Acces PAD128 User manual

ACCES I/O PRODUCTS INC
10623 Roselle Street, San Diego, CA 92121
TEL [phone] FAX [phone]
MODEL PAD128
USER MANUAL
FILE: MPAD128.D1g

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Notice
The information in this document is provided for reference only. ACCES does not assume any liability
arising out of the application or use of the information or products described herein. This document may
contain or reference information and products protected by copyrights or patents and does not convey any
license under the patent rights of ACCES, nor the rights of others.
IBM PC, PC/XT, and PC/AT are registered trademarks of the International Business Machines Corporation.
Printed in USA.
© Copyright 2001 by ACCES I/O Products Inc, 10623 Roselle Street, San Diego, CA 92121. All rights reserved.
U.S. Patent No.s 4,603,320 and 4,972,470.

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Warranty
Prior to shipment, ACCES equipment is thoroughly inspected and tested to applicable specifications.
However, should equipment failure occur, ACCES assures its customers that prompt service and support
will be available. All equipment originally manufactured by ACCES which is found to be defective will be
repaired or replaced subject to the following considerations.
Terms and Conditions
If a unit is suspected of failure, contact ACCES' Customer Service department. Be prepared to give the unit
model number, serial number, and a description of the failure symptom(s). We may suggest some simple
tests to confirm the failure. We will assign a Return Material Authorization (RMA) number which must
appear on theouter label of the return package. All units/componentsshould be properly packed for handling
and returned with freight prepaid to the ACCES designated Service Center, and will be returned to the
customer's/user's site freight prepaid and invoiced.
Coverage
First Three Years: Returned unit/part will be repaired and/or replaced at ACCES option with no charge for
labor or parts not excluded by warranty. Warranty commences with equipment shipment.
Following Years: Throughout your equipment's lifetime, ACCES stands ready to provide on-site or in-plant
service at reasonable rates similar to those of other manufacturers in the industry.
Equipment Not Manufactured by ACCES
Equipment provided but not manufactured by ACCES is warranted and will be repaired according to the
terms and conditions of the respective equipment manufacturer's warranty.
General
Under this Warranty, liability of ACCES is limited to replacing, repairing or issuing credit (at ACCES
discretion) for any products which are proved to be defective during the warranty period. In no case is
ACCES liable for consequential or special damage arriving from use or misuse of our product. The
customer is responsible for all charges caused by modifications or additions to ACCES equipment not
approved in writing by ACCES or, if in ACCES opinion the equipment has been subjected to abnormal use.
"Abnormal use" for purposes of this warranty is defined as any use to which the equipment is exposed other
than that use specified or intended as evidenced by purchase or sales representation. Other than the above,
no other warranty, expressed or implied, shall apply to any and all such equipment furnished or sold by
ACCES.

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Table of Contents
Notice ..............................................................iii
Warranty ...........................................................iv
FOREWORD ........................................................iii
Guarantee ..........................................................iv
Limited Warranty ....................................................iv
Return Procedure .................................................... v
Limitation of Liability ................................................. v
Advisories ..........................................................vi
Chapter 1: Introduction ..............................................1-1
Description ........................................................... 1-1
Data Acquisition ....................................................... 1-1
Digital Input/Output ..................................................... 1-1
Special Functions ...................................................... 1-2
Utility Software ........................................................ 1-2
Specifications ......................................................... 1-2
Regulatory Compliance .................................................. 1-3
Chapter 2: Installation ...............................................2-1
CD Installation ......................................................... 2-1
3.5-Inch Diskette Installation .............................................. 2-1
Directories Created on the Hard Disk ....................................... 2-2
Installing the Card ...................................................... 2-4
Chapter 3: Cable Connections ........................................3-1
Chapter 4: Address Selection .........................................4-1
Chapter 5: Software .................................................5-1
Setup Program ........................................................ 5-1
Sample Programs ...................................................... 5-1
Chapter 6: Programming .............................................6-1
Port Addresses and Functions ............................................ 6-1
Analog Inputs ......................................................... 6-6
Digital I/O ............................................................ 6-8
Programming Example .................................................. 6-8
Appendix A: 8255 Data Sheet ........................................ A-1
Appendix B: LM12H458 Data Sheet ................................... B-1

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List of Figures
Figure 1-1: PAD128 Block Diagram ........................................... 1-4
List of Tables
Table 4-1: Standard Address Assignments for 286/386/486 Computers ............... 4-1
Table 6-1: PAD128 Register Definition Map (HEX) ............................... 6-1

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Manual MPAD128.D1g
Chapter 1: Introduction
Features
•Type II PCMCIA Card.
•12-Bit Analog-to-Digital Converter.
•Up to Eight Analog Inputs.
•32 Sample FIFO Buffer.
•Two 8-Bit Digital I/O Ports.
Description
Model PAD128 is a Type II PCMCIA card (PC Card). It performs data acquisition on up to eight
analog inputs and provides parallel digital input/output capability for up to 16 bits. A 24-inch long
cable that mates with the PAD128 on one end and has a 37-pin male sub-D connector on the other
end is available as Model CAB-37PC.
Data Acquisition
The analog-inputconfiguration is software controlled on a channel-by-channel basis and you can
have any combination of single-ended and differential inputs that adds up to eight pins. For
example, you could have two single-ended inputs referred to one ground and four other single-ended
inputs that are referred to another ground. Or you could have four differential inputs. Or you could
have two single-ended inputs and three differential inputs. If you are using differential inputs, you
must use channels with the same full-scale range. In the standard card, there are four ranges.
Therefore, you would have to pair channels 0 and 1, 2 and 3, 4 and 5, and 6 and 7. The same rule
holds true if you use any of the inputs as a ground reference for another input. The signal input and
its ground should use channels with the same full-scale range. If you are planning to refer multiple
channels to a particular non-card ground, you should consult the factory for a special version of the
card that has enough channels of the same range to accommodate the total number of inputs and the
ground.
The analog-to-digital converter provides 12-bit resolution. Overall throughput rate is 129,000
Samples/second. Conversions are normally initiated by a programmable on-card pacer clock. The
A/D converter has self-calibration capability (to eliminate linearity and zero-drift errors) and a
32-sample FIFO buffer. The buffer allows accumulation of data while the computer is servicing
other requests.

PAD128 Manual
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Digital Input/Output
The PAD128 also has capability for 16 digital input/output bits that can be programmed as inputs
or outputs on a groups-of-eight basis. This function is based on the industry-standard type 8255
programmable peripheral interface and the A and B ports are available for use.
Special Functions
Control logic in the PAD128 uses a programmable array and special functions can be factory
programmed. If you have need for special functions such as external synchronization give us a call.
Utility Software
Programs on 3½" diskette or CD-ROM are included with the PAD128. These programs are based
on the assumption that the PCMCIA Card and Socket Services have been loaded on the host
computer to provide the software interface to the card slot drive (these services are normally
provided by Windows).
The diskette/CD includes a program called FINDBASE that helps you find an unused base address
to use with the card when using DOS. PAD128 supports base addresses from 100h to 3FFh. Also,
there is a TSR memory-resident program required to configure the card for it to be recognized by
the Card and Socket Services when using DOS.
Sample programs in 6 languages (Borland C 3.5, Turbo Pascal 7.0, C++Builder 3, Delphi 4.0, Visual
C++ 5.0, and Visual BASIC 5.0) are provided.
Specifications
Data Acquisition
•Analog Inputs: As many as eight single-ended inputs, or four differential inputs, or a
mixture of both but not to exceed use of eight input pins. (See the
limitation on pairing mentioned in the Data Acquisition section.)
•Input Voltage Range: Ch 0 and 1: ± 10V; Ch 2 and 3: ± 5V; Ch 4 and 5: 0-5V;
Ch 6 and 7: 0-0.1V .
Note
These are the default ranges. If your card has been modified, there will be an addendum sheet in the
front of the manual.

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Manual MPAD128.D1g
A/D Converter Accuracy
•Common Mode Rejection Ratio (diff'l inputs): 75 db at power line frequency (20 Khz
sample rate).
•Full-Scale Error (after auto-cal): ±½ LSB typical, ±2 LSB max.
•Integral Linearity (after auto-cal): ±½ LSB typical, ±1 LSB max.
•Resolution: 12 bits.
•Maximum Throughput Rate: 129K Samples/Sec.
System Accuracy
•Gain accuracy of each range is ± 2 % of reading
•Uncertainty in reading (noise) varies depending on range, from ± 1 LSB for ±10V range
to ± 2 LSB on the 0-100mV range.
Digital Input/Output
Inputs
•Logic High: 2.0 to 5.0 VDC
•Logic Low: -0.3 to +0.8 VDC
•Input Load (high): +3.2 :A.
•Input Load (low): -250 :A.
Outputs
•Logic High: 2.5 VDC min., source 200 :A.
•Logic Low: 0.5 VDC max., sink 1.7 mA.
Environmental
•Operating Temperature Range: 0 °C. to 60 °C.
•Storage Temperature Range: -50 °C. to +120 °C.
•Humidity: 5% to 95% RH, non-condensing.
•Power Required: Operating: +5 VDC @ 47 mA typical, 65 mA max.
•Form Factor: PCMCIA type II.
Regulatory Compliance
CE Compliance: Testing not completed at print time. Please check with us for certification status.

PAD128 Manual
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Figure 1-1: PAD128 Block Diagram