Channel Analogue Input Board AIP-24 Document Part Document Refere

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AIP-24
Channel Analogue Input Board
AIP-24 Document Part Document Reference Document Issue Level Manual covers PCBs identified 0127-1012 0127-1012.Doc AIP-24
rights reserved. part this publication reproduced, stored retrieval system, transmitted, form means, electronic, mechanical, photocopied, recorded otherwise, without prior permission, writing, from publisher. permission contact Blue Chip Technology. Information offered this manual correct time printing. Blue Chip Technology accepts responsibility inaccuracies. This information subject change without notice. trademarks registered names acknowledged.
Blue Chip Technology Ltd. Chowley Oak, Tattenhall Chester, Cheshire 9EX. Telephone 01829 772000 Facsimile 01829 772001.
Amendment History
Issue Level
Issue Date 24.11.97
Author
Amendment Details First draft Window front cover logo. 98/085
Contents
INTRODUCTION. SPECIFICATIONS Electrical Specification Physical Specification Electromagnetic Compatibility (EMC). Specification USER ADJUSTMENTS Selecting Base Address (JP1) Port ELECTRICAL OPTIONS Input Connections Connector Details. OPERATING GUIDE. Using Device. Programming Guide Example Program COMMERCIAL DATA ACQUISITION PACKAGES AIP-24 Board with ASYST. APPLICATION NOTES Introduction Concepts. Common Mode Voltage. Settling Time. Range Selection. Calibration. APPENDIX APPENDIX APPENDIX APPENDIX
Blue Chip Technology Ltd.
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Introduction
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INTRODUCTION
This card provides differential analogue inputs. suitable measuring voltages ranges 0-10, or-10 volts. board thought number functional blocks each which must correctly handled order achieve desired overall result. main blocks illustrated block diagram. particular signal measured selected from input channels electronic switch (Multiplexer) which controlled writing channel number into latch. This signal then conditioned instrumentation amplifier convert ground reference voltage) amplified programmable gain amplifier which also controlled latch referred earlier detailed Section 2.2. Finally, voltage signal converted converter digital signal which read host computer shown detail later (Section
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Introduction
Address Select Links Proc Converter Proc Sample Hold Amplifier Latch Proc Programmable Gain Amplifier Proc Instrumentation Amplifier Interface Logic Channel Multiplexer Data Connector Ribbon Cable
DC/DC Conv
Quick Start Experience User those Users hurry this product perform sure that factory settings ports 300-303 (768-771 Decimal) don't conflict with other boards computer, then just plug board program AIPMON demo disk. readings displayed likely change continually inputs connected. unused input should shorted zero reading guaranteed. Further changes induced touching bare pins connector. This must attempted there possibility that charged with static electricity.
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Specifications
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SPECIFICATIONS
Electrical Specification
Number Inputs Maximum Input Voltage Power Requirement Power Dissipation Conversion Time Settling Time Throughput
Watts Microseconds Microseconds (Unity Gain) 16KHz
Physical Specification
Height Width Depth 107mm 15mm 132mm
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Specifications
ELECTROMAGNETIC COMPATIBILITY (EMC)
This product meets requirements European Directive (89/336/EEC) eligible bear mark. been assessed operating Blue Chip Technology Icon industrial However, because board installed variety computers, certain conditions have applied ensure that compatibility maintained. meets requirements industrial environment Class product) subject those conditions. board must installed computer system which provides screening suitable industrial environment. recommendations made computer system manufacturer/supplier must complied with regarding earthing installation boards. board must installed with backplate securely screwed chassis computer ensure good metal-to-metal (i.e. earth) contact. Most problems caused external cabling boards. Analogue boards fitted with ribbon cable connectors metal mounting bracket require particularly careful installation external cabling. imperative that external cabling board totally screened, that screen cable connects metal bracket board hence earth. cabling must totally screened; type ribbon cable which rolled round form with braided wire screen best. Standard ribbon cable will adequate unless contained wholly within cabinetry housing industrial Keep unscreened section short possible. mounting bracket board includes captive screen earth point. Connect screen cable this shortest possible wire.
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Specifications
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difficulty with interference experienced cable should also fitted with ferrite clamp close possible connector. preferred type Chomerics clip-on style, type H8FE-1004-AS. recommended that cables kept short possible, particularly when dealing with level signals. Ensure that screen external cable bonded good earth remote cable. Failure observe these recommendations invalidate compliance.
Warning This Class product. domestic environment this product cause radio interference which case user required take adequate measures.
Specification Blue Chip Technology Icon industrial fitted with this card meets following specification: Emissions: 55022:1995 Radiated Conducted Immunity: 50082-1:1992 incorporating Electrostatic Discharge 801-2:1984 Performance Criteria 801-3:1984 Performance Criteria 801-4:1988 Performance Criteria
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Class Class
Radio Frequency Susceptibility
Fast Burst Transients
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User Adjustments
USER ADJUSTMENTS
Selecting Base Address (JP1)
board located slot motherboard, must appear specified position `address') computer's port map. Available positions shown IBM-PC Technical Reference Guide. However, those possess copy this document good place location normally allocated prototyping card supplied IBM. This address (hex) (decimal). Blue Chip Technology cards preset this address factory. However, devices should used while same address since contention will occur neither board will work. your machine contains card with conflicting address then another reasonably safe address (hex). links board base address board within IBM-PC port map. address binary with presence link representing absence link representing
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User Adjustments
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base address (768 decimal) pattern links indicated below:
Figure Selecting Base Address More example addresses shown Appendix Note: cards must occupy same address. Port
order card channel must selected, conversion started data read back. This controlled four ports which have specified functions described below.
Address Base Base Base Base Read Lower Bits data Upper four bits data busy digital input Write Multiplexer channel select gain select Start Conversion
Gain Select
Channel Select
ADDRESS XX0H (W/O)
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Electrical Options
ELECTRICAL OPTIONS
Input Connections
insulation displacement connector (IDC) provided rear panel board input signal connection. access individual channels required, ribbon cable used connect inputs rail mounting screw terminal block available from Blue Chip Technology part number ST-24. pins numbered shown following diagram. Pins 1-48 contain input channels. analogue inputs differential with even numbered pins being positive numbered pins being negative AIP-24 conform with other cards range. inputs level buffer which appear bits port action shorting these pins ground switches them from thus providing method detecting contact closure suitable using triggers data acquisition software. When connector viewed from back system, numbered pins left even numbered pins right with connector. Detail
View with gold edge connector downwards.
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Electrical Options
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Connector Details
Function Channel Channel Channel Channel Channel Channel Channel Channel Channel Channel Channel Channel Channel Channel Channel Channel Channel Channel Channel Channel Channel Channel Channel Channel Trigger Input (Pulled Ohm) Function Channel Channel Channel Channel Channel Channel Channel Channel Channel Channel Channel Channel Channel Channel Channel Channel Channel Channel Channel Channel Channel Channel Channel Channel
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Operating Guide
OPERATING GUIDE
Using Device
total input signals connected AIP-24 contains only analogue digital converter chip inputs achieved using analogue multiplexers which select appropriate channel defined state lower bits mutliplexwe select port (PORT These feed selected differential signal into instrumentation amplifier which converts signal into single ended drive. This turn feeds programmable gain amplifier (PGA 102) gain which controlled bits multiplexer channel select port (PORT output then taken sample hold amplifier (AD585), which freezes signal during conversion. Significant errors arise when changing signals measured boards without sample hold amplifier. conversion "BUSY" signal appears port monitored under software control determine conversion cycle which takes about microseconds. More information about converter instrumentation found appropriate data sheet chip from Analog Devices Limited. typical sequence events card would Select channel writing 0-23 Base gain being used then value written Base when selecting channel must tale this into account (see Port Map). instance, gain being used then must added required channel number gain 100. Write value Base begin conversion. Read Base monitor busy bit. conversion time microseconds. When using fast language (e.g. Assembler) necessary ensure that finished converting analogue signal before reading result. This achieved checking Base However, this necessary when using slow language (e.g. Basic).
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Operating Guide
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Read Base Read Base Combine Base Base result. Programming Guide
value input determined using following method subroutine Microsoft BASIC BASIC:
CONTAINS VALUE REQUESTED CHANNEL P=AIP24 BASE PORT NUMBER P,CH P+1,0 ;START CONVERSION L=INP (P+2): H=INP (P+3) ;GET HIGH HALVES NUMBER &H20 THEN ;WAIT CONVERSION FINISH N=256*(H N-2047 BI-POLAR MODE THIS LINE NEEDED RETURN ANALOGUE VALUE
Example Program
following program written Microsoft BASIC will under BASIC BASIC interpreter intended display values inputs AIP-24 ports screen decimal. This enables user state each input channel. base address used program decimal which default factory setting link
PROGRAM TEST AIP-24 BOARD LOCATE STEP LOCATE GOSUB P=P+1 P>23 THEN PRINT NEXT NEXT GOTO
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Operating Guide &H300, &H301, A=INP (&H302) :B=INP (&H303) N=(256*C) 2047 TAKE THIS LINE UNI-POLAR MODE RETURN
program cycles continuously stopped pressing ControlBreak keyboard.
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Commercial Data Acquisition Packages
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COMMERCIAL DATA ACQUISITION PACKAGES
Blue Chip Technology Iap-24 used with almost data acquisition package that read information directly from input port. AIP-24 Board with ASYST
board been tested with installable IO.PORT devices ASYST scientific software package Macmillan Software Company. not, however, installed normal analogue device. more details about this package other data acquisition software, please contact Blue Chip Technology.
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Application Notes
APPLICATION NOTES
Introduction Concepts
order make best this board useful understand concepts differential common mode signals. typical application might involve bridge transducer below:
+20v
10.8V
AIP-24
Where voltages expressed relative same zero (ground) voltage used computer. This typically arises because both transducer computer safety earth their zero volt reference. user wants bridge signal which (10.8 9.9)V 0.9V. does this automatically because input differential, i.e. measures difference between signals. alternative type input called single-ended measures input relative zero volts. single-ended inputs could used measure bridge voltages above difference calculated computr give true differential bridge signal.
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Application Notes
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above example input circuitry board sees differential signal 0.9V superimposed upon common mode signal 9.9V. common mode voltage sense common both inputs. circuitry accept input voltages +/-12V with respect computer ground. Signals outside this range lead false readings both channel involved other channels. this reason board said have common mode voltage range. acceptable have example signal superimposed upon common mode signal 11V, since input would which outside acceptable range. When necessary measure differential signals with common mode component which exceeds input capability AIP, then either individual isolation amplifiers used together with AIP. Common Mode Voltage
This board used solid-state multiplexers. These devices will operate properly either signal voltage input exceeds -12volts. These limits define common mode voltage range. board differential input will accept signals which floating with respect computer system ground. these signals must still within common mode voltage range (CMVR) order obtain satisfactory operation. some cases necessary external signals computer ground suitable resistors hold them within CMVR. Failure result erratic readings. board provides resistors (1M) which used pull input signals towards ground, fitting links This resistor value generally proves satisfactory, lower values needed electrically noisy environments. Since resistors combination with multiplexer resistance form potential divider, there will small attenuation signal. This less than with resistors easily corrected during calibration.
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Application Notes
Settling Time
When input channel switched analogue circuitry will take short time settle value. This referred settling time. settling time combination settling times individual stages involved i.e. instrumentation amplifier, programmable gain amplifier, sample hold together with filters. switching time mutliplexer short compared with these other factors considered further. manufacturers figures settling 0.01% given below microseconds:
Gain Instrumentation Amplifier Programmable Gain Amplifier Sample Hold 15.0 22.8 15.0 22.8 15.0 28.2
These figures worst case full step input ignore fact that stages settle together, sequentially. major contribution made settling time on-board filters. Three filters provided board reduce interference high frequency noise. filters formed R12/C19 R13/C20. third filter formed on-resistance multiplexer devices, (typically 360R total). three filters give nominal time constant 10uS. However, period around time constants required allow settling .01%. cases where very fast conversion required filters eliminated removing C19, C24. Further speed improvements made eliminating programmable gain amplifier assuming only unity gain required using faster amplifiers. Conversion speed ablso improved using alternative compatible devices ADC.
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Application Notes
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program `SETTLAIP' allows settling time measured. order program board address 300H, apply volts channel volts channel program creates variable setting delay. When program will show reading effected reducing delay time allowed settling. delay executing assembler `LOOP' instruction number times. program displays number `LOOPS' performed, reading obtained ratio this reading with very long settling time. Theoretically, reading reaches 0.63 full value, when settling time equal time constant. least five time constants should allowed settling accuracy.
Range Selection
board used measure either uni-polar (positive polarity only) bipolar (negative positive) signals according link settings board. standard version board supplied from factory bi-polar +10V -10V (i.e. 5mV/vbit). Other versions supplied special order board re-configured re-calibrated user. input range links Links select uni-polar bi-polar mode. bi-polar mode selected fitting links positions only, whereas uni-polar mode selected fitting links bi-polar mode used reading with short circuit input 2047 (zero setting). both bi-polar modes sets full scale span converter. position marked (corresponding 2.5mV/bit), span i.e. +10V uni-polar bi-polar. Similarly, when position (5mV/bit) span +20V +10V -10V. Note that inputs above +12V cannot measured properly discussed Section 6.1.
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Application Notes
6.5.1
Calibration Uni-polar +/-10V Range Remove links Check position (normally 2.5) discussed above. Apply (1.25mV) adjust that reading changing between This sets zero point. Apply 10.000V input check measured value. Adjust needed give correct reading. standard factory calibration adjust reading 4000 10.000V input (i.e. 2.5mV/bit). This sets full scale reading. Bi-polar Remove links Check position above. Short input adjust that reading 2047. Apply either +5.000V (for LB=2.5) +10.000V (for LB=5) adjust give reading 4047. Apply -5.000V +10.000V corresponding check reading 47+/-1.
iii.
6.5.2
iii.
Note above procedures sample software available disk supplied with board which performs average allows finer adjustment calibration. Whilst ever effort been taken ensure that information provided accurate, Blue Chip Technology cannot assume responsibility errors this manual their consequences. Should errors detected, company would greatly appreciate being informed them preferably writing. policy continuous product development operated, resulting contents this document being subject change without notice.
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Appendix
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APPENDIX
Note: View board with back panel RHS. Address Settings Port 300H
Address Settings Port 200H
Address Settings Port 204H
Address Settings Port 210H
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Appendix
Address Settings Port 220H
Address Settings Port 230H
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Appendix
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APPENDIX
PC/XT/AT Port Address Address (Hex) 000-01F 020-03F 040-05F 060-06F 070-07F 080-09F 0A0-0BF 0F8-0FF 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
Controller 8237A-5 Interrupt Controller 8259A Timer, 8254 Keyboard Controller 8742; Control Port CMOS RAM, Mask (Write) Page Register (Memory Mapper) Interrupt Controller 8259 Clear (80287) Busy Reset NPX, 80287 Numeric Processor Extension, 80287 Hard Disk Drive Controller Reserved Reserved Parallel Printer Port Reserved Serial Port Reserved Reserved Parallel Printer Port Reserved SDLC Comms, Bisynch Reserved Bisynch Reserved Reserved Display Controller Diskette Drive Controller Serial Port
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Appendix
APPENDIX
PC/XT Interrupt Number Parity Timer Keyboard Reserved Asynchronous Communications (Secondary) SDLC Communications Asynchronous Communications (Primary) SDLC Communications Fixed Disk Diskette Parallel Printer Usage
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APPENDIX
Interrupt Level Function
Microprocessor Parity Channel Check Interrupt Controllers CTLR CTLR2 Timer Output Keyboard (Output Buffer Full) Interrupt from CTLR Realtime Clock Interrupt Software redirected (IRQ Reserved Reserved Reserved Coprocessor Fixed Disk Controller Reserved Serial Port Serial Port Parallel Port Diskette Controller Parallel Port
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Typical Methods Interfacing From Card Other Circuitry
Single Ended Input From Linear Transducer
Differential Input From
P1/2
P1/2
P1/1
P1/1
Variable Voltage Input From Temperature Censor
Differential Input From Wheatstone Bridge
P1/2 P1/1
P1/2 P1/1
LM35
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Channel Analogue Input Board AIP-24 Document Part Document Refere

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