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AC24AT/AC422AT USER'S GUIDE

1. D CONFIGURING THE COM PORT IN THE OPERATING SYSTEM If the COM port does not already exist in the operating system then it will have to be added If it does exist but the settings are different than the jumpers on the adapter card then the port will have to be modified Microsoft Windows NT Select the Start button then select Settings and Control Panel Double click on the Ports icon Add or modify the COM port as necessary Microsoft Windows 95 See Appendix B for instructions Microsoft Windows for Workgroups Open the Main program group then Control Panel and finally Ports Add or modify the COM port as necessary Microsoft DOS The COM port is simply accessed by the application software using the appropriate 1 0 port and IRQ settings The adapter card is seen by the computer s operating system as a standard COM port It uses the standard operating system API drivers so special software drivers are not needed The adapter card is not plug and play compatible If the computer has the plug and play feature turned on in the computer s BIOS then it must be turned off If the computer has COM1 and or 2 ports built into the mother board then it will not be possible to configure the adapter card with the same COM port settings without disabling the computer s built in COM port The computer s built in COM port must first be disabled by changing the enable status of the COM port in the computer s BIOS A computer s BI
2. AC24AT AC422AT User s Guide ADAPTER CARD INSTALLATION AC24AT AC422AT User s Guide CHAPTER 3 INSTALLING THE ADAPTER CARD FOR USE WITH DEVICES OTHER THAN OPTOMUX QUICK START D E Check available computer resources 1 0 port address and IRQ before installing the adapter card in the computer See Chapter 2 Step A Set jumpers for 1 0 port address group A jumpers and IRQ See Chapter 2 Step B Set communication jumpers group B amp C jumpers as well as the CTS DISABLE and 2 W jumpers See Communication Jumpers Section of Chapter 4 Configure the COM port in the operating system See Chapter 2 Step D Connect the communications cable between the adapter card and the Rs 422 or RS 485 device The following diagram shows the connection between the adapter card and another RS 422 485 device Please note that the transmit lines from the adapter card must be connected to the receive lines of the terminal or computer and vice versa See the section titled Communication Jumpers Group B amp C Jumpers CTS Disable and 2 W Jumpers earlier in this chapter for instructions on setting communication jumpers AC24AT AC422AT User s Guide ADAPTER CARD INSTALLATION cont 9PIN D SHELL CONNECTOR GROUND TRANSMIT RECEIVE TRANSMIT RECEIVE RECEIVE TRANSMIT RECEIVE TRANSMIT SHIELDED AC2AATIACA22AT CABLE WITH RS 422 485 PORT TWISTED PAIRS NOTE Termination resistors
3. hex number The number must be less than or equal to 3F8 and have a zero or an eight as the last digit Also the number must be chosen so that it will not conflict with the base 1 0 port address of any other devices in the computer 2 Translate the hex number to binary Each hex digit should be converted to 4 binary bits including leading zeros 3 Discard the first two zeros and the last three zeros 4 Invert the bits 5 Install a jumper in each location corresponding to a one The most significant bit corresponds to 9 and the least significant to AC24AT AC422AT User s Guide APPENDIX A DO Example using 1 0 port address 2F8 1 0 port address in hex 2 F 8 2 Convert to binary 0010 1111 1000 Delete leading two zeros and trailing three zeros 10 1111 1 4 Invert the bits 01 0000 0 5 Install jumper A8 remove jumpers A3 through A7 and 9 Correlation of bits to address jumpers 0 1 0 0 0 0 0 A9 A8 A7 A5 M AC24AT AC422AT User s Guide APPENDIX B APPLICATION NOTE AN9602 CONFIGURING THE AC24AT AC422AT AS A COM PORT IN MICROSOFT WINDOWS 95 When adding COM ports in Microsoft Windows 95 the operating system adds them sequentially Therefore if your system does not already have set up you will need to add COMS before you can add The following steps will walk you through setting up the adapter card as COM4 using
4. 3 4 Notes 1 3 4 Notes 1 3 4 Abbreviations TX Transmit T Terminate TO To Optomux RX Receive T B Terminate and Bias FH From Host XMT Transmit TH To Host REC Receive FO From Optomux Notes 1 If the transmitter on an RS 422 data link is disabled when not transmitting then biasing is required If the transmitter is left enabled when not transmitting then biasing is not required However biasing of the data link is acceptable as long as the data link is biased only at one location 2 The RS 422 communications cable is composed of two twisted pairs of two wires each for the two RS 422 data links plus a separate wire for the signal common typically from a third or fourth pair plus an overall cable shield 2 The FO terminals of the last Optomux brain board do not have any connections In order to prevent noise at the FO terminals from being interpreted as valid data signals termination and biasing is necessary For consistency the FO terminals on the adapter card and all of the Optomux brain boards are biased 5 When Optomux is used in Repeat Mode each data link is RS 422 and the transmitters are always enabled A AC24AT AC422AT User s Guide APPENDIX D RS 485 An RS 485 data link a single twisted pair of two wires can have multiple transmitters and multiple receivers Because of this only one data link a single twisted pair of two wires is necessary for two way communications when using RS
5. 485 This is sometimes referred to as RS 485 2 wire mode Block Diagram of 5 485 DATA Link 2 Wire Mode This methodology is used with Opto 22 Mistic Bricks and can also be used with the SNAP B3000 brain when set up for 2 wire communications REA es gepas lt RS 485 Data Link gt Soo 5s hes gt T TX RX TX RX TX RX TX RX First Device Device Device Last Device Abbreviations TX RX Transmit Receive T Terminate T B Terminate and Bias Notes 1 Both ends of the RS 485 Data Link must be terminated 2 The RS 485 Data Link must be biased in only one location 3 The RS 485 communications cable is composed of one twisted pair of two wires for the RS 485 data link plus a separate wire for the signal common typically from a second pair plus an overall cable shield RS 422 485 An RS 422 485 communication link consists of one RS 422 data link and one RS 485 data link However RS 485 4 wire mode is actually made up of two RS 485 data links one link for transmitting from the host or master to the slave devices and the other link for transmitting responses from the slave devices to the host When Opto 22 Classic Optomux B1 and B2 is used in Multi drop mode it uses a communication link which is a combination of one RS 422 data link and one RS 485 data link The RS 422 data link connects the transmitter on the adapter card in the host computer to the receivers on all the Optomux brain boards Because the
6. Guide TROUBLESHOOTING AND TESTING a 2 IfXMT TX LED on the brain board did not blink then the brain board did not understand the message or the message address did not match the brain board address Verify the operating system COM port settings for all the communication parameters baud rate data bits stop bits and parity In addition verify that the hex address sent in the message matches the brain board address jumper settings 3 Did the REC RX LED on the adapter card blink If it did then the adapter card received the response from the brain board go to the next step If the LED did not blink then it is probably a communication wiring problem Double check the communication wiring Refer to the Optomux wiring diagrams in Chapter 2 4 Thecorrect response on the HyperTerminal screen is the letter A without the quotation marks If this response did show up on the HyperTerminal screen then the adapter card is communicating properly with the Optomux brain board If there was no response on the HyperTerminal screen there are two possible causes First there may be an IRO conflict between the adapter card and another device in the computer Second the IRQ setting of the COM port in the operating system may not match the IRQ setting of the adapter card See Chapter 2 If there was a response on the HyperTerminal screen but it included garbage characters then verify the termination and biasing jumper settings
7. the Product Support engineer Software and version being used Controller firmware version PC configuration A complete description of your hardware and operating systems including jumper configuration accessories installed such as expansion daughter cards type of power supply types of 0 units installed third party devices installed e g barcode readers Specific error messages seen AC24AT AC422AT User s Guide APPENDIX F AC24AT AC422AT User s Guide
8. to allow two way communications two data links two twisted pairs with two wires each is necessary This is typically referred to as RS 422 However RS 422 4 wire two data links communications only allows two devices to be on the communications link because each data link can only have one transmitter Opto 22 products in general do not use RS 422 4 wire communications with the exception of Classic Optomux B1 amp B2 when used in Repeat mode Block Diagram of RS 422 Data Link with Multiple Receivers This diagram shows the methodology used for the RS 422 half of the RS 422 485 Communications Link used by Optomux in Multi drop mode gt gt gt 5 422 Data Link Note 2 gt gt gt gt Note 1 T B ay Last Device TX First Device PR AC24AT AC422AT User s Guide APPENDIX D Block Diagram of RS 422 Point to Point Communications Link This diagram shows the methodology used by Optomux in Repeat mode Note 1 RS 422 Data Link Note 2 Device 1 Device 2 Note 1 RS 422 Data Link Note 2 Block Diagram of Classic Optomux B1 s and B2 s in Repeat Mode RS 422 Data Link Note 2 RS 422 Data Link Note 2 RS 422 Data Link Note 2 T XMT TX TO TO FH TO Optomux Optomux o Last Adapter Card Brain Brain ptomux Note 5 Brain Note 5 REC RX FO FO TH FO T B RS 422 Data Link Note 2 RS 422 Data Link Note 2 RS 422 Data Link Note 2 Note 3 Notes 1
9. transmitter on the adapter card is the only transmitter on the RS 422 data link it can be left enabled all the time and biasing is not necessary The RS 485 data link connects the transmitters on all the Optomux brain boards to the receiver on the adapter card in the host computer Because there are multiple transmitters on the RS 485 data link the transmitters get disabled when not transmitting which is a function of the Optomux brain board so the data link needs to be biased This is done by installing biasing jumpers B5 and B6 on the adapter card Sometimes this is referred to as RS 485 4 wire mode AC24AT AC422AT User s Guide APPENDIX D Block Diagram of RS 422 485 Communications Link used by Classic Optomux B1 amp B2 in Multi drop Mode TO FH TO FH TO FH TO Adapter Card Brain Board Brain Board Last Brain Board TH FO TH TH FO gt gt gt RS 422 Data Link gt gt gt gt Note 1 T B eeu es RS485Datalink lt Boos lt Abbreviations TO To Optomux T Terminate FH From Host T B Terminate and Bias TH To Host XMT Transmit FO From Optomux REC Receive N C No Connection RS 422 Data Link Notes f If the transmitter on RS 422 data link is disabled when not transmitting then biasing is required If the transmitter is left enabled when not transmitting then biasin
10. 1 0 port address 340 and IRQ 5 These steps assume the system currently has only COM1 and COM installed 1 gt 5 co N o gt N Open Control Panel Double click the Add New Hardware icon On the Add New Hardware Wizard click Next On the next step you will be asked if you want Windows to auto detect your hardware select No then click Next On the next step you will be shown a list of hardware types Scroll down and select Ports COM and LPT then select Next The next step will show you a list of manufacturers and models Select Standard Port Types and Communications Port then click Next You will now be shown the input output range and interrupt request Click Next At the final Wizard step click Finish At the Systems Settings Change dialog select 10 is now installed 11 For COM4 repeat steps 2 through 9 Open Control Panel Double click the System icon Select the Device Manager tab Double click Ports it should expand showing four COM ports Double click Select the Resources tab Remove the checkmark from the Use automatic settings box Change the Settings Based On drop down box to Basic Configuration 8 18 Click the Change Settings button AC24AT AC422AT User s Guide APPENDIX B X 19 Change the Value to 0340 0347
11. 220 ohms may need to be added at but external to the last device on the communication link Check with the manufacturer of the device to determine whether the device has termination resistors internally Figure 3 1 Connection between the adapter card and another RS 422 485 device Figure 3 2 J1 9 Pin D Shell female Connector When communicating via RS 422 or RS 485 to other non Opto 22 devices termination provisions may not be available on the devices It may be necessary to install 220 ohm terminating resistors at but external to the device AC24AT AC422AT User s Guide CHAPTER 4 TECHNICAL INFORMATION RECOMMENDED RS 422 485 COMMUNICATION CABLES The following cables are recommended for RS 485 422 serial communications Although you may elect to use other cables keep in mind that low capacitance less than 15 pF ft is important for high speed digital communication links The cables listed below are all 24 gauge 7x32 stranded with 100 ohm nominal impedance and a capacitance of 12 5 pF ft Select from the following four three and two pair cables depending on your application needs All will yield satisfactory results It is recommended that you choose a cable with one more pair than your application requires Use one of the extra wires rather than the shield for the common When communicating via 4 wire RS 422 485 a shielded three twisted pair six conductors plus shield cable is recommended Pair 1 is us
12. AC24AT AC422AT USER S GUIDE Form 166 040823 August 2004 22 43044 Business Park Drive Temecula CA 92590 3614 Phone 800 321 OPTO 6786 or 951 695 3000 Fax 800 832 OPTO 6786 or 951 695 2712 Internet Web site www opto22 com Product Support Services 800 TEK OPTO 835 6786 or 951 695 3080 Fax 951 695 3017 E mail support opto22 com Bulletin Board System BBS 951 695 1367 http bbs opto22 com 24 hours a day 7 days a week AC24AT amp AC422AT User s Guide Form 166 040823 August 2004 All rights reserved Printed in the United States of America The information in this manual has been checked carefully and is believed to be accurate however Opto 22 assumes no responsibility for possible inaccuracies or omissions Specifications are subject to change without notice Opto 22 warrants all of its products to be free from defects in material or workmanship for 30 months from the manufacturing date code This warranty is limited to the original cost of the unit only and does not cover installation labor or any other contingent costs Opto 22 I O modules and solid state relays with date codes of 1 96 or later are guaranteed for life This lifetime warranty excludes reed relay SNAP serial communication modules SNAP PID modules and modules that contain mechanical contacts or switches Opto 22 does not warrant any product components or parts not manufactured by Opto 22 for these items the warranty from the o
13. AT User s Guide CHAPTER 2 INSTALLING THE ADAPTER CARD FOR USE WITH OPTOMUX IN RS 422 485 4 WIRE MODE QUICK START The following steps are detailed in this chapter A Check available computer resources 1 0 port address and IRQ before installing the adapter card in the computer Set jumpers for 1 0 port address and IRQ Set communication jumpers Configure the COM port in the operating system m c o mg Connect the communications cable between the adapter card and the Optomux system A CHECKING AVAILABLE COMPUTER RESOURCES It is best to identify which 1 0 port addresses and IRQ settings are available on the computer before installing the adapter card The following tools are available to help with this Microsoft Windows NT Windows NT Diagnostics can be accessed by selecting the Start button Programs Administrative Tools Common and Windows NT Diagnostics Once it is started select the Resources Tab and then the IRQ and 1 0 Port buttons one at a time Microsoft Windows 95 Device Manager can be accessed by selecting the Start button Settings and Control Panel Double click on the System icon Select the Device Manager Tab highlight Computer and then click the Properties button Then select the Interrupt request IRQ button and the Input output 0 button one at a time Microsoft Windows for Workgroups Microsoft Diagnostics MSD can be accessed by exiting Microsoft Windows From the DOS prompt
14. B1 amp B2 are limited to 38 4 kbaud AC24AT AC422AT User s Guide INTRODUCTION GROUPB GROUP C TERMINATION AND BIASING TERMINATION AND BIASING JUMPERS FOR XMT TO AND REC FO LINES JUMPERS FOR RTS AND CTS LINES SERIAL CONNECTION COMMUNICATIONS PINE SIGNAL JUMPER FUNCTIONWHEN INSTALLED e FI E ii 1 GB 2 RTE 3 GROUND C3 B3 TX PULLDOWN XMT LED mu E 5 TRANSMITS 6 6 Bx PULL DOWN 1 Slat RIS CONTROLLED DROP e REC LED 8 RECEVE en CTS CONTROLLED MULTI DROP ope 3 ADDRESS SELECTION DEVICE INTERUPTION JUMPER ADDRESS JUMPER TOMI TOMT NONE com 2 GOO Cow READ MANUAL BEF ORE OPERATING 8 ote RTS LED 22 CTS LED IRQ JUMPERS GROUP A CTS JUMPER PORT ADDRESS JUMPERS 2 W JUMPER GROUP B GROUP C TERMINATION AND BIASING TERMINATION AND BIASING JUMPERS FOR XMT TO AND REC FO LINES JUMPERS FOR RTS AND CTS LINES 222 a u XMT LED 8 REC LED Se RN4 02 nrpe ER RTS LED bl 1 1 1 AC422AT CTS LED sec user MANUAL OPTO 22 IRQ JUMPERS GROUPA CTS DISABLE JUMPER IO PORT ADDRESS JUMPERS Figure 1 1 AC24AT top and AC422AT bottom Revised 12 4 98 AC24AT AC422AT User s Guide INTRODUCTION AC24AT AC422
15. NECTOR This can be helpful to determine if the communication problem is caused by other RS 422 485 devices external to the computer or if the problem is limited to the adapter card operating system and software being used DB9 loop back connector can be constructed by tying pin 4 to pin 8 and pin 5 to pin 9 This will take the data going out of the adapter card s RS 422 485 transmit lines and send it back into the adapter card s RS 422 485 receive lines If the RTS and CTS lines are being used then tie pin 1 to pin 6 and pin 2 to pin 7 This will tie the RTS output lines to the CTS input lines CN G hwhn Figure 49 1 Loop back Connector AC24AT AC422AT User s Guide TROUBLESHOOTING AND TESTING wm Remove the communication cable from the adapter card and plug the loop back connector into the adapter card Use a software program such as HyperTerminal Microsoft Windows 95 and NT Windows Terminal Microsoft Windows or LCTERM DOS to send data to the adapter card Be sure to set flow control for None If RTS is tied to CTS then set flow control to Hardware Because of the loop back connector any data sent to the adapter card will be transmitted out the transmit TX terminals looped back into the receive RX terminals and finally sent back to the computer through the adapter card Whatever is typed on the keyboard of the computer should be displayed on the computer s monitor
16. OM 4 0 RS 422 485 015 P 555 AAA Veo 4 Ed 3 cls 7 Mem Figure 4 1 Simplified schematic showing the Group B amp C jumpers BIASING JUMPERS The biasing jumpers are B1 and B3 for the transmit pair B5 and B6 for the receive pair C1 and C3 for the RTS pair C5 and C6 for the CTS pair AC24AT AC422AT User s Guide TECHNICAL INFORMATION M RS 485 data links must be biased at one and only one location on the data link The adapter card is a convenient and consistent location to bias the RS 485 communication link so the default is that jumpers B5 B6 C5 and C6 are installed Jumpers B1 and installed connect 470 ohm biasing resistors between 5 VDC and the TO terminal and between the TO terminal and signal common respectively This biases the transmit TO pair of wires Jumpers B5 and B6 installed connect 470 ohm biasing resistors between 5 VDC and the FO terminal and between the FO terminal and signal common respectively This biases the receive FO pair of wires Jumpers C1 and C3 installed connect 470 ohm biasing resistors between 5 VDC and the RTS terminal and between the RTS terminal and signal common respectively This biases the RTS pair of wires Jumpers C5 and C6 installed connect 470 ohm biasing resistors between 5 VDC and the CTS terminal and between the CTS terminal and signal common respectively This biases the CTS pair of wires See Appendix D for a more det
17. OM CONNECTOR 5 AT THE OTHER END OF THE DO NOT CO CONNECTOR STRIP NECT ANY COM POINT TO EARTH GROUND TO TO OPTOMUX FO FROM OPTOMUX TH TO HOST FH FROM HOST SHIELD DRAIN WIRE NOTE DO NOT TIE TO EARTH GROUND OPTOMUX B1 or B2 OPTOMUX B1 or B2 2 cow TO TH FH FO REPEATMODE MIDDLE OF LINK ENDOF LINK 2 01234526728 9 t0 01234528678 9 10 N GROUP AJUMPERS 0 10 N GROUP A JUMPERS 0 10 MULTIDROP MODE MIDDLE OF LINK ENDOFLINK TERMINATED CEE mmm 10 0 0123456 78969 1234256 7 8 9 10 N GROUP A JUMPERS 0 10 N GROUP A JUMPERS 0 10 JUMPER INSTALLED 8 JUMPER REMOVED Figure 2 4 RS 422 485 Wiring from Adapter Card to Classic Optomux Brain Board B1 or B2 The overall cable shield drain wire should NOT be tied to earth ground at any location because it is being used as the logic common for the network For details on connecting multiple Optomux brain boards to the RS 422 485 communication cable please see the Optomux and B2 Data Sheet form 463 AC24AT AC422AT User s Guide ADAPTER CARD INSTALLATION Wiring Diagrams For Connecting to SNAP OptomuX B3000 Standard Configuration This Standard Configuration is highly recommended and provides the best noise immunity The first pair of twisted wire connects the TX and TX termin
18. OS settings can typically only be accessed during the initial boot sequence when starting or restarting the computer AC24AT AC422AT User s Guide ADAPTER CARD INSTALLATION E CONNECTING THE ADAPTER CARD TO THE OPTOMUX NETWORK For this connection Opto 22 recommends that a cable with three or four twisted pairs and an overall shield be used This will provide a total of 6 or 8 wires in addition to the shield drain wire All conductors should be stranded 22 or 24 gauge with a nominal impedance of 100 ohms and a capacitance of 12 5 pF ft See Chapter 4 Technical Information Recommended RS 422 485 Communication Cables Notes ACZAAT Signal common is NOT tied to the computers ground and should NOT be tied to earth ground at any location 422 Signal common is tied to the computer s ground and should NOT be tied to earth ground at any other location Wiring Diagrams For Connecting to Classic OptomuX B1 amp B2 Standard Configuration This Standard Configuration is highly recommended and provides the best noise immunity The first pair of twisted wire connects the and TO terminals on the adapter card to the FH and FH terminals on the Optomux unit TO to FH and TO to FH The second pair of twisted wire connects the FO and FO terminals on the adapter card to the TH and TH terminals on the Optomux unit One wire from the third pair of twisted wire connects the LOGIC GND terminal on the adapter card to the COM te
19. RS 422 data link allows only one transmitter however multiple receivers are allowed One way RS 422 communication can be accomplished with a single data link one twisted pair Two way RS 422 communication requires two data links two twisted pairs as part of a communication cable Because RS 422 only allows one transmitter per data link RS 422 is commonly used for point to point communications between two devices RS 422 485 A communication link composed of one RS 422 data link and one RS 485 data link The RS 422 data link connects the transmitter of the host or master device to the receivers of the slave devices The RS 485 data link connects the transmitters of the slave devices to the receiver of the host master device This is an example of full duplex communications RS 485 A communication standard based on the differential voltage between the two wires ina twisted pair Because RS 485 is based on differential voltages it provides a high degree of noise immunity An RS 485 data link allows multiple transmitters and multiple receivers Two way RS 485 communication requires only one data link a single twisted pair as part of a communication cable RS 485 2 WIRE MODE RS 485 two way communications accomplished with a single data link a single twisted pair as part of a communication cable This is an example of half duplex communications RS 485 4 WIRE MODE RS 485 two way communications accomplished with two RS 485 data links two twis
20. The Conflict Information box should show no device conflicts Click the OK button 20 Select Interrupt Request in the Resource Settings box 21 Click the Change Settings button 22 Change the Value to 5 The Conflict Information box should show no device conflicts Click the OK button 23 Inthe Communication Port Properties dialog select OK 24 Atthe Systems Settings Change dialog select No 25 nthe Systems Properties dialog box select Communication Port COM3 26 Clickthe Remove button 27 When asked if you are sure click OK 28 In the Systems Properties dialog box click the Close button 29 When prompted to restart your system click Yes 30 You re done AC24AT AC422AT User s Guide O AP PEN DIX NOTES REGARDING EARLIER VERSIONS OF THE ADAPTER CARD 1 Earlier versions of the adapter cards used pins 1 and 3 for ground If replacing an earlier version with a current model change the ground connection to pin 3 only An early version adapter can be identified by having only two LED s XMT and REC visible from the back of the bracket Current version adapter cards have an additional set of LED s for RTS and CTS handshake lines Some intermediate version adapter cards have all four LEDs XMT REC RTS and CTS but do not have a CTS Disable jumper If the card does not have the CTS Disable jumper and RTS CTS handshake functionality will not be used t
21. While keys are being typed the TX and RX LEDs on the adapter card should be blinking 1 If data that is typed on the keyboard of the computer is displayed on the computer s monitor then the adapter card is functioning correctly 2 If the TX LED blinks this indicates the adapter card received the data from the computer and that it transmitted it out the transmit TX terminals If the TX LED does not blink then there is probably a difference between the 1 0 port jumper settings on the adapter card and the 1 0 port address settings of the COM port in the operating system Refer to the Chapter 2 4 If the TX and RX LEDs blink but nothing is being displayed on the computer s monitor then the cause of the problem is probably related to the IRQ setting of the adapter card There may be a mismatch between the IRQ setting on the adapter card and the IRQ setting for the COM port in the operating system Refer to the Chapter 2 b There may be a conflict between the IRQ setting on the adapter card and another device in the computer In other words two devices one of which being the adapter card in the computer may be set for the same IRQ Refer to the Chapter 2 c The terminal program may be configured for the wrong IRQ This is typically only the case with DOS applications Refer to the documentation for the terminal program being used Note Any or all of these conditions may need to be corrected AC24AT AC422AT User s Gu
22. addition to the IRQ jumper install the CTS CTS DISABLE jumper 2 3 Remove the 2 W jumper AC24AT only 4 5 B Microsoft Windows operating systems standard is that COM1 amp COMS share the same IRQ 4 Select different IRQ if COM1 is being used in this computer Microsoft Windows operating systems standard is that COM2 amp share the same IRQ 3 Select a different IRQ if COM2 is being used in this computer The Microsoft Windows 95 operating system uses IRQ 2 Do not set the adapter card for IRQ 2 when using the adapter card in Windows 95 IRQs 6 and 7 are also available on the adapter card AC24AT AC422AT User s Guide ADAPTER CARD INSTALLATION C SETTING COMMUNICATION JUMPERS Figures 2 1 and 2 2 show the correct jumper arrangement for all group B group C and CTS jumpers on the adapter card for use with Optomux These jumper settings are the defaults set at the factory JOE CREKEEE DENOTES JUMPER INSTALLED DENOTES JUMPER NOT INSTALLED Figure 2 1 AC24AT Group B and C Jumpers amp CTS and 2 W Jumper Arrangements OBS DENOTES JUMPER INSTALLED B DENOTES JUMPER NOT INSTALLED z om 9 Sog O m um c duc ocu C 5 a SS Figure 2 2 AC422AT Group B and C Jumpers amp CTS Jumper Arrangements The adapter card is now ready to be plugged into any open ISA slot in the computer AC24AT AC422AT User s Guide ADAPTER CARD INSTALLATION
23. ailed discussion of biasing requirements Termination Jumpers The termination jumpers are B2 for the transmit pair B4 for the receive pair C2 for the RTS pair C4 for the CTS pair RS 422 and RS 485 communication links must be terminated at both ends of the communication link Each twisted pair of wires used for transmitting or receiving data must be terminated at both ends of the communication cable Because the adapter card is typically located at one end of the COM link the default is that jumpers B2 B4 C2 and C4 are installed If the adapter card is not physically located at one end of the communications link or the other then jumpers B2 B4 C2 and C4 should be removed Jumper B2 installed connects a 220 ohm terminating resistor between the TO terminal and the TO terminal This terminates the transmit TO pair of wires Jumper installed connects a 220 ohm terminating resistor between the FO terminal and the FO terminal This terminates the receive FO pair of wires Jumper C2 installed connects a 220 ohm terminating resistor between the RTS terminal and the RTS terminal This terminates the RTS pair of wires Jumper B4 installed connects a 220 ohm terminating resistor between the CTS terminal and the CTS terminal This terminates the CTS pair of wires See Appendix D for a more detailed discussion of termination requirements AC24AT AC422AT User s Guide TECHNICAL INFORMATION 4 A Ju
24. als on the adapter card to the RX and RX terminals on the Optomux unit to RX and TX to RX The second pair of twisted wire connects the RX and RX terminals on the adapter card to the TX RX and TX RX terminals on the Optomux unit One wire from the third pair of twisted wire connects the LOGIC GND terminal on the adapter card to the COM terminal of the Optomux unit Finally the overall cable shield drain wire should be tied to earth ground at only one of its two ends STANDARD 4 WIRE CONFIGURATION B3000 COMMUNICATION B3000 COMMUNICATION OVERALL CABLE SHIELD CONNECTOR J2 7 TERMINAL CONNECTOR J2 7 TERMINAL AC422AT 4 WIRE NON TERMINATED 4 WIRE TERMINATED EARTH GND MIDDLE OF LINK END OF LINK NOTE IN THIS EXAMPLE THE CABLE SHIELD BEEGEEEES IS NOT ELECTRICALLY CONNECTED TO THE R 485 COM COMMON TERMINALS CURE NUR D E 124 DO NOT CONNECT ANY COMPOINT TO 8 JUMPERS 0 8 EARTH GROUND JUMPER INSTALLED JUMPER REMOVED Figure 2 5 RS 422 485 Wiring from Adapter Card to Optomux SNAP B3000 Brain AC24AT AC422AT User s Guide ADAPTER CARD INSTALLATION i Alternate Configuration This Alternate Configuration uses a cable with only two twisted pairs and an overall shield and is acceptable in most cases However it provides less noise immunity because the shield is not used as a shield it is used as a convenient extra wire for the logic common for the n
25. are settings match the brain board settings for address baud rate parity data bits stop bits communication mode ASCII vs Binary if applicable and protocol e g Optomux 1 0 protocol vs Mistic 1 0 protocol etc Did the REC RX LED on the adapter card blink If it did then the adapter card received the response from the brain board go to the next step If the LED did not blink then it is probably a communication wiring problem Double check the communication wiring Refer to the Optomux wiring diagrams in Chapter 2 If the software did not receive the response from the adapter card there are a few possible causes First the timeout may not be long enough so try using a longer time out value Second there may be an IRQ conflict between the adapter card and another device in the computer Third the IRQ setting of the COM port in the operating system may not match the IRO setting of the adapter card See Chapter 2 If the software did receive the response but it was garbled or contained a checksum or CRC error then the problem may be the communications wiring or termination and biasing of the RS 422 485 communications link See Chapter 2 as well as the documentation for the Optomux brain boards AC24AT AC422AT User s Guide TROUBLESHOOTING AND TESTING IO TESTING OPTOMUX COMMUNICATION THROUGH THE ADAPTER CARD USING HYPERTERMINAL A HyperTerminal Installation HyperTerminal is a communicat
26. csson All other brand or product names are trademarks or registered trademarks of their respective companies or organizations AC24AT AC422AT User s Guide TABLE OF CONTENTS Chapter 1 Introduction Product Description MR Summary of Features TP Chapter 2 Installing the Adapter Card for use with Optomux In 5 422 485 4 wire Mode QUICK Stati MN m M A Checking Available Computer B Setting Jumpers for I O Port Address and IRQ C Setting Communication Jumpers een D Configuring the COM Port in the Operating System E Connecting the Adapter Card to the Optomux Network Wiring Diagrams For Connecting to Classic Optomus B1 amp B2 Wiring Diagrams For Connecting to SNAP OptomuX B3000 Chapter 3 Installing the Adapter Card for use with Devices Other Than Optomux Quick Start Chapter 4 Technical Information Recommended RS 422 485 Communication Communication JulripBls uiae qiti Puede sued Biasing JUMPE S E Termination Jumpers teen Jumpers for Controlling the Transmitter on the Adapter Card Oth
27. ed for transmit pair 2 is used for receive and pair 3 is used to connect the logic common When communicating via 2 wire RS 485 a shielded two twisted pair four conductors plus shield cable is recommended Pair 1 is used for transmit receive data and pair 2 is used to connect the logic common Four Pair e Belden P N 8104 with overall shield e Belden P N 9728 individually shielded e Belden P N 8164 individually shielded with overall shield e Manhattan P N M3477 individually shielded with overall shield e Manhattan P N M39251 individually shielded with overall shield Three Pair e Belden P N 8103 with overall shield e Belden P N 9730 individually shielded e Belden P N 8163 individually shielded with overall shield e Manhattan P N M3476 individually shielded with overall shield e Manhattan P N M39250 individually shielded with overall shield AC24AT AC422AT User s Guide TECHNICAL INFORMATION 4 Two Pair e Belden P N 8102 with overall shield e Belden P N 9729 individually shielded e Belden P N 8162 individually shielded with overall shield e Manhattan P N M3475 individually shielded with overall shield e Manhattan P N M39249 individually shielded with overall shield COMMUNICATION JUMPERS MULTI DROP Bio r9 o AAA Vee CONTROL J14 5 2 Plo Ae Vec j FROM RTS 3 o gt 3 E OF UART J12 Br 4 Bo we RX FR
28. er JUMPS c CER Using the AC24AT RS 485 2 Wire 040 Chapter 5 Troubleshooting and Testing esie Troubleshooting the Adapter Card with a Loop back Connector Troubleshooting Optomux Communications Using LED Indicators Testing Optomux communication Through the Adapter Card Using HyperTerminal A HyperTerminal Installation een B HyperTerminal Session Configuration sss Transmitting Characters to the Optomux Brain Boards D Transmitting Optomux Protocol Messages to the Optomux Brain Boards AC24AT AC422AT User s Guide 19 19 21 21 22 22 23 24 24 25 27 27 27 29 30 E gee 20 31 Appendix A Address Jumpers Group A Jumpers seeeeens n Procedule etie eiii E Appendix Application Note AN9602 Configuring the AC24AT AC422AT as a COM Port Microsoft Windows 95 wa Appendix C Notes Regarding Earlier Versions of the Adapter Card Appendix D RS 422 and RS 485 as used with Opto 22 Products General Mr t Block Diagram of RS 422 Data Link with Multiple Receivers Block Diagram of RS 422 Point to Point Com
29. etwork The first pair of twisted wire connects the TX and TX terminals on the adapter card to the RX and RX terminals on the Optomux unit to RX and TX to RX The second pair of twisted wire connects the RX and RX terminals on the adapter card to the TX and TX terminals on the Optomux unit The overall cable shield drain wire connects the LOGIC GND terminal on the adapter card to the COM terminal of the Optomux unit ALTERNATE 4 WIRE CONFIGURATION ACCEPTABLE FOR MOST CONDITIONS 83000 COMMUNICATION 83000 COMMUNICATION OVERALL CABLE SHIELD CONNECTOR J2 7 TERMINAL CONNECTOR J2 7 TERMINAL AC422AT AC24AT SHIELD DRAIN WIRE 4 WIRENON TERMINATED NOTE DO NOT TIE TO 4 WIRE TERMINATED MIDDLE OF LINK EARTH GROUND END OF LINK NOTE IN THIS EXAMPLE THE CABLE SHIELD IS CONNECTED TO THE RS 485 COM COMMON TERMINALS BUT THE SHIELD IS NOT EARTH GROUNDED 0123456878 012345878 DO NOT CONNECT ANY COMPOINT TO COMMUNICATION JUMPERS 0 8 COMMUNICATION JUMPERS 0 8 EARTH GROUND JUMPER INSTALLED REMOVED Figure 2 6 RS 422 485 Wiring from Adapter Card to Optomux SNAP B3000 Brain The overall cable shield drain wire should NOT be tied to earth ground at any location because it is being used as the logic common for the network For details on connecting multiple Optomux brain boards to the RS 422 485 communication cable please see the B3000 data sheet form 787
30. g is not required However biasing of the data link as acceptable as long as the data link is biased only at one location This diagram shows the methodology used for the RS 422 half of the RS 422 485 Communications Link used by Optomux in Multi drop mode When Classic Optomux brain boards B1 amp B2 are set up for Multi drop mode then the jumpers internally tie the FH terminals to the TO terminals and the FO terminals to the TH terminals When Classic Optomux brain boards B1 amp B2 are set up for Multi drop mode then the jumpers internally disconnect the transmitter circuitry from the TO terminals to allow the data link to operate in RS 422 multidrop mode RS 485 Data Link Notes f 2 3 4 5 Both ends of the RS 485 Data Link must be terminated RS 485 Data Link must be biased in only one location This is the methodology used for the RS 485 half of the RS 422 485 Communications Link used by Optomux in Multi drop mode When Classic Optomux brain boards B1 amp B2 are set for Multi drop mode then the jumpers internally cause the TH transmitter to disable when not transmitting When Classic Optomux brain boards B1 amp B2 are set up for Multi drop mode then the jumpers internally disconnect the receive circuitry from the FO terminals RS 422 485 Communications Cable Notes 1 The RS 422 485 communications cable is composed of two twisted pairs of two wires each one for the RS 422 data lin
31. handshake lines are NOT being used To enable CTS functionality remove the CTS DISABLE jumper If the adapter card does not have a CTS DISABLE jumper then see Appendix C for important information Jumper B8 AC422AT only Jumper B8 is only found on the AC422AT This jumper is reserved and should never be installed 2 W jumper The 2 W jumper is only found on the AC24AT card When this jumper is installed the receiver is disabled when the transmitter is transmitting This jumper should be removed for normal RS 422 485 4 wire mode operation For more information see the next section Using the AC24AT RS 485 2 Wire Mode AC24AT AC422AT User s Guide TECHNICAL INFORMATION USING THE AC24AT IN RS 485 2 WIRE MODE These cards are designed for communicating to Optomux brain boards via an RS 422 485 link using 4 wire mode AC422AT can only be used in RS 422 485 4 wire mode It cannot be used in RS 485 2 wire mode A small modification was made to the AC24AT card which provides a possibility of using the card in 5 485 2 wire mode However special software drivers are required to take advantage of this These special software drivers are not provided by Opto 22 For 2 wire RS 485 applications Opto 22 recommends the use of either the AC37 or the AC7A In order to use the AC24AT in RS 485 2 wire mode the following must be done 1 Revised 11 17 98 Write a special software driver to control the enabling
32. he communication cable coming from the TO terminals of the host device or previous Optomux brain board F0 From Optomux This terminology is used with Optomux to identify the receiver terminals that are used to connect the communication cable coming from the TH terminals of the next Optomux brain board FULL DUPLEX A form of communication allowing two devices on the same communication link to transmit at the same time Telephones are a common example of this Most full duplex devices only use two data links e g RS 485 4 wire mode HALF DUPLEX A form of communication allowing only one device on a communication link to transmit at a time Most half duplex devices only use a single data link e g RS 485 2 wire mode IRQ Interrupt Request line MASTER host device used for polling slaves on a Master Slave communication link The master device sends commands to the various slave devices on the network one at a time By controlling communications in this manner multiple slave can reside on the same network without having two devices trying to communicate at the same time REC Receive This abbreviation is used with the adapter card to indicate the receiver terminals Synonymous with RX AC24AT AC422AT User s Guide APPENDIX E RS 422 A communication standard based on the differential voltage between the two wires ina twisted pair Because RS 422 is based on differential voltages it provides a high degree of noise immunity An
33. hen external cable modifications are necessary The RTS output lines must be looped back to the CTS input lines This is done by tying pin 1 to pin 6 and pin 2 to pin 7 This maintains compatibility with older versions and allows software packaging using CTS detection to work correctly AC24AT AC422AT User s Guide APPENDIX C AC24AT AC422AT User s Guide APPENDIX D RS 422 AND RS 485 AS USED WITH OPTO 22 PRODUCTS GENERAL For this discussion data link will refer to a single twisted pair of two wires for carrying data Communications link will refer to the communications cable containing one or more data links as well as an overall cable shield and an additional single wire to be used for the communications signal common See Recommended RS 422 485 Communications Cables for more information about cables to use RS 422 and RS 485 communication links use one twisted pair of two wires for each data link The data signal is transmitted as the difference in voltage differential between the two wires in the twisted pair that makes up the data link The data link carries a digital on or off signal depending on which of the two wires has the higher voltage RS 422 An RS 422 data link a single twisted pair of two wires can only have one transmitter although it can have multiple receivers Because of this each RS 422 data link only allows data to flow in one direction from the single transmitter to the receiver s Therefore
34. ide TROUBLESHOOTING AND TESTING m TROUBLESHOOTING OPTOMUX COMMUNICATIONS USING LED INDICATORS It may be necessary to use a slow baud rate in order to make the LEDs blink slowly making the LED activity easier to see 10 When transmitting did the XMT TX LED on the adapter card blink If it did then the adapter card transmitted a message go to the next step If the LED did not blink then there is probably a mismatch between the operating system and the adapter card with regards to the adapter card s COM port address Make sure the COM port setup in the operating system matches the adapter card s 1 0 port address jumpers Did the REC RX LED on the Optomux brain board blink If it did then the brain board received message go to the next step If the LED did not blink then there is either a power problem at that brain board or there is a communications wiring problem Ensure the voltage at the brain board is 5 0 VDC 0 1 VDC Double check the communications wiring Refer to the Optomux wiring diagrams in Chapter 2 Did the XMT TX LED on the Optomux brain board blink If it did the brain board understood the message and confirmed the message address matched the brain board address and it transmitted a response go to the next step If the LED did not blink then the brain board did not understand the message or the message address did not match the brain board address Verify the operating system COM port settings and softw
35. ion accessory program that is part of both Microsoft Windows 95 and Microsoft Windows NT operating systems It can be started by selecting Start Programs Accessories Hyper Terminal Hypertrm exe If HyperTerminal is not installed on this computer it can be installed from the operating system CD Select the Microsoft Windows 95 or Microsoft Windows NT Start button Settings and Control Panel Double click the Add Remove Programs icon then select the Windows Setup tab HyperTerminal is an option under the Communications group B HyperTerminal Session Configuration Note When using HyperTerminal for the first time if prompted to set up a modem ignore the modem setup prompt and continue 1 2 AC24AT AC422AT User s Guide Under New connection name the connection then choose OK Under Phone number go to the last pull down menu Connect using and choose the appropriate Direct to COM entry Then choose OK Select the appropriate baud rate to match the Optomux Brain Board baud rate jumper settings Set the flow control option to None The other default parameters are correct 8 data bits 1 stop bit and None for parity Then select OK Now there is a connection and terminal screen is blank Select Properties from the File menu Select the settings tab Click on the ASCII Setup button Check the following boxes Echo typed characters locally Append line ends to incoming line feeds Send line ends with line feeds Leave the
36. isions may not be available on the devices It may be necessary to install 220 ohm terminating resistors at but external to the device SUMMARY OF TERMINATION RS 422 and RS 485 data links must be terminated at both ends by having terminating resistors placed across the pair of wires that make up the data link AC24AT AC422AT User s Guide APPENDIX E GLOSSARY OF TERMS AND ABBREVIATIONS COMMUNICATION CABLE The cable which contains all of the necessary wires for the communication link This includes one twisted pair of two wires for each data link as well as and additional single wire typically from an additional twisted pair The cable should also be shielded COMMUNICATION LINK The overall communication network containing one or more data links CTS Clear To Send An RS 232 input signal indicating that it is OK to transmit data to another device DATA The terminal of the data pair of wires For RS 485 the same connection is typically used for TX and RX so it is labeled TX RX or simply Data For RS 422 this could be TX or RX DATA The terminal of the data pair of wires For RS 485 the same connection is typically used for TX and RX so it is labeled TX RX or simply Data For RS 422 this could be TX or RX DATA LINK A single twisted pair of two wires for carrying data FH From Host This terminology is used with Optomux to identify the receiver terminals that are used to connect t
37. k and one for the RS 485 Data Link plus a separate wire for the signal common typically from a third or fourth pair plus an overall cable shield AC24AT AC422AT User s Guide APPENDIX D R BIASING When transmitting data binary one s and zero5 the transmitter is enabled and will be driving the data link high and low to match the binary data bits being sent If the transmitter is left enabled when done transmitting then it will leave the data link in either a high or low state However if the transmitter is disabled when not transmitting it is effectively disconnected from the data link Therefore the disabled transmitter will not be driving the data link high or low The data link will be left floating from an electrical perspective When all transmitters on the data link are disabled the data link is left floating This is the normal condition with RS 485 data links when none of the transmitters are transmitting The state of the data link will be unknown and noise can cause the data link to float to high or low states which can incorrectly appear as valid data to the receivers on the data link To prevent this the data line must be passively pulled to a pre defined state when all transmitters are disabled This is done by tying the Data line to 5 VDC through a 470 ohm pull up biasing resistor and tying the Data line to DC common through a 470 ohm pull down biasing resistor Therefore biasing resistors must be used o
38. l blink on the adapter card indicating it transmitted a message The REC RX LED will blink on the brain board indicating it received a message The XMT TX LED will blink on the brain board indicating the brain board transmitted a response The brain board will only transmit a response if it understood the message and the message address matched the brain board address This implies the settings for all the communication parameters address baud rate data bits stop bits and parity are correct and that the message format was correct The REC RX LED on the adapter card will blink indicating it received the response 1 Usethe Optomux Powerup Clear command the capital letter A to communicate with the Optomux brain boards The command format is gt A followed by a carriage return the Enter key where is the brain board address in hexadecimal hex notation and the is used as a wild card replacement for the message checksum The quotation marks around the message are there for clarification and are not part of the message For example if a brain board is set for address 12 decimal then it s address will be 0 in hex To send the Powerup Clear command to the brain board at address 12 0C hex the message would be gt 0CA followed by the Enter key See the B1 and B2 Digital and Analog Brain Board Operations Manual Form 203 for more details on the Optomux protocol and command set AC24AT AC422AT User s
39. mpers for Controlling the Transmitter on the Adapter Card Jumpers B7 and C7 affect the control of the transmitter on the adapter card Jumpers B7 and C7 must never be installed at the same time When jumpers B7 and C7 are both removed then the AC24AT s transmitter is always enabled This is the default configuration for use with Optomux brain boards using RS 422 485 in 4 wire mode This is allowable because the transmitter on the adapter card will be the only transmitter on that link When jumper B7 is installed the enabling of the AC24AT s transmitter is under the control of the RTS output of the UART The RTS output of the UART is normally controlled by a software device driver or sometimes directly by an application program When RTS is active the transmitter will be enabled When RTS is inactive the transmitter will be disabled tri stated Note If jumper B7 is installed then jumpers B1 and B3 should also be installed in order to provide biasing for the transmit pair of wires When jumper C7 is installed the enabling of the AC24AT s transmitter is controlled by an electrical signal on the RS 422 485 cable which enters the CTS input of the adapter card When CTS is active the transmitter will be enabled When CTS is inactive the transmitter will be disabled tri stated Other Jumpers CTS DISABLE jumper The CTS DISABLE jumper disables CTS functionality on the UART The CTS DISABLE jumper should always be installed when the RTS CTS
40. munications Link Block Diagram of RS 485 DATA Link 2 Wire Mode RS 422 485 P Block Diagram of RS 422 485 Communications Link used by Classic Optomux B1 amp B2 in Multi drop zl MT Summary of Biasing e Er Summary of Termination dpt pes n pelis DEUS Appendix E Glossary of Terms and Abbreviations Appendix F Product Support AC24AT AC422AT User s Guide 33 33 33 33 35 35 37 37 39 39 39 39 40 40 41 41 41 42 43 43 44 44 45 47 CHAPTER 1 INTRODUCTION PRODUCT DESCRIPTION The AC24AT and AC422AT cards provide an asynchronous RS 422 485 communications port for the ISA bus The adapter cards are seen by the computer as standard COM ports These cards are transient protected feature bi directional handshake lines for RTS and CTS and can drive up to 32 devices on a multi drop network They are designed for communicating to Optomux brain boards in RS 422 485 4 wire mode and support baud rates up to 115 2 kbaud In addition the AC24AT card provides 4 000 volts of isolation between the ISA bus and the communications link The AC24AT card can also be set up for RS 485 2 wire mode however special software drivers are requi
41. n RS 422 or RS 485 data link that will have all transmitters disabled when not transmitting Biasing can be done at any location on the data link However biasing should be done at one and only one location on the link For consistency and convenience biasing is normally done at the host device on the data link The adapter card has biasing resistors built in for this purpose They are added or removed by installing or removing the appropriate biasing jumpers See the section titled Biasing Jumpers for more information Summary of Biasing RS 485 data links must be biased at one location only RS 422 data links typically do not require biasing However biasing at one location only will not be detrimental When in doubt as to whether or not biasing is required make sure the data link is biased If biasing is already accomplished at a location on the data link other than the adapter card then the biasing jumpers should be removed from the adapter card AC24AT AC422AT User s Guide APPENDIX D TERMINATION Both ends of each RS 422 and RS 485 data link must be terminated with appropriate terminating resistors Opto 22 products typically have 220 ohm terminating resistors built in To add or remove terminating resistors to the data link set the terminating jumpers appropriately See the section titled Terminating Jumpers When communicating via RS 422 or RS 485 to other non Opto 22 devices termination prov
42. not a DOS box type lt path gt MSD and press the Enter key where lt path gt is the path to the Windows directory that contains the file MSD EXE Select the IRO button and the COM Ports button AC24AT AC422AT User s Guide ADAPTER CARD INSTALLATION Note These tools are a good start but they are not foolproof 1 0 port addresses and IRQ settings that are listed as being used may or may not be available The tools for Microsoft Windows 95 and NT typically only reflect hardware that has been registered in the Registry Other hardware that has not been registered will not be reflected and may cause conflicts Select an 1 0 port address and IRQ that are available in the computer The next section shows how to set jumpers to configure the adapter card 1 0 port address and IRQ B SETTING JUMPERS FOR I O PORT ADDRESS AND IRO Select an available 1 0 port address and an available IRQ setting Use the following tables to identify settings for COM ports 1 0 port addresses and IRQs Table 2 1 Standard COM port names and corresponding 1 0 port addresses and IRQs COM Port Port Name Address 1 8 COM2 2F8 COMS 8 COM4 2E8 OPTO COM3 348 OPTO COM4 340 e port in the operating system is simply a name that defines a combination of an 1 0 port address and an IRQ Whenever that COM port name is referenced the corresponding 1 0 port address and IRQ are accessed e and 2 are standard
43. of the AC24AT s transmitter The transmitter must be disabled tri stated when not actively transmitting to allow other devices on the link to be able to transmit Otherwise the communication link will be tied to the inactive state of the AC24AT s transmitter either high or low In order to do this the driver must control the RTS output of the UART When RTS is active the transmitter will be enabled When RTS is inactive the transmitter will be disabled tri stated Do not proceed to Step 2 until Step 1 is complete At the DB 9 wiring connector externally connect pin 4 to pin 8 and pin 5 to pin 9 This ties the transmitter and receiver together Install the jumper labeled 2 W When this jumper is installed the RS 485 receiver is disabled when the RS 485 transmitter is enabled This is done to prevent the receiver from receiving while the transmitter is transmitting i e to prevent echo Install jumper B7 and remove jumper C7 This causes the enabling of the RS 485 transmitter to be under the control of the RTS output of the UART The RTS output of the UART is controlled by a software driver see item 1 above Install Group B jumpers 1 2 and 3 Remove jumpers 4 5 and 6 This will cause the RS 485 communication link to be properly terminated and biased at the adapter card Install Group C jumpers 2 4 5 and 6 Remove jumpers 1 and 3 This properly terminates the RS 485 RTS pair and properly terminates and biases the CTS pai
44. on both the adapter card and the brain board In addition verify that twisted pair communication cable is being used and that a separate wire is being used for the signal common and that the signal common wire is not connected to earth ground Refer to Chapter 2 as well as the documentation for the brain boards AC24AT AC422AT User s Guide APPENDIX A ADDRESS JUMPERS GROUP A JUMPERS Discussion The adapter card has seven group A jumpers labeled through 9 These jumpers are used for selecting the base 1 0 port address of the adapter card The ISA bus uses 10 address lines A0 through A9 for addressing adapter cards The UART chip on the adapter card uses the lower three address lines A0 through A2 directly This leaves 7 address lines A3 through A9 for decoding the base 1 0 port address of the adapter card The adapter card compares the address lines A3 through A9 on the bus with the address jumpers through Ag on the adapter card When the address lines match the jumper lines the adapter card is selected The adapter card occupies a range of 8 addresses starting with the base 1 0 port address set with the group A jumpers For example if the adapter card is set for a base 1 0 port address of 3F8 hex then it will occupy the range of 3F8 Procedure The adapter card can be set for a particular base 1 0 port address as follows 1 Write the desired base 1 0 port address as a three digit hexadecimal
45. other boxes in their default settings Select OK and select OK again Select Save As from the File menu and save this configuration of HyperTerminal for future use TROUBLESHOOTING AND TESTING C Transmitting Characters to the Optomux Brain Boards Characters will be transmitted out the adapter card port as keys are typed on the keyboard As each key is typed the XMT TX LED on the adapter card should blink and the REC RX LEDs should blink on all Optomux brain boards connected to the communications link Type keys on the keyboard If the LED activity is correct as described above then go to Step D If the XMT TX LED on the adapter card does not blink when keys are typed then there is probably a mismatch between the operating system and the adapter card with regards to the adapter card s COM port address Make sure the COM port setup in the operating system matches the adapter card s 0 port address jumpers See Chapter 2 If the REC RX LEDs do not blink on the Optomux brain boards then there is either a power problem at that brain board or there is a communications wiring problem Ensure the voltage at the brain board is 5 0 VDC 0 1 VDC Double check the communications wiring Refer to the Optomux wiring diagrams in Chapter 2 D Transmitting Optomux Protocol Messages to the Optomux Brain Boards When a valid message is sent to an Optomux brain board the following LED activity will occur The XMT TX LED wil
46. r This will ensure the RTS and CTS LEDs do not erroneously turn on Note Because of item 1 above it is much easier to use either the AC37 or the AC7A B for RS 485 2 wire communication AC24AT AC422AT User s Guide TECHNICAL INFORMATION 9PIN D SHELL CONNECTOR OPTOMUX DESIGNATION ARI LOGIC GND COM or LOGIC GND FO FO TO TXRX TO TXIRX SHIELD DRAIN WIRE EARTH GROUNDED AT ONE END ONLY NOTE Termination resistors 220 ohms may need to be added at but external to the last device on the communication link Check with the manufacturer of the device to determine whether the device has termination resistors internally Figure 4 2 Connecting the AC24AT to a 2 wire RS 485 device AC24AT AC422AT User s Guide CHAPTER 5 TROUBLESHOOTING AND TESTING The adapter card is a simple COM port with RS 422 485 interface Troubleshooting communication problems with the adapter card is simple as long as an organized methodical approach is used COMMUNICATIONS CABLING Each communications link requires an additional single wire to be used as the signal common Many people assume that since RS 422 and 5 485 are based on the differential voltage between the two wires that make up the twisted pair in the data link then the signal common should be optional However it is not Also the signal common should never be tied to earth ground TROUBLESHOOTING THE ADAPTER CARD WITH A LOOP BACK CON
47. red to take advantage of this These special software drivers are not provided by Opto 22 For 2 wire RS 485 solutions use Opto 22 s AC37 ISA bus adapter or AC7A stand alone 5 232 to RS 422 485 converter In this manual differences between the AC24AT and AC422AT adapter cards will be noted where these differences apply Unless a feature is only applicable to one specific model the manual will use the convention adapter card when referring to both models When referring to a specific model the actual model number will be used AC24AT AC422AT User s Guide INTRODUCTION SUMMARY OF FEATURES e The adapter card uses the standard 16550 UART and appears as a standard COM port to the computer e Transient protection for RS 422 485 lines Multi drop capability e RS 422 485 balanced line drivers e Up to 5 000 feet of cable length using shielded twisted pair cable Note 1 e Data rates from 300 baud to 115 2 kbaud Note 2 e Bi directional handshake lines RTS CTS e ED indicators for Transmit Receive RTS and CTS e Jumperconfigurable termination and biasing for RS 422 485 lines e Model AC24AT provides 4 000 volts of optical isolation between the computer and the RS 422 485 lines e Model AC24AT provides transformer isolation between the computer s 5 VDC and the RS 422 485 lines Notes 1 At 38 4 kbaud the distance limit is 5 000 feet At 115 2 kbaud the distance limit is 3 000 feet 2 Classic Optomux brain boards
48. riginal manufacturer applies These products include but are not limited to the OptoTerminal G70 OptoTerminal G75 and Sony Ericsson GT 48 see the product data sheet for specific warranty information Refer to Opto 22 form number 1042 for complete warranty information Opto 22 FactoryFloor Cyrano Optomux and Pamux are registered trademarks of Opto 22 Generation 4 ioControl ioDisplay ioManager ioProject ioUtilities mistic Nvio Nvio net Web Portal OptoConnect OptoControl OptoDisplay OptoENETSniff OptoOPCServer OptoScript OptoServer OptoTerminal OptoUtilities SNAP Ethernet 1 0 SNAP 1 0 SNAP OEM 1 0 SNAP Simple 1 0 SNAP Ultimate 1 0 and SNAP Wireless LAN 1 0 are trademarks of Opto 22 ActiveX JScript Microsoft MS DOS VBScript Visual Basic Visual C and Windows are either registered trademarks or trademarks of Microsoft Corporation in the United States and other countries Linux is a registered trademark of Linus Torvalds Unicenter is a registered trademark of Computer Associates International Inc ARCNET is a registered trademark of Datapoint Corporation Modbus is a registered trademark of Schneider Electric Wiegand is a registered trademark of Sensor Engineering Corporation Nokia Nokia M2M Platform Nokia M2M Gateway Software and Nokia 31 GSM Connectivity Terminal are trademarks or registered trademarks of Nokia Corporation Sony is a trademark of Sony Corporation Ericsson is a trademark of Telefonaktiebolaget LM Eri
49. rminal of the Optomux unit Finally the overall cable shield drain wire should be tied to earth ground at only one of its two ends SHIELDS ARE CONNECTED TO EARTH GROUND AT ONE LOCATION ONLY STANDARD CONFIGURATION OVERALL CABLE SHIELD OPTOMUX B1 or B2 OPTOMUX B1 or B2 3 COM AC24AT 22 2 ADAPTER aros 9 FO EARTH GROUND NOTE IN THIS EXAMPLE THE CABLE SHIELD IS CONNECTED TO THE RS 485 COM COMMON TERMINALS BUT THE SHIELD IS NOT EARTH SHIELD DRAIN WIRE GROUNDED REPEAT MODE IN ORDER TO MEET PUBLISHED SPECIFICATIONS THE MIDDLE OF LINK END OF LINK RS 485 SERIAL LINK REQUIRES TWO TERMINATIONS ONE AT EACH END OF THE SERIAL LINK STAR 9800 d 808 n T CONFIGURATION IS NOT ALLOWED IN ORDER TO USE 012334557 23456878 80 STAR CONFIGURATION USE OPTO 22 PART S GROUPA JUMPERS 0 e GROUP A JUMPERS 0 10 NUMBER AC30A B B2 COMMUNICATIONS WIRING CONNECTIONS ARE MADE TO THE RACK NOT TO THE BRAIN BOARD ON NCN TERMINATED THE RACK THE COM CONNECTOR IS AT THE OTHER END OF THE CONNECTOR STRIP 90808 8866 DO NOT CONNECT ANY COM POINT TO EARTH GROUND 2345 6 789 GROUP A JUMPERS 0 dw GROUP AJUNPERS O TO OPTOMUX FO FROM OPTOMUX TH TO HOST FH FROM HOST JUMPER INSTALLED 8 2 JUMPER REMCVED Figure 2 3 RS 422 485 Wiring from Adapter Card
50. s for DOS and all Microsoft Windows operating systems e COM3 and are standards for all Microsoft Windows operating systems COM3 are Opto 22 standards that were definded prior to the release of the Microft Windows operating systems e Although there are a few standard COM port settings a COM port can be configured for any available 1 0 port address and IRQ For example it is conceivable to set up the adapter card as in the operating system with an 1 0 port address of 340 and IRQ 6 This assumes that 1 0 port address 340 and IRQ 6 are not already in use on the computer and that COM3 did not already exist on the computer This is an acceptable although non standard setup for COM3 AC24AT AC422AT User s Guide ADAPTER CARD INSTALLATION il Table 2 2 Adapter card 1 0 Port Address Jumpers group A jumpers for Standard COM ports A Jumpers COM Port Port Name Address 9 COM1 3F8 COM2 2F8 COM3 3E8 COM4 2E8 348 OPTO COM4 340 Notes 1 Only install the address jumpers listed Remove unlisted address jumpers 2 See Appendix A for additional 1 0 port addresses and jumper settings Table 2 3 Adapter card IRO Jumpers AC24AT wm ep emm e Name Jumper Group ow e ome Notes 1 Only install one IRQ jumper AC422AT wm seus Name Jumper Group ome es In
51. ted pairs as part of a communication cable This is an example of full duplex communications RTS Request To Send This is an RS 232 signal and is an output indicating the device would like permission to transmit RX Receive Synonymous with REC SLAVE A device ona Master Slave communication network that only responds to requests from the master or host device Slave devices are not allowed to initiate communications TH To Host This terminology is used with Optomux to identify the transmitter terminals that are used to connect the communication cable going to the FO terminals of the host device or previous Optomux brain board TO To Optomux This terminology is used with Optomux to identify the transmitter terminals that are used to connect the communication cable going to the FH terminals of the next Optomux brain board TX Transmit Synonymous with XMT XMT Transmit This abbreviation is used with the adapter card to indicate the transmitter terminals Synonymous with TX AC24AT AC422AT User s Guide PRODUCT SUPPORT If you have any questions about this product contact Opto 22 Product Support Monday through Friday 8 a m to 5 p m Pacific Time Phone 800 TEK OPTO 835 6786 951 695 3080 Fax 951 695 3017 E mail support opto22 com Opto 22 Web site http www opto22 com When calling for technical support be prepared to provide the following information about your system to
52. to Classic Optomux Brain Board B1 or B2 AC24AT AC422AT User s Guide ADAPTER CARD INSTALLATION Ma Alternate Configuration This Alternate Configuration uses a cable with only two twisted pairs and an overall shield and is acceptable in most cases However it provides less noise immunity because the shield is not used as a shield it is used as a convenient extra wire for the logic common for the network The first pair of twisted wire connects the TO and TO terminals on the adapter card to the FH and FH terminals on the Optomux unit TO to FH and TO to FH The second pair of twisted wire connects the FO and FO terminals on the adapter card to the TH and TH terminals on the Optomux unit The overall cable shield drain wire connects the LOGIC GND terminal on the adapter card to the COM termi AC24AT OR AC422AT ADAPTER GROUNDED OVERALL CABLE SHIELD NOTE IN THIS EXAMPLE THE 0 CONNECTED TO THE RS 485 COM COMMON TERMINALS BUT THE SHIELD I nal of the Optomux unit ALTERNATE CONFIGURATION ABLE SHIELD IS NOT EARTH IN ORDER TO MEET PUBLISHED SPECIFICATIONS THE RS 485 SERIAL LINK REQUIRES TWO TERMINATIONS ONE AT EACH CONFIGURATI END OF THE SERIAL LINK STAR ON IS NOT ALLOWED IN ORDER TO USE A STAR CONFIGURATION USE OPTO 22 PART NUMBER AC3 B2 COMMUN MADE TO TH CATIONS WIRING CONNECTIONS ARE E RACK NOT TO THE BRAIN BOARD ON THE RACK THE C

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