AIP-24 Data Acquisition Card User Manual
Contents
1. 20v ve AIP 24 10 8V ve OV Where voltages are expressed relative to the same zero ground voltage as used by the computer This typically arises because both the transducer and computer use the safety earth as their zero volt reference Now the user wants to see the bridge signal which is 10 8 9 9 V or 0 9V The AIP does this automatically because its input is differential i e it measures the difference between the two signals The alternative type of input is called single ended and measures an input relative to zero volts Two single ended inputs could be used to measure the bridge voltages above and the difference calculated by the computr to give the true differential bridge signal Page 14 01271012 doc Blue Chip Technology Ltd Application Notes Page 15 In the above example the input circuitry of the AIP board sees a differential signal of 0 9V superimposed upon a common mode signal of 9 9V The common mode voltage is in a sense of common to both inputs The AIP circuitry can accept input voltages of up to 12V with respect to the computer ground Signals outside this range can lead to false readings both on the channel involved and other channels For this reason the board is said to have a 12V common mode voltage range It is not acceptable to have for example a 3V signal superimposed upon a common mode signal of 11V since one input would be at 14 which is outside the acceptable range When it is necessary to m2. Note for the above procedures sample software is available on the disk supplied with the board which performs an average and allows finer adjustment of the calibration Whilst ever effort has been taken to ensure that the information provided is accurate Blue Chip Technology cannot assume responsibility for any errors in this manual or their consequences Should any errors be detected the company would greatly appreciate being informed of them preferably in writing A policy of continuous product development is operated resulting in the contents of this document being subject to change without notice Page 18 01271012 doc Blue Chip Technology Ltd Appendix A APPENDIX A Note View board with back panel on RHS Address Settings for Port 300H e pfatotolaliols o 10 20 40 80 100 200 Address Settings for Port 200H se lofoelototel o 10 20 40 80 100 200 Address Settings for Port 204H s s lefelototalo 10 20 40 80 100 200 Address Settings for Port 210H s Bloo lolo 10 20 40 80 100 200 Blue Chip Technology Ltd 01271012 doc Page 19 Page 19 Page 20 Appendix A Address Settings for Port 220H s Blee fetal 5 10 20 40 80 100 200 Address Settings for Port 230H 289338885 10 20 40 80 100 200 Page 20 01271012 doc Blue Chip Technology Ltd Appendix B Page 21 APPENDIX B PC XT AT Port Map I O Address Map Address Hex 000 01F 020 03F 040 05F 060 06F 070 07F 0
3. Technology as part number ST 24 The pins are numbered as shown in the following diagram Pins 1 48 contain the input channels The analogue inputs are differential with the even numbered pins being positive and the odd numbered pins being negative on the AIP 24 to conform with the other cards in the range Pin 49 and 50 are inputs to a TTL level buffer which appear as the top two bits on port 3 The action of shorting these pins to ground switches them from a to a0 thus providing a method of detecting a contact closure suitable for using as triggers for data acquisition software When the connector is viewed from the back of the system odd numbered pins are on the left and even numbered pins are on the right with pin 1 at the top of the connector Pin Detail View with gold edge connector downwards Page 8 01271012 doc Blue Chip Technology Ltd Electrical Options Page 9 3 2 Connector Pin Details Function Pin Pin Function Channel 2 ve 5 O 6 Channel 2 ve Channel _3 ve 7 O O 8 Channel 3 ve Channel 4 ve 9 O 10 Channel 4 ve TTL Trigger Input 490 50 GND Pulled up to 5V by 4K7 Ohm Blue Chip Technology Ltd 01271012 doc Page 9 Page 10 Operating Guide 4 0 OPERATING GUIDE 4 1 Using the Device A total of 24 input signals may be connected to the AIP 24 contains only one analogue to digital converter chip the 24 inputs are achieved by using analogue multip
4. 16 16 16 16 ENAO ENAN ENAZ ENAS ENAS ENAS LE AT S AAA eh Se IES E YN 2 2 2 2 2 2 A ic 15 c16 ic 17 c18 c19 LG LH AG C R10 RW 1M 1M 2 BN IN VOUT CSEN gi E ws a 2 CEANA IN SENSE CFOR 2 10 k A m2 AN e cio REF MINT VOUT T MN vout n z da 5 15 w e 2 z e 900 vine mg Que PGA102 c1000 ca NULLI RIN 10 3 10 _ ra VINS OA NULL2 RFB 16 KoL 8 n 5 AD585 e kRez pz CA3 042 SIE v 3 12 GND 6 D 8 e13 GND NC REF 13 py HOLD isv ag 3 TC 12 HOLD PGSELO SAX2 O HOLD 7 TND va POSELI Sas f n e7 2 POS v Hsv 5 16 cg iv CF Hsv isv VALUE VARIES DEPENDING ON THE VERSION OF UNIT SEE BILL OF MATERIALS FOR INFORMATION ISSUE NO ISSUE NO ISSUE NO ISSUE NO ISSUE NO 3 ISSUE NO 2 BLI i C F TIP THE C F INOLO G Y LIN ATTE D IC s 14 TO 19 WERE SCHEMATIC UPDATED TO MAIN AVENUE HAWARDEN INDUSTRIAL PARK DEESIDE CHS 3PP TEL 0244 520222 TELEX 61471 DG509 CURRENT PARTS LIST SCALE A3 0 66 TITLE o Mo AIP24 REV F CHK D c ANALOG INPUT PATH DWN APPD DATE DWN APPD DATE DWN APPD DATE DWN APPD DATE DWN APPD DATE DWN APPD DATE DRAWN S E MMc 10 06 91 GM MMc 17 01 01 DATE 87 09 09 DRAWING NUMBER AIP24F2C Iss 2 1 2 5 4 5 6 7 8 9 10
5. APPD DATE DWN APPD DATE DWN APPD DATE DWN APPD DATE DWN APPD DATE DWN APPD DATE ORAWN S E GM MMe 177011 AP W MMe 51 1014 DATE 87 09 09 DRAWING NUMBER AIP24F1C iss 3 1 2 3 5 7 8 E 10 Rhia Chin Tarhnalaau tA N1971N19 Ann Dana 9R 1 2 3 4 5 6 7 8 9 10 A ANA ANA ANA ANA ANA ANA LE IVA UTA TS 3 7 GA oum vo GINA orale 57 IMA oun 37 NA OUTA 1 IVA oua 3 INA IN 19 gt ne 27177 Iza 35 17 nza a E s HA 13 NA a NA 29 NSA 37 NA 45 7 INGA WAX359 WAX359 MAX359 MAX 350 MAX350 MAX359 7 ona 15 a 23 N44 rm BD aa oa DS ANAS ANA ANAS ANA ANA ANA 27 7g N18 OUTS 10 17 7g M ours 1807 qa MB outs 26 7 7g NB ours 347 73 e OUTS 4207 qa MS outs DGND 15 DGND 15 DGND 15 DEND 15 DGND 15 DEND 15 Pis one one oN ones one 4 12 4y 14 7 12 v 14 cs 12 4y 14 io 12 4y 14 e 12 via AN 12 4y 14 V 3 V3 V 3 V3 v3 V3 e 8 14 NB 22 NB 30 s 38 2 NB 6 88 8 HN 16 NAB e e Et e 40 2588 48 7 e B CHSELO CHSELO CHSELO CHSELO CHSELO CHSELO 14 __ 40 1A VA a0 Y 80 rh ar lai CHSELI CHSELI CHSELI CHSELI CHSELI CHSELI YB YA A tay 1p SHBEL 1p SEBEL tay a tay 16 16
6. environment this product may cause radio interference in which case the user may be required to take adequate measures EMC Specification A Blue Chip Technology Icon industrial PC fitted with this card meets the following specification Emissions EN 55022 1995 Radiated Class A Conducted Class A amp B Immunity EN 50082 1 1992 incorporating Electrostatic Discharge TEC 801 2 1984 Performance Criteria B Radio Frequency Susceptibility IEC 801 3 1984 Performance Criteria A Fast Burst Transients IEC 801 4 1988 Performance Criteria B Blue Chip Technology Ltd 01271012 doc Page 5 Page 6 User Adjustments 2 0 USER ADJUSTMENTS 2 1 Selecting the Base Address JP1 The board may be located in any 62 pin ISA slot in the PC motherboard but must be set up to appear at a specified position or address in the computer s port map Available positions are shown in the IBM PC Technical Reference Guide However for those who do not possess a copy of this document a good place is the location normally allocated to the prototyping card as supplied by IBM This address is 300 hex or 768 decimal All Blue Chip Technology cards are preset to this address at the factory However no two devices should be used while set to the same address since contention will occur and neither board will work If your machine contains a card with a conflicting address then another reasonably safe address is 200 to 21F hex A set of
7. problems are caused by the external cabling to boards Analogue boards fitted with IDC ribbon cable connectors on the metal mounting bracket require particularly careful installation of the external cabling It is imperative that any external cabling to the board is totally screened and that the screen of the cable connects to the metal end bracket of the board and hence to earth The cabling must be totally screened the type of ribbon cable which is rolled to a round form with a braided wire screen is best Standard ribbon cable will not be adequate unless it is contained wholly within the cabinetry housing the industrial PC Keep the unscreened section as short as possible The mounting bracket of the board includes a captive nut as an screen earth point Connect the screen of the cable to this by the shortest possible wire Page 4 01271012 doc Blue Chip Technology Ltd Specifications Page 5 e If difficulty with interference is experienced the cable should also be fitted with a ferrite clamp as close possible to the connector The preferred type is the Chomerics clip on style type H8FE 1004 AS e It is recommended that cables are kept as short as possible particularly when dealing with low level signals e Ensure that the screen of the external cable is bonded to a good RF earth at the remote end of the cable Failure to observe these recommendations may invalidate the EMC compliance Warning This is a Class A product In a domestic
8. 1 TO 80 STEP 10 60 LOCATE Y X 70 GOSUB 150 80 P P 1 90 IF P gt 23 THEN P 0 100 PRINT N 110 NEXT 120 NEXT 130 GOTO 40 Blue Chip Technology Ltd 01271012 doc Page 11 Page 12 Operating Guide 150 OUT amp H300 P 160 OUT amp H301 O 170 A INP amp H302 B INP amp H303 180 C B AND amp HF 190 N 256 C A 200 N N 2047 TAKE THIS LINE OUT FOR UNI POLAR MODE 210 RETURN The program cycles continuously and has to be stopped by pressing Control Break on the PC keyboard Page 12 01271012 doc Blue Chip Technology Ltd Commercial Data Acquisition Packages Page 13 5 0 COMMERCIAL DATA ACQUISITION PACKAGES The Blue Chip Technology Iap 24 can be used with almost any data acquisition package that can read information directly from a PC input port 5 1 Use of the AIP 24 Board with ASYST The board has been tested with and is installable as 2 IO PORT devices in the ASYST scientific software package by Macmillan Software Company It is not however installed as a normal analogue device For more details about this package and other PC data acquisition software please contact Blue Chip Technology Blue Chip Technology Ltd 01271012 doc Page 13 Page 14 Application Notes 6 0 APPLICATION NOTES 6 1 Introduction to Concepts In order to make best use of this board it is useful to understand the concepts of differential and common mode signals A typical application might involve a bridge transducer as below
9. 80 09F OA0 0BF OFO OF1 OF8 OFF 1F0 1F8 200 207 278 27F 2F8 2FF 300 31F 360 36F 378 37F 380 38F 3A0 3AF 3B0 3BF 3C0 3CF 3D0 3DF 3F0 3F7 3F8 3FF Allocated to DMA Controller 1 8237A 5 Interrupt Controller 1 8259A Timer 8254 Keyboard Controller 8742 Control Port B RTC And CMOS RAM NMI Mask Write DMA Page Register Memory Mapper Interrupt Controller 2 8259 Clear NPX 80287 Busy Reset NPX 80287 Numeric Processor Extension 80287 Hard Disk Drive Controller Reserved Reserved For Parallel Printer Port 2 Reserved For Serial Port 2 Reserved Reserved Parallel Printer Port 1 Reserved For SDLC Comms Bisynch 2 Reserved For Bisynch 1 Reserved Reserved Display Controller Diskette Drive Controller Serial Port 1 Blue Chip Technology Ltd 01271012 doc Page 21 Page 22 Appendix C APPENDIX C PC XT Interrupt Map Number NMI S D Sun Page 22 Usage Parity Timer Keyboard Reserved Asynchronous Communications Secondary SDLC Communications Asynchronous Communications Primary SDLC Communications Fixed Disk Diskette Parallel Printer 01271012 doc Blue Chip Technology Ltd APPENDIX D AT Interrupt Map Level Function Microprocessor NMI Parity or I O Channel Check Interrupt Controllers CTLR 1 IRQO IRQ 1 IRQ 2 IRQ 3 IRQ 4 IRQ 5 IRQ 6 IRQ7 Blue Chip Technology Ltd CTLR2 IRQ 8 IRQ 9 IRQ 10 IRQ 11 IRQ 12 IRQ 13 IRQ 14 IRQ 15
10. AIP 24 24 Channel Analogue Input Board Blue Chip Technology User Manual AIP 24 User Manual Document Part N 0127 1012 Document Reference 0127 1012 Doc Document Issue Level 1 2 Manual covers PCBs identified AIP 24 Rev F All rights reserved No part of this publication may be reproduced stored in any retrieval system or transmitted in any form or by any means electronic mechanical photocopied recorded or otherwise without the prior permission in writing from the publisher For permission in the UK contact Blue Chip Technology Information offered in this manual is correct at the time of printing Blue Chip Technology accepts no responsibility for any inaccuracies This information is subject to change without notice All trademarks and registered names acknowledged Blue Chip Technology Ltd Chowley Oak Tattenhall Chester Cheshire CH3 9EX Telephone 01829 772000 Facsimile 01829 772001 Amendment History Issue Issue Amendment Details Level Date a First drat 1 2 24 11 97 SEJ Window front cover and logo See ECN 98 085 Contents 1 0 INTRODUCTION irin aa a A R 2 1 0 SPECIFICATIONS consorte reo rre 2 1 1 Electrical Specification ooonnninnnccnnnndnnnnnccoccccnnnncnnnnnarrncnnnncanannns 3 1 2 Physical Specification rriorse ainarra Aan Aa anaa 3 Electromagnetic Compatibility EMC 3 EMC SpecificatiQn sarne naisina aa aAA EAN ANARAN EK ANERER 5 2 0 USER A
11. DJUSTMENTS iii 6 2 1 Selecting the Base Address JP1 6 2 2 POM MAP is riranin n aa aaa aE EnS 7 3 0 ELECTRICAL OPTIONS iii 8 3 1 Input Connections coooocccccccnnnncconanonnnccnnnnconnnnn non c cnn nn rn nnnnnrnncnn 8 3 2 Connector Pin Details 9 4 0 OPERATING GUIDES iii 10 4 1 Using the Device ss 10 4 2 Programming Guide 11 4 3 Example Program ccccccceeeeeeeeeccceeeeeeeeeeeccaaaeeeeeeeeseeetaaaes 11 5 0 COMMERCIAL DATA ACQUISITION PACKAGES 2 000 13 5 1 Use of the AIP 24 Board with ASYST 13 6 0 APPLICATION NOTES ii 14 6 1 Introduction to Concepts 14 6 2 Common Mode Voltage 15 6 3 Settling TIME SAR a 15 6 4 Range Selection nn cnn cnn cnnnnnn nn 17 6 5 GalibratOn is aeiia minis 17 APPENDIX A LES LR tl la O 18 APPENDIX BD ne annee nana r a nest eine 20 APRENDIX Coscucantonattodetote dato catetodaret caras 21 APPENDIX D cis doin ida ani a cdi 22 Blue Chip Technology Ltd 01271012 doc Introduction Page 1 1 0 INTRODUCTION This card provides 24 differential 12 bit analogue inputs It is suitable for measuring voltages in the ranges of 0 10 5 to 5 or 10 to 10 volts The AIP board may be thought of as s number of functional blocks each of which must be correctly handled in order to achieve the desired overall result The main blocks are illustrated in the block diagram The particular signal to be measured is selected from the 24 input channels by an electronic swi
12. Timer Output 0 Keyboard Output Buffer Full Interrupt from CTLR 2 Realtime Clock Interrupt Software redirected to INT OAH IRQ 2 Reserved Reserved Reserved Coprocessor Fixed Disk Controller Reserved Serial Port 2 Serial Port 1 Parallel Port 2 Diskette Controller Parallel Port 1 01271012 doc Page 23 Typical Methods of Interfacing From the AIP Card to Other Circuitry Single Ended Input From A Linear Transducer Differential Inout From An LDR 12V Variable Voltage Inout From A Temperature Censor 7 1 2 3 4 5 e 7 a E 10 Be ii ADCDO Dao ADCOS 080 bao CHSELO ENAG Do peo DBO rs EN iov T zal Az Az D Yo 1A 1y 4 O A B En ADGDI 081 ADCD9 pet m1 Le 14 7 17 A 7 DIS ra 1 Ancoz A az Aocoio 02 2 2 2 18 4 18 4 O ADCD3 DB3 ADCDI 03 D3 T 6 E iad BT 75 Al 15 s o RS Re bea ADCD4 13245 B4 apepiz _ 15245 054 D4 e 20 74 2 A ve 14 A al tol
13. easure differential signals with a common mode component which exceeds the input capability of the AIP then either individual isolation amplifiers can be used together with the AIP 6 2 Common Mode Voltage This board used solid state multiplexers These devices will not operate properly is either signal voltage input exceeds or 12volts These limits define the common mode voltage range The board has a differential input and will accept signals which are floating with respect to the computer system ground But these signals must still lie within the common mode voltage range CMVR in order to obtain satisfactory operation In some cases it may be necessary to tie external signals to the computer ground via suitable resistors to hold them within CMVR Failure to do so may result in erratic readings The board provides resistors R10 and R11 1M which may be used to pull the input signals towards ground by fitting links LG and LH This resistor value generally proves satisfactory but lower values may be needed in electrically noisy environments Since the resistors in combination with the multiplexer resistance form a potential divider there will be a small attenuation of the signal This is less than one bit with 1M resistors and can easily be corrected for during calibration Blue Chip Technology Ltd 01271012 doc Page 15 Page 16 Application Notes 6 3 Settling Time When the input channel is switched the analogue circuitry will take a sh
14. i polar mode is selected by fitting links at LE and LF In the bi polar mode RV2 is used to set the reading with a short circuit input to 2047 zero setting For both uni and bi polar modes LB sets the full scale span of the converter In the position marked 2 5 corresponding to 2 5mV bit the span is 10V i e O to 10V uni polar or 5 to 5V bi polar Similarly when LB is in the 5 position SmV bit the span is 0 to 20V or 10V to 10V Note that inputs above 12V cannot be measured properly as discussed in Section 6 1 Blue Chip Technology Ltd 01271012 doc Page 17 Page 18 Application Notes 6 5 Calibration 6 5 1 Uni polar 10V Range i Remove links LC LD and fit at LE LF Check position of LB normally 2 5 as discussed above ii Apply 0 5 LSB 1 25mV and adjust RV2 so that the reading is changing between 0 and 1 This sets the zero point 111 Apply 10 000V to one input and check the measured value Adjust RV1 if needed to give the correct reading The standard factory calibration is to adjust the reading to be 4000 for 10 000V input i e 2 5mV bit This sets the full scale reading 6 5 2 Bi polar i Remove links LE LF and fit at LC LD Check position of LB as 6 3 above ii Short one input and adjust RV2 so that the reading is 2047 111 Apply either 5 000V for LB 2 5 or 10 000V for LB 5 and adjust RV1 to give a reading of 4047 iv Apply 5 000V or 10 000V corresponding to iii and check reading is 47 1
15. lexers which select the appropriate channel s defined by the state of the lower 5 bits of the mutliplexwe select port PORT 0 These feed the selected differential signal into an instrumentation amplifier which converts the signal into single ended drive This in turn feeds the programmable gain amplifier PGA 102 the gain of which is controlled by bits 5 and 6 f the multiplexer channel select port PORT 0 The output of the PGA is then taken to a sample and hold amplifier AD585 which freezes the signal during conversion Significant errors can arise when changing signals are measured by boards without a sample and hold amplifier The conversion BUSY signal appears as bit 5 of port 3 and can be monitored under software control to determine the end of the conversion cycle which takes about 25 microseconds More information about the converter and the instrumentation amp can be found in the appropriate data sheet on the chip from Analog Devices Limited A typical sequence of events to use the card would be 1 Select the channel by writing 0 23 to Base 0 If gain is being used then the value written to Base 0 when selecting the channel must tale this into account see Port Map For instance if a gain of 10 is being used then 32 must be added to the required channel number or 64 for a gain of 100 2 Write any value to Base 1 to begin conversion 3 Read Base 3 and monitor the ADC busy bit The ADC conversion time is 25 mic
16. links on the board set the base address of the board within the IBM PC port map The address is in binary with the presence of a link representing a 0 and the absence of a link representing a 1 Page 6 01271012 doc Blue Chip Technology Ltd User Adjustments Page 7 To set the base address to 300 hex 768 decimal set the pattern on the links as indicated below BREESE 2 10 20 40 80 100 200 Figure 1 Selecting the Base Address More example addresses are shown in Appendix A Note No Two cards must occupy the same address 2 2 Port Map In order to use the AIP card a channel must be selected conversion started and data read back This is controlled via four 8 bit ports which have specified functions as described below Address p Bed u Base 0 Multiplexer channel select gain A Start Conversion Lower 8 Bits of data Base 3 Upper four bits of data busy bit digital input bit Bit 6 5 4 3 2 1 0 ADDRESS XX0H W O Gain Select Channel Select 00 x1 0 to 23 01 x 10 10 x 100 Blue Chip Technology Ltd 01271012 doc Page 7 Page 8 Electrical Options 3 0 ELECTRICAL OPTIONS 3 1 Input Connections A 50 way insulation displacement connector IDC is provided on the PC rear panel of the board for input signal connection If access to individual channels is required a 50 way IDC ribbon cable may be used to connect the inputs to 50 way DIN rail mounting screw terminal block available from Blue Chip
17. ort time to settle to the new value This is referred to as the settling time The settling time is a combination of the settling times for the individual stages involved i e instrumentation amplifier programmable gain amplifier sample and hold together with an filters The switching time of the mutliplexer is short compared with these other factors and so is not considered further The manufacturers figures for settling to 0 01 are given below in microseconds Gain 1 Instrumentation Amplifier 15 0 Programmable Gain Amplifier 2 8 Sample and Hold 5 0 Sum These figures are worst case for a full 20V step input and ignore the fact that all stages settle together not sequentially A major contribution is made to settling time by the on board filters Three RC filters are provided on the board to reduce interference by high frequency noise Two filters are formed by R12 C19 and R13 C20 The third filter is formed by C24 and the on resistance of the multiplexer devices typically 360R total The three filters give a nominal time constant of 10uS However a period of around ten time constants is required to allow settling to 01 In cases where very fast conversion is required the filters may be eliminated be removing C19 C20 and C24 Further speed improvements may be made by eliminating the programmable gain amplifier assuming only unity gain is required and by using faster amplifiers Conversion speed may ablso be improved by u
18. ould be shorted out for a zero reading to be guaranteed Further changes can be induced by touching the bare pins of the IDC connector This must not be attempted if there is any possibility that you are charged with static electricity Page 2 01271012 doc Blue Chip Technology Ltd Specifications Page 3 1 0 SPECIFICATIONS 1 1 Electrical Specification 25 Microseconds Settling Time 25 Microseconds Unity Gain Throughput 16KHz on IBM AT 1 2 Physical Specification Blue Chip Technology Ltd 01271012 doc Page 3 Page 4 Specifications ELECTROMAGNETIC COMPATIBILITY EMC This product meets the requirements of the European EMC Directive 89 336 EEC and is eligible to bear the CE mark It has been assessed operating in a Blue Chip Technology Icon industrial PC However because the board can be installed in a variety of computers certain conditions have to be applied to ensure that the compatibility is maintained It meets the requirements for an industrial environment Class A product subject to those conditions The board must be installed in a computer system which provides screening suitable for the industrial environment Any recommendations made by the computer system manufacturer supplier must be complied with regarding earthing and the installation of boards The board must be installed with the backplate securely screwed to the chassis of the computer to ensure good metal to metal i e earth contact Most EMC
19. roseconds When using a fast language e g Assembler it it necessary to ensure that the ADC has finished converting the analogue signal before reading the result This s achieved by checking bit 5 of Base 3 However this is not necessary when using a slow language e g Basic Page 10 01271012 doc Blue Chip Technology Ltd Operating Guide Page 11 4 Read Base 2 5 Read Base 3 6 Combine Base 2 and Base 3 to get the result 4 2 Programming Guide The value of an input may be determined by using the following method as a subroutine in Microsoft BASIC A or GW BASIC 10 REM CH CONTAINS VALUE FOR REQUESTED CHANNEL 20 REM P AIP24 BASE PORT NUMBER 30 OUT P CH 40 OUT P 1 0 START CONVERSION 50 L INP P 2 H INP P 3 GET LOW AND HIGH HALVES OF NUMBER 60 IF HAND amp H20 THEN 50 WAIT FOR CONVERSION TO FINISH 70 N 256 H and 15 L 80 N N 2047 IF BI POLAR MODE THIS LINE IS NEEDED 90 RETURN 100 REM N THE ANALOGUE VALUE 4 3 Example Program The following program written in Microsoft BASIC will run under the BASIC A or GW BASIC interpreter and is intended to display the values of the inputs of the AIP 24 ports on the screen in decimal This enables the user to see the state of each input channel The base address used for the program is 300 Hex or 768 decimal which is the default factory setting for link A 10 REM PROGRAM TO TEST AIP 24 BOARD 20 CLS KEY OFF LOCATE 1 1 30 P 0 40 FOR Y 1 TO3 50 FOR X
20. sar Ho ps ADCOS os 4 21 Eo R7 IR AD574 ay AG 6 nies an ADCD6 es IIR L1200R 1 2y 12 Vee 1 2 ce Veo PND 5 07 ADCO7 o7 Syv 7 23 E B ADCDA B y AGND DBA nA a 9 2 ye ole Deg ee 10k 5 25 Apco10 g REFOUT 0810 Apenit REFIN pet 10 27 sx BUSY 14 Re sm fica 5 Ra 15V are 5V vh hd 5v dor 5V j v 8207 74 Nt 250mA c c cn caj cz3 RE 10u 100n 1000 242 1000 750 25V 25 as cel cs c17 ce cas cs A2 ENADGL as VB y Y a p mac 100n 400n 22 Auf t00n 100n 1007 A O 31 la 1 Pi eva 6v3 As ENADCH SE zP akg 4 nop ca clo cra ca mM cHcuk eno 1000 10u 100m ua 160n A7 00 Pall rc al me mo q 25v A5 sc co SND n pee ar de 4 1 73 pr Uso Cr Se 15655 20 Baas ancom ae sus A257 71 a el at Ao PE zl mb 7 a A7 i BUS a HOLD AM EI ral Ve 7 ae e AO rai SP f axy D AB AM BDIR Hav D a23 O a a a n r 75 Pr se CT i I ag iow Ben B o a2 a M LT B ei ur a Pr 10 I tong Ji AEN BUS IOR 25 Lan I 98 PaPa ct zl ES dl il ce aL cr ic4 i il bal 87 CT AN VALUE VARIES DEPENDING ON THE VERSION OF UNIT SEE BILL OF MATERIALS FOR INFORMATION ISSUE NO ISSUE NO ISSUE ND ISSUE NO ISSUE NO 3 ISSUE NO 2 a BLUE CHIP TECHNOLOGY LIMITED ISSUE OF PARTS LIST Preven MAIN AVENUE HAWARDEN INDUSTRIAL PARK DEESIDE CH5 3PP TEL 0244 520222 TELEX 61471 ADDED SCALE A3 0 66 TITLE NM AIP24 REV F EURE E ADC DIGITAL amp POWER SUPPLY CIRCUITS DWN
21. sing alternative pin compatible devices for the ADC Page 16 01271012 doc Blue Chip Technology Ltd Application Notes Page 17 The program SETTLAIP allows the settling time to be measured In order to use the program set the board address to 300H apply 10 volts to channel 0 and 0 volts to channel 1 The program creates a variable setting delay When the program is run it will show how the reading is effected by reducing the delay time allowed for settling The delay is set by executing the assembler LOOP instruction number of times The program displays the number of LOOPS performed the reading obtained and the ratio of this to the reading with a very long settling time Theoretically the reading reaches 0 63 of its full value when the settling time is equal to the time constant At least five time constants should be allowed for settling to 12 bit accuracy 6 4 Range Selection The board my used to measure either uni polar positive polarity only or bi polar negative and positive signals according to the link settings on the board The standard version of the board as supplied from the factory is bi polar 10V to 10V i e 5mV vbit Other versions can be supplied to special order or the board may be re configured and re calibrated by the user The input range is set by links Links LC and LF select uni polar or bi polar mode The bi polar mode is selected by fitting links at positions LC and LD only whereas the un
22. tch Multiplexer which is controlled by writing the channel number into a latch This signal is then conditioned by an instrumentation amplifier to convert it to ground reference voltage and amplified by a programmable gain amplifier which is also controlled by the latch referred to earlier as detailed in Section 2 2 Finally the voltage signal is converted by the A to D converter to a digital signal which may be read by the host computer as shown in detail later Section 4 Blue Chip Technology Ltd 01271012 doc Page 1 Page 2 Introduction syu pajas sselppy AUuoQ 9d 9d EH Proc ess o 12 bit A to D Converter Proc ess Sample and Hold Amplifier Proc ess yoje7 gt Programmable Gain Amplifie 91607 aoejuaju sng EH Proc ess E Instrumentation Amplifier 24 Channel Multiplexer Data 50 Way IDC Connector Ribbon Cable GS a Eg A Quick Start for the Experience User For those Users who are in a hurry to see this product perform and are sure that the factory settings for the ports of 300 303 Hex 768 771 Decimal don t conflict with any other boards in the computer then just plug the board in and run the program AIPMON on the demo disk The readings displayed are likely to change continually if the inputs are not connected Any unused input sh
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