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1. Step 1 Build the communication cable Things to Consider There are several considerations that help determine the type of cable needed for your DCU application 1 Will the DCU be physically connected in a point to point configuration or multi drop configuration 2 What electrical specification is best for your application RS232C or RS422 What is the cable schematic What are the relevant cable specifications What installation guidelines are necessary Do you just need a quick test cable HS M E H The next few pages discuss these considerations in detail If you already know the type of cable that is needed the cable schematics are included on pages 8 and 9 Consideration 1 Physical Configuration Depending on the version of DCU you have you can use the DCU in either a point to point or multi drop configuration A point to point connection only has two stations a master and a slave Use the point to point configuration to connect a personal computer an operator interface or an intelligent device to a single DCU You should also use this configuration when you want to connect a DirectNET master station to a single DirectNET slave station Use the multi drop configuration to connect one master to two or more slaves Point to Point DL305 with DCU Consideration 2 Electrical Specification RS232C or RS422 000000000000 O0000000000002. There is a specific model of DCU for both RS232C and RS422 communication Your application and configuration choice will help determine which electrical specification is best for you If you are using multi drop you should use RS422 You can use RS232C RS422 converters if necessary If you are using point to point you may have a choice between RS232C and RS422 You can use RS232C if the cable length is less than 50 feet and ifthe cable will not be subjected to induced electrical noise that is commonly found near welders large motors or other devices that create large magnetic fields You should use RS422 for all other applications RS422 allows longer cable distances up to 3300 feet and provides higher noise immunity DirectNET Masters Multi drop DirectNET Slaves The following diagram shows the port pinouts for the two types of DCUs D3 232 DCU Port Pinouts Pin Signal Definition Pin Signal Definition 1 Not connected 14 Not connected 2 RS232C TXD 15 Not connected 3 RS232C RXD 16 Not connected 4 RS232C RTS 17 Not connected 5 RS232C CTS 18 Not connected 6 Not connected 19 Not connected 7 Logic ground Ov 20 Not connected 8 Not connected 21 Not connected 9 Not connected 22 Not connecte
3. Multi drop PC to DL305DCU and DL405PLC Slaves RS422 A B C DL305 D DL305 E DL405 DCU DCU CPU Port Master FA UNICON Convertor Slave Slave Slave 2 TXD 3 RXD 7 GND 7 GND 7 GND 7 GND 3 RXD 2 TXD 10 RTS 10 RTS 10 RTS 19 RTS 5 GND 7 GND 11 RTS 11 RTS 11 RTS 18 RTS 1 DCD 20 DTR 12 CTS 12 CTS 12 4CTS 11 CTS E 13 CTS 13 CTS 13 CTS 23 CTS 14 OUT 17 JN 17 IN 9 N 15 OUT 16 IN 16 IN 10 IN 16 IN 15 OUT 15 OUT L 16 OUT 17 JN 14 OUT 14 OUT 14 OUT 25 IN 25 IN 24 IN 24 IN 23 OUT 23 OUT Termination Resistor Termination Resistor DL305 DL305 DL405 p ee p C D E CPU Port RS422 Multi drop requires termination resistors see installation Consideration 4 Cable Specifications Consideration 5 Installation Guidelines Although many types of cables may work for your application we recommend you use a cable that is constructed to offer a high degree of noise immunity A cable constructed equivalent to Belden 9855 should be sufficient The following specifications should be used as a guideline Structure nse Shielded twisted pair RS232C only uses two wires and a grou
4. eee Personal Computer to DCU RS232C a B Beth Master Slave 2 TXD 2 TXD DL305 DCU S S 1 DCD 4 RTS 4 DTR 5 CTS Z 2 6 DSR 4 7 RTS C A B Q n B 9 pin ZS aoa Connector lt PC DL305 A B pou Master Slave S s 3 RXD 2 TXD 2 TXD 3 RXD 7 GND 7 GND 4 RTS 4 RTS 5 CTS 5 CTS 6 DCD 8 DTR 20 DSR Laa _ 25 pin Connector DL405 DCM to DCU RS422 DL405 DL305 A DCM B peu Master Slave DL305 DCU mie 10 RTS 10 RTS 11 RTS 11 RTS gt p 12 CTS 12 CTS 4 13 CTS 13 CTS A B 14 OUT 17 IN Q ea ers r T a 17 IN 14 OUT a Re DL405 DCM Multi drop DL405 DCM to DL305DCU and A DL405 R 21305 DL305 p DL405 DL405PLC Slaves RS422 DCM DCU DCU CPU Port Master Slave Slave Slave 7 GND 7 GND 7 GND 7 GND 10 RTS 10 RTS 10 RTS 19 RTS 11 RTS 11 RTS 11 RTS 18 RTS 12 CTS 12 CTS 12 CTS 11 CTS 13 CTS 13 CTS 13 CTS 23 CTS 14 OUT 17 IN 17 IN 9 IN 15 OUT 16 IN 16 IN 10 IN 16 IN 15 OUT 15 OUT K 16 OUT 17 IN 14 OUT 14 OUT 14 OUT 22 OUT 25 IN 25 IN 23 OUT 24 IN 24 IN EL 24 IN 23 OUT 23 OUT 25 N 22 OUT 22 OUT Re ee Termination Resistors DL305 DL305 DL405 B E D DCU DCU PU Port
5. is not shielded and is highly susceptible to electrical noise Electrical noise can cause unpredictable operation that may result in a risk of personal injury or damage to equipment Use the cable specifications described earlier in this manual to select a cable suitable for actual applications Build A Test Cable In 30 Seconds 1 Attach Universal Cable Adapter to the DCU 2 Attach another Universal Cable Adapter to the Device which will connect to the DCU 3 Attach the Universal Cable Universal 9 pin D sub connector Universal 25 pin D sub connector Step 2 Set the DCU switches The device s connected to the DCU will help you determine the appropriate switch settings Host Computer or If you re connecting the DCU to a computer or operator interface just set the DCU to Operator Interface match those communication parameters Check the documentation that came with Connection your computer or operator interface to determine the available communication parameters You ll need to know the following things e Baud rate e Parity settings e Protocol NOTE Some operator interfaces support multiple protocols Make sure your operator interface uses one of the following protocols e DirectNET DL330 DL340 D3 232 DCU or D3 422 DCU e Hostlink TI or Simatic T1325 330 335 305 03DM or 305 02DM DirectNET Interface The DCU can only be us
6. on your application requirements Step 4 Verify that it s working correctly On when PLC is in Run Mode On when PLC battery needs replacing On when a fatel error has occured in the CPU gt RuN vata O Check the DCU indicators to verify the DCU is operating correctly The following diagram shows the proper indicator conditions On flashing when data is being transmitted ue BATTC DIAG O ye pwr O Rl O On when internal diagnostic tests are complete and have passed On when base power is on If an external power supply is used both base power and the external supply must be provided for this indicator to be on Troubleshooting If the DCU does not seem to be working correctly check the following items 1 Cable and connections Incorrectly wired cables and loose connectors cause the majority of problems Verify you ve selected the proper cable configuration and check to see the cable is wired correctly 2 Dipswitch settings Make sure you ve set the DCU to match the communication parameters required by
7. the master station DL405 DCM operator interface or host computer 3 Incorrect protocol Make sure your operator interface or personal computer software can use the DirectNET Hostlink CCM2 protocol 4 Communications program Check the communications program for errors Consult the DirectNET Manual or the manuals that came with your host computer software or operator interface for details The following table provides additional troubleshooting details PWR off PLC power is disconnected Check the PLC source power DCU is not connected to the CPU Make sure the DCU is securely properly fastened to the CPU and no connector pins are bent DCU external power source Check the external power source if used is not connected DCU is defective Replace the DCU DIAG off DCU is defective Replace the DCU DATA does not flash during Loose or incorrectly wired cable Check the cable connections and communications Online Offline switch is in the pinouts Offline position Set the switch to Online Communications program is not correct Check the master communications program Verify the address amount of data and data type are correct Specifications Environmental Operating Temperature 32 to 140 F 0 to 60 C Specifications Storage Temperature 4 to 158 F 20 to 70 C Operating Humidity 5 to 95 non condensing Air Composition torse No corrosi
8. 19 RTS g 11 RTS 18 RTS at Master 12 CTS 11 CTS 13 CTS 23 CTS 14 OUT 9 IN 15 OUT 10 IN 16 IN 16 OUT 17 IN 14 OUT ee OUT 120 ohm 23 OUT ET 24 N Resistor 120 ohm T 25 IN eee kag Resistor waar Le TT ee Line to Ground Termination Master Slave Last Slave ain R 7 GND 7 GND 10 RTS 19 RTS 11 RTS 18 RTS 12 CTS 11 CTS 13 CTS 23 CTS 14 OUT 9 N ES 15 OUT 10 IN 4 16 IN 16 OUT 17 IN 14 OUT 22 OUT 62 ohm 23 OUT K 24 IN Resistors SA 25 IN J L LT Le Consideration 6 A Quick Test Cable PLCDirect offers a Universal Cable Kit part number FA CABKIT This cable kit allows you to connect various types of DirectLOGIC products with an RS232C cable in a matter of minutes The kit consists cable phone cable with male plugs already attached and several specially wired connectors The special connectors are a D sub style with built in female phone jacks The kit includes a wide variety of the special connectors so you can use one kit to easily connect products from the different DirectLOGIC family of products To use the kit with the DCU just follow these steps 1 Plug the appropriate D sub connector onto the DCU 2 Plug the appropriate D sub connector onto the other device you are connecting to the DCU 3 Connect the 50 foot cable to the two D sub connectors WARNING This cable is suitable for quick testing situations and should not be used in actual applications This cable
9. ASCII HEX Mode Position 8 on block 1 selects between ASCII and HEX modes of data representation If you want the fastest communication possible use HEX mode The difference is in the way the data is represented The same datais twice as long in ASCII format so if there s more data it takes longer to transfer If you have a device on the network that requires ASCII mode then set the switch for ASCII mode otherwise use HEX mode Online Offline As you examined the diagrams at the Switch beginning of this manual you may have noticed you can still connect a Handheld Programmer even when there is a cable connected to the DCU There s an Online Offline switch on the side of the unit that determines which connection has control of the CPU In the Offline position this switch logically disconnects the DCU from the network just as if you pulled the cable from the 25 pin connector Once this switch is moved to the Offline position the DCU will not communicate with the network and the Handheld Programmer can communicate with the CPU If you move the switch to the Online position the DCU will communicate with the network but not until the master sends a request for communication This does not operate like the reset switch on many personal computers Online Offline External Power Source NOTE You cannot use the Handheld Programmer if the switc
10. DL305 Data Communications Unit Manual Number D3 DCU M WARNING Thank you for purchasing automation equipment from PLCDirect We want your new DirectLOGIC automation equipment to operate safely Anyone who installs or uses this equipment should read this publication and any other relevant publications before installing or operating the equipment To minimize the risk of potential safety problems you should follow all applicable local and national codes that regulate the installation and operation of your equipment These codes vary from area to area and usually change with time Itis your responsibility to determine which codes should be followed and to verify that the equipment installation and operation is in compliance with the latest revision of these codes At a minimum you should follow all applicable sections of the National Fire Code National Electrical Code and the codes of the National Electrical Manufacturer s Association NEMA There may be local regulatory or government offices that can also help determine which codes and standards are necessary for safe installation and operation Equipment damage or serious injury to personnel can result from the failure to follow all applicable codes and standards We do not guarantee the products described in this publication are suitable for your particular application nor do we assume any responsibility for your product design installation or operation If you have any qu
11. ations Consideration 5 Installation Guidelines Consideration 6 A Quick Test Cable Step 2 Set the DCU switches ssssuse Host Computer or Operator Interface Connection DirectNET Interface Connection 420088 go sera grade douane a REN en a a ee DCU SwitCh Settings yadda ale ad Z AE ie aha AMM ne ag dad E aly Mes A N STS E 61 Le a TTT ke leet Address Switch TTT TTT Step 3 Install the DCU and start the communications Check the Power Budget cece cece e ene e tenes lastall the DOULEUR Mt ANS BE a Sala ney tee ae te ee Connect the Cables a 0265 32 sabres Z joeet lan MAS ns Pathe ne re LS To SPSCHICAVONS isiin erii ewe Pie NR KR eae Piet etic Ri eae KR Environmental Specifications Sy an de nt ae add Seiad Sots ee Re RE le sl cee ed Operating Specifications rer sure ve xs eaten es Ko ees Sede Rew ees tees A 19 20 20 20 Manual Revisions If you contact us in reference to this manual be sure to include the revision number Title DL305 Data Communication Unit Manual Number D3 DCU M Original 1 94 Cover Copyright Original Issue Contents Manual Revisions 1 20 Rev A 6 98 Entire Manual Downsize to spiral Manual Revisions Rev A Introduc
12. d 10 Not connected 23 Not connected 11 Not connected 24 Not connected 12 Not connected 25 Not connected ao Not connected D3 422 DCU Port Pinouts Pin Signal Definition Pin Signal Definition 1 Not connected 14 RS422 data out 2 Not connected 15 RS422 data out 3 Not connected 16 RS422 data in 4 Not connected 17 RS422 data in 5 Not connected 18 Not connected 6 Not connected 19 Not connected 7 Logic ground OV 20 Not connected 8 Not connected 21 Not connected 9 Not connected 22 RS422 data out 10 RS422 RTS 23 RS422 data out 11 RS422 RTS 24 RS422data in 12 RS422 CTS 25 RS422 data in 13 RS422 CTS Consideration 3 The following cable schematics are appropriate for most applications You may have Cable Schematics to combine some of these examples to design a cable that meets your exact application requirements DL405 DL305 DL405 DCM to DCU RS232C A DCM B pecu DL305 DCU Master Slave 2 TXD 3 RXD Ores 3 RXD 2 TXD l E qe A B 7 GND 7 GND Q UU D DL405 DCM pe
13. ed as a slave station so set the switches to match the Connection communications parameters for the master station DL405 PLC Master Slave Network a DCM as Master DL305 DCU as Slave Td DCU Switch Settings There are two banks of switches located on the side of the DCU that are used to set the communications and protocol parameters The following diagram shows the locations and setting options Lo JE DCU Side View Block 1 Block 2 ON OFF ASCII Mode 8 HEX Mode Not Used 7 Not used PGM Mode at power up 6 Run Mode at power up 10 ms Delay Time 5 No Delay Self Test 4 Set to OFF ODD Parity 3 NO Parity Switch Positions 2 Baud Rate Baud 1 2 1 300 OFF OFF Bloc in 19200 ON ON Baud Rate The first two positions on block 1 are used to set the baud rate for the DCU There are four baud rate selections available ranging from 300bps to 19 2Kbps All stations must have the same baud rate before the communications will operate correctly Usually you should use the highest baud rate p
14. een PLCs and an intelligent device such as a host computer The DCU easily connects to DirectNET This network allows you to upload or download virtually any type of system data including Timer Counter data I O information and Register memory information As part of a PLC Network Slave The DCU can only be used in a DL305 PLC station that is serving as a network slave station In this case the DCU listens to the network for any messages that contain the DCU s address The DCU deciphers the network commands carries out the request to read or write data and sends confirmation and or information to the master station DirectNET Slaves Slaves respond to DirectNET Masters the master s request E Q s B B D S Response a ta o al Request R HER AWE S How can l connect the DCU Four Simple Steps Complete the following steps to connect the DCU STEP 1 Build the communication cable that fits your needs STEP 2 Set the DCU switches Baud ae rate parity etc STEP 3 Install the DCU Check the LEDs STEP 4 Verify correct operation OF ooo OO O
15. estions concerning the installation or operation of this equipment or if you need additional information please call us at 1 800 633 0405 This publication is based on information that was available at the time it was printed At PLCDirect we constantly strive to improve our products and services so we reserve the right to make changes to the products and or publications at any time without notice and without any obligation This publication may also discuss features that may not be available in certain revisions of the product Trademarks This publication may contain references to products produced and or offered by other companies The product and company names may be trademarked and are the sole property of their respective owners PLCDirect disclaims any proprietary interest in the marks and names of others Stage is a trademark of Koyo Electronics Industries Co LTD Think amp Do Software is a trademark of Think amp Do Software Inc Texas Instruments is a registered trademark of Texas Instruments Inc TI TIWAY Series 305 Series 405 T1305 and T1405 are trademarks of Texas Instruments Inc Siemens and SIMATIC are registered trademarks of Siemens AG GE is a registered trademark of General Electric Corporation Series One is a registered trademark of GE Fanuc Automation North America Inc MODBUS is a registered trademark of Gould Inc IBM is a registered trademark of International Business Machines MS DOS and Microsoft are re
16. gistered trademarks of Microsoft Corporation Windows and Windows NT are trademarks of Microsoft Corporation OPTOMUX and PAMUX are trademarks of OPTO 22 Copyright 1998 PLCDirect Incorporated All Rights Reserved No part of this manual shall be copied reproduced or transmitted in any way without the prior written consent of PLCDirect Incorporated PLCDirect retains the exclusive rights to all information included in this document Table of Contents Introductie iaa Sa ea wk De FRANS eae am aa toire RL Is this the right manual for you 22e ee ee es wk Re ren oe ee DCU Hardware Overview 0 0 ccc eee eee eee eee eee ene e eee Seh RTT tata nna A En eM aS Sako ta lah sl oe ta LAS NE LE a How can I use the DCU sc ieee ee aw hi i oles eg oe ne Le ok As a General Purpose Communication Port AS a DireciNET Intenmace is cco a er anne a ead ds GS Sieh ga Gh da Ne eda RS How can I connect the DCU Four Simple Steps Step 1 Build the communication cable FIG 10 CONSID RE tac ea ak Dealt ae a Way cated eed a tea ala 0 Consideration 1 Physical Configuration Consideration 2 Electrical Specification RS232C or R8422 Consideration 3 Cable Schematics Consideration 4 Cable Specific
17. h is in the Online position m OFF Binary Value Address Switch The DCU station address is set by the second 8 Not used switch block which is located on the side of 7 64 the unit The decimal address is set in BCD 6 32 Binary Coded Decimal format with valid 5 16 addresses from 1 to 90 decimal For example 4 8 to set an address of 10 you should turn on 3 4 switches 4 and 2 2 2 The addresses do not have to be sequential i 1 but each station must have a unique address Block 2 NOTE The DCU address switch settings are only read at power up If youve want to change the address and the DCU is already up and running you ll have to cycle the system power to initialize the change Step 3 Install the DCU and start the communications Check the Power Budget The DCU requires 500 mA of 5V base power Make sure you will not exceed the available base power budget by installing the DCU WARNING Exceeding the base power budget may cause unpredictable system operation that can result in personal injury or equipment damage See the DL305 User Manual for details on power budget calculations On the back of the DCU is a switch to select if it will receive power form the base INT internal position or from an external power source EXT external position If there appears to be a power budget problem use the external power source o
18. line an o Y lone RS232C RS422 O Communication Port pos Block1 000000000000 000000000000 Block2 O External Q r Power Handheld Programmer DIP Switches for communications Connector and Protocol Parameters DCU Uses The DL305 Data Communications Unit DCU is a communications interface for the DL305 family of Programmable Logic Controllers PLCs This module is primarily used for two reasons e As a general purpose communications port to connect a personal computer or operator interface s As a network interface to a DirectNET network The following pages provide an overview of these uses along with the information you need to connect the DCU How can I use the DCU As a General As a communication port you can connect various devices such as operator Purpose interfaces or personal computers Communication Since the DCU does not require any programming you can simply set the DCU Port communication parameters connect the appropriate RS232C or RS422 cables and start programming or transferring data DL305 with DCU T M As a DirectNET The DCU can be used as a network interface for applications that require data to be Interface shared between PLCs or betw
19. nd Conductor size 24 AWG or larger Insulation sachet icedeusvasss Polyethylene Shield vases Copper braid or aluminum foil Impedance nern 1000 1MHz Capacitance nuaa e erenn 60pf meter or less Your company may have guidelines for cable installation If so you should check those before you begin the installation Here are some general things to consider e Don t run cable next to larger motors high current switches or transformers This may cause noise problems e Route the cable through an approved cable housing to minimize the risk of accidental cable damage Check local and national codes to choose the correct method for your application e Consider redundant cabling if the application data is critical This allows you to quickly reconnect all stations while the primary cable is being repaired Cable Shield Grounding It is important to ground the cable shield to minimize the possibility of noise The preferred method is to connect one end preferably the receiver end of the cable shield to the connector housing If noise problems are still present and you have a good earth ground for the cabinet you should connect one end of the shield to the cabinet earth ground Don t ground both ends of the shield because this will create induced noise on the cable Step 1 Strip back about 2 5 of the shield Step 3 Secure the shield to the connector shell ee L as Step 2 Crimp a ri
20. ng connector onto the shield Multi drop Termination Resistors It is important you add termination resistors at each end of the RS422 line This helps reduce data errors during data transmission You should select resistors that match the cable impedance For example atypical 22 AWG solid conductor cable with 4 5 twists per foot has a typical impedance of about 1200 There are two ways to actually connect the resistors Line to Line this method balances the receive data lines IN and IN and requires one resistor at each end of the line The cable diagrams we ve provided show this method but you can use either Line to Ground this method also balances the receive data lines but common mode noise rejection is improved significantly This method requires two resistors at each end of the line Also since there are two resistors the sum total of both resistors should match the cable impedance The following diagram illustrates the two options Terminate at Last Slave Line to Line Termination 62 ohm Resistors Master Slave Last Slave PT a gt 7 GND 7 GND Terminate 10 RTS
21. ossible unless noise problems appear If noise problems appear try reducing the baud rates Parity Position 3 on block 1 selects between the two parity options odd or none If you re using all DirectLOGIC equipment you can use odd parity Odd parity uses eleven bits total 1 start bit 8 data bits 1 stop bit and 1 parity bit Some devices require no parity which uses only 10 bits 1 start bit 8 data bits and 1 stop bit Self Test Position 4 on block 1 selects the factory self test and should always be switched off If the self test is on the DCU will not operate correctly Response Delay Time Position 5 on block 1 sets the response delay time This sets how long the DCU will wait before it responds to each component of a DirectNET communication request If you re using all DirectLOGIC equipment a response delay is not required and you should turn off the switch The DCU may respond too quickly for some devices such as telephone or radio modems If you encounter this problem turn on the delay switch to provide a 10 ms delay If this still does not work check your device manual to see if the device requires more than a 10 ms delay Mode at Power up Position 6 on block 1 allows you to select the CPU operating mode when system power is supplied If the switch is turned on the CPU automatically enters Program mode when power is supplied If the switch is off the CPU automatically enters Run mode when power is supplied
22. ption The DCU is shipped with a three pin pigtail which should be used to connect the external power source The pigtail connects to the bottom outlet on the side of the DCU 0 A o EXT S O t Le DN INT Set Switch 0 to reflect power source L U z NI oon co Green Black White G OV 5V If you use an external power supply you must provide an external ground connection for the DCU The following diagram shows how the external power sources are connected 2 To host or Twisted Pair slave station S J aaa Ee RU EE DFE trea s Le I Re fy 5V E 5V l Power Power RS422 422 Amp or Supply Supply RS422 432 Convertor GND Install the DCU Use the following procedures to install the DCU WARNING Always disconnect the system power before installing or removing any system component Also do not install a DCU while the CPU is in RUN mode This may cause unpredictable operation which can result in a risk of of electrical shock personal injury or equipment damage 1 Set the power sou
23. rce switch located on the rear of the DCU to the correct position 2 Carefully align the connector on the rear of the DCU with the CPU connector and gently push the DCU onto the CPU Ifthe connectors are not aligned properly you can bend the connector pins 3 Secure the DCU to the system with the two mounting screws Connect the Make sure you have all the cables connected and that all the network devices have Cables the same communication parameters baud rate parity etc If you re using an Connect the cables and follow the procedures outlined in the documentation that Operator Interface came with your host computer software or operator interface You ll have to execute or Computer your host or operator interface program before the communications can begin For example if you re using DirectSOFT you can just specify the station address and start working If you re using Since you can only use the DCU in aslave station there has to be a network master DirectNET that issues the communication requests The PLC master station must contain an RLL communications program See the DirectNET Manual or the DL405 User Manual for details on the RX and WX instructions The master station CPU must be in Run mode in order to execute the communications program The slave station CPUs do not absolutely have to be in Run mode because the DCU will still transfer the data Whether you put the slave stations in Run mode depends
24. tion Is this the right This manual is designed to allow you to quickly install your DL305 Data manual for you Communications Unit DCU This is the only manual you will need if your are using the DCU as an interface for the DirectSOFT programming package or as a communications port for an operator interface If you plan on using the DCU as a slave interface on a DirectNET network you should read the DirectNET manual first The DirectNET manual provides detailed descriptions of the network configuration and protocol that is necessary to control communications with the DCUs DCU Hardware The following diagram shows the major DCU components The address selection Overview switches and the communication dipswitches are of special importance Also there are two versions of the DCU RS232C and RS422 You can use RS232C RS422 converters with these units but it is generally easier to use the version that is best suited for your application On flashing when data is emo poemes On when PLC battery T BaTTO piac O On when internal diagnostic tests needs replacing cpu O pwr O ie have complete and passed On when a fatel error On when base power is on If an external has occured in the CPU power supply is used both base power and the external supply must be provided for this indicator to be on Online Offline Switch Oo 0 S On
25. ve gases permitted Vibration irca lisses Mate Sek MIL STD 810C 514 2 SHOCK Hans semer eee tierce MIL STD 810C 516 2 Voltage Isolation 1500 VAC 1 minute duration NOISE ar es arms a re NEMA ICS3 304 Operating Power Budget Requirement 500 ma 5 V Specifications Communication Interface D3 232 DCU Serial RS232C half duplex DTE Asynchronous 8 bits character D3 422 DCU Serial RS422 Half duplex Asynchronous 8 bits character Baud Rales 1 55 SE e tuer 300 to 19 2K baud switch selectable Maximum Distance 3300 feet 1000 meters RS422 50 feet 18 meters RS232C Protocol Se lt ec tel on alan ne DirectNET also compatible with Hostlink CCM2 DiagnoOSti s sue Bets mens s Automatic check of communications switch settings and LEDs
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