FAX/DATA MODEM USER`S MANUAL
Contents
1. S37 15 37 16 37 17 37 18 37 19 Default 24000 bits s 26400 bits s 28800 bits s 31200 bits s 33600 bits s 0 38 56K Downstream Rate Selection for K56 flex V 90 Mode default 1 There are at S109 1 K56 flex V 90 common operation or S109 2 V 90 only K56 flex disable S38 0 S38 1 S38 2 S38 3 S38 4 S38 5 S38 6 S38 7 S38 8 S38 9 S38 10 S38 11 S38 12 38 13 S38 14 S38 15 S38 16 S38 17 S38 18 S38 19 S38 20 S38 21 S38 22 Default V 90 or K56 flex disable V 90 or K56 flex autorate 29333bit s 30666bit s 32000bit s 33333bit s 34666bit s 36000bit s 37333bit s 38666bit s 40000bit s 41333bit s 42666bit s 44000bit s 45333bit s 46666bit s 48000bit s 49333bit s 50666bit s 52000bit s 53333bit s 54666bit s 56000bit s 4 S40 ETC Startup Autorating S40 0 S40 1 S40 2 Range Default S42 Auto Rate Startup with normal autorating Startup at initial rate of 4800 or below Startup at initial rate of 9600 or below 0 2 0 This command is used for testing and debugging only V 32bis and V 22bis auto rate is disabled Retrain operation is disabled or enabled in data mode and fallback is disabled in data mode O auto rate disabled 1 enabled Range 0 1 Default 1 S43 Auto Mode This command is used for testing and debugging only V 32bis startup auto mode operation disabled O auto mode disabled 1 enabled Range 0 1 Default 1 S48 LAPM Error Control and Feature Negoti2. Mn Nn Xn Yn Zn amp Bn Go On line in Answer Mode Communication Standard Setting Carrier Control Option dummy command Dial AT Command Echo Options On Line Echo Command dummy command Switchhook Control Request ID Information Speaker Volume Speaker Control Select Negotiate Handshake Return On Line to Data Mode Enable Pulse Dialing Results Code Display Option Enable Tone Dialing Result Code Form Select Extended Result Codes Result Code Selection and Call Progress Monitoring Long Space Disconnect Recall Stored Profile V 32 Auto Retrain amp Cn amp Dn amp Fn amp Gn amp Jn amp Kn amp Mn amp Pn amp Qn amp Sn amp Tn amp Vn amp Wn amp Yn amp Zn Gn Jn Kn Nn Qn Tn Vn Xn B Cn ES 6 Data Carrier Detect Option Async only Data Terminal Ready Option Load Factory Settings Guard Tone Option Auxiliary Relay Option Select Flow Control Asynchronous Communications Mode Pulse Dial Make to Break Ratio Selection Asynchronous Communications Mode Data Set Ready Option Self Test Commands View Active Configuration and Stored Profile Store Current Configuration Select Stored Profile for Hard Reset Store Telephone Number Modem Port Flow Control Adjust Bits s Rate Control Set Break Control Error Control Mode Selection Local Flow Control Selection Inactivity Timer Protocol Result Code XON XOFF Pass Through View Numbers in Blacklist Data Compressi
3. accept the escape command which will bring the modem into the on line command state On Line Command State A modem state in which the modem can accept or and execute commands from an asynchronous computer or terminal while remaining connected with the remote modem The user can return the modem to the on line state by issuing the ATOn command or put it into the off line command state by issuing commands such as ATZ or ATH Parity An error checking method by which the modem verifies that the data just sent is correct pps Pulse per second Profile A list of default settings Protocol A technical specification for serial communications the protocols supported by the modem are listed in Appendix B PSK Phase Shift Keying Pulse Dialing A dialing form in which each digit is represented by a series of pulses Rotary telephones all use pulse dialing QAM Quadrature Amplitude Modulation Result Codes The response the modem returns to the screen upon executing a command RAM Random Access Memory ROM Read Only Memory A chip inside the modem which stores the factory default settings This memory cannot be changed RTS Request To Send RX Reception S Register RAM locations in the modem which store the active configuration Serial Port See COMx TCM Trellis Coded Modulation Touchtone Dialing A dialing format in which each digit is represented by a musical frequency TX Transmission E ASCII CODE TABL
4. call Bn Communication Standard Setting This command determines ITU T vs Bell standard BO Selects ITU T V 22 mode when the modem is at 1200 bits s B1 Selects Bell 212A when the modem is at 1200 bits s default B2 Unselects V 23 reverse channel same as B3 B3 Unselects V 23 reverse channel same as B2 B15 Selects V 21 when the modem is at 300 bits s B16 Selects Bell 103J when the modem is at 300 bits s default Cn Carrier Control Option dummy command This command is used by some modems to control the transmit carrier This modem does not support CO and will respond in error if this command is given This modem will accept C1 without error in order to ensure backward compatibility with communications software that issues this command co Transmit carrier always off returns ERROR C1 Normal transmit carrier switching default Dn Dial This command instructs the modem to begin the dialing sequence The dial string n including modifiers and the telephone number is entered after ATD command A dial string can be up to 40 characters long Any digit or symbol 0 9 A B C D may be dialed as touchtone digits Characters such as spaces hyphens and parentheses do not count they are ignored by the modem and may be included in the dial string to enhance readability The following may be used as dial string modifiers L Redials last number Should be the first character following ATD ignored otherwise P P
5. 0 bits s Carrier detected at 31200 bits s Carrier detected at 33600 bits s MNP compression negotiated V 42bis compression negotiatied No compression negotiatied NONE 70 PROTOCOL NONE Asynchrous mode 77 PROTOCOL V 42 LAPM LAPM 80 PROTOCOL MNP MNP negotiatied 81 PROTOCOL MNP Class 2 negotiated MNP 2 82 PROTOCOL MNP Class 3 negotiated MNP 3 83 PROTOCOL MNP Class 2 and 4 negotiated MNP 2 4 84 PROTOCOL MNP Class 3 and 4 negotiated MNP 3 4 85 CARRIER 29333 Carrier detected at 29333 bits s V 90 86 CARRIER 30666 Carrier detected at 30666 bits s V 90 87 CARRIER 32000 Carrier detected at 32000 bits s K56 flex or V 90 88 CARRIER 33333 Carrier detected at 33333 bits s V 90 89 CARRIER 34000 Carrier detected at 34000 bits s K56 flex 90 CARRIER 34666 Carrier detected at 34666 bits s V 90 91 CARRIER 36000 Carrier detected at 36000 bits s K56 flex or V 90 92 CARRIER 37333 Carrier detected at 37333 bits s V 90 93 CARRIER 38000 Carrier detected at 38000 bits s K56 flex 94 CARRIER 38666 Carrier detected at 38666 bits s V 90 95 CARRIER 40000 Carrier detected at 40000 bits s K56 flex or V 90 96 CARRIER 41333 Carrier detected at 41333 bits s V 90 97 CARRIER 42666 Carrier detected at 42666 bits s V 90 98 CARRIER 44000 Carrier detected at 44000 bits s K56 flex or V 90 99 CARRIER 45333 Carrier detected at 45333 bits s V 90 100 CARRIER 46000 Carrier detected at 46000 bits s K56 flex 101 CARRIER 46666 Carrie
6. 1 General Command Information Except for the A command and the escape command described in Section 2 3 all commands must be prefixed with the attention code AT For instance the A command below would be entered as AT A lt CR gt Without the AT prefix the command line cannot be executed Once entered AT cannot be deleted with the Backspace or Delete keys More than one command can be placed on a single line and if desired separated with spaces for readability Once the carriage return Enter key is pressed the command line is executed A line with no carriage return is ignored The modem accepts either upper or lower case characters in the command line and ignores any spaces within or between commands Typing errors can be corrected with the Backspace key Exceptions are noted in the description of specific commands Variables r and x are listed in italics Punctuation symbols E use as dial modifiers are listed alphabetically according to their English names at the Dn command Where two commands are separated by a slash either command will have the same effect For example if the command is listed as BO B issuing either BO or B will have the same effect 2 2 AT Commands A Go On line in Answer Mode This command instructs the modem to go off hook immediately and then make a handshake with the remote modem Handshaking is not available during leased line operation A is usually used to manually answer an incoming
7. 1 K56 flex or V 90 109 2 V 90 only Default 1 4 TROUBLESHOOTING GUIDE This chapter describes common problems in the installation configuration and regular usage of your Fax Data Modem To test the Fax Data Modem a communication software package is needed and the package must include a mode that allows you to operate your Fax Data Modem by directly issuing internal commands to the modem Follow the procedures in the following sections to resolve these common problems No Response From Your Modem 1 If you are using the internal add on card modems make sure that the COM port address you have set your modem to corresponds to the appropriate selection in the communications software which you are using 2 Issue the ATZ command to reset your modem The returned result code should be 0 or OK depending on what communications program you are using Your modem is OK if you get one of these responses If there is no response after issuing the ATZ lt CR gt continue to the next step 3 Check if there are any other interface cards in your computer that use the same COM port address as your modem If so you must set your modem to another COM port address Keep in mind that on most systems only two COM ports are available One of them must be used as either 1 or 3 while the other must be used as 2 or 4 For example if a mouse is set to COM1 your modem should be set to COM2 or COM4 Continue to the next step if the COM port ad
8. 9394 to the 3rd location in NVRAM Afterwards you can use the second command line to dial this stored number The dial string T03 709394 will appear on the screen to indicate the number being dialed 5 3 Manual Answer an Incoming Call Command line ATA lt CR gt The factory setting of the S register SO is SO 0 This condition disables the auto answer capability so that you must issue an ATA command to answer a call At power up your modem always monitors if there are incoming rings If incoming rings are detected your modem will display result codes on the screen as RING RING Seeing that you may issue the ATA command to answer the call This command must be entered within the quiet interval between any two rings 5 4 Auto Answer an Incoming Call Command line AT S0 2 amp W SK Y lt CR gt Auto answer can be enabled by changing the setting of the S register SO to a value between 1 and 255 In the above command line SO 2 instructs the modem to answer an incoming call automatically after the 2nd ring The amp W command writes this configuration to profile 0 in NVRAM 8 Y command instruct the modem to load profile O as the active configuration on power up The last two commands make S0 2 the default value at power up or reset This example also shows the insertion of space between two neighboring commands to make the command line more readable 5 5 Voice to Data Switching Command line ATA lt CR gt or ATX1D lt CR gt If you
9. E Decimal Hex Value Decimal Hex Value Decimal Hex Value Decimal Hex Value 000 00 NUL 032 20 space 064 40 096 60 001 01 SOH 033 21 065 41 A 097 61 a 002 02 STX 034 22 066 42 B 098 62 b 003 03 ETX 035 23 067 43 C 099 63 c 004 04 EOT 036 24 068 44 D 100 64 d 005 05 ENQ 037 25 069 45 E 101 65 e 006 06 ACK 038 26 8 070 46 F 102 66 f 007 07 BEL 039 27 2 071 47 G 103 67 g 008 08 BS 040 28 072 48 H 104 68 h 009 09 HT 041 29 073 49 105 69 i 010 OA LF 042 2A 074 4A J 106 6A j 011 0B VT 043 2B 075 4B K 107 6B k 012 OC FF 044 2c 076 4C L 108 6C 013 0D CR 045 2D 077 4D M 109 6D m 014 0E SO 046 2E lt 078 4E N 110 6E n 015 OF SI 047 2F 079 4 O 111 6F o 016 10 DLE 048 30 0 080 50 P 112 70 p 017 11 DC1 049 31 1 081 51 Q 113 71 q 018 12 DC2 050 32 2 082 52 R 114 72 r 019 13 DC3 051 33 3 083 53 S 115 73 s 020 021 022 023 024 025 026 027 028 029 030 031 052 053 054 055 056 057 058 059 060 061 062 063 OANOOF NV IAS st 084 085 086 087 088 089 090 091 092 093 094 095 gt TN lt XS lt CH 116 117 118 119 120 121 122 123 124 125 126 127 Pwr ONE x Scoot DEL
10. FAX DATA MODEM USER S MANUAL Table of Contens i FCC DOC REQUIREMENTS i 1 FCC General Information i 2 FCC Notice i 3 DOC Notice 1 INTRODUCTION 2 COMMAND REFERENCE 2 1 General Command Information 2 2 AT Commands 2 2 a Commands Preceded by amp 2 2 6 Commands Preceded by 2 2 c Commands Preceded by 2 2 d Commands Preceded by 2 2 e AT Commands Reference 2 2 f AT Commands for Testing and Debugging 2 3 Commands Not Preceded By AT 2 4 Result Codes 3 S REGISTER REFERENCE 3 1 Register Summary 3 2 Glossary of the S Registers 4 TROUBLESHOOTING GUIDE 5 APPLICATION EXAMPLES 5 1 Dialing a Remote Modem 5 2 Dial a Stored Number 5 3 Manual Answer an Incoming Call 5 4 Auto Answer an Incoming Call 5 5 Voice to Data Switching A TECHNICAL SPECIFICATIONS B QUICK REFERENCE C HINTS FOR FAX SOFTWARE INSTALLATION D GLOSSARY E ASCII CODE TABLE i FCC DOC REQUIREMENTS i 1 FCC General Information The Federal Communications Commission FCC of the United States restricts specific uses of modems and places registration responsibilities on both the manufacturer and the individual user 1 The modem may not be connected to a party line or to a coin operated telephone 2 The modem manufacturer must make any repairs to the modem to maintain valid FCC registration 3 Notification to the telephone company is no longer required prior to connecting registered equipment but upon request from the telephone c
11. O Connection at 16800 bits s Connection at 57600 bits s Enabled by WO Connection at 7200 bits s Connection at 12000 bits s CONNECT 1200 75 Connection at 1200 bits s 75 bits s V 23 CONNECT 75 1200 Connection at 75 bits s 1200 bits s V 23 CONNECT 38400 CONNECT 21600 CONNECT 24000 CONNECT 26400 CONNECT 28800 CONNECT 115200 CONNECT 31200 CONNECT 33600 CARRIER 300 CARRIER 75 1200 CARRIER 1200 75 CARRIER 1200 CARRIER 2400 CARRIER 4800 CARRIER 7200 CARRIER 9600 CARRIER 12000 CARRIER 14400 CARRIER 16800 CARRIER 19200 CARRIER 21600 CARRIER 24000 CARRIER 26400 CARRIER 2880 CARRIER 31200 CARRIER 33600 COMPRESSION MNP 5 COMPRESSION V 42BIS COMPRESSION Connection at 38400 bits s Connection at 21600 bits s Connection at 24000 bits s Connection at 26400 bits s Connection at 28800 bits s Connection at 115200 bits s Connection at 31200 bits s Connection at 33600 bits s Carrier detected at 300 bits s Carrier detected at 75 bits s 1200 bits s Carrier detected at 1200 bits s 75 bits s Carrier detected at 1200 bits s Carrier detected at 2400 bits s Carrier detected at 4800 bits s Carrier detected at 7200 bits s Carrier detected at 9600 bits s Carrier detected at 12000 bits s Carrier detected at 14400 bits s Carrier detected at 16800 bits s Carrier detected at 19200 bits s Carrier detected at 21600 bits s Carrier detected at 24000 bits s Carrier detected at 26400 bits s Carrier detected at 2880
12. answering handshake only at the communication rate specified by S register 37 and Bn and no fallback N1 When originating or answering start handshake only at the communication standard specified by S register 37 and Bn During handshake fallback to a lower speed may occur except in N1 mode default On Return On line to Data Mode 00 Instructs the modem to exit on line command mode and retuen to data mode see AT Escape Sequence 01 This command issues a retrain before returning to on line data mode 03 This command issues a rate renegotiation before returning to on line data mode P Enable Pulse Dialing This command instructs the modem to use pulse dialing Dialed digits will be pulsed dialed until a T command or dial modifier is received Tone dial is the default setting Qn Results Code Display Option This command controls whether the result codes are displayed to the DTE Qo Result codes enabled default Q1 Result codes disabled T Enable Tone Dialing This command instructs the modem to send DTMF tones while dialing Dialed digits will be tone dialed until a P command or dial modifier is received This is the default setting Vn Result Code Form This command determines whether result codes including call progress and negotiation progress messages are displayed as numbers or words vo Numeric form 0 for OK vi Verbose form 0 for OK default Wn Select Extended Result Codes This command determines wh
13. anual and you are ready to begin operation If you are new to modem communications we recommend that you read through this manual first If you come across terms that you don t understand consult the glossary Words in boldface type are command names commands or default settings Carriage returns Enter are noted with lt CR gt or ENTER this does not mean to enter these characters literally but instead to press the Enter key If you are going to call a FAX machine then you must use the Fax software If the machine that you are going to communicate with is a modem then you must use a data modem communications software This manual is written to be used for several models of Fax Data Modems Some of the information in this manual may not apply to your fax data modem 2 COMMAND REFERENCE This chapter provides an alphabetized reference with examples for all commands for the modem The system of commands is depicted below in Figure 2 1 To use these commands for dialing or configuring the modem make sure the communications software package you will be using lets you operate the modem through its internal commands If your software permits use of the modem s internal commands read this chapter If not read your software user s manual and ignore the rest of this manual Commands Commands not Commands Preceded by AT Preceded by AT A Escape Standard AT Extended AT Command Command Commands Commands Fig 2 1 System of Commands 2
14. are talking with a remote modem user through the telephone set and want to initiate data communication with the remote modem follow the procedure below 1 You or the remote user issue an ATA command first to switch to data communication 2 When the person on the other end hears an answer tone from the phone issues an ATX1D command X1 to disasble the dial tone monitor to instruct the modem to go off hook and wait for a carrier If connection is successful the CONNECT XXXX result code will be displayed on the screen Now you can hang up your phone and begin data communication with the remote modem A TECHNICAL SPECIFICATIONS Speeds bps 300 600 1200 2400 4800 7200 9600 12000 14400 19200 21600 24000 26400 28800 plus 38400 57600 115 2K bps in data mode noly Protocols Data 56K Flex V 90 ITU T V 34 V 32 bis V 32 V 22 bis V 23 V 22 and V 21 Bell 212A and 103 AT amp T V 32 terbo Fax ITU T V 17 V 29 V 27 ter and V 21 ch2 Error Checking 100 reliable data transfer with V 42bis MNP 5 Standards Enhanced AT command set Fax Class 1commands Operation Test Modes Modulation Data Fax Audio Monitor Full or Half duplex 33600 31200 28800 bps with 264000 24000 21600 19200 14400 9600 4800 2400 and 1200 bps auto fall back Analog loopback local digital loopback and remote digital loopback 56000 bps V PCM 33600 bps TCM 31200 bps TCM 28800 bps TCM 26400 bps TCM 24000 bps TCM 21600 b
15. ation S48 7 Negotiation enabled 48 128 Negotiation disabled forces immediate fallback options specified in S36 The following chart lists the S36 and S48 configuration settings necessary to negotiate certain types of connections S48 7 S48 128 S36 0 2 LAPM or hangup do not use S36 1 3 LAPM or async async 36 4 6 LAPM MNP or hangup MNP or hangup 36 5 7 LAPM MNP or async MNP or async 89 Timer to Control Sleep Mode This command displays the number of seconds of inactivity no characters sent from the DTE no RING in the off line command state before the modem places itself into standby mode A value of zero prevents standby mode Note If a number between and 4 is entered for this register it will set the value to 5 and the inactivity before standby will be 5 seconds This is done for compatibility with previous products which allowed time outs down to 1 s Range 0 5 255 Default 10 90 Local Phone Status This register tells the status of the Local Phone It is read only O local phone on hook 1 local phone off hook 91 Line Transmit Level This register is effective only for Japan It specifies the line transmit level in dB with an implied minus sign Range 6 15 dB Default 15 S92 Direct Connect Transmit Level Sets the transmit level in dBm for direct connect This value may have different settings for different phones Default 20 S109 K56 flex V 90 Automode Selection S109 0 V PCM disable S109
16. ause 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 The Load Number LN assigned to each terminal device denotes the percentage or the total load to be connected to a telephone loop which is used by the device to prevent overloading The termination on a loop may consist of any combination of devices subject only to the requirement that the total of the Load Numbers of all the devices does not exceed 100 Locate an analog telephone line Many offices have digital telephone lines which will not work with a modem Warning Do not connect your modem to a digital telephone line Modems are designed for use only with analog telephone lines connecting to a digital telephone line may damage the modem Verify that the line is analog before connecting Fax machines use analog telephone lines If you can t find an analog voice line find a fax machine and use its line 1 INTRODUCTION Congratulations on your purchase of this outstanding Fax Data Modem This manual describes how to operate your new Fax Data Modem Instru
17. cified wait time it proceeds to dial Range 1 255 seconds Default 50 S8 Pause Time for Comma wow S8 controls how long the modem pauses when a comma is encountered in a dial string while executing a dial command Range 0 65 seconds Default 2 S10 Delay between Loss of Carrier and Hang Up S10 determines the delay time between the loss of a carrier from the remote modem and hang up This allows for a temporary loss of carrier without causing the local modem to disconnect When S10 is set to 255 the modem functions as if a carrier is always present The actual interval the modem waits before disconnecting is the value in S10 Range 1 254 tenths of a second Default 20 2 seconds S11 DTMF Touch tone Tone Duration S11 determines the duration and spacing of tones for Dual Tone Multifrequency DTMF dialing This value has no effect on pulse dialing Range 50 150 milliseconds Default 95 12 Escape Guard Time S12 determines the escape guard time The escape guard time is the minimum waiting time required before and after entering the escape code three consecutive escape characters in the on line state It is also the maximum waiting time allowed between any two consecutive escape characters If the waiting time before or after the escape code is shorter than the guard time or if the waiting time between consecutive escape characters is longer than the guard time then the modem does not recognize the escape command and sta
18. ctions for installing your Fax Data Modem will be found in the Installation Manual while the information in this manual deals exclusively with the operation of the modem after it is installed such as the command set the internal configuration registers troubleshooting and testing Features These Fax Data Modems combine the features of a 56000 33600 31200 28800 bps data modem and a 14400 9600 bps FAX modem Your new Fax Data Modem gives your personal computer the ability to send and receive FAX messages over the telephone line like a standard FAX machine Your Fax Data Modem also allows your PC to communicate with other personal computers terminals or BBS s Bulletin Board Systems through the data modem functions When used as a data modem your Fax Data Modem uses the standard AT command set and is fully compatible with K56 Flex V 90 ITU T V 42 V 42bis V 34 ANNEX 12 V 34 V 32bis V 32 V 22bis V 23 V 22 V 21 MNP 2 5 Bell 103 212A and AT amp T V 32terbo When used as a Fax Data Modem it communicates with all ITU T Group 3 FAX machines and is compatible with ITU T V 27ter and V 29 V 17 T 4 and T 30 Switching between DATA mode operation and FAX mode operation of your Fax Data Modem is done through its firmware no hardware settings are required If you are already familiar with the use of a modem and the Hayes AT command set this modem will be extremely easy for you to use Just read the installation procedures in the installation m
19. dem processes XON XOFF flow control characters locally default X1 NOT SUPPORTED responds ERROR 2 2 c Commands Preceded by B View Numbers in Blacklist If blacklisting is in effect this command displays the numbers for which the last call attempted in the past two hours failed The ERROR result code appears in countries that do not require blacklisting Cn Data Compression Control This command determines the operation of V 42bis and MNP class 5 data compression On line changes do not take effect until a disconnect occurs first CO V 42bis MNP 5 disabled No data compression C1 V 42bis MNP 5 enabled Data compression enabled default 2 2 d Commands Preceded by Cn Data Calling Tone Data Calling Tone is a tone of certain frequency and cadence as specified in V 25 which allows remote Data FAX Voice discrimination The frequency is 1300 Hz with a cadence of 0 5 s on and 2 s off C0 Disabled default C1 Enabled 2 2 e AT Commands Reference ES 6 Enable Synchronous Buffered Mode The synchronous buffered data mode allows an H 324 vedio application direct access to the synchronous data channel On underflow the modem sends HDLC flag idle 0x7E to the remote modem This special error control mode is overridden by any of the following commands amp F amp M amp Q and N Result Codes oK ES 6 ES 6 ES or ES shpws the only allowed value ERROR Otherwise 2 2 6 AT Commands for Testing and Debuggin
20. dress is OK 4 Issue the command AT amp F amp W lt CR gt if a 0 or OK result code is displayed on the screen your modem is OK Otherwise contact your dealer for assistance Your Modem Does Not Dial Out Make sure that your modem responds normally If you can communicate through the keyboard check whether the modem is properly connected to the phone line Your Modem Does Not Connect After It Has Dialed a Phone Number The problem may have several causes The phone line may be too noisy or the telephone cord may be poor Try the line with a regular phone Also the remote modem may not recognize your modem s baud rate You Can t Transmit After You Have Connected to the Remote Modem In this case check the communication parameters of the remote modem then configure your software to the same number of data bits stop bit and parity 5 APPLICATIONS EXAMPLE 5 1 Dialing a Remote Modem Command line ATDP9WT002 886 7128423 lt CR gt This command line instruct the modem to dial a remote modem through a PBX The modem first use pulse dialing to dial 9 the access code of the PBX wait for outside dial tone and then use touch tone dialing to dial 002 once a one second continuous dial tone is detected within 30 seconds pause for 2 seconds if S8 2 and then dial 8867128423 5 2 Dial a Stored Number Command line AT amp Z2 T03 709394 lt CR gt Command line ATDS 2 lt CR gt The first command line store the dial string TO3 70
21. e mode Result Codes OK n 0 1 amp Tn Self Test Commands This command allows the user to perform diagnostic tests on the modem These tests can help to isolate problems when experiencing periodic data loss or random errors amp TO Abort Stops any test in progress amp T1 Local analog loop This test verifies modem operation as well as the connection between the modem and computer Any data entered at the local DTE is modulated then demodulated and returned to the local DTE To work properly the modem must be off line amp T3 Local digital loopback test amp T6 Remote digital loopback test This test can verify the integrity of the local modem the communications link and the remote modem Any data entered at the local DTE is sent to and returned from the remote modem To work properly the modems must be on line with error control disabled amp Vn View Active Configuration and Stored Profile This command is used to display the active profiles amp VO View active file amp Wn Store Current Configuration This command stores certain command options and S register values into the modem s nonvolatile memory The ATZ command or a power up reset of the modem restores this profile Result Codes OK n 0 amp Yn Select Stored Profile for Hard Reset This command does not change the behavior of the modem but is included for compatibility with applications that issue the amp YO command 8 YO Select stored profi
22. ed at any time by entering the amp F command 3 1 S Registers Summary The following chart summarizes your modem s registers Default Reg Range Unit Dec Hex Description So 0 255 rings 0 00h Number of Rings Before Auto answer S1 0 255 rings 0 00h Ring Count 2 0 255 ASCII 43 2Bh Escape Character Code 3 0 127 ASCII 13 ODh Command Terminator lt CR gt Character S4 0 127 ASCII 10 OAh Line Feed Character S5 0 255 ASCII 8 08h Back Space Character S6 2 65 seconds 2 02h Wait Time for Dialing S7 1 255 seconds 50 32h Wait for Carrier afterDial S8 0 65 seconds 2 02h Pause Time for Comma Dial Delay S10 1 254 1 10 sec 20 14h Lost Carrier to Hang up Delay S11 50 150 1 1000 sec 95 5Fh DTMF Tone Duration S12 0 255 1 50 sec 50 32h Escape Guard Timing S28 0 255 1 01h V 34 Modulation Enable Disable S30 0 255 minutes 0 00h Inactivity Timer 35 0 1 0 00h Data Calling Tone S36 0 7 7 07h Negotiation Fallback S37 0 19 0 00h Dial Line Rate 38 0 22 1 Oth 56K Downstream Rate Selection for K56 flex V 90 Mode 40 0 2 0 00h ETC Startup Autorating 42 0 1 1 Oth Auto Rate 43 0 1 1 Oth Auto Mode 48 7 128 7 07h LAPM Error Control and Feature Negotiation S89 0 5 255 10 OAh Timer to Control Sleep Mode S90 0 1 0 00h Local Phone Status 91 6 15 1dB 15 OFh Line Transmit Level 92 20 14h Direct Connect Transmit Level 109 0 2 1 Oth K56 flex V 90 Automode Selection Fig 3 1 S Register Summary 3 2 S Registers so Number of Ri
23. error in order to ensure backward compatibility with communications software that issues this command FO Returns ERROR F1 On line echo disabled default Hn Switchhook Control This command provides control over the line relay HO Modem goes on hook H1 Modem goes off hook but will not train default In Request ID Information This command displays specific product information about the modem 10 Returns default speed and controller firmware version same as 13 1 Calculates ROM checksum and dislpays it on the DTE e g 12AB 12 Performs a ROM check and calculates and verifies the checksum displaying OK or ERROR 13 Returns the default speed and the controller firmware version same as 10 14 Returns firmware version for data pump e g 94 15 Returns the board ID software version hardware version and country ID 19 Returns country code e g NA Ver 1 Ln Speaker Volume This command determines the volume level of the speaker when supported by the modem LO Lowest speaker volume L1 Low speaker volume L2 Medium speaker volume default L3 High speaker volume Mn Speaker Control This command determines whether the speaker function of the modem is on or off MO Speaker always off Mi Speaker on until carrier present default M2 Speaker always on M3 Speaker off during dialing and on until carrier Nn Select Negotiate Handshake This command controls automode enable disable NO When originating or
24. g The following commands are to be used for testing and debugging only and are not meant for general use amp amp C Write to Read from Host Interface AT amp amp C lt loc gt lt val gt writes the value lt val gt to host interface at location lt loc gt AT amp amp C lt loc gt reads from location lt loc gt amp amp L Line to Line Loopback This command provides a loopback for line to line amp amp R Write to Read from DSP RAM Location AT amp amp R lt loc gt lt val gt writes the value lt val gt to DSP RAM at location lt loc gt AT amp amp R lt loc gt reads from location lt loc gt amp amp S Speaker Codec Loopback This command has no effect on PCMCIA This command provides a loopback from the microphone to the speaker 2 3 Commands Not Preceded by AT Two commands A and are neither preceded by the attention code AT nor followed by a carriage return Al Repeat Command A repeats the execution of the last command line stored in the command buffer If the last command line is invalid the ERROR result code will appear on the screen Note that A cannot be preceded by AT if it is ERROR will appear on the screen Escape followed by AT lt CR gt returns to the on line command state command state without breaking the established connection from the on line state To escape stop transmitting data wait at least one escape guard time the default time is one second and then en
25. g this device Changes or modifications not expressly approved by the manufacturer could void the user s authority to operate this equipment NOTE The manufacturer is not responsible for any radio or T V interference caused by unauthorized modifications to this equipment Such modifications could void the user s authority to operate the equipment 3 DOC Notice Notice The Canadian Department of Communications label identifies certified equipment This certification means that the equipment meets certain telecommunications network protective operational and safety requirements The Department 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 In some cases the company s inside wiring associated with a single line individual service may be extended by means of a certified connector assembly telephone extension cord 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 Any repairs or alterations made by the user to this equipment or equipment malfunctions may give the telecommunications company c
26. ich result codes will be used to describe the type of connection and protocol that resulted from handshaking and negotiation wo CONNECT result code reports DTE speed default Wi CONNECT result code reports DTE speed enable the CARRIER COMPRESSION and PROTOCOL extended result code W2 CONNECT result code reports DCE speed Xn Result Code Selection and Call Progress Monitoring This command enables tone detection options used in the dialing proces As these functions are chosen the modem chip set s result codes are also affected Therefore this command is frequently used to control the modem chip set s responses The primary function of this control is to control the modem chip set s call response capabilities Ext Result Code Dial Tone Detect Busy Tone Detect X0 Disable Disable Disable X1 Enable Disable Disable X2 Enable Enable Disable X3 Enable Disable Enable X4 Enable Enable Enable default X5 Enable Enable Enable X6 Enable Enable Enable X7 Disable Enable Enable Yn Long Space Disconnect Long space disconnect is always disabled YO Disable long space disconnect default Y1 Enable long space disconnect NOT SUPPORTED Zn Recall Stored Profile This command instructs the modem chip set to go on hook and restore the selected stored profile Any nonstorable parameters previously set are returned to their factory settings ZO Reset and recall user profile 0 Z1 Reset and recall user profile 1 default 2 2 a Commands P
27. le O on power on 8 Y1 ERROR amp Zn x Store telephone Number This command is used to store up to four dialing strings in the modem s nonvolatile memory for later dialing The format for the command is amp Zn stored number where n is the location 0 3 to which the number should be written The dial string may contain up to 40 characters the ATDS n command dials using the string stored in location n Result Codes OK n 0 1 2 3 ERROR Otherwise 2 2b Commands Preceded by Gn Modem Port Flow Control GO Returns an OK for compatibility default G1 NOT SUPPORTED responds ERROR Jn Adjust Bits s Rate Control When this feature is enabled the modem emulates the behavior of modems that force the DTE interface to the line speed JO Turn off feature default J1 Turn on feature Kn Set Break Control This command determines how the modem processes a Break signal received from the local DTE during a connection online Nn KO Reserved returns ERROR K1 Reserved returns ERROR K2 Reserved returns ERROR K3 Reserved returns ERROR K4 Reserved returns ERROR K5 Modem sends the break to the remote modem in sequence with transmitted data non destructive non expedited default Error Control Mode Selection This command determines the type of error control used by the modem when sending or receiving data NO Buffer mode No error control same as amp Q6 N1 Direct mode N2 MNP or disc
28. ngs Before Auto Answer SO determines the number of rings that must be received before the modem automatically answers an incoming call For example when S0 3 the modem automatically answers after the third ring When S0 0 the modem does not automatically answer an incoming call it stays on hook until the A command is issued manually to answer the incoming call Range 0 255 rings Default 0 S1 Ring Count S1 automatically increments its value by one each time the modem receives a ring while in the command state S1 is reset to zero if no ring is detected within 8 seconds Range 0 255 rings Default 0 S2 ASCII Value of Escape Character S2 stores the ASCII value of the escape character Setting register S2 to a value greater than 127 disables the escape command and you cannot return to the command state With escape disabled in the on line state the modem cannot hang up until the power is turned off or the remote modem hangs up Range 0 255 ASCII decimal Default 43 3 ASCII Value of Carriage Return S3 stores the ASCII value of the carriage return character Pertains to asynchronous operation only Range 0 127 ASCII decimal Default 13 S4 ASCII Value of Line Feed Character S4 stores the ASCII value of the line feed character if your computer does not recognize the default as a line feed change the value A value greater than 127 disables the line feed When disabled the line feed character that precedes or follows a
29. ompany the user shall tell the telephone company which line the equipment is connected to as well as the registration number and ringer equivalence number of the registered protective circuitry FCC information is printed on a label on the bottom of the modem i 2 FCC Notice This equipment has been tested and found to comply with the limits for a digital device pursuant to Subpart B of Part 15 of the FCC rules These limits are designed to provide reasonable protection against harmful interference in a residential installation This equipment generates and uses radio frequency energy and if not installed and used the instructions may cause interference to radio communications However there is no guarantee that interference will not occur in a particular installation If this equipment does cause harmful interference to radio or television reception which can be determined by turning the equipment off and on the user is encouraged to try and correct the interference by one or more of the following measures Reorient or relocate the receiving antenna Increase the separation between the equipment and receiver Connect the equipment into an outlet on a curcuit different from that to which the receiver is connected Consult the dealer or an experienced radio TV technician for help Shielded interconnect cables and a shielded power cord must be employed with this equipment to insure compliance with the pertinent RF emission limits governin
30. on Control Data Calling Tone Enable Synchronous Buffered Mode amp amp C Write to Read from Host Interface amp amp L Line to Line Loopback amp amp R Write to Read from DSP RAM Location amp amp S Speaker Codec Loopback Wait for Quiet Answer Pause Initiate a Hookflash Return to Command State after Dialing P Pulse Dial R Reverse Dial Mode S n Dial Stored Number T Tone DTMF Dial WwW Wait for Dial Tone Al Repeat Command Escape C HINTS FOR FAX SOFTWARE INSTALLATION In order to make sure that your modem works properly with your PC in fax mode Please add the modem command 1Q1 to the initial string of the fax software D GLOSSARY ASCII An acronym for American Standard Code for Information Exchange ASCII is a seven bit code which defines 128 standard characters including control characters letters numbers and symbols An extra 128 characters comprise the extended ASCII set Baud Rate The transmission rate between two serial devices e g modems fax machines etc Measured in Bits Per Second Blind Dialing In blind dialing the modem continues to dial regardless of the existence of a dialtone ring or busy signal BPS Bits Per Second the number of bits that can be transmitted in one second Carrier Signal The analog data signal that a modem sends over telephone wires COMx Where x 1 2 3 or 4 COMx is the name address of serial communications ports on personal compute
31. onnect mode The modem attempts to connect using MNP 2 4 error control procedures If this fails the modem disconnects this is also known as MNP reliable mode N3 V 42 MNP or buffer The modem attempts to connect in V 42 error control mode If this fails the modem attempts to connect in MNP mode If this fails the modem connects in buffer mode and continues operation This is also known as V 42 MNP auto reliable mode same as amp Q5 default Qn Tn N4 V 42 or disconnect The modem attempts to connect in V 42 error control mode If this fails the call will be disconnected N5 V 42 MNP or buffer same as 1N3 N7 V 42 MNP or buffer same as N3 Local Flow Control Selection Qo Disable flow control Same as amp KO Q1 XON XOFF software flow control Same as amp K4 Q2 CTS only flow control This is not supported and the response is ERROR Q3 RTS CTS to DTE same as amp K3 default Inactivity Timer This command specifies the length of time in minutes that the modem will wait before disconnecting when no data is sent or received A setting of zero disables the timer Alternatively this timer may be specified in register S30 This function is only applicable to buffer mode Result Codes OK n 0 255 ERROR Otherwise Vn Protocol Result Code vo Disable protocol result code appended to DCE speed V1 Enable protocol result code appended to DCE speed default Xn XON XOFF Pass Through X0 Mo
32. ps TCM 19200 bps TCM 16800 bps TCM 14400 bps TCM 9600 bps TCM 7200 bps TCM 4800 bps QAM 2400 bps QAM 1200 bps DPSK 1200TX 75RX bps FSK 75TX 1200RX bps FSK 600 bps DPSK 300 bps FSK 14400 bps QAM 9600 bps QAM 7200 bps QAM 4800 bps DPSK 2400 bps DPSK Built in speaker with software controllable volume control Guard Tone 550 1800 Hz Compatibility Data K56 Flex V 90 56000 33600 ITU T V 34 ANNEX 12 33600 31200 ITU T V 34 28800 26400 24000 21600 19200 16800 14400 V 32 Terbo 19200 16800 ITU T V 32bis 14400 9600 bps asynchronous synchronous ITU T V 32 9600 4800 bps asynchronous synchronous ITU T V 22bis 2400 1200 bps asynchronous synchronous ITU T V 23 1200 75 bps asynchronous synchronous ITU T V 22 1200 bps asynchronous synchronous ITU T V 21 300 bps asynchronous Bell 212A 1200 bps asynchronous synchronous Bell 103 300 bps asynchronous Fax ITU T V 17 14400 9600 bps half duplex ITU T V 29 9600 7200 bps half duplex ITU T V 27ter 4800 2400 bps half duplex ITU T V 21 channel 2 300 bps half duplex G ill Group 3 fax Compliance FCC 15 8 68 Command Buffer 128 characters Extra Memory 4 x 36 digits Transmit Level 1141dBm Receive Sensitivity 40dBm Pulse Dialing Specifications USA International Make Break Ratio 39 61 33 67 Break Length 61ms 67ms Dial Pulse Length 100m 100ms Dial Pulse Rate 10pps 10pps Interdigit Time 800ms 800ms B QUICk REFERENCE A Bn Cn Dn En Fn Hn In Ln
33. r detected at 46666 bits s V 90 102 CARRIER 48000 Carrier detected at 48000 bits s K56 flex or V 90 103 CARRIER 50000 Carrier detected at 50000 bits s K56 flex 104 CARRIER 50666 Carrier detected at 50666 bits s V 90 105 CARRIER 52000 Carrier detected at 52000 bits s K56 flex or V 90 106 CARRIER 53333 Carrier detected at 53333 bits s V 90 107 CARRIER 54000 Carrier detected at 54000 bits s K56 flex 108 CARRIER 54666 Carrier detected at 54666 bits s V 90 109 CARRIER 56000 Carrier detected at 56000 bits s K56 flex or V 90 3 S REGISTER REFERENCE Your modem has status registers These registers are memory locations inside your modem which control your modem s operation You usually do not have to worry about setting any register because the default values work for most applications The S registers are summarized in Fig 3 1 along with their default values Registers denoted with an may be stored in one of the two user profiles by entering the amp Wn command One of these profiles may be loaded at any time by using the Zn command The factory default values are stored in ROM and are loaded into the active configuration at power up or by the Zn command In addition the designated default profile is subsequently loaded and may change some of the factory default values The designated default profile can be changed by entering the amp Yn command where n is one of the two possible user profiles The factory defaults can be load
34. rdware flow control RTS CTS default amp K4 Enable bi directional XON XOFF flow control amp K5 Error amp Mn Asynchronous Communications Mode amp MO Asynchronous Mode default amp M1 Reserved amp M2 Reserved amp M3 Reserved amp M4 Reserved amp Pn Pulse Dial Make to Break Ratio Selection This command is effective only for Japan amp PO 33 66 make break ratio default amp P1 17 33 make break ratio 20 pps amp Qn Asynchronou Communications Mode amp Q0 Asynchronous Mode buffered Same as NO amp Q1 Reserved amp Q2 Reserved amp Q3 Reserved amp Q4 Reserved amp Q5 Error Control Mode buffered Same as N3 default amp Q6 Asynchronous Mode buffered Same as NO amp Q7 Reserved amp Q8 MNP error control mode If an MNP error control protocol is not established the modem will fallback according to the current user setting in S36 amp Q9 V 42 or MNP error control mode If neither error control protocol is established the modem will fallback according to the current user setting in S36 amp Sn Data Set Ready Option This command controls the functions of DSR DSR indicates when the modem is connected to a communications channel and is ready Async mode only If the modem is in Sync mode DSR is on during handshake and on line off in test or idle mode amp S0 DSR circuit always on default amp S1 DSR circuit on during handshaking and on line off in test modes or in idl
35. receded by amp amp Bn V 32 Auto Retrain This modem always auto retrains amp BO Disable V 32 auto retrain NOT SUPPORTED amp B1 Enable V 32 auto retrain default amp Cn Data Carrier Detect Option Async only This command controls how the state of the DCD or RLSD receive line signal detect relates to the carrier from the remote modem Always use amp C1 for Sync mode amp CO State of carrier from remote modem is ignored RLSD circuit is always on amp C1 State of carrier from remote modem is tracked RLSD circuit reflects the state of carrier default amp Dn Data Terminal Ready Option This command interprets how the modem will respond to the state of the DTR signal and changes to the DTR signal This is for amp MO0 only amp DO DTR ignored amp D1 Go to command mode on on to off DTR transition amp D2 Hang up and go to command mode on on to off DTR transition Autoanswer is disabled if DTR is low default amp D3 Reset on on to off DTR transition amp Fn Load Factory Settings This command loads the configuration stored and programmed at the factory This operation replaces all of the command options and the S register settings in the active configuration with factory values Note When this command is placed on the command line at the same time as another AT command the function of the command is ignored To load the factory settings this command must be issued by itself amp FO Recall factory se
36. result code is canceled Pertains to asynchronous operation only Range 0 127 ASCII decimal Default 10 Line Feed 5 Back Space lt BS gt Character user defined Sets the character recognized as a backspace Pertains to Asyncronous operation only The modem will not recognize the backspace character if it is set to a value that is greater than 32 ASCII This character can be used to edit a command line When the echo commands is enabled the modem echoes back to the local DTE the backspace character an ASCII space character and a second backspace character this means a total of three characters are transmitted each time the modem processes the backspace character Range 0 127 ASCII decimal Default 008 backspace S6 Wait Time for Dialing S6 controls how long the modem waits after it goes off hook before it dials the first digit of the telephone number The modem always pauses for at least 2 seconds even if S6 is set to less than two seconds If option X2 or X4 is in effect this option is ignored Range 2 65 seconds Default 2 S7 Wait for Carrier after Dial S7 controls how long the modem waits for a carrier signal from a remote modem after originating a call or from the calling modem after going off hook when answering a call S7 also controls how long the modem waits for a one second continuous dialtone after dialing a number followed by the W dial modifier If the modem detects a one second continuous dialtone within the spe
37. rs Each serial port in a personal computer has a different number CTS Clear To Send Default The assumed value that is used for a command parameter when no other value is explicitly provided DCD Data Carrier Detect DCE Data Communication Equipment DTE Data Terminal Equipment DTMF Dual Tone Multifrequency for touchtone dialing DTR Data Terminal Ready FSK Frequency Shift Keying Make Break Ratio The ratio of the off hook make to on hook break interval is the make break ratio in pulse dialing Modem A combination of the words MOdulator and DEModulator Modems transform digital data into analog signals and back again Nonvolatile Memory An area of memory inside the modem where the default configuration profile is stored Values recorded in this memory will not be lost when the power is turned off Off Hook The condition when the modem has picked up the telephone line Off Line Command State A modem state in which the modem accepts interprets and executes commands from an asynchronous computer or terminal On Hook The condition when the modem has not picked up the telephone line the telephone is hung up On Line A carrier signal link with a remote modem has been established communication is in progress On Line State A modem state in which the modem is connected with a remote modem Data can be sent or received from the remote modem in this state No commands will be accepted from the modem
38. ter three consecutive escape characters the default character is followed by AT lt CR gt After one more escape guard time one second the modem returns to the command state and sends the OK result code to the screen Note that the escape command is the only command that can be recognized by the modem in the on line state it cannot be recognized in the command state 2 4 Results Code The modem sends a response to the user via the screen after a command is issued As shown in the figure below there are two forms for each result code verbose code and digital code Numeric Verbose Description ANOaRWNM O OK CONNECT RING NO CARRIER ERROR CONNECT 1200 NO DIALTONE BUSY NO ANSWER dial modifier CONNECT 2400 CONNECT 4800 CONNECT 9600 CONNECT 14400 CONNECT 19200 CONNECT 16800 CONNECT 57600 CONNECT 7200 CONNECT 12000 Command executed Connection at any speed if X0 selected otherwise connection at 0 300bits s Ring signal detected Carrier signal not detected or lost Invalid command checksum error in command line or command line too long Connection at 1200bits s Disabled by X0 No dial tone detected Enabled by X2 X4 or W dial modifier Busy detected Enabled by X3 or X4 No silence detected when dialing a system not providing a dial tone Enabled by Connection at 2400 bits s Connection at 4800 bits s Connection at 9600 bits s Connection at 14400 bits s Connection at 19200 bits s Enabled by W
39. tting as active configuration amp F5 Recall factory settings appropriate for ETC mode as active configuration This command enables ETC operation It is automatically set upon detection of the cellular phone enable by the Cn command The following options are set with amp F5 Function MTC Implementation LAPM only error correction N4 Maximum block size 64 Modulation V 32bis S28 0 Transmit Level fixed per cell phone S92 Wait for Carrier 90 sec S7 90 CD loss delay 10 sec S10 100 Auto FF FB enabled N A Startup at 9600 S40 2 Selects V 22 when applicable B1 amp Gn Guard Tone Option This command determines which guard tone if any to transmit while transmitting in the high band answer mode This command is only used in V 22 and V 22bis mode amp GO No guard tones default amp G1 550 Hz guard tone amp G2 1800 Hz guard tone amp Jn Auxiliary Relay Option amp JO The auxiliary relay is never closed amp J1 NOT SUPPORTED responds ERROR amp Kn Select Flow Control This command selects the flow control method the modem chip set provides to the DTE to prevent the modem s buffer from overflowing with data A data buffer holds the data until the modem is ready to transmit it When the data buffer is full flow control instructs the DTE to stop sending to the modem while the modem continues to send characters amp KO Disable flow control amp K1 Reserved amp K2 Reserved amp K3 Enable bi directional ha
40. ulse dial T Touch tone dialing default Pause during dialing Pause for time specified in Register S8 before processing the next character in the dial string Ww Wait for dial tone Modem waits for a second dial tone before processing the dial string V The modem switches to speakerphone and dials the number An ATH command may be used to disconnect the voice call Wait for quiet answer Wait for five seconds of silence after dialing the number If silence is not detected the modem sends a NO ANSWER result code back to the user Hook flash Causes the modem to go on hook for 0 5 seconds and then return to off hook Return to command mode Causes the modem to return to command mode after dialing the number without disconnecting the call A Disable data calling tone transmission S n Dial a telephone number previously stored using the amp Zn x command see the amp Zn x command for further information The range on n is 0 3 Bong tone detection En AT Command Echo Options This command determines whether characters are echoed to the DTE from the modem when it is in command state EO Echo disabled E1 Echo enabled default Fn On Line Echo Command dummy command This command is used by some modems to determine whether characters are echoed to the DTE from the modem when it is in the on line state This modem does not support FO and will respond in error if this command is given This modem will accept F1 without
41. ys on line If the escape guard time is set at O seconds it is impossible to return the modem to command state Range 0 255 1 50 of a second Default 50 28 V 34 modulation Enable Disable This register enables disables V 34 modulation O disabled 1 255 enabled Range 0 255 Default 1 S30 Inactivity Timer S30 specifies the length of time in minutes that the modem will wait before disconnecting when no data is sent or received This function is only applicable to buffer mode Range 0 255 minutes Default 0 S35 Data Calling Tone Data Calling Tone is a tone of certain frequency and cadence as specified in V 25 which allows remote Data FAX Voice discrimination The frequency is 1300 Hz with a cadence of 0 5 s on and 2 s off O disabled 1 enabled Range 0 1 Default 0 S36 Negotiation Fallback This register specifies the action to take in the event of negotiation failure when error control is selected S36 0 2 Hang Up S36 1 3 Fallback to an asynchronous connection S36 4 6 Attempt MNP If MNP fails hang up S36 5 7 Attempt MNP If MNP fails fallback to asynchronous connection Default 7 37 Dial Line Rate S37 0 Maximum modem speed S37 1 Reserved 37 2 1200 75 bits s 37 3 300 bits s 37 4 Reserved 37 5 1200 bits s 37 6 2400 bits s S37 7 4800 bits s 37 8 7200 bits s S37 9 9600 bits s 37 10 12000 bits s S37 11 14400 bits s 37 12 16800 bits s 37 13 19200 bits s 37 14 21600 bits s
Download Pdf Manuals
Related Search