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PIO-48

48 Channel TTL Digital I / O Board

PIO-48
48 Channel TTL Digital I / O Board
User Manual
PIO-48 User Manual
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 Level 0.7 0.8
Issue Date 05.05.89 21.07.97
Author LP SEJ
Amendment Details First issue Window front cover and new logo
Contents
OUTLINE DESCRIPTION ................................. 1 1.0 SPECIFICATION..................................... 2 1.1 Electrical Specification .............................. 2 1.2 Physical Specification .............................. 2 Electromagnetic Compatibility (EMC)....................... 3 EMC Specification ..................................... 4 2.0 USER ADJUSTMENTS ................................ 5 2.1 Selecting the Base Address........................... 5 Figure 1 - Selecting the Base Address...................... 6 2.2 Port Map ......................................... 7 3.0 ELECTRICAL OPTIONS ............................... 9 3.1 Input conditioning .................................. 9 3.2 Input / Output Connections............................ 9 Pin Detail ........................................... 10 3.3 Connector Pin Details.............................. 11 4.0 OPERATING GUIDE................................ 12 4.1 Using the Device................................. 12 4.2 Programming Guide ............................... 13 4.3 Example Program ................................. 16 5.0 COMMERCIAL DATA ACQUISITION PACKAGES ......... 17 5.1 Use of the PIO-48 Board with ASYST .................. 17
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Contents
APPENDIX A .......................................... 18 APPENDIX B .......................................... 20 PC / XT / AT Port Map ................................... 20 I / O Address Map ..................................... 20 APPENDIX C .......................................... 21 PC / XT Interrupt Map .................................. 21 APPENDIX D .......................................... 22 AT Interrupt Map ..................................... 22 APPENDIX F.......................................... 23 Application Notes for Interfacing the PIO-48................. 23 Glossary............................................ 25
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Outline Description
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OUTLINE DESCRIPTION
This card provides 48 programmable digital I / O channels. It is suitable for sensing the presence of or driving TTL connections only. There is provision for a set of on board pull up resistors to enable the board to be used to detect contact closures on push buttons, relay contacts etc.
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Specification
SPECIFICATIONS Electrical Specification
Physical Specification
Height Width Depth 107mm 15mm 132mm
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Electromagnetic Compatibility (EMC)
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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 problems are caused by the external cabling to the board. Boards fitted with IDC ribbon cable connectors on the metal mounting bracket require particularly careful installation of the external cabling. 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. · To ensure that the board meets the industrial radiated field immunity of 10V / metre, the cable should also be fitted with a ferrite clamp on the external cable as close as possible to the connector. The preferred type is the Chomerics clip-on-style, type H8FE-1004-AS.
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Electromagnetic Compatibility (EMC)
· Ensure that the screen of the ribbon cable is bonded to a good RF earth at the remote end of the cable. · Cables which connect externally to boards at TTL levels should not exceed two metres in length. This restriction does not apply to opto-isolated boards. Failure to observe these recommendations may invalidate the EMC compliance.
Warning This is a Class A product. In a domestic 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 Conducted Immunity: Class A Class A & B
pr EN 50082-2:1991 incorporating: Electrostatic Discharge IEC 801-2:1984 Performance Criteria A IEC 801-3:1984 Performance Criteria A IEC 801-4:1988 Performance Criteria A
Radio Frequency Susceptibility
Fast Burst Transients
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User Adjustments
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USER ADJUSTMENTS Selecting the Base Address
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User Adjustments
Figure 1 - Selecting the Base Address
Note: View board with back panel on RHS. Middle 7 bits of port address on links.
More example addresses are shown in Appendix A. Note: No two cards must occupy the same address.
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User Adjustments
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Port Map
8255 N° 1
8255 N° 2
DATA (8255 PORT A)
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User Adjustments
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Electrical Options
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ELECTRICAL OPTIONS Input conditioning
The 8255 has high impedance inputs. An option is provided to terminate external input lines. This is useful in an electrically noisy environment or where a load is required (e.g. open collector drive). The termination may be pull up (to 5V) or pull down (to 0V) via 6 SIL resistor packs (RP 2-7). Links B-G select pull up or pull down. (See circuit diagram).
Input / Output Connections
A 50 way insulation displacement connector (IDC) is provided on the PC rear panel of the board for I / O channel signal connection. If access to individual channels is required, a 50 way IDC ribbon cable may be used to connect the I / O channels to a 50 way screw terminal block available from Blue Chip Technology as part number ST-24. The pins are numbered as shown in the following diagram. Pins 1-48 contain the I / O channels and pins 49 and 50 are connected to digital ground. 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.
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Electrical Options
Pin Detail
View with gold edge connectors downwards.
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Electrical Options
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Connector Pin Details
Port B
Pin 18 20 22 24 26 28 30 32 Pin 34 36 38 40 42 44 46 48 50
Port C
Digital Ground
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Operating Guide
OPERATING GUIDE Using the Device
A total of 24 I / O channel signals may be connected to each of the 8255 I / O devices on the PIO-48 board providing 6 eight bit ports. Each signal is connected to one bit within one of these ports, i.e.
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Operating Guide
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Programming Guide
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Operating Guide
The state of the output lines may be modified by using either of the following methods:(a) Microsoft BASIC A or GW BASIC. OUT P, D Outputs the byte D to port P. (b) 8088 / 8086 Assembly language PORT EQU 0300H PUTDAT: MOV MOV OUT RET DX, PORT AX, DATA DX, AL
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Operating Guide
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Control Word (Hex) 80 81 82 83 88 89 8A 8B 90 91 92 93 98 99 9A 9B Control Word (Decimal) 128 129 130 131 136 137 138 139 144 145 146 147 152 153 154 155 Sets All of Port A To Output Output Output Output Output Output Output Output Input Input Input Input Input Input Input Input Sets All of Port B To Output Output Input Input Output Output Input Input Output Output Input Input Output Output Input Input Sets High 4 Bits of Port C To Output Output Output Output Input Input Input Input Output Output Output Output Input Input Input Input Sets Low 4 Bits of Port C To Output Input Output Input Output Input Output Input Output Input Output Input Output Input Output Input
Table 3 - Control Word Table
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Operating Guide
Example Program
The above program runs continuously and can only be stopped by pressing control and break on the PC keyboard.
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Commercial Data Acquisition Packages
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COMMERCIAL DATA ACQUISITION PACKAGES
The Blue Chip Technology PIO-48 can be used with almost any data acquisition package that can read information directly from a PC input port.
Use of the PIO-48 Board with ASYST
The board has been tested with and is installable as an 8255.PORT digital device in the ASYST scientific software package by Macmillan Software Company. For more details about this package and other PC data acquisition software please contact Blue Chip Technology. Whilst every effort has been taken to ensure that the information provided is accurate, Blue Chip Technology cannot assume responsibility for any error in this manual or their consequences. Should any errors be detected, the company would greatly appreciate being informed of them. A policy of continuous product development is operated, resulting in the contents of this document being subject to change without notice.
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Appendix A
APPENDIX A
Note: View board with back panel on RHS.
Address Settings for Port 300H
Address Settings for Port 200H
Address Settings for Port 208H
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Appendix A
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Address Settings for Port 210H
Address Settings for Port 220H
Address Settings for Port 230H
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Appendix B
APPENDIX B PC / XT / AT Port Map I / O Address Map
Address 000-01F 020-03F 040-05F 060-06F 070-07F 080-09F 0A0-0BF 0F0 0F1 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
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 Communications, Bisynchronous 2 Reserved for Bisynchronous 1 Reserved Reserved Display Controller Diskette Drive Controller Serial Port 1
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Appendix C
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APPENDIX C PC / XT Interrupt Map
Number NMI 0 1 2 3 Usage Parity Timer Keyboard Reserved Asynchronous Communications (Secondary) SDLC Communications Asynchronous Communications (Primary) SDLC Communications Fixed Disk Diskette Parallel Printer
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Appendix D
APPENDIX D AT Interrupt Map
Level Microprocessor NMI Interrupt Controllers CTLR 1 IRQ 0 IRQ 1 IRQ 2 IRQ 8 IRQ 9 IRQ 10 IRQ 11 IRQ 12 IRQ 13 IRQ 14 IRQ 15 IRQ 3 IRQ 4 IRQ 5 IRQ 6 IRQ 7 CTLR2 Timer Output 0 Keyboard (Output Buffer Full) Interrupt from CTLR 2 Realtime Clock Interrupt Software Redirected to INT 0AH (IRQ 2) Reserved Reserved Reserved Coprocessor Fixed Disk Controller Reserved Serial Port 2 Serial Port 1 Parallel Port 2 Diskette Controller Parallel Port 1 Function Parity or I / O Channel Check
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Appendix F
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APPENDIX F Application Notes for Interfacing the PIO-48
The signals present at ports A, B & C on either the NMOS or CMOS 8255 are TTL (Transistor Transistors Logic) compatible, that is they will interface into standard 74LS logic. However, TTL has limitations when interfacing to other circuitry. The following should be considered when attempting to interface the PIO-48: 1). 2). 3). 4). 5). PIO-48 cannot drive high capacitances. PIO-48 cannot sink loads greater than 2.5mA and retain an output voltage that is TTL compatible. PIO-48 cannot source loads greater than - 200uA (-400uA for CMOS version) and retain an output voltage that is TTL compatible. PIO-48 cannot interface to any voltage greater than VCC (VDD) + 0.5 or lower than - 0.5V. PIO-48 cannot drive long lengths of cable into other TTL compatible devices. TTL is a standard for onboard interfacing primarily and is too susceptible to interference and noise to be used with long cable runs.
General TTL requirement:LOW Input 0.5 - 0.8V Output 0 - 0.45V HIGH 2.0 - Vcc (VDD) 2.4 - Vcc (VDD)
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Appendix F
Characteristics:
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Glossary
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Glossary
VIH High level input voltage - the minimum and maximum voltages that can be applied (ref to 0V) for a high to be recognised. Low level input voltage - the minimum and maximum voltages that can be applied (ref to 0V) for a low to be recognised.
VOH - High level output voltage - the minimum that will be presented at the output as a high at a given max current source current. VOL - Low level output voltage - the maximum voltage that will be presented at the output as a low at a given maximum current load.
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