Model PCL - 726 Six Channel D/A Output Card
Contents
1. 1 GENERAL INFORMATION 1 1 Description The PCL 726 provides six analog output channels on a single PC BUS add on card Each channel can be set individually to any of the following ranges 0 to SV 0 to 10V 5V 10V and 4 to 20mA current output Designed for rugged environment the PCL 726 is an ideal and economical solution for industrial application requiring multiple analog voltage and or current output channels In addition to the analog output PCL 726 also provides 16 channels of digital output and 16 channels of input The D I and D O ports are TTL compatible and designed to be fully compatible with the available daughter boards those offer convenient solution to industrial ON OFF control and sensing application These daughter boards include PCLD 782 Isolated D I Board PCLD 785 Relay Output Board and PCLD 786 SSR amp Relay Driver Board A utility program disk is supplied with the purpose to minimize user s software effort The disk contains ready to run calibration program demonstration program as well as program examples 1 2 Features 6 independent D A output channels 12 bit resolution double buffered D A converters m Multiple voltage ranges 10V SV 0 to 10V 0 to 5V and 4 to 20 mA current loop sink All D A outputs will be at 0 volt initial state after RESET or POWER ON at either bipolar or unipolar mode m 16 digital input and 16 digital output channels They are all TTL compatible2. Reset power on status All D A channels will be at 0 volt output after reset or power on either bipolar or unipolar mode 1 3 2 Digital Input Channel Level Input low Input high Input load 16 bits TTL compatible 0 8V max 2 0V min 0 4mA max at 0 5V 0 05mA max at 2 7V 1 3 3 Digital Output Channel 16 bits Level TTL compatible Output low 0 5V max when sink 8mA Output high 2 4V min when source 0 05mA 1 3 4 General Specifications Power consumption 5V 500mA typ LA max 12V SOMA typ 110mA max 12V 14mA typ 90mA max I O connector 20 pin post header for Analog Digital I O ports Adapter available to convert to 37 pin D type connector 1 0 base address Requires 16 consecutive address locations Base address definable by the DIP switches for address line A8 A4 Factory setting is hex 2C0 Operating Temp 0 to 50 deg C Storage Temp 20 to 65 deg C Weight 8 6 oz 242 89 gm 2 INSTALLATION 2 1 Initial Inspection Inside the shipping container you should find this operating manual and the PCL 726 card The PCL 726 was carefully inspected both mechanically and electrically before being shipped It should be free of marks and scratches and in perfect working order on receipt When unpacking check the unit for signs of shipping damage damaged box scratches dents etc If there is damage to the unit or it fails to meet specificatio
3. The calibration program is written in BASIC language To use it simply load the program into BASIC and run the program The default I O port address setting in the program is hex 2C0 If address hex 2C0 had been occupied by another device you may either replace that device with the PCL 716 on address hex 2C0 or modify the address setting in the calibration program It is strongly recommended that do not change 25 the program unless you thoroughly understand the PCL 726 calibration program Once the calibration program has been loaded and executed it used the graphic display and prompts to guide you through the calibration process In addition to the calibration program it is necessary to have a 5 1 2 digit multimeter to perform the calibration A slot extension card will make your access to the VR s easier The PC LabCARD product PCL 755A Slot Extension Card is an ideal product to support the slot extension A standard procedure to calibrate the PCL 726 card is illustrated below Step Calibrate REFERENCE VOLTAGE SOURCES including 10V REFI Ch 4 Ch 6 5V REFI Ch 4 Ch 6 10V REF2 Ch 1 Ch 3 and 5V REF2 Ch Al Ch 3 lt VR4 VR7 gt Step2 Adjust D A voltage output OFFSET of unipolar mode lt lt Adjust VR2 of each channel gt gt Step3 Adjust D A voltage output GAIN of unipolar mode lt lt Adjust VR1 of each channel gt gt Step4 Adjust D A precision 4mA constant current lt lt Adjust
4. A 1 2 3 4 5 6 X X X X DA11 DA10 DAI DA8 High byte BASE 1 3577 9711 D7 D6 D5 D4 D3 D2 D1 DO D A 1 2 3 4 5 6 DA7 DA6 DA5 DA4 DA3 DA DAl DAO Low byte LEGEND DA11to DAO Digitalto analog data DAO is the least significant byte LSB and DAZI is the most significant byte MSB of the D A data X Don t care The D A circuit utilizes a double buffer technique to eliminate the transient stage between the writing operations of high byte and low byte data The high byte data only the lower4 bits are significant must be written first and it is then latched into a latch for temporary storage and does not change the analog output While the low byte is being sent the high byte data reaches the D A converter at the same time as the low byte data NOTE THE HIGH BYTE DATA MUST BE SENT FIRST 4 4 Digital I O Registers The PCL 726 offers 16 digital input channels and 16 digital output channels The digital input channels use the I O address BASE 14 and BASE 15 The digital output channels use the I O address BASE 12 and BASE 13 The data format of each port is as following Data Format BASE 12 D7 D6 D5 D4 D3 D2 D DO D O high byte D015 D014 D013 D012 Doll D010 D09 DO8 BASE 13 D7 D6 D5 D4 D3 D2 D DO D O low byte DOT D06 D05 D04 D03 D02 D01 DOO BASE 14 D7 D6 D5 D4 D3 D2 D DO D I high byte DI15 DI14 DI13 DI12 DI11 DI10 DI9 DI8 BASE 15 D7 D6 D5 D4 D3 D2 D DO D 1 low b
5. VR named CHI to CH6 gt gt Step5 Adjust D A voltage output OFFSET of bipolar mode lt lt Adjust VR3 of each channel gt gt Note The voltage output GAIN of bipolar mode depends on the GAIN of unipolar mode so it is not necessary to be adjusted The current gain depends on a precise fixed resistor and does not need adjustment 26
6. cover to the system unit save the screw to secure the interface card retaining bracket 6 Carefully grasp the upper edge of the PCL 726 card Align the hole in the retaining bracket with the hole on top of the expansion slot and align the gold striped edge connector with the expansion slot socket Press the board firmly into the socket 7 Replace the screw in the expansion slot retaining bracket 8 Attach necessary accessories e g 20 pin flat cable or connector adapter to the interface card based on your application requirements 9 Replace the system unit cover Connect the cables you removed in step 2 Turn the computer power on The hardware installation is now completed proceed to install the software driver 2 5 Software Installation A floppy diskette containing utility software is included with each PCL 726 to minimize your application programming work and support the PCL 726 calibration The utility programs include 1 Testing program 2 Demonstration programs 3 Calibration program It is strongly recommended that you make a working copy from the master copy diskette and save the master copy in safe place You may use the DOS COPY or DISKCOPY commands to copy the diskette files to another floppy disk or use the COPY command to copy the files to a hard disk Refer to your MS DOS users manual for details of how to make backup copies of your 11 make backup copies of your diskettes Since the operation of the
7. might have used some of these addresses for other devices Your PCL 726 base address switch setting is set to hex 2C0 in the factory If you need to adjust it to some other address range the switch settings for various base addresses are illustrated as below I O Address Switch Position Range Hex 1 2 3 4 5 A9 A8 A7 A6 A5 A4 Fixed 200 20F 1 0 0 0 0 0 210 21F 1 0 0 0 0 1 220 22F 1 0 0 0 0 0 2C0 2CF x 0 1 1 0 0 300 30F 1 0 0 0 0 3F0 3FF il 1 1 1 1 Note ON 0 OFF 1 A4 A9 correspond to PC bus address lines means factory setting Switch position 6 is not used 2 2 2 Wait State Selection Switch name SWI position 7 and 8 Some high speed PC s may require that wait states are inserted to achieve stable data transfer The PCL 726 can be configured with 0 2 4 or 6 wait state delays fur each transfer of data The length of the wait state can be selected with the positions 7 and 8 on SWI as shown below Switch Position Wait state 7 8 time delay 0 0 0 1 0 2 0 T 4 1 1 6 Note means factory setting 2 2 3 Reference and Mode Selection Jumper name JP1 JP2 of each channel There are two jumpers for D A reference source and output mode selections on each D A conversion channel The JP1 setting selects the reference of 5V 10V or external voltage The JP2 setting selects bipolar or unipolar mode of D A output JP1 setting Unipolar Bipolar Unipolar ES Unip
8. shown below O to SY Unipolar Grounded output Load 14 OT LI r I oa e si Converter gt o o to 5V E mi Ed opone Unipolar Output j sma v pa A GND LV Power U Supply co A an mw m l i OUT AAA DYA PAME Converter i 1 E di uet 0 to SV T I Umipolar j Float Output AMA 3 i Case 1 i A GND So KZ 1 i 1 cera a La i pr END O PC 42V T Supply ms 12V Ot 1 3 Programmable Attennuator Connection A variety of D A operations can be supported by your PCL 726 For example the PCL 726 can function as a digital attenuator by inputing variable AC or DC references or can be used to generate arbitrary waveform outputs The connection is External HC 0 igY M REF source AEF IN D A ro B Converter i NA 15 3 5 Digital Signal Connection The PCL 726 has 16 digital input and 16 digital output channels The digital 1 0 levels are TTL compatible To transmit or receive digital signal to from other TTL devices the connection is TTL Devices I nu I i LAA o o I i DI H 53 co Pa ES o Ot Se D GND D GND pra o L gt To receive an OPEN SHORT signal from a switch or relay a pull up resistor must be added to ensure the high level when open ile to o 16 4 REGISTER STRUCTURE AND FORMAT 4 1 Introduction The PCL 726
9. ALUE INP ADDRESS Where ADDRESS is BASE 14 high byte or BASE 1S low byte A writing operation to any of the D ports will set the desired value of the 8 corresponding digital output channels To access the D O ports in BASIC use the statement shown below OUT ADDRESS VALUE Where ADDRESS is BASE 12 high byte or BASE 13 low byte 21 APPENDIX A BLOCK DIAGRAM fi MI i LO uw NG 250 30 NO NO NC LITM OM PE SAYMIY SY LNO z226 AOT LNO i38 AS AVHOVIO 2018 S22 1 22 APPENDIX B CONNECTOR SWITCH AND VR LOCATIONS SAUA n OUVO LNELND Y C HO XIS 924 294 En BARDO de 1 TMS i t i I al i i 1 pa m I ino v o I NI STO TND F I eno I I i T HD Pese 9 HO m I i i t d i t 3 I i kh i i I xA PU I i i sno vya i Uno sa END i TNO I I f i POY 1naino i 3 POY au INIUUNI i oj rav i NG ze zn ur c 28 ZON Ca nn AG Fa Aot Bibi kakak Hepes el Su S i A HA dA ter EN tar CS ame N 23 APPENDIX C PC I O PORT ADDRESS MAP 1 0 Address Range Hex Function 000 1 FF 200 201 202 277 278 27F 280 2F7 2F8 2FF 300 377 3713 37F 380 3AF 3BO 3BF 3CO 3CF 3DO 3DF 3EO 3EF 3FO 3F7 3F8 3FF Base system Reserved Came control Reserved Second printer port Reserved CO
10. LATION iii e AN 5 2 1 Initial Inspection tomas e e dts 5 2 2 Jumper Settings eee 5 2 2 1 Base Address Selection 5 2 2 2 Wait State Selection 6 2 2 3 Reference and Mode Selection 7 2 3 Connector Pin Assignment 8 2 4 Hardware Installation 10 2 5 Software Installation 11 3 SIGNAL CONNECTION 13 3 1 Introduction v lie e ale Babaha 13 3 2 Voltage Output Connection 13 3 3 4 to 20mA Current Output Connection 14 3 4 Programmable Attennuator Connection 15 3 5 Digital Signal Connection 16 4 REGISTER STRUCTURE AND FORMAT 17 4 1 Introduction prata SRDS ERASE ERE i 17 4 2 I O Port Address Map 17 4 3 D A Output Registers 18 4 4 Digital I O Registers 18 5 APPLICATION pdr te aa a 20 5 1 D A Applications 20 5 2 Digital Input and Output APPENDIX A BLOCK DIAGRAM APPENDIX B CONNECTOR SWITCH AND VR LOCATIONS APPENDIX C PC I O PORT ADDRESS MAP APPENDIX D CALIBRATION eee D 1 VR Assignment D 2 D A Calibration
11. M2 Reserved First printer port Reserved Mono Disp Print adapter Reserved Color Graphics Reserved Floppy disk drive COMI 24 APPENDIX D CALIBRATION In the application of data acquisition and control it is important to constantly calibrate your measurement device to maintain its accuracy A calibration program CALB726 BAS is provided on the PCL 726 software diskette to assist your calibration work D 1 VR Assignment There are 28 variable resistors VR on the PCL 726 to allow you making accurate adjustment on D A channels The location of each VR is indicated in Appendix B Connector Switch and VR Locations There are 6 sets of VRI VR2 and VR3 for the adjustment of 6 D A channels respectively The functions of the VR s are listed below VRI D A gain adjustment for each channel VR2 D A unipolar offset adjustment for each channel VR3 D A bipolar offset adjustment for each channel VRA 10V reference voltage adjustment for D A Ch 4 to Ch 6 VRS 5V reference voltage adjustment for D A Ch 4 to Ch 6 VRE 10V reference voltage adjustment for D A Ch 1 to Ch 3 VR7 5V reference voltage adjustment for D A Ch 1 to Ch 3 CHI Ch 1 current offset adjustment 4 mA CH2 Ch 2 current offset adjustment 4 mA CH3 Ch 3 current offset adjustment 4 mA CHA Ch 4 current offset adjustment 4 mA CH5 Ch 5 current offset adjustment 4 mA CH6 Ch 6 current offset adjustment 4 mA D 2 D A Calibration
12. Model PCL 726 Six Channel D A Output Card PCL 726 SIK CHANNEL D A OUTPUT CARD USER S MANUAL Copyright Notice This documentation and the software routines contained in the PCL 726 software diskette are copyrighted 1989 by Advantech Co Ltd All rights are reserved Advantech Co Ltd reserves the right to make improvements to the products described in this manual at any time without notice No part of this manual may be reproduced copied translated or transmitted in any form or by any means without the prior written permission of Advantech Co Ltd Information provided in this manual is intended to be accurate and reliable However Advantech Co Ltd assumes no responsibility for its use nor for any infringements of rights of third parties which may result from its use Acknowledgement PC LabCard is a trademark of Advantech Co Ltd IBM and PC are trademarks of International Business Machines Corporation MS DOS is a trademark of Microsoft Corporation BASIC is a trademark of Dartmouth College Intel is a trademark of Intel Corporation Part No 2003726000 Rev Al Printed in Taiwan May 1994 Table of Contents 1 GENERAL INFORMATION 1 TA DESCEIptioni eer e ALII 1 EDESA aa 1 13 Specifications mi E EE ERE e 2 1 3 1 Analog Output 1 3 2 Digital Input 1 3 3 Digital Output 4 1 3 4 General Specifications 4 2 INSTAL
13. calibration program will be covered in Appendix D we will only explain the functions of these program files TEST726 EXE The object of the test program is to test the PCL 726 functions easily by the user The test functions consist of D A voltage output D A current loop output digital output and digital input DEM0726A BAS This demonstration program provides an example of writing I O ports to program D A 1 to generate 3V at unipolar mode and than programs D A 2 to generate 3V at bipolar mode Additionally there are also some explanations about how to program a current output of 10mA on D A 3 DEM0726B BAS This demonstration program provides an example that programs D A 1 to D A 6 to generate a voltage waveform rising from 5V to 5V and then a drop from 5V to 5V at bipolar mode CALB726 BAS _ This calibration program provides a procedure to calibrate the voltage and current output of each D A channels The program will guide the user to adjust the variable resistors to get the best accuracy of the outputs 12 3 SIGNAL CONNECTION 3 1 Introduction Correct signal connection is one of the most important steps to assure your application system will send and receive data correctly Since most data acguisition applications involve voltage measurement correct signal connection will avoid costly damage to your eguipment This section provides some useful information on signal connection in different types o
14. f data acguisition applications 3 2 Voltage Output Connection The PCL 726 supports 6 channels of D A voltage output There is only one output signal wire for each channel The voltage is referred to the common ground It is fairly simple to connect a voltage output channel to a floating load A standard wiring diagram is illustrated below PCL 726 Side Ezternal Side D A Y OUT E DT i I A un a For grounded load the signal should be connected as 1 ae Load _A GND D J 13 For some differential input loads an external ground wire is needed and the signal connection is recommended as following I E Se I I Converter ee ali ei a E Load i iS 1 3 3 4 to 20mA Current Output Connection The PCL 726 provides 6 channels of 4 to 20mA current output The current loop output utilizes the 0 to 5V unipolar voltage output as the driving source and a current drive circuit consists of a power FET reverse protection diode and a constant current source The voltage bias of this current output should be within 8 to 36 volts to insure correct operation A 24 volt power supply is ideal for this application The PCL 726 also provides internal 12 volt power source for current loop by user s selection There are three ways of connecting a grounded load with a floating supply a floating load with a grounded power supply a floating load with internal 12 volt supply The connections are
15. ns notify your local sales representative immediately Remove the PCL 726 interface card from its protective packaging by grasping the rear metal panel Keep the anti vibration packing Whenever you remove the card from the PC I O slot please store the card in the package for protection Discharge any static electricity by touching the back of the system unit before you handle this card You should avoid contact with materials that create static electricity such as plastic vinyl and styrofoam The board should be handled only by the edges to avoid static electric discharge which may damage the integrated circuits on the PCL 726 2 2 Jumper Settings The PCL 726 is designed with easy to use in mind There are one DIP switch and seven jumpers on the PCL 726 card and the function of each switch is discussed in this section You may want to refer to Appendix B for the physical location of each switch 2 2 1 Base Address Selection Switch name SWI position 1 to 5 Most PC peripheral devices and interface cards are controlled through the input output I O ports These ports are addressed using the I O port address space Appendix C provides a PC I O port address map to help you locate appropriate addresses for different devices The I O port base address for the PCL 726 is selectable via an 8 position DIP switch The PCL 726 requires 16 consecutive address locations in the I O space Valid addresses are from hex 200 to hex 3F0 however you
16. olar 9 o Bipolar Bipolar JP2 setting External ref 10V ref 5V ref EXT O O EXT o o EXT ED o 10V 10V o o 10V o o 5V o o 5V 5V Some typical combinations of JP1 and JP2 are shown as following Output range JP2 JP1 BE 0 to 5V o o o Unipolar o o o E o 0 to 10V o Unipolar o o o o o o o o 5V o o E o Bipolar o o o o o 10V mo B 2 Bipolar o o o ZA o o o 4 to 20mA o o ol o o_O o o Ext Ref fo 6 o Programmable o o ol Attenuator o o o o Note 1 For programmable attenuator function should the input signal should be connected to the ref in pin of CN3 and CNA 2 means factory setting 2 3 Connector Pin Assignment The PCL 726 is equipped with two 20 pin insulation displacement mass Termination connectors accessible from the rear plate and two other 20 pin insulation displacement connectors on board All these connectors can be connected to the same type of flat cables or connected to 37 pin D type connectors through our PCLK 1050 industrial wiring kit Please Refer to Appendix B for the location of each connector The following diagrams illustrate the pin assignment of each connector Legend VOUT IOUT REF OUT REF IN D O D I D GND A GND NC Connector 1 CN1 D O 0 D O 2 D O 4 D O 6 D O 8 D O 10 D O 12 D O 14 D GND 5V Connector 2 CN2 D I 0 D I 2 D I 4 D I 6 D I 8 D I 10 D I 12 D I 14 D GND 5V Analog voltage out
17. put Analog current output Reference voltage output Voltage reference input Digital output Digital input Digital and power supply ground Analog ground No connection Digital Output D O 1 D O 3 D O 5 D O 7 D O 9 D O 11 D O 13 D O 15 D GND 12V Digital Input D I 1 D I 3 D I 5 D I 7 D I 9 D I 11 D I 13 D I 15 D GND 12V Connector 3 CN3 D A Output 5V REF OUT 5V REF OUT D A 1 V OUT D A 1 REF IN D A 2 V OUT D A 2 REF IN D A 3 V OUT D A 3 REF IN A GND NC Connector 4 CN4 D A Output D A 4 V OUT D A 4 REF IN D A 5 V OUT D A 5 REF IN D A 6 V OUT D A 6 REF A GND D GND 5V 12V 2 2 Hardware Installation Installing the card in your computer Ch 1 to Ch 3 10V REF OUT 10V REF OUT D A A GN D A A GN D A A GN A GN NC 1 I OUT D 2 I OUT D 3 I OUT D D Ch 4 to Ch 6 D A A GN D A A GN D A A GN A GN D GN 5V 12v 4 I OUT D 5 I OUT D 6 I OUT 1 Turn the computer off Turn the power off to any peripheral devices such as printers and monitors 2 Disconnect the power cord and any other cables from the back of the computer Turn the system unit so the back of the unit faces you 3 Remove the system unit cover refer to your computer users guide if necessary unused slot 10 Locate the expansion slots at the rear of the unit and choose any 5 Remove the screw that secures the expansion slot
18. requires 16 consecutive addresses in I O space The most important issue in programming the PCL 726 is understanding the meaning of the 16 registers addressable from the selected I O port base address A summary map of the functions of each address and the data format of each register are given in the following sections 3 2 I O Port Address Map The following table provides the location of each register and driver relative to the base address and its usage Legend D A Analog output D O Digital output DA Digital input DA Digital input R Read operation on that byte W Write operation on that byte Address R W Usage BASE O U D A oh 1 high byte data bit 0 3 BASE t 1 U D A oh 1 low byte data BASE t 2 U D A oh 2 high byte data bit 0 3 BASE 3 W D A oh 2 low byte data BASE 4 U DJA oh 3 high byte data bit 0 3 BASE 5 W D A oh 3 low byte data BASE 6 W D A oh 44 high byte data bit 0 3 BASE 7 U D A oh 4 low byte data BASE t 8 U DJA oh 5 high byte data bit 0 3 BASE 9 W D A oh 5 low byte data BASE 10 W D A oh 6 high byte data bit 0 3 BASE 11 W D A oh 6 low byte data BASE 12 W D O oh 8 15 BASE 13 W D O oh 0 7 BASE 14 R D I oh 8 15 BASE 15 R D I oh 0 7 17 4 3 D A Output Registers The D A output registers are write registers using address BASE 0 to Base 11 Data Format BASE O 2 4 6 8 10 D7 D6 D5 D4 D3 D2 D1 DO D
19. sd D I and D O ports are fully compatible with the valid PC LabCard daughter boards PCLD 782 16 channel opto isolated D I board PCLD 785 16 channel relay output board PCLD 786 8 channel SSR output 8 channel relay driver board d Furnished utility software disk contains Calibration program Demonstration program Program examples DIP switch selectable wait state 0 2 4 6 wait states insertion to ensure the compatibility with very high speed PC s bi Screw terminal board PCLD 780 or PCLD 781 available for D A output signal wiring 1 3 Specifications 1 3 1 Analog Output Channels 6 channels Resolution 12 Bits Double buffered Output range 0 to 5V unipolar 0 to 10V unipolar 5V bipolar 4 to 20mA current loop sink 10V with external DC or AC reference Reference voltage Internal 5V 0 05V 10v 0 05V External Conversion type Analog devices Linearity Accuracy Temperature draft Settling time Current loop DC or AC 10V max 12 bit monolithic multiplying AD7541AKN or equivalent 1 2 bit 0 012 full scale range 2 PPM deg C full scale range 70 usec max with OP 07 output amplifiers 5 usec max with OP 37 output amplifiers upon special request 4 to 20 mA constant current sink Voltage output drive 5mA max Current loop excitation voltage Minimum 8V maximum 36V for 4 to 20mA current loop
20. signal connections and gives an illustration of a wiring diagram The PCL 726 D A functions can be performed in the way by writing I O instructions to the registers directly A commonly used D A application is clearly illustrated in the demonstration program on your diskette The demonstration program DEM0726A BAS on the PCL 726 software diskette provides a complete explanation of programming either a single D A channel or more D A channels The following program examples written in BASIC show how to program D A channel 1 to generate a voltage of 3V 10 Figure out the values of the low and high bytes 20 The jumper is set to 5V reference and unipolar 30 and the D A range is OV to 5V 20 40 V 3 0 50 X V 5 4096 60 X V 5 2048 2048 for bipolar 5V to 5V 70 IF X gt 4095 OR X O THEN PRINT OVERFLOW END 80 HIS X 256 90 LOS X MOD 256 100 Write the value into registers 110 OUT amp H2C0 0 HI OUT amp H2CO 1 LOS 120 END 3 3 Digital Input and Output The PCL 726 provides 16 digital input channels and 16 digital output channels It is fairly straight forward to program the digital input and output channels Attention should be paid to the pin assignments of connectors CNI digital output and CN2 digital input A reading operation on any of the D I ports will read in the value of the 8 corresponding digital input channels To access the D I ports in BASIC use the following statement V
21. yte DIT DI6 DIS DIA DIS DIZ DI1 DIO LEGEND DO15 to DOO Digitaloutput data DO7 to DOO is the low byte data and DO15 to DOT is the high byte data MSB of the digital output port DT15 to DIO Digital input data D17 to DIO is the low byte data and DI15 to DI7 is the high byte data MSB of the digital input port 19 5 APPLICATION 5 1 D A Applications The PCL 726 provides 6 D A channels which use double buffered 12 bit multiplying D A converters The D A registers are write registers using address BASE O to BASE 11 When programming the D A channels please note that the most significant byte high byte data should be sent first It is then temporarily held by a register in the D A and not released to the D A converter After the least significant byte low byte data is written the low byte and high byte are added and passed to the D A converter at the same time This double buffering process protects the D A data integrity through a single step update The PCL 726 provides an internal precision fixed 5V reference If this voltage is used as D A input reference the D A output range will be 0 to 5V You may select other external DC or AC sources as the D A reference inputs The maximum reference voltage is 10V and the maximum D A output range is 10V Connector CN3 and CN4 support all D A signal connections The pin assignment of these connectors is described in Section 2 3 Section 3 2 and 3 3 cover the DIA
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