act normally or force the modem to reset when CD drops or set it to stay high until the modem disconnects go low momentarily and then go high again The last option is useful with some CBX phone systems and mainframe front ends which require CD to act in this manner To allow CD to act normally enter the command AT amp C1 the factory default setting To force CD on enter AT amp CO To reset the modem to its current parameters when CD drops enter AT amp C4 To set up CD so that it drops for one second on disconnect and then comes up again enter AT amp C2 If you want the drop time to be something other than one second use S Register S24 to change this value Refer to the Chapter 6 instructions for S24 Data Terminal Ready Control amp D Data Terminal Ready DTR on pin 20 of the RS 232C interface is required in order for the modem to operate A high DTR signal tells the modem that the device to which it is connected is active or ready to communicate through the modem If the signal is not being provided on the RS 232C interface you can force DTR hi
157. one on line Modem has detected carrier at 26400 bps and gone on line Modem has detected carrier at 28800 bps and gone on line Modem has detected carrier at 31200 bps and gone on line Modem has detected carrier at 33600 bps and gone on line 145 MultiModemBA User Guide Note If the modem is used in MNP Reliable mode the following responses change 1R CONNECT RELIABLE 5R CONNECT 1200 RELIABLE 9R CONNECT 2400 RELIABLE 11R CONNECT 4800 RELIABLE 12R CONNECT 9600 RELIABLE 13R CONNECT 14400 RELIABLE 19R CONNECT 19200 RELIABLE 21R CONNECT 21600 RELIABLE 24R CONNECT 24000 RELIABLE 26R CONNECT 26400 RELIABLE 28R CONNECT 28800 RELIABLE 31R CONNECT 31200 RELIABLE 33R CONNECT 33600 RELIABLE Note If modem is used in LAP M reliable mode the following responses change 1L CONNECT LAPM 5L CONNECT 1200 LAPM 9L CONNECT 2400 LAPM 10L CONNECT 4800 LAPM 12L CONNECT 9600 LAPM 13L CONNECT 14400 LAPM 19L CONNECT 19200 LAPM 21L CONNECT 21600 LAPM 24L CONNECT 24000 LAPM 26L CONNECT 26400 LAPM 28L CONNECT 28800 LAPM 31L CONNECT 31200 LAPM 33L CONNECT 33600 LAPM Note 1 If the modem is used with data compression the word COMPRESSED or the letter C is added to result codes Note 2 If the Standard AT Command Set 2400 responses are selected with the amp Q command the following responses change 9 not used 10 CONNECT 2400 Modem has detected carrier at 2400 bps and gone on line 2834 Series only 1
158. ords have exchanged Defines the number of Callback attempts after initial passwords have exchanged between modems Defines length of break time space to PC Sets DSR CTS CD dropout time Default 20 equals one second Sets DTR dropout time 0 default equals 50 mSec Specifies number of failed password attempts allowed 143 MultiModemBA User Guide 144 Specifies the amount of idle time can elapse between AT commands after the SETUP password has been entered Inactivity timer used to disconnect modem Sets time that modem waits for a RETURN to be entered during escape Buffer size for number of characters in AT command string after on line escape sequence before buffer is cleared and escape sequence aborted S36 sets the time between DTR inactive and the modem going off hook busy out S37 sets the time allowed DTR active and the modem responding on hook not busy S48 sets maximum speed modem connects within scope of Enhanced V34 mode e g S48 21 means maximum connect speed is S REGISTER UNIT RANGE DEFAULT DESCRIPTION S29 1 1 255 20 S30 min 0 255 0 S32 100mSec 0 255 20 sequence execution S34 ASCII 0 60 10 36 1 second 0 255 0 S37 1second 0 255 5 848 N A 33 31 0 28 26 24 21 19 16 14 12 96 and 48 2834 Series only 21 6K This register is useful when line conditions will not support higher V34 speeds The default value is 0 which indicates a connection att
159. ormal approval expected at the next ITU meeting in Geneva The MultiModem also provides other prevalent data communications standards and includes dial backup with automatic lease line restoration adaptive protocol enhancing used in typical Unix8 batch file transfers and support for IBM s AS 400 and Windows environments How To Use This Manual This manual is divided into ten chapters While viewing in Acrobat ReaderTM you can click on blue text to jump to the section of the manual it references Red bold text indicates a hyperlink to the Internet If you have a Web browser active on your system click on these text links to open the browser and go to the referenced site The information contained in each chapter and appendix is as follows Chapter 1 Introduction and Description This chapter begins with a short introduction followed by a guide which you are now reading to the use of this manual There is a discussion about what components you can expect in your modem package We then provide a more detailed description of the modem including the modem s technical specifications Chapter 1 includes sections covering power LED indicators and a brief summary of PC board controls Chapter 9 covers switch settings more thoroughly Chapter 2 Installation and Connection Chapter 2 covers the procedure for connecting the modem to your computer and to the phone line Details are given supported by illustrations on the modem s back pane
160. osiensnuinsoiaieia iae 32 Load default configuration 30 Modem RE 29 Non Error Correction mode seeeeesseseeeeen 32 Reliable mode snosesnnnnnnnennnnnenneennnnnnneennn nnn 32 Reuler 12 COmMpUSEVE EE 28 29 32 CompuServe lInternet AA 121 Computer or Terminal Initiated Flow Control Pacin 69 EEN DEELER tege cho iude mens 15 Continuous Redial Aor eiiis 49 Elle 15 GTS Control QR ossi nement 61 ER TE 31 CTS RTS Interaction Control amp RF 62 ET 29 D Data Carrier Detect nnnnnnnsneneneeeee eer nnnn neee 157 Data Compression sseeessss 13 32 Data Compression Commands 69 Data Format hassan 12 Dala RAOS E E 12 Data Set e nine ins 157 Data Set Ready Control amp S 61 Data Terminal Ready aseseeseeeeeeeeeeeneeeeeenn 158 Data Terminal Ready Control amp D 61 Datacomm software 28 29 30 31 32 124 CONNAN esnan 29 31 dB Transmission Levels 110 Delayed and Forbidden Numbers 147 BA 15 Dial D S ne Ne 49 Dial Phone Number Provided CRN Command150 Dial Pulse and Tone Dial Frequencies 130 163 MultiModemBA User Guide Dialing a Stored Number N 49 Dialing On Line Answering 28 Digital Loopback Test
161. out feature uses S Register S36 to set the time between DTR inactive low and the modem going off hook S36 can be set in one second intervals from 0 to 255 seconds With the default setting of 53620 DTR Busy Out is disabled i e DTR won t Busy Out Time Between DTR Active and Modem On Hook Unit Range Default Description S48 1 Second 0 255 seconds 5 S37 sets the time between DTR being active and the modem going on hook not busy S37 will only function in conjunction with S36 Program V 34bis Connect Speeds 2834 Series only Unit Range Default Description N A 33 31 28 26 24 21 19 16 14 12 96 and 48 0 Defines which speed modem connects within the scope of Enhanced V 34 mode e g S48 26 means maximum connect speed is 26 4K This register compensates for line conditions that have trouble supporting higher Enhanced V 34 speeds e g 33 6K 31 2K 28 8K 26 4K 24K The modem default is a value of 0 which indicates a connection attempt of 33 6K 83 MultiModemBA User Guide 6 2 84 Reading and Assigning S Register Values The S command is used to assign a value to and to read the current value of an S Register To read an S Register value enter the letter S followed by the S register number and a question mark then hit RETURN For example entering ATS7 and hitting RETURN displays the value of S Register S7 in a 3 digit decimal form The number 8 would appear as 008 the numb
162. p 2 Local Manual ssssssseeeeneneenene nnns 100 8 4 Digital Loopback Test V 54 Loop 2 Remote Automatic sseesssssssssseeene ens 101 8 5 BAC eis Baok TESE My 102 8 6 leie feele E e EE 103 8 7 Local Analog Loopback Test Synchronous Mode sssssssssseeeeeeee eene 103 8 8 Digital Loopback Test Local Manual Synchronous Mode sssssene 104 8 9 Digital Loopback Test Remote Automatic Synchronous Mode ssesssseesssesserresesrsssrrrssssee 105 Chapter 9 DIP Switch Settings 9 1 INTODUCHION e n 108 9 2 DIP Swiicli ODIO SOHUIIdS oae ucc ind dis tin EE E a eua bd cd aie M Re INT 109 9 3 speaker ever 115 9 4 Terre llegro Neits TE Le EE 115 Chapter 10 Warranty Service and Tech Support 10 1 ITO QUCTION e 118 ONE na re te ANA EE LEE LS E 118 10 2 On line Warranty E Ee E 118 E RE lee 119 10 3 1 Recording Modemi Information dard indiennes 119 TOA SENCE EP IT 119 10 5 The M li Tech BBS ss snrenenn inner N A cee ieee 120 1052 Upgrading theMult MOGSGR BT 121 105 3 Using FlashPro to Upgrade Modem Firmwares anan 121 10 6 About Multi Tech s Internet Presence is 121 10 7 JAboutthe Muki Tech Fax Back Service trades erecto Lone nine tuent ana 121 10 9 About OrndernmdACGeSSOFlBS uui eerie titre nan nant amet ioe 122 Appendixes Appendix A Troubleshooting tournoi
163. pback Test Switch 9 UP Remote Digital Loopback Test Switch 9 DOWN Factory Default Setting DOWN Switch 10 Leased Line Dial Up Operation DDD Asynchronous Synchronous Mode Leased Line Dial Up The modem operates in either leased line or dial up modes This switch controls leased line dial up operation Place DIP Switch 10 in the UP position for Dial Up operation Place DIP Switch 10 in the DOWN position for Leased Line operation Dial Up Operation Switch 10 UP Leased Line Operation Switch 10 DOWN Factory Default Setting B UP Chapter 9 DIP Switch Settings Switch 11 AT Responses Multi Tech Responses Asynchronous Mode Leased line Dial Up In Asynchronous mode you can set the modem to respond with Result Codes according to the Multi Tech command response set Switch 11 in the DOWN position or to AT command response set Switch 11 in the UP position The amp Q command performs the same function choosing AT or Multi Tech Result Codes and is explained further in Section 5 3 of this manual AT Responses amp Q1 Switch 11 UP Multi Tech Responses amp Q0 Switch 11 DOWN Factory Default Setting DOWN Switch 11 Internal External Clocking Synchronous Mode Leased Line Dial Up In Synchronous mode the transmit clock can be supplied by the DTE on pin 24 of the RS 232C V 24 interface by placing DIP Switch 11 UP Place DIP Switch 11 in the DOWN position to enable DCE to control clocking in
164. r computer to modem connection In Digital Loopback Test local manual mode data passed from the remote modem s transmit circuit are looped back from the local modem and are received at the remote modem s receive circuit multiple upper case U characters in Figure 8 6 First make certain that you are set up for Synchronous operation by placing DIP Switch 12 in the UP position To initiate the Digital Loopback Test local manual DIP Switch 9 must be in the UP position and the Answer Originate switch front of the modem must be toggled to the UP position Once you receive an OK message from your modem if responses are enabled the local modem is placed in Digital Loopback mode To exit the Digital Loopback Test local manual toggle the Answ Orig switch to the Answer position UUUUU UUUUU Digital Analog Analog Digital Computer or Terminal Local MultiModem Remote MultiModem Computer or Terminal DIP Switch 9 UP Answ Orig Switch Toggled to Answ position when On line Figure 8 6 Synchronous Mode Digital Loopback Test local manual 8 9 Chapter 8 Modem Testing Digital Loopback Test Remote Automatic Synchronous Mode This test must be run when you have a data connection with another modem In this test data is passed to the remote modem and is looped back to the local modem as if an ATU2 command was issued in Asynchronous test mode as shown in Figure 8 7 This lets you test the local and remote m
165. r modem in Analog Loopback mode in the Originate mode The modem is now out of the Command mode and in a pseudo On Line mode 3 Once you receive a connect message if responses are enabled enter data from your keyboard For this test typing multiple upper case U characters is a good way to send an alternating test pattern of ones and zeros 4 Fora more complete test you should also test the modem in Answer mode To do this you must escape from Originate mode by entering an Escape Sequence AT lt CR gt or BREAK AT CH Then type ATU1 and hit ENTER to place the modem in Analog Loopback mode in the Answer mode Then repeat step 3 5 When testing is completed you may exit Answer mode by entering an Escape Sequence AT lt CR gt or lt BREAK gt AT lt CR gt which returns the modem to Command mode 6 Your modem passes this test if the data entered from your keyboard is the same as the data received on your monitor If different data is appearing on your monitor your modem is probably causing the problem although it could also be your computer If your modem passes this test but you are receiving errors while On line the remote modem or the phone line could be at fault 99 MultiModemBA User Guide 8 3 Digital Loopback Test V 54 Loop 2 Local Manual 100 In this test your modem must be On Line with another modem that can respond to a request for Digital Loopback such as another MultiModem The Digital Loopback
166. racters allowed after AT CR is defined by S Register S34 S Register S34 defaults to ten command characters When this is done the modem escapes to Command Mode executes the command if any and then remain in Command mode For example to hang up the modem at the end of a call enter ATH and hit RETURN There is no need to incorporate pauses before and after the plus signs as done in earlier modems BREAK AT lt CR gt The modem provides an alternative Escape method using a Break signal as the Escape Code The Break signal allows the start stop DTE data terminal equipment to signal the modem without loss of character transparency With this method a BREAK signal is used instead of the three plus signs The BREAK is followed by the letters A and T up to 60 command characters and RETURN When this is done the modem executes that command but remains in On Line mode unless the command was to hang up and or reset the modem an H or Z in which case the modem would be in the Command Mode after executing that command Escape Sequence Options Entering Command Mode While On Line E As mentioned the default escape sequence setting is for the modem to respond to the escape method Optional settings are for the modem to respond to the Break method for the modem to respond to either the or the Break Methods for the modem to ignore both methods and not escape for the modem to respond with no OK to and for the modem t
167. rameters The default values for the other parameters in modem configuration menus rarely need changing They typically include the dialing prefix ATDT for touch tone service and ATDP for rotary service the dialing suffix M the hang up string ATHO4M and response messages RING NO CARRIER BUSY etc Communications software with a host mode might also include an auto answer string AT SO 14M 3 5 3 6 Chapter 3 Software Configuration Macintosh Initialization Macintosh computers cannot use RTS CTS hardware flow control without a serial cable wired for hardware control The Macintosh 128 and 512 models cannot use RTS CTS flow control at all For those Macintoshes turn off the default RTS CTS hardware flow control turn on XON XOFF flow control and pacing and ignore DTR AT amp F X4 amp E5 amp E13 amp D0 M For hardware flow control use the following initialization string AT amp F X4 amp E13 amp D0 M Add S0 0 to both strings to disable auto answer if the modem is on a voice line You can store the initialization string in nonvolatile memory With your communications software open and connected to the modem s COM port type the initialization string in the terminal window substituting a carriage return for M To store the string enter AT amp F9 amp WO0 CR Now you can initialize your modem with the following simple string AT Z M Configuring Software for Your Computer You must configure your
168. rd Attempts 0esseeeseeeeeee 95 SE s TN 59 Fallback Modes When On Line F 59 FAX T 30 Fax and Communications Software Won t Run 128 Fax Carrier Frequencies 14 estere Ui Melo 13 Fax Back Service sssssessssesessnnresenrnnnnnnnrnn nnn 121 File transfer protocols roni retient 32 Flash Om HOOK ls ss nee 51 FlashPro to Upgrade Modem Firmware 121 FOW COMTO sense 109 FIOW COMTO EE 31 128 Flow Control amp E4 amp E5 eessssss 109 Force Answer Mode A 75 Forced DTR Le batte eed 109 Frequency StabilitW scrunch 14 guerre 124 FUNCTIONAL DESCRIPTION OF RS232C SIG 164 NAL 2 157 Functional States sn 7 09 bebe ruines 43 G Garbage Characters 128 Guard TONES GG uio ters tetra mnt 58 H Hardware Flow Control amp E4 66 Help Screens DE scenic ancien 73 HOW TO T M E e ell IA 44 l Immediate Action Line Probe Commands 75 Inactivity FIM nine 82 INAICAOrS E 15 Initialization strings 29 30 31 32 124 126 MACINTOSH ccrte aae trottoir decus 31 PG compatible hisser nimes 30 initiating Line Probe senindir 75 Intelligent Features 13 Intelligent Serial Interface ISI 72 nisle assiste M 15 Internal External Clocking 113 L L
169. remote automatic with the ATU2 command which automatically places the remote modem in digital loopback mode Data from your computer or terminal are transmitted through your modem and over the phone line to the remote modem where they are then looped back to your modem See Figure 8 3 The test procedure is as follows 1 Gointo Terminal mode Type AT and hit ENTER you should get an OK message 2 Dialthe remote modem by entering the Dial command and the phone number to establish On line mode Note The amp T4 command must be set on the remote modem to run this test UUUUU UUUUU Digital Analog Analog Digital Computer or Terminal Local MultiModem Remote MultiModem Computer or Terminal Figure 8 3 Digital Loopback Test remote automatic 3 Type the Escape Sequence AT lt CR gt or lt BREAK gt AT lt CR gt which brings your modem into Command mode while still maintaining the connection with the remote modem 4 Type ATU2 and hit ENTER The local modem responds to this command by transmitting an unscrambled marking signal which causes the remote modem to place itself in Digital Loopback mode Then the local modem exits Command mode and enters pseudo On line mode 5 Type data from your keyboard For this test typing multiple upper case U characters is a good way to send an alternating test pattern of ones and zeros The data received by the remote modem will enter its analog receiver be converted to digi
170. ress If the modem reports NO DIALTONE check that the modem s telephone line cable is connected to both the modem s LINE jack not the PHONE jack and the telephone wall jack If the cable looks secure try replacing it If that doesn t work the problem may be in your building s telephone installation To test the building installation plug a telephone into your modem s telephone wall jack and listen for a dial tone If you hear a dial tone your modem may be installed behind a company phone system PBX with an internal dial tone that sounds different from the normal dial tone In that case the modem may not recognize the dial tone and may treat it as an error Check your PBX manual to see if you can change the internal dial tone if you can t change your modem s initialization string to replace X4 with X3 which will cause the modem to ignore dial tones If the modem reports BUSY the other number may be busy in which case you should try again later or it may indicate that you have failed to add a 9 prefix to the phone number if you must dial 9 for an outside line If you must dial 9to get an outside line the easiest way to dial it automatically is to include it in the modem s dial prefix e g ATDT9 Note the comma which inserts a pause before the number is dialed By inserting 9 into the dial prefix you do not have to include it in each directory entry in the terminal To change the dial prefix in Windows Terminal select Settin
171. ringSoftware for Your Mode Misiista ae a aa A A adeis 3 4 PC Initialization Sting S ebe ER 3 4 1 Changing Default Parameters sr 342 Other Parame lers scuto eL nace ene LINIEN UE ei 3 5 Macintosh Hl EE ei ss in ai einem Terr rer rr rte rere 3 6 Configuring Software tor Your COMp te s essai sen men EEE 3 6 4 X Configuring Software for the Remote System 3 6 2 Terminal EMUIANON 2 ette ee S 0 62 File Mansion e 3 7 When to Disable Data Compression scies ntm tee a a a duda Base 37a Disabling Error GOITecllon u uiae cocer aa E 3 8 Modem BASIC Suiriri Em EE Wiel ele Ee EE 3 9 The Answer Originate Voice Data Toggle Switch essssssssssssseeeee nennen 20 25 28 29 Chapter 4 Manual Dial and Automatic Answer 4 1 duse ctr 36 4 2 DJialing OnsEine AnsWeFllg ooo deco ub irri ae eE SE i dames eo anne ned Near attest e ne 36 4 3 Mantial Call ONOINANOM ee 37 4 4 Automatic Answering epe EE 37 4 5 jure LATS WG TUNG me RC m 38 4 6 Handshaking Detalls Em 38 4 7 TM Gale NO A ee 39 Chapter 5 Command Mode 5 1 NTPOGU CHOI Reime m 42 bs RE elen Iesele WEE 42 1 2 Functional Modes E 43 5 2 Summary of AT GOMMANAS E 44 5 3 Result Codes recreirai ana A E ee lame ace 47 5 4 Dialing COMMANAS dedos tenseur dit mnt nn 49 5 44 DBialing Action Commands sion ne Rd iso ME Orb OL INED les REG 49 5 4 2 Dial Modifier Command EE 50 543 Phone Number Memory Command Sisirain R a ANENA 53 5 4 4 Configuration and Defa
172. running under Windows 3 1 and have a 16550AFN UART you must replace the Windows serial driver COMM DRV to take full advantage of the UART s speed If you are using a slow transfer protocol such as Xmodem or Kermit try Zmodem or Ymodem G instead Is your line noisy If there is static on your line the modem has to re send many blocks of data to insure accuracy You must have a clean line for maximum speed Are you downloading a compressed file with MNP 5 hardware compression enabled Since hardware data compression cannot compress a file already compressed by an archiving program the transfer can be marginally slower with data compression enabled than with it disabled Try entering the L8 List Online Diagnostics command in on line mode making a screen print of the diagnostics listing and checking for parameters that may be unacceptable number of retrains round trip delay etc 127 MultiModemBA User Guide 128 I Am Losing Data If you are using data compression and a high speed serial port set the serial port baud rate to four times the data rate Your UART may not be reliable at serial port speeds over 9600 bps or 19 200 bps Turn off data compression reset your serial port speed to a lower rate or replace your serial port with a faster one Make sure the flow control method you selected in software matches the method selected in the modem If you have a Macintosh you may have the wrong cable for hardware flow contr
173. s 3 Never touch uninsulated telephone wires or terminals unless the telephone line has been disconnected at the network interface Use caution when installing or modifying telephone lines 5 Avoid using a telephone other than a cordless type during an electrical storm There may be a remote risk of electrical shock from lightning 6 Do not use the telephone to report a gas leak in the vicinity of the leak Ports which are connecting to other apparatus are defined as SELV To ensure conformity with EN 41003 ensure that these ports are only connected to the same type on other apparatus 2 2 2 Installation Procedure The following procedures will guide you through the physical connections required to make your modem operational Software loading is covered later in this guide Step Procedure 1 Verify that the settings for DIP Switch 5 and DIP Switch 10 match those of your system configuration The 16 position DIP Switch numbered 1 16 is accessible through a cut out on the right side as the LEDs are facing you of the modem chassis For a full description of all DIP Switch Settings refer to Chapter 9 DIP Switch Condition Effect 5 UP Selects Answer mode DOWN Selects Originate mode 10 UP Selects Dial Up operation DOWN Selects Lease Line operation indicates Factory Default setting 2 Verify that the ON OFF switch at the rear of the modem to the OFF Down position 3 Connect the modem to a dial up line by attaching
174. s 932 Series Data Rates modem 2834 Series 1432 Series 932 Series Data Rates fax 2834 and 1432 Series 932 Series Data Format 2834 Series 1432 Series 932 Series Compatibility 2834 Series 1432 Series 932 Series Error Correction All models MultiModem T MT2834BA MT2834BAI MT2834BA MAC MT1432BA MT1432BAI MT1432BA MAC MT932BA MT932BAI MT932BA MAC 33 600 31 200 28 800 26 400 24 000 21 600 19 200 16 800 14 400 12 000 9600 7200 4800 2400 1200 0 300 bps 14 400 12 000 9600 7200 4800 2400 1200 0 300 bps 9600 7200 4800 2400 1200 0 300 bps 14 400 9600 7200 4800 bps 9600 7200 4800 bps Serial binary asynchronous at 0 300 1200 2400 4800 7200 9600 12 000 14 400 16 800 19 200 21 600 24 000 26 400 28 800 31 200 33 600 bps synchronous at 1200 2400 4800 7200 9600 12 000 14 400 16 800 19 200 21 600 24 000 26 400 28 800 31 200 33 600 bps Serial binary asynchronous at 0 300 1200 2400 4800 7200 9600 12 000 14 400 bps synchronous at 1200 2400 4800 7200 9600 12 000 14 400 bps Serial binary asynchronous at 0 300 1200 2400 4800 7200 9600 bps synchronous at 1200 2400 4800 7200 9600 bps ITU V 42bis V 42 Pending ITU Enhanced V 34 approval ITU V 34 AT amp T V 32terbo ITU V 32bis V 32 V 21 V 22bis V 22 V 23 V 25bis Bell 212A and 103 113 ITU V 17 Group 3 T 4 T 30 and EIA TR 29 Class 2 Bell 212A a
175. s displayed Installation Complete Application Successfully Installed The application has been succesfully installed and configured on your system Y ou can now fax anything you can print directly from Simply select Datafax as your printer and print Launch an application such as Windows Write and try it 17 Click OK Exit the Installation Program The Trio Applications program group is displayed ES Trio Applications i P X File Edit dieu Help IF Voice Uninstall 3 object s 118KB 7 Your Trio software is loaded If you wish to begin using Trio right away double click on the Trio DataFax Voice icon Refer to the Release Notes for instructions To quit Trio altogether close the Trio Applications program group and then click the Exit 3 icon on the installation screen to exit the installation program Is Your Modem Ready for Use As soon as you have connected power to the modem if you are an experienced modem user you may simply want to check your modem s settings for data compression error correction and so on You may find that you can get moving quite quickly if you just issue an ATL5 ATL6 and an ATL7 command These commands list how your modem is currently configured If you come across a setting you re unsure of refer to Chapter 5 and Chapter 6 for AT command and S Register explanations and defaults If you re a novice refer to Chapter 3 to learn about the basics of d
176. scription S5 defines the character recognized as BACKSPACE S5 may be set for any ASCII character S6 Wait Time for Dial Tone Unit 1 second Range 2 255 4 255 Default 2 4 Description S6 sets the time the modem waits after the RETURN key is pressed before executing a dial command The default setting is two seconds Decimal 2 S7 Time for Carrier Abort Timer Unit 1 second Range 1 255 1 45 Default 45 Description S7 defines the Abort Timer lack of carrier delay time The default value is 45 seconds Decimal 45 This means that after dialing the modem waits for a carrier signal for up to 45 seconds and if none is detected aborts the call The maximum S7 value is 255 S8 Pause Time for Comma Unit 1 second Range 0 255 4 255 Default 2 4 Description S8 sets the length of the pause caused by a comma inserted in a dialing command The default setting is two seconds or two units Decimal 2 or four seconds where each unit is one second S8 may be set for up to 255 seconds S8 also sets the time the modem waits before retrying a call after detecting a busy signal Some computer systems need more than two seconds to reset in which case you should increase the value of S8 Value for International and DOC units Value for International units only 79 MultiModemBA User Guide 80 S9 Carrier Detect Response Time Unit Range Default Description S10 100 mSec 1 255 6 S
177. sed by the remote computer To be compatible with the remote computer your software must be able to substitute the appropriate codes in what is known as terminal emulation Most communications programs can emulate the most common mainframe terminals including the DEC VT100 VT102 and VT52 terminals and the basic TTY mode If in doubt about which to choose for a BBS try ANSI or VT100 first 31 MultiModemBA User Guide 3 7 32 3 6 3 File Transfer Protocols When you upload or download files with your modem the host computer will ask which file transfer protocol you want to use Most communications programs allow you to choose a default protocol Your software s documentation should list the ones it can use not all communications programs support all protocols Zmodem is the recommended protocol for most transfers When to Disable Data Compression If your serial port cannot keep up because it has an older UART you may lose data when using data compression Also the speed advantage hardware compression gives you is entirely dependent on how much the data being transmitted can be compressed If the data is already in compressed form a ZIP or a SIT file for example trying to compress it more will actually slow the transmission slightly compared to transmitting the same file with compression disabled This effect will be most noticeable if your modem negotiates MNP 5 compression with the other modem V 42bis will not try to further
178. seful because it allows the modem to immediately abandon a call rather than wait 45 seconds for a carrier signal that will never come S Register S7 defines the wait for carrier time refer to Chapter 6 The modem gives you a choice between the wait for dial tone smart method we just described and blind dumb dialing where instead of detecting actual dial tones the modem relies on timed pauses When the wait for dial tone method is chosen the busy signal detection capability is also activated The X command is also used to select which dialing method is used Five different X commands are available XO through X4 with five different effects on the modem s Result Codes XO Provides the basic short result codes and provides dumb dial capabilities X1 Provides the extended result codes and provides dumb dial capabilities The remaining X commands affect Call Progress and turn on Extended Result Codes X2 Looks for dial tone only and will not provide a busy response X3 Looks for busy only and not look for dial tone X4 Looks for dial tone and for busy The factory default setting is X0 which selects Basic Result Codes and the blind dumb method of dialing 57 MultiModemBA User Guide 58 5 4 6 Phone Line Conditioning Commands Guard Tones Not Used in BAI Models amp G The amp G command is used to control the presence or absence of guard tones from the transmitter when in Answer mode at either 1200 or
179. serial port communications over 2400 bps though most users can work up to 9600 bps without problems Other activities that could cause the serial driver to drop bits at high speeds include the floppy disk driver formatting a disk the CPU paging in or out in virtual memory mode and the Mac llci or lei running the on board video in 8 bit mode Therefore for maximum communications speed on the Macintosh we recommend as few concurrent activities as possible To use V 42bis compression at 19 200 bps or faster we recommend that you install a high speed serial port card Newer Macintosh computers such as the Quadra and Centris models support serial port speeds up to 115 200 bps 3 2 1 How Can You Identify Your UART Type If you have MS DOS 6 0 or later you can find your UART type from a diagnostic program called MSD To use it type MSD at the DOS prompt After the opening screen select COM Ports The last line of the report tells you what type UART you have for each COM port MSD does not distinguish between the 8250 and the 8250A However if you have an IBM AT or newer computer you likely have an 8250A or 16450 UART installed both of which are reliable to 19 200 bps If you would like more detailed information about your UART than MSD can provide you can download shareware UART identification programs from the IBM Communications Forum on CompuServe or from a local BBS 3 3 Chapter 3 Software Configuration 3 2 2 The 16550 UART and Wi
180. sword retry You must enter the requested information correctly within one minute or the Callback modem will hang up When the information is entered properly the called modem will hang up and after a 15 second delay call you back When your modem answers the dialback modem will respond with the following Password 4 Enter the modem s LOGIN Password again the same as in Step 1 The Callback modem responds with CONNECT You are now in Data Mode 91 MultiModemBA User Guide 92 7 3 2 Remote Configuration Procedures The procedures for using the Remote Configuration features are the same whether or not a call originates from the remote modem Once the modem is on line perform the procedures in Table 7 4 Table 7 4 Remote Configuration Operation Procedures Step Procedure 1 Remote Escape Configuration requires 969696AT CR to be sent if the default value in S Register S13 has not been changed The modem responds with 1 DATA Mode 2 COMMAND Mode 2 Youthen select 1 or 2 With 1 the modem goes back into data mode and with 2 the modem responds with the following Password 3 Enter your Setup Password and if the code is correct the modem responds with OK You can now use any AT commands of the modem being remotely configured as if they were being entered locally You cannot change the setup of the LOGIN Password until you enter the proper LOGIN Password 4 When you are done entering AT commands and you wan
181. t calls is a V 42 modem involves the use of a Link Request When the modem is in Auto Reliable mode and originates a call it goes through normal handshaking procedures just like any dial up modem After establishing the on line connection the modem transmits a Link Request message to the answering modem The Link Request message is generally about 33 coded characters If the answering modem replies with an appropriate V 42 acknowledgment response the modem switches into Reliable mode Otherwise it stays in Normal mode This V 42 Link Request handshaking procedure generally takes about five seconds When operating in V 42 Reliable mode the modem uses its memory or buffer to store data as it is received During periods of error caused retransmissions or compression slowdowns this buffer may fill up To prevent buffer overflow and subsequent loss of data the modem uses flow control to signal the computer attached to its RS 232C port that the modem buffer is close to being full This causes the computer to pause in its data transmission until the modem is able to empty its buffer sufficiently to accept more data at which time the modem signals the computer that it may resume transmission Flow Control is discussed in Section 5 4 9 Reliable Mode amp E2 In Reliable mode the modem uses its V 42 error correction capabilities during all transmissions and must be connected to another modem with a similar protocol activated MNP or LAP M
182. t to exit type ATO and hit RETURN The modem responds with 1 DATA Mode 2 COMMAND Mode 5 Entera 1 to go back on line with your computer or enter 2 and the correct password to talk to your modem 7 4 Chapter 7 Callback Security and Remote Configuration Remote Configuration and Callback Security AT Commands The following AT commands are used with Remote Configuration and Callback Security features Assign Passwords for Callback Phone Numbers CBN When you have callback security enabled for the modem anyone trying to connect with the modem will be required to furnish a password The ZCBN command allows you to enter passwords for each of the 30 memory locations used for callback security The length of each password can be up to 10 characters but must be at least 6 characters Any ASCII character can be used The format for this command is ATZCBNyyxxxxxxxx CR with xxxxxxxx representing the password and yy being the memory location 0 29 Each callback password xxxxxxxx must start with a non numeric character Callback Security Enable Disable DB The purpose of this command is to enable or disable default setting your modem s callback security option Once this command is executed you modem will undergo some significant changes For example the phone number memory locations NO through N9 will be used for passwords and phone numbers In other words you will not be able to dial from memory or use the DTR dialing feat
183. t using error correction Xon Xoff can be used to control the flow of data between the modems Flow Control can be turned on or off with the Normal Mode Modem Flow Control commands When the modems are connected in Reliable mode a different method of modem Flow Control is used and the commands for Normal Mode Modem Flow Control are ignored When you are using Speed Conversion in Normal Mode you must activate the modem s Normal Mode Modem Flow Control Speed Conversion is explained in Section 5 4 11 Send Xon Xoff Characters X The X phone interface command allows the modem to send either a single or multiple Xoff characters at the modem s buffer full level When the modem s buffer reaches it s buffer full level the next character received causes another Xoff to be sent for every character subsequently received by the modem The AT X0 command factory default setting causes one Xoff to be sent until the buffer reaches the Xon level The AT X1 command causes an Xoff to be sent for every character received after the modem reaches its buffer full level Hewlett Packard ENQ ACK Pacing amp E9 If the modem is being used with Hewlett Packard or similar equipment that employs ENQ ACK pacing the modem can be configured to respond to ENQ ACK commands making it compatible with HP systems Doing so does not affect any other flow control or pacing already configured in the modem When configured for ENQ ACK the ENQ Control E and ACK
184. tal data be reconverted into analog and then looped through its transmitter back to the local modem Your modem passes this test if the data entered from the local keyboard is the same as the data received on your monitor 101 MultiModemBA User Guide 8 5 Back to Back Test This test lets you connect two MultiModems with an RJ 11 cable to verify proper operation Using a modem that is known to be operational you can test a second modem that is suspect 1 2 3 9 102 Plug the modular ends of an RJ 11 cable into both MultiModem s LEASE jack connectors Force DTR ON in both local and remote modems Switch 1 DOWN Enter the command AT SB9600 BA0 amp W0 lt CR gt on both local and remote modems This sets the serial speed to 9600bps Make sure that the terminal computer is set for 9600 bps Set both modems in Leased Line mode DIP Switch 10 DOWN Set one modem to Answer enabled DIP Switch 5 UP and the other modem to Originate enabled DIP Switch 5 DOWN Note it does not matter which modem local remote is set to Answer Originate just so they are set opposite Set DIP Switch 3 UP on both local and remote modems This changes the transmit level to 15dB and this change is necessary to operate in back to back mode Turn on both units and wait for carrier detect CD Short out pins 2 and 3 on the RS 232C interface on the remote modem i e with a paper clip or some other metal device Remote Site Short Pins 42 an
185. tch 13 DN and Switch 14 DN Factory Default Setting Switch 13 UP and Switch 14 UP 113 MultiModemBA User Guide 1432 Series 14400 bps Operation Switch 13 UP and Switch 14 UP 9600 bps Operation Switch 13 DN and Switch 14 UP 4800 bps Operation Switch 13 UP and Switch 14 DN 2400 bps Operation Switch 13 DN and Switch 14 DN Factory Default Setting Switch 13 UP and Switch 14 UP 932 Series 9600 bps Operation Switch 13 UP and Switch 14 UP 4800 bps Operation Switch 13 DN and Switch 14 UP 2400 bps Operation Switch 13 UP and Switch 14 DN 1200 bps Operation Switch 13 DN and Switch 14 DN Factory Default Setting Switch 13 UP and Switch 14 UP Switch 15 Carrier Detect DSR Forcing DSR Asynchronous Synchronous Mode Dial Up Leased Line Some terminals react in unusual ways to the toggling of the Carrier Detect CD RS 232C V 24 pin 6 signals The most common symptom is that the modem does not respond to commands or does not echo characters In these cases it is advisable to force these two signals On in order for the terminal to communicate properly with the modem in Command mode This is done by setting DIP Switch 15 DOWN With DIP Switch 15 in the UP position both CD and DSR will be either on or off depending on the On Line status CD and DSR normal Switch 15 UP CD and DSR forced On Switch 15 DOWN Factory Default Setting UP Switch 16 Reserved for Future Use 114 9 3 9
186. ternal clock via pins 15 and 17 of the RS 232 V 24 interface External Clock pin 24 Switch 11 UP Internal Clock pins 15 17 Switch 11 DOWN Factory Default Setting DOWN Switch 12 Asynchronous Synchronous Operation Sync Asynchronous Synchronous Mode Leased Line Dial Up The modem can operate in either Asynchronous mode or Synchronous mode In Synchronous mode start and stop bits are eliminated The modem s internal clock circuits on the RS 232C V 24 pins 15 and 17 are activated The modem s Command mode is not accessible in Synchronous mode This switch is a means to alternate and to access either mode In Synchronous mode you may want to set the RTS forcing and CTS forcing DIP Switches so that both of signals act normally not forced on Synchronous Operation Switch 12 UP Asynchronous Operation B Switch 12 DOWN Factory Default Setting DOWN Switches 13 and 14 Speed Switches Synchronous Mode Leased Line DIP Switches 13 and 14 are used to set the modem s data transmission rate Switches 13 and 14 are used in combination typically in leased line and call origination applications Note The modem baud rate command MBn overrides the setting of these speed selection switches DIP switches 13 and 14 2834 Series 28800 bps Operation Switch 13 UP and Switch 14 UP 19200 bps Operation Switch 13 DN and Switch 14 UP 14400 bps Operation Switch 13 UP and Switch 14 DN 9600 bps Operation Swi
187. tetto reete Deananheeenneasnbhgnene SEAE ENES 124 Appendix B ASCII Character Code Hex Decimal Conversion Chart 129 Appendix C Dial Pulse and Tone Dial Fredquencies orti certos ceterae eere a aar t ene DEEN 130 Appendix D Command Eu EE 131 Appendix E DIP Switeh SUmMary EE 140 Appendix F S R gist r SUMMAV EE 143 Appendix G Result Code Summarf sisi a e a 145 Appendix H V250 EE 147 Appendix l MultiModemBA Cables eite aneinander atens pei 154 Appendix J RS 232C Interface Specifications ne 156 Appendix K Regulatory Information cena tenta NE 160 Index vi Multi Chapter 1 Introduction and Description Multi e Systems MultiModemBA User Guide 1 1 1 2 Introduction Welcome to the world of data communications You have acquired one of the finest intelligent desktop data fax modems available today the MultiModem BA series modem from Multi Tech Systems This User Guide covers various models within the BA series and unless otherwise noted all content should be considered relevant to all models Your MultiModem provides data communication at the following rates Model Baud Rate MT2834BA Series 33 600 14 400 bps Enhanced V 34 V 32bis MT1432BA Series 14 400 9 600 bps V 32bis V 32 MT932BA Series 9 600 300 bps V 32 Note enhancements on V 34 code 33 6K 31 2K is awaiting formal ITU approval the ITU study group 14 has agreed on the technical side of the proposal with f
188. th the characters you typed If the characters don t match check your computer s COM port setting then verify your communication software s configuration To initiate the Local Analog Loopback Test with the modem in Synchronous mode 1 Enter AT amp MTU This first switches your modem form asynchronous to synchronous mode and places it into the Analog Loopback Originate mode The modem is now out of the Command mode and in the pseudo On Line mode 2 Once you receive a connect message if responses are enabled enter data from your keyboard For this test typing multiple upper case U characters is a good way to send an alternating test pattern of ones and zeros 3 Fora more complete test you should also test the modem in Answer mode To do this Type the Escape Sequence AT lt CR gt or BREAK AT CH which brings your modem into Command mode while still maintaining the connection Then type AT amp M1U1 and hit ENTER to place the modem in Analog Loopback mode in the Answer mode Then repeat step 2 UUUUU UUUUU Digital Analog Computer or Terminal Local MultiModem Figure 8 5 Synchronous Mode Local Analog Loopback Test 103 MultiModemBA User Guide 8 8 104 Digital Loopback Test Local Manual Synchronous Mode This test must be run when you have a data connection with another modem If a Local Analog Loopback Test resulted in errors and this test passes without errors then the problem exists in you
189. the Q command ATQ 1 disables Result Code transmissions ATQO or ATQ enables Result Code transmission Regarding No Response Answer you may want the answer mode handled without responses and echo turned off but want the originate mode still intelligent This is called the No Response Answer mode ATQ2 selects the No Response Answer mode If you do not select any mode the factory default setting enable Result Codes is automatically selected Result Codes Multi Tech or Standard AT amp Q The modem gives you a choice between the Multi Tech Result Codes and Result Codes that more closely match the standard AT command set responses see Section 5 3 AT amp Q1 selects AT responses with no Reliable Compression modifiers With this command the terse result code for CONNECT 2400 is 10 AT amp QO selects Multi Tech responses with Reliable Compression modifiers With this command the terse result code for CONNECT 2400 is 9 Result Codes Verbose Terse V The V command controls whether the modem s result codes are displayed as word verbose or single digit terse messages For example if after dialing no carrier signal is detected the resulting message can be displayed either as NO CARRIER or as the digit 3 Entering ATVO or ATV causes the modem to display the Result Codes as digits while ATV1 displays them as words If you do not select a method the factory default setting causes the modem to display Result Codes as
190. the RJ 11 telephone cord provided with your unit to the LINE connector on the modem and to a dial up wall jack Refer to Figure 2 2 21 MultiModemBA User Guide 22 LINE EIA RS232C e VOLUME Figure 2 2 MultiModemBA BAI Connections Attach the EIA RS 232C connector on the modem to the serial port on your computer or terminal with an RS 232 or V 24 cable you supply Refer to Figure 2 2 To connect a telephone set to the modem optional plug one end of an RJ 11 phone cord into the PHONE connector on the modem and plug the other end into your telephone Refer to Figure 2 2 Attach the AC Power transformer provided with your unit to the POWER connector on the modem and to a live AC outlet Refer to Figure 2 2 Note Only apply power to the modem using the power transformer provided with your unit Use of a power supply not designed for your unit could result in damage to your modem and will void the warranty Apply power to the unit by setting the ON OFF switch at the rear of the modem to the ON Up position Refer to Figure 2 2 2 3 Chapter 2 Installation and Connection Loading Trio DataFAX Software The following procedure will guide you through the installation of Trio DataFAX software The procedure does not provide every screen or option in the process The installation utility provides on screen instructions for those elements that are not
191. tion of keyboard characters upper lower case sensitive between six and ten characters long 93 MultiModemBA User Guide Erase Callback Password RCBNxx This command erases the single callback password specified by xx 0 through 29 Erase Callback Phone Number RDNxx This command erases the single phone number specified by xx 0 through 29 94 7 5 Chapter 7 Callback Security and Remote Configuration Remote Configuration Callback Security S Registers The following S Registers are used with Remote Configuration and Callback Security features Remote Configuration Character S13 13 defines the modem s remote configuration escape character When the S13 character is entered three consecutive times from a remotely connected site your modem responds to it with its Remote Configuration procedure Units ASCII Range 0 127 Default 37 96 sign Callback Time Delay S15 15 defines the time delay for Callback attempts after initial passwords have been exchanged between modems Unit Seconds Range 10 255 Default 20 Callback Attempts S16 16 defines the number of Callback attempts after initial passwords have been exchanged between modems Unit 1 Attempt Range 1 255 Default 4 Failed Password Attempts S26 S26 counts the number of times there has been a failed password attempt For example if you entered ATS26 the message 003 would be displayed meaning someone has failed three times to gai
192. tly Appendix A Troubleshooting If you don t get an OK the problem may still be in the communications software Make sure you have done whatever is necessary in your software to make a port connection Not all communications programs connect to the COM port automatically Some connect when the software loads and remain connected until the program terminates Others can disconnect without exiting the program make sure the Connect icon looks plugged in If the terminal reports that it cannot make a connection yet the modem s TR indicator is on click on the Window menu to see if more than one terminal is open The modem s TR indicator shows that the software has made a connection with the modem through the COM port Your communications software settings may not match the physical port the modem is connected to The serial cable may be plugged into the wrong connector check your computer documentation to make sure Or you may have selected a COM port in your software other than the one the modem is physically connected to compare the settings in your software to the physical connection If the modem is on the cable is plugged into the correct port the communications software is configured correctly and you still don t get an OK the fault may be in the serial cable Make sure it is firmly connected at both ends Is this the first time you have used the cable If so it may not be correct Check the cable description on the packaging to m
193. to control its error correction and data compression options These additional commands are listed below Remember to precede each command with the AT characters Normal Auto Reliable Reliable Mode Commands SEO Normal Mode amp E1 Auto Reliable Mode amp E2 Reliable Mode Modem Initiated Flow Control Commands amp E3 Disables flow control no flow control amp E4 Hardware flow control CTS on off and RTS on off amp E5 Xon Xoff flow control Xon Xoff Pass Through Commands amp E6 Modem responds to Xon Xoff characters but does not allow Xon Xoff characters to pass through to remote site amp E7 Modem responds to Xon Xoff characters and allows them to pass through to remote site X0 Selects single Xoff character until Xon level returns X1 Selects multiple Xoff characters after buffer levels is full Enq Ack Pacing Commands SES Enq Ack method of pacing oft amp E9 Enqg Ack method of pacing on Normal Mode Modem Flow Control Commands amp E10 Normal Mode Modem Flow Control off SEIT Normal Mode Modem Flow Control Xon Xoff on Computer or Terminal Initiated Flow Control Pacing Commands amp E12 Pacing off amp E13 Pacing on either RTS on off or Xon Xoff depending on the setting of SEA or amp E5 Data Compression Commands amp E14 Data Compression disabled amp E15 Data Compression enabled Factory Default setting 69 MultiModemBA User Guide 70 5 4 14 Spe
194. to the UARTs above those speeds the UARTs may not be able to process the data fast enough to keep from losing some of it The 16550AFN however can safely handle data to 115 200 bps When a modem communicates with V 42bis 4 to 1 compression enabled it sends up to four times as much uncompressed data to the serial port as it receives compressed over the telephone line Therefore a modem communicating at 14 400 bps may require a serial port that can reliably transfer data at four times 14 400 bps or 57 600 bps at 19 200 bps it may require one that works reliably up to four times 19 200 bps or 76 800 bps and at 28 800 and 33 600 bps it may require one that works reliably up to a maximum of 115 200 bps If your serial port cannot handle these speeds we recommend that you replace your present serial card with one that has a 16550AFN UART or equivalent Macintosh computers do not use UARTs The Macintosh SE through Ilfx models use a Zilog 28530 chip called a Serial Communications Controller or SCC that has a maximum speed of 57 600 bps This speed can be compromised by other serial communications including printer transmissions and Appletalk the networking software that allows Macintoshes to share files When Appletalk is active it controls all serial communications on the Macintosh Because it gives priority to network communications it may lose modem data at higher transmission speeds Therefore when Appletalk is active you risk losing data on
195. tware If you send a command directly to the modem in terminal mode rather than indirectly through communications software you must end the command string by pressing the RETURN key CR instead of adding M to the string The following initialization string is for a MultiModem on a telephone line that functions solely as a DATA LINE AT amp F X4 S0 2 M 3 4 4 Changing Default Parameters By default the modem will answer after the first ring and try to communicate with a modem on the other end of the line If you have one telephone line for voice fax and modem communications the modem may attempt to answer all incoming calls voice as well as data To change auto answer to default off open your communications program and type the following string in the terminal window AT amp F S0 0 amp F9 amp W0 lt CR gt This string selects the factory default parameters then turns auto answer off and stores that setting along with all other current parameters in nonvolatile memory The amp F9 command causes the modem to load the values from nonvolatile memory the next time it receives the amp F command You will use the same initialization string as before AT amp F X4 M But now the modem will load the values stored in nonvolatile memory when you turn on the modem and when you issue the ATZ or AT amp F reset commands Note Because it clears the command buffer you should not use ATZ in an initialization string 3 4 2 Other Pa
196. u would both then hang up your telephone handsets and continue the conversation via your keyboards Handshaking Details This section briefly explains what happens between two modems in a normal call We are assuming that there are MultiModems at both the originating and at the answering end of the telephone line If other brands of modems are used with our modems they will still communicate but each manufacturer tends to use slightly different delay timings and sequences and many of the brands vary in their LED designations When a call is dialed from the originating modem the called modem responds to the ringing by switching into Answer mode and by turning on its RI Ring Indicator RS 232C V 24 Pin 22 signal as the rings are detected The BA MAC models do not use DTR Note that in order for the called modem to be able to answer the call it must have a high DTR Data Terminal Ready signal This signal comes from the computer or terminal to which it is attached on RS 232C Pin 20 When the called modem answers the call its OH Off Hook circuit comes on and the ringing stops Two seconds after the call is answered the called modem begins transmitting its answerback tone The originating modem which has been off hook and waiting for the answerback tone turns on its transmitter when it hears the tone Then after a one second delay the orignating modem s CD Carrier Detect comes on The called modem then responds to the originat
197. ue to the flexibility of the V 25bis standard each country may establish specific regulations governing the way operations are handled The purpose of this document is to detail each country s specific regulations that affect operation of V 25bis in Multi Tech modems 1 Italy a Command Indication modifications 1 Phone number indications include status ZPSTTT a8 Z U D or F for Unrestricted Delayed or Forbidden b P Delay time if delayed C S Number of retries so far d TTT Interdiction time to further attempts b Delayed and Forbidden list behavior 1 5 retries without delay 2 2 minute delay between next 4 retries 3 After 9 retries the number is put on the forbidden list 4 120 minute timer is started on entry to delay list 5 When it runs out the number is removed from which ever list it is on C Auto Answer mode behavior 1 Auto Answer in 5 seconds if no DIC 2 Get 10 seconds after DIC to enter CIC 3 If 10 seconds times out then no connection is possible 2 Switzerland a Command Indication modification 1 Modem must remain on hook for 5 seconds after disconnect 2 Modem must remain on hook for 5 minutes after 4 consecutive failed calls 3 If modem must remain on hook then it is paused 4 If the modem is paused and a call is attempted a PAU indication is given a PAUt Modem is paused for t minutes b Delayed and Forbidden list behavior 1 2 minute delay between 4 retries 2 After 4 retries the number is put on
198. ues stored in the modem s S Register This information can be very useful if you wish to change S Register values Refer to Chapter 6 for more information on S Registers 73 MultiModemBA User Guide 74 Listing On Line Diagnostics L8 The L8 command displays the current on line CONNECT status of the modem This display can be printed and used as a modem status report or as diagnostic information such as when calling Tech Support To activate this command first type AT lt CR gt on line escape command while maintaining command mode then type ATL8 What then displays on your monitor is your modem s current on line condition e g Link Type Line Speed Serial Speed Type of Error Correction Data Compression Number of past Retrains etc Off Hook H You can make the modem hang up go On Hook Entering ATH7 lt RETURN gt brings the line Off Hook just as if you picked up the telephone set You can hang up by entering ATHO or ATH the default is 0 when no number is entered Escape Sequences Entering Command Mode While Still On Line AT lt CR gt It is possible to cause the modem to enter Command mode after the modem has gone on line with a remote modem without disconnecting the call This is done by entering an Escape Code The default Escape Code used by the modem is three plus signs followed by the letters A and T up to Sixty command characters most typically H to hang up and a RETURN The number of command cha
199. ugh a cut out on the side of the modem This chapter explains the modem s printed circuit board options Sixteen DIP Switch settings and the modem s speaker volume control are explained in detail including all default settings H Power Switch Power Jack LED Indicators RS 232 V 24 Connector Line Jack lt Phone Jack 16 position DIP switch Figure 9 1 PC Board 108 9 2 Chapter 9 DIP Switch Settings DIP Switch Option Settings Switch 1 Forced DTR DTR Asynchronous Synchronous Mode Leased Line Dial Up The modem must have a high DTR signal in order to operate DTR is provided to the modem by the terminal or computer to which it is attached through pin 20 of the RS 232C V 24 interface If your terminal or computer is not providing DTR to the modem you can force the DTR signal high with DIP Switch 1 DTR function normally Switch 1 UP DTR forced On Switch 1 DOWN Factory Default Setting UP Switch 2 Flow Control amp E4 amp E5 Asynchronous Mode Leased Line Dial Up With Hardware Flow Control the modem uses its RS 232C V 24 interface to control the flow of data from the computer or terminal to which it is attached The CTS signal on Pin 5 of the RS 232C V 24 is brought low to stop the flow of data and is brought high to restart it Place DIP Switch 2 in the UP position to enable Hardware Flow Control amp E4 Xon Xoff Flow Control amp E5 is another flow contr
200. ult Storage Commande sse 54 5 4 5 Command Response Result Code Commande AAA 56 5 4 6 Phone Line Conditioning Commande sse nennen enn nsns 58 5 4 7 HS 232G Interface Control erennert e EE 61 54 8 Eitor Comecon Commands EE ne erte ee ie 63 549 Fl wC ntrol Commands essaient M 66 5 4 10 Compression Error Correction Flow Control Pass Through and Pacing Commands 69 54 11 Speed Conversion eu Ee EE 70 5412 Immediate Action Command S sarja tannins Nr ta este 73 5 4 13 Line Probe Commands 2834 Series only 1 iter desire aA 75 Chapter 6 S Registers 6 1 alt Le Le iol e RUNTIME 78 6 2 Reading and Assigning S Register Values AAA 84 62 1 Examples or Assigning KEE 84 622 Ex mplesof Reading Valles ooi naa E a E 84 6 3 AT Command and S Register Summary iii 85 Chapter 7 Callback Security and Remote Configuration 7 1 due Le eu EE 88 7 2 Callback Feature EE cesiones AE net ne e fos datu AAEE 88 7 3 Remote Configuration RTE EE 89 7 3 1 Initial Setup Procedures for Callback and Remote Configuration sess 89 1 3 2 Remote Configuration Procedures iiir tete iene Ree eels 92 7 4 Remote Configuration and Callback Security AT Commands sess 93 70 Remote Configuration Callback Security S Registers AAA 95 Chapter 8 Modem Testing 8 1 INTOUUCHONMEE EL mc 98 8 2 Local Analog Loopback Test V 54 LOOD E E 99 8 3 Digital Loopback Test V 54 Loo
201. unication speeds approach 57 600 bps depending on the file content and the receiving modem s capability and the data sent will be 100 error free 1 3 3 932 Series Features Your MT932BA modem is designed according to the international CCITT V 32 specification for data signalling rates as high as 9600 bps in full duplex mode The MT932BA is AT command set compatible and incorporates a number of capabilities beyond the basics of V 32 operation Other capabilities include CCITT V 25bis synchronous dialing compatibility with CCITT V 42 error correction and V 42bis data compression in which data communication speeds approach 38 400 bps depending on the file content and the receiving modem s capability and the data sent will be 100 error free 1 4 Chapter 1 Introduction and Description Fax Features Your modem meets the ITU V 17 standard for sending and receiving faxes When linked to a compatible fax machine or modem it can transmit faxes at 14 4 K bps It also meets the ITU s Group 3 Designation for sending and receiving faxes at 9600 bps and Group 2 Designation for sending and receiving faxes at 4800 bps The modem is also downward compatible with modems to speeds as low as 300 bps so it can send and receive faxes with any fax machine in the world 11 MultiModemBA User Guide 1 5 12 Technical Specifications Your data fax modem meets the specifications listed below Tradename Model Numbers 2834 Series 1432 Serie
202. ur right to file a complaint with the FCC if you believe it is necessary The telephone company may make changes in its facilities equipment operations or procedures that could affect the operation of the equipment If this happens the telephone company will provide advance notice in order for you to make necessary modifications in order to maintain uninterrupted service If trouble is experienced with this equipment the model of which is indicated below please contact Multi Tech Systems Inc at the address shown below for details of how to have repairs made If the trouble is causing harm to the telephone network the telephone company may request you remove the equipment from the network until the problem is resolved No repairs are to be made by you Repairs are to be made only by Multi Tech Systems or its licensees Unauthorized repairs void registration and warranty This equipment cannot be used on public coin service provided by the telephone company Connection to Party Line Service is subject to state tariffs Contact the state public utility commission public service commission or corporation commission for information If so required this equipment is hearing aid compatible Trade Name MultiModem Model Number MT2834BA MT1432BA MT932BA FCC Registration AU7USA 65363 MD E Ringer Equivalence 0 5B Modular Jack USOC RJ 11C or RJ 11W single line Service Center in USA Multi Tech Systems Inc 2205 Woodale
203. ure You can turn on callback security by typing ATZDB1 or ATZDB2 and pressing CR If you want to engage both remote and local password security use the ZDB1 command This sets up the modem so you have to provide passwords to dial into the modem and to dial out For remote password security only use the DB2 command This allows the local operator to dial out without providing the LOGIN and SETUP passwords Use ZDB3 when calling another modem with callback security active Change LOGIN Password l The default LOGIN password for your modem is MULTI TECH If you choose to activate callback security you should change the LOGIN password using this command in the following format AT IXXXXXXXXXX lt CR gt where XXXXXXXXXXXXXXXX is the current LOGIN password Your modem will respond with OK indicating that you can enter the new LOGIN password as follows AT l yyyyyyyyyy lt CR gt You can select any combination of keyboard characters upper lower case sensitive between six and ten characters long Change SETUP Password S The default SETUP password for your modem is SMODEMSETUP If you choose to activate callback security you should change the SETUP password using this command in the following format AT Stitttttttt lt CR gt where tttttttttt is the current SETUP password Your modem will respond with OK indicating that you can enter the new SETUP password as follows AT s uuuuuuuuuu lt CR gt You can select any combina
204. using modulated calling and answering tones indicating the common capabilities of the modem at each end Once this is done a probing signal is passed between the modems to identify impairments in the telephone channel e g Receive Signal Strength vs Frequency Noise vs Frequency and Signal to Noise Ratio vs Frequency After receiving the results of the probing signal the modem receivers and transmitters begin with the lowest speed and move up until reaching the highest speed at which they can exchange data All this occurs in about five seconds There are a number of Line Probe Commands These commands are configurable and can be stored to RAM via AT amp WO These commands are listed below Enable Disable Reading of Line Probe Information Commands DPO Do not read Line Probe information from DSP during handshake Default DP1 Read Line Probe information from DSP during handshake Format of Line Probe Graph or Table Commands DFO Data is displayed in Graph format Y axis is shown in dBms Default DF1 Data is displayed in Table format Numeric values are displayed for 150Hz to 3750Hz in 75HZ increments Immediate Action Line Probe Commands To activate these commands first type AT lt CR gt on line escape command while maintaining command mode then type the Command prefixed by an AT amp RP This command initiates a retrain that makes the processor read Line Probe information Valid only when on line in V
205. utomatic or manual dialing automatic or manual answer Fully AT command compatible microprocessor controlled remote configuration EIA extended Automode adaptive line probing automatic symbol rate and carrier frequency during start up retrain and rate renegotiation autodial redial repeat dial dial linking pulse or tone dial dial tone detection dial pauses call status display auto parity and data rate selection keyboard controlled modem options nonvolatile memory and on screen displays for modem option parameters and up to ten telephone numbers command lines of up to 60 digits each help menus 60 characters Trellis Coded Modulation TCM at 33 600 31 200 28 800 26 400 24 000 21 600 19 200 16 800 14 400 12 000 and 9600 bps Quadrature Amplitude Modulation QAM at 9600 non trellis 4800 and 2400 bps PSK at 1200 bps FSK at 300 bps Trellis Coded Modulation TCM at 14 400 12 000 and 9600 bps Quadrature Amplitude Modulation QAM at 9600 non trellis 4800 and 2400 bps PSK at 1200 bps FSK at 300 bps Trellis Coded Modulation TCM at 9600 bps Quadrature Amplitude Modulation QAM at 9600 non trellis 4800 and 2400 bps PSK at 1200 bps FSK at 300 bps V 21CH2 FSK at 300 bps V 27ter DPSK at 4800 and 2400 bps V 29 QAM at 9600 and 7200 bps V 17 TOM at 14400 12000 9600 and 7200 bps V 21CH2 FSK at 300 bps V 27ter DPSK at 4800 and 2400 bps V 29 QAM at 9600 and 7200 bps 13 MultiModemBA User Guide
206. ve been designed to meet the electrical specifications given in EIA Electronic Industries Association RS 232C standards All signals generated by the modem are approximately 10 volts when measured across a load of 3000 ohms or greater The receiving circuits of the modem will accept signals in the 3 to 25 volt range The voltage thresholds are Negative voltage more negative than 3 volts with respect to signal ground Positive voltage more positive than 3 volts with respect to signal ground SIGNAL INFORMATION NEGATIVE POSITIVE Binary State One Zero Signal Condition Mark Space Control and Timing Function Off On The input impedances of all modem circuits which accept signals from the data processing terminal or CPU equipment have DC resistances of 4 7K For more specific details consult the EIA RS 232C standard itself The following chart lists the EIA RS 232C interface pins and circuits present on the modem s RS232C Interface connector All other pins are unused Pin Designation eia CCITT signal Function Assignment circuit circuit source 1 PG 101 Protective Ground 2 SD BA 103 DTE Transmitted Data 3 RD BB 104 DCE Received Data 4 RTS CA 105 DTE Request to Send 5 CTS CB 106 DCE Clear to Send 6 DSR CC 107 DCE Data Set Ready 7 SG AB 102 Signal Ground 8 CD CF 109 DCE Carrier Detect 9 V V DCE Test Voltage 12 HS DCE High Speed 15 TC DB 114 DCE Transmit Clock 17 RC DD 115 DCE Receive Clock 20 T
207. ve to initiate the transfer yourself In most datacomm programs the PAGE DOWN key initiates the download When the download is complete press ENTER to return to the File Menu To exit the BBS type G and press ENTER If you don t know the file name 1 From the Main Menu type F to access the Files Menu For a list of file areas type L press ENTER then type L and press ENTER again If you do not type the second L you will list all of the files on the BBS Mark each file area you would like to examine by typing its list number and pressing ENTER Enter L to list all the files in the selected file areas Enter C to go forward in the file list and P to go back To mark one or more files for download type M press ENTER type the list numbers of the files and press ENTER again Enter D You will see a list of the files you have marked Enter E if you would like to edit the list otherwise enter D again to start the download process Select a file transfer protocol by typing the indicated letter such as Z for Zmodem the recommended protocol If you select Zmodem the file will transfer automatically If you select another protocol you may have to initiate the transfer yourself In most data communications programs the PAGE DOWN key initiates the download When the download is complete press ENTER to return to the File Menu To exit the BBS type G and press ENTER 10 6 10 7 Chapter 10 Warranty Service and T
208. ware or your datacomm software but not both at the same time unless you have a special communications device management application such as Multi Tech s Virtual Modem Driver In Windows 95 you can have data and fax communication applications open at the same time but they cannot use the same modem at the same time Appendix B ASCII Conversion Chart Appendix B ASCII Character Code Hex Decimal Conversion Chart CTRL CODE HEX DEC CODE HEX DEC CODEHEX DEC CODE HEX DEC NUL 00 0 SP 20 32 40 64 60 96 A SOH 01 1 21 33 A 41 65 a 61 97 B STX 02 2 22 34 B 42 66 b 62 98 C ETX 03 3 23 35 C 43 67 C 63 99 D EOT 04 4 24 36 D 44 68 d 64 100 E ENQ 05 5 96 25 37 E 45 69 e 65 101 F ACK 06 6 amp 26 38 F 46 70 f 66 102 G BEL 07 7 27 39 G 47 71 g 67 103 H BS 08 8 28 40 H 48 72 h 68 104 HT 09 9 29 41 49 73 i 69 105 J LF OA 10 2A 42 J 4A 74 j 6A 106 K VT OB 11 2B 43 K AB 75 k 6B 107 L FF OC 12 2C 44 L 4C 76 6C 108 M CR OD 13 2D 45 M 4D 77 m 6D 109 N SO OE 14 2E 46 N 4E 78 n 6E 110 O SI OF 15 2F 47 O 4F 79 o 6F 111 P DLE 10 16 0 30 48 P 50 80 p 70 112 Q DCI 11 17 1 31 49 Q 51 81 q 71 113 R DC2 12 18 2 32 50 R 52 82 r 72 114 S DC3 13 19 3 33 51 S 53 83 S 73 115 T DC4 14 20 4 34 52 T 54 84 t 74 116 U NAK 15 21 5 35 53 U 55 85 u 75 117 V SYN 16 22 6 36 54 V 56 86 V 76 118 W ETB 17 23 7 37 55 W 57 87 w 77 119 X CAN 18 24 8 38 56 X 58 88 D 78 120 Y EM 19 25 9 39 57 Y 59 89 y 79 121 Z SUB 1A 26 3A 58 Z 5A 90 H 7A 122 ESC
209. wer to the modem When an ATZ command is executed the state of the amp W command determines where the default values originate amp WO defaults come from RAM and amp Wf1 defaults come from ROM Chapter 5 Command Mode Unix UUCP Spoofing SP The modem can be configured in a Unix environment that employs ACK flow control as a means of monitoring data integrity The modem can do UUCP spoofing where the modem is able to generate ACKs at the DTE interface Data is transmitted more time efficiently because the delay of waiting for data to be received then for an ACK to be returned at the remote end is eliminated The SP1 command enables UUCP spoofing and the default command SP0 disables UUCP spoofing Async Sync Mode Switching amp M This command can be used to set the on line mode to either synchronous or asynchronous AT amp MO will set the modem to Asynchronous mode and all communications will be Asynchronous in both On line and Command modes AT amp M1 causes the modem to communicate asynchronously when in Command mode and switch to synchronous mode while on line The modem defaults to amp MO asynchronous communications on reset or power up Synchronous Transmit Clock Select amp X The amp X command selects the Synchronous Transmit Clock Source in conjunction with DIP Switch 11 DIP Switch 11 in the UP position enables External clocking DIP Switch 11 in the DOWN position enables Internal clocking default position Exter
210. words Chapter 5 Command Mode Result Codes Basic and Extended and Call Progress Selection X The X Command is used to select one of two possible dialing methods dumb or smart and to select various response combinations related to these methods You can choose to have certain responses suppressed or whether or not you want speed indications along with the CONNECT responses You can also pick and choose certain responses in order to match up with Standard AT responses Refer to Appendix G for a summary of Result Codes The modem provides Basic and Extended Result Code sets The difference between the two is the Basic set provides one response CONNECT to indicate a connection while the Extended set provides several responses for different speeds CONNECT CONNECT 2400 CONNECT 4800 CONNECT 9600 Etc When the Extended set is chosen you also have the option of matching them up with Standard AT 2400 response code sets by including or not including the BUSY and or NO DIAL TONE responses while excluding the DIAL TONE response The X command is used to select which responses are provided Regarding the modem s method of dialing the modem can detect standard dial tones and busy signals This capability smart dialing allows the modem to wait for a dial tone and when one is detected to begin dialing immediately The modem also can detect a distant busy signal if after dialing it reaches a busy number This is u
211. you again reach a busy signal it re dials again and again until it no longer detects a busy signal You can stop the modem from re dialing by pressing any key Another method used to cause the modem to redial a phone number continuously is to enter a colon at the end of the phone number The result is the same as if you had entered A after personally observing that the number was busy on the first dialing attempt Using the colon in the dialing string is a step saver Dialing a Stored Number N A telephone number that you have stored in the modem s number memory may be automatically dialed by entering ATNn where n 0 1 2 3 4 5 6 7 8 or 9 For example a number stored at N3 would be dialed by entering ATN3 and RETURN Do not include the letter D in this command or the stored number will be erased also see Section 5 4 3 on Phone Number Memory Commands DTR Dialing D An alternate method of causing the modem to automatically dial is DTR Dialing Data Terminal Ready DTR is a signal that comes into the modem from the terminal or computer to which it is connected on pin 20 of the RS 232C interface In DTR dialing the modem automatically dials a stored number as soon as it receives a high DTR Signal The DTR dialing method is popular in synchronous applications 49 MultiModemBA User Guide 50 To activate DTR Dialing enter AT D1 and hit RETURN The modem dials the phone number stored in the NO location of memory when it rec
212. you have access to the features used for configuring the modem Because the defaults are in the modem owner s manual and anyone can find out what they are you should change the codes as the first step of your initialization procedure Table 7 1 Modem LOGIN Setup and Remote Escape Code Procedures To change your modem s LOGIN Password and Setup Password Step Procedure Note Passwords are upper lower case sensitive The case you enter here is the case that must be used at Log In 1 Type ATZIMULTI TECH and hit RETURN Your modem will respond with OK if the LOGIN Password is wrong the modem s response is ERROR 2 Type ATZSMODEMSETUP and hit RETURN Your modem will respond with the following OK or ERROR if wrong Setup Password Note At this point you can change the LOGIN Password and Setup Password 3 Type AT I xXxxxxxxxxx with any keyboard characters used minimum 6 maximum 10 and hit RETURN Your modem responds with OK 4 Type ATZSzyyyyyyyyyy with keyboard characters used minimum 6 maximum 10 and hit RETURN Your modem responds with OK To change your Remote Configuration feature status 5 f you want Remote Configuration off set S Register S13 to 0 zero Refer to Chapter 6 for details on how to set S Register values 6 If you want Remote Configuration on and wish to change the Remote Escape Character change the S Register S13 value If you leave it at the default value decimal 37 96 sign will be your modem s re
213. you know that the other modem is a V 42 error correcting modem and you wish to use LAP M the L3 command disables the detection phase and goes directly to protocol establishment Both modems must have ZL3 in effect Auto Reliable Buffering A In Auto Reliable mode the modem is given four seconds to establish a Reliable connection After this four second period the modem drops to Normal mode Any data which is received during this period is typically discarded The A command can be used to cause the modem to buffer save data that is received during this Auto Reliable time out period This data will then be output by the modem after the CONNECT message AT A0 Discard data received during auto reliable time period AT A1 Buffer data received during auto reliable time period The factory default is A0 Chapter 5 Command Mode Enable Disable Auto Reliable Fallback Character F In Auto Reliable mode the modem is given four seconds to establish a Reliable connection If a single CARRIAGE RETURN is received from the remote modem during this four second period the Auto Reliable modem assumes that the remote modem is not in Reliable mode and drops to Normal non error correcting mode The CARRIAGE RETURN is the only character which causes the modem to drop to Normal mode Any other character will either be buffered or discarded The F command can be used to disable this fallback to Normal due to CARRIAGE RETURN feature The Auto

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