User Manual Interface Converter
Contents
1. gt RD CTS 5 6 DTR RD 12 TD SG 7 7 SG RD 24 lt TD DCD 8 8 DCD DTR 11 gt CTS DTR 23 gt CTS DSR 9 RTS DSR 21 lt RTS A440s used as RS 232 LINE EXTENDERS A common use for the A440 is to use them in pairs to provide a reliable line extension setup for RS 232 devices The following three diagrams show how two A440s may be used as RS 232 line extenders while adopting different RS 232 handshaking methods A440 User Manual 6 6 1 Example showing RTS CTS handshaking The following diagram shows A440s being used as line extenders in an RS 232 RTS CTS Handshaking situation In this example the Host is DTE and the Remote is DCE which allows the use of the same straight through cable for each RS 232 connection to the A440 Connect DTE DB 25 DCE FG FG 1 1FG 75SG TD 2 gt 2 RD 12 RD RD 3 4 3 TD 24 RD DTR 20 4 CTS 13 TD DSR 6 4 Y 5 RTS 4 25 TD SG 7 7 SG gt 9DSR DCD 8 8 DCD 21 DSR 4 _ 11 DTR _ 23 DTR 6 6 2 Example showing DTR DSR handshaking The following diagram shows A440s being used as line extenders in an RS 232 DTR DSR Handshaking situation In this example the Host is DTE and the R2. RD RD TD TD DSR DSR DTR DTR A440 User Manual User Device Cable End RS 232 Connection to a PC with DB 25 Serial Connector FG RD TD CTS RTS DTR DCE CH DB 25 Male DCD DSR RS 232 Connection to a PC with DB 9 Serial Connector RD TD CTS RTS DTR SG DCD DSR DCE CH DB 25 Male J O O1 R amp B D N Oo ON O O1 R P Shield Shield OnN O O1 BR ND 20 A ODON D W FG TD RD RTS CTS DSR SG DCD DTR TD RD RTS CTS DSR SG DCD DTR PC Cable End DTE LT DB 25 Female PC Cable End 00000 ED DB 9 Female A440 User Manual 6 4 6 5 6 6 RS 232 connection to other RS 232 Devices E E FG 1e _ Fe RD 2 4 in E a __ RD User Device DCE CTS 4 o RSS RTS 5 i CTs o o DTR 6 gt DSR _ Cable End sae 7e o s DB 25 Male DCD 8 6 C pep DSR 20 DTR Using RTS CTS Handshaking with the A440 The following diagram shows the A440 connected to a Host RS 232 serial device and a Remote RS 422 serial device In this example the Host is a DTE device so the A440 is selected as DCE on the RS 232 port A440 Connection B 25 DTE DCE FG 1 FG FG 1 _ FG TD 2 gt 2 RD SG 7 sG AD 3 4 3 TD TD 13 RD RTS 4 gt 20 DSR TD 25
3. safe level thereby protecting itself and other connected equipment from the common damage due to transients Transient voltage suppressor diodes are used on each RS 422 line Each diode has a response time of less than 1 ps with power dissipation of 600Watts for 1 ms and a steady state power dissipation rating of 5Watts CABLE REQUIREMENTS Alfatron recommends the use of shielded cable with its products It reduces Electro Magnetic Radiation and improves noise immunity This helps minimise interference to other equipment and improves communication reliability Cable Construction The recommended shielded cable construction is as follows Solder the shield surrounding cable wires to the Frame Ground FG pin If FG is not available use Signal Ground SG but in this case always use a separate wire for ground which is connected at both ends Make sure that the shield is connected at both ends of the cable Cable Diagrams Cable diagrams represent cable shield in the following manner FG amp 1 _ Ae Shield This shows the cable shield soldered to FG at both ends of the cable and shows the shield running the full length of the cable Please note that the shield is treated as a totally separate wire 6 0 6 1 6 2 6 3 CABLE EXAMPLES RS 422 Connection to Other RS 422 Devices FG SG TD TD RD ite DTR DB 25 Male DTR DSR DSR 13 25 12 24 11 23 21 Shield OUN FG SG
4. 0 has power Termination Resistors for RS 422 The A440 provides switch selectable termination resistors for the Receive Data RD and Data Set Ready DSR incoming lines Termination resistors are only required when the cable length exceeds 50 metres The A440 provides termination resistors on the receiver side only The reason for this is that in most environments cable lengths greater than 300 metres require termination only on the receiver side The location of termination resistor switch is at the side of the A440 as shown in Figure 1 The selection of the termination resistors is as follows Switch 1 Switch 2 Receive Data RD Data Set Ready DSR Termination Resistor Termination Resistor NOT ACTIVE NOT ACTIVE Termination Resistor Termination Resistor ACTIVE ACTIVE 3 0 RS 232 SERIAL PORT PINOUT The RS 232 Serial Port of the A440 is factory configuired as DCE 4 0 Pin NOORA WD NO O Note Status and Usage Used Ground Input Output Data Output Input Data Not used Pulled High 4K7 Not used Pulled High 4K7 Output Input Handshaking Used Ground Not used Pulled High 4K7 Input Output Handshaking A440 User Manual Set for DCE Set for DTE FG FG RD TD TD RD CTS RTS RTS CTS DTR DSR SG SG DCD DCD DSR DTR Pins 4 5 6 8 and 20 are pulled to the correct levels to allow a PC serial port to operate under most conditions without any additional loopb
5. User Manual ASeries A440 Interface Converter RS 232 lt gt RS 422 ALFATRON the Interfacing Specialists A440 User Manual A440 User Manual Version 1 00 Copyright 2003 Alfatron Pty Ltd April 2003 DISCLAIMER Alfatron Pty Ltd has made every attempt to ensure that the information contained in this document is accurate and complete Alfatron makes no representation or warranties of merchantability or fitness for any particular purpose Alfatron reserves the right to make changes to this document at any time without notice Therefore Alfatron assumes no liability for damages incurred directly or indirectly from errors omissions or discrepancies with the hardware and the manual TRADEMARKS All Company and Product names are trademarks of the Company or Manufacturer respectively WARRANTY Alfatron warrants its products against defects in materials and workmanship for a period of one year from receipt by the customer All warranty is carried out on a return to depot basis unless an alternative warranty coverage has been arranged WARRANTY EXCLUSIONS The above warranty shall not apply to defects resulting from improper or inadequate maintenance by the customer unauthorised modifications or misues operation outside the environmental specifications for the product damage due to power surges lightening strikes or any other phenomenon outside normal operational specifications DECLARATION OF CONFORMITY according to the Europ
6. ack connections The Factory Default RS 232 Serial switch setting is DCE as shown here RS 422A PORT PINOUT Pin 4 7 13 20 12 24 11 23 9 21 Status and Usage Signal Used Ground FG Used Ground SG Output Data TD Output Data TD Input Data RD Input Data RD Output Handshaking DTR Output Handshaking DTR Input Handshaking DSR Input Handshaking DSR DCE lt gt DTE CE Description Frame Ground Signal ground Transmit Data Transmit Data Receive Data Receive Data Data terminal ready Data terminal ready Data Set Ready Data Set Ready A440 User Manual 4 1 9 0 9 1 5 2 Transient Protection on RS 422 Port Power surges or electrical transient voltages can be induced into cabling by nearby lightening strikes electric motors switches and the operation of heavy industrial equipment to name a few The use of long cables as with RS 422 connections increases the exposure to transient voltages In an unprotected converter a transient of the correct magnitude can destroy the RS 422 transceiver chip on the RS 422 port However it is also possible for certain transients to pass through a converter and therefore damage any RS 232 attached equipment at the other end By using High Speed Transient Voltage Suppressors on the RS 422 port the A440 absorbs much of the transient energy on data lines and helps clamp these surge voltages to a
7. ean Commissions EMC Directive 89 336 EEC We Name of Manufacturer ALFATRON PTY LTD of Address of Manufacturer UNIT 9 36 NEW ST RINGWOOD VIC 3134 AUSTRALIA Australian Company Number ABN 65 005 410 819 declare under sole responsibility that the product Product Name ASeries RS 232 to RS 422 Interface Converter Model Number A440 to which this declaration relates is in conformity with the following standards CISPR 22 EN 55022 class B EMI from Information Technology Equipment ITE IEC 801 2 prEN55024 2 Electro Static Discharge Immunity IEC 801 3 prEN55024 3 Radiated RF Immunity IEC 801 4 prEN55024 4 Electrical Fast Transients Immunity N42 AUSTRALIAN MADE 1 0 A440 User Manual PRODUCT DESCRIPTION The ASeries A440 allows RS 232 serial devices to communicate with RS 422 devices As well as transferring data this unit also provides one pair of handshaking lines either DTR DSR or CTS RTS for the control of the data flow The following illustration shows the location of all the connectors indicators and switches of the A440 RS422 DC Power 4 Termination Resistor Jack Selection DIP la DCE lt gt DTE Selection Slide Switch Pp y Features Switch select the RS 232 port as either DCE or DTE Switch select Termination Resistors on the RS 422 port Transient protection using Transorbs LED indicators for Data Activity and Power Quality nickel plated metal case will with
8. emote is DCE which allows the use of the same straight through cable for each RS 232 connection to the A440 DTE DB 25 DCE FG 1 FG FG 1 FG FG 1 1 FG TD 2 gt 2RD SG 7 75SG TD 2 gt 2 RD RD 34 31D TD 13 12 RD RD 3 4 31D DSR 6 6 DTR TD 25 gt 24 RD DSR 6 6 DTR SG 7 7SG RD 12 13 TD SG 7 7 SG DCD 8 8DCD RD 24 25 TD DCD 8 8 DCD DTR 20 gt 20 DSR DTR 11 9DSR DTR 20 20 DSR DTR 23 21 DSR DSR 9 4 11 DTR DSR 21 23 DTR A440 User Manual 6 6 3 Example showing Xon Xoff handshaking 6 7 10 The following diagram shows A440s being used as line extenders in an RS 232 Xon Xoff Software Handshaking situation In this example the Host is DTE and the Remote is DCE which allows the use of the same straight through cable for each RS 232 connection to the A440 Connect DB 25 DCE Unused Handshake Lines Please note that many RS 232 devices still require their handshaking lines to be set to the correct levels even if Xon Xoff software handshaking is used When in doubt about any particular RS 232 device simply connect all the lines to the A440 RS 232 port as it will pull those lines to the correct leve
9. l for operation A440 User Manual 7 0 SPECIFICATIONS RS 232C Port RS 422A Port Transient Protection RS 422 Port only Handshaking LED Indicators Power Supply Dimensions Weight Operating Temperature Stroage Temperature Asynchronous RS 232C V 24 Select as DCE or DTE DB 25 female connector Speed capability dependant on cable length up to 64k bits per second RS 422A DB 25 female connector 120W Termination Resistor Selection for the incoming handshaking lines RD amp DSR Transient Voltage Suppression Diode Surge handling capacity 600W per wire 1ps Response time per diode lt 1ms Steady state power dissipation rate of 5W Xon Xoff Software Handshaking DTR DSR Hardware Handshaking Receive Data RS 232 Green Receive Data RS 422 Green Power Yellow 9V 200mA DC Power Adapter Reverse polarity protection Plug jack 5 5mm outer 2 5mm inner diameter Outer Negative O e 84mm x 58mm x 23mm 160 grams 10 to 35 C 0 to 45 C All specifications subject to change without notice 11
10. stand the most rugged application Using A440s as RS 232 Line Extenders A pair of A440s may be used to achieve connection of RS 232 devices over an extended distance The A440s are connected via their RS 422 ports to take advantage of the greater data transfer distances available using the RS 422 Serial protocol Please refer to Section 6 6 for cable details A440 User Manual 2 0 2 1 2 2 INSTALLATION The A440 does not require configuration but it does provide the convenience of being able to select the RS 232 port as either DCE or DTE Before connecting power to the unit please make sure that the RS 232 and RS 422 cables are securely connected to the A440 and associated devices Sections 5 and 6 contain details on cabling along with some examples of typical uses for the A440 After all cables have been connected and secured insert the power plug into the jack socket and turn the power ON The A440 is now ready for use Function of LED indicators The RS 232 LED indicator monitors the activity on the RD pin of the RS 232 serial port The LED will flash each time data is received by the A440 on this line The RS 422 LED indicator monitors the activity on the RD and RD data pair pins of the RS 422 serial port The LED will flash each time data is received by the A440 on these data pair lines The RS 232 and RS 422 LED indicators will not operate at any other time The Power LED will remain ON when the A44
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