National Instruments AT-DIO-32F User manual

© Copyright 1989, 1995 National Instruments Corporation.
All Rights Reserved.
AT-DIO-32F
User Manual
High-Speed 32-Bit Parallel Digital I/O Interface for the PC
April 1995 Edition
Part Number 320147-01

National Instruments Corporate Headquarters
6504 Bridge Point Parkway
Austin, TX 78730-5039
[phone]
Technical support fax: [phone]
[phone]
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Switzerland 056/20 51 51, Taiwan 02 377 1200, U.K. 0635 523545

Limited Warranty
The AT-DIO-32F is warranted against defects in materials and workmanship for a period of one year from the date
of shipment, as evidenced by receipts or other documentation. National Instruments will, at its option, repair or
replace equipment that proves to be defective during the warranty period. This warranty includes parts and labor.
The media on which you receive National Instruments software are warranted not to fail to execute programming
instructions, due to defects in materials and workmanship, for a period of 90 days from date of shipment, as
evidenced by receipts or other documentation. National Instruments will, at its option, repair or replace software
media that do not execute programming instructions if National Instruments receives notice of such defects during
the warranty period. National Instruments does not warrant that the operation of the software shall be uninterrupted
or error free.
A Return Material Authorization (RMA) number must be obtained from the factory and clearly marked on the
outside of the package before any equipment will be accepted for warranty work. National Instruments will pay the
shipping costs of returning to the owner parts which are covered by warranty.
National Instruments believes that the information in this manual is accurate. The document has been carefully
reviewed for technical accuracy. In the event that technical or typographical errors exist, National Instruments
reserves the right to make changes to subsequent editions of this document without prior notice to holders of this
edition. The reader should consult National Instruments if errors are suspected. In no event shall National
Instruments be liable for any damages arising out of or related to this document or the information contained in it.
EXCEPT AS SPECIFIED HEREIN, NATIONAL INSTRUMENTS MAKES NO WARRANTIES, EXPRESS OR IMPLIED,
AND SPECIFICALLY DISCLAIMS ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR
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OF NATIONAL INSTRUMENTS SHALL BE LIMITED TO THE AMOUNT THERETOFORE PAID BY THE CUSTOMER.
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USE OF PRODUCTS, OR INCIDENTAL OR CONSEQUENTIAL DAMAGES, EVEN IF ADVISED OF THE POSSIBILITY
THEREOF. This limitation of the liability of National Instruments will apply regardless of the form of action,
whether in contract or tort, including negligence. Any action against National Instruments must be brought within
one year after the cause of action accrues. National Instruments shall not be liable for any delay in performance due
to causes beyond its reasonable control. The warranty provided herein does not cover damages, defects,
malfunctions, or service failures caused by owner's failure to follow the National Instruments installation, operation,
or maintenance instructions; owner's modification of the product; owner's abuse, misuse, or negligent acts; and
power failure or surges, fire, flood, accident, actions of third parties, or other events outside reasonable control.
Copyright
Under the copyright laws, this publication may not be reproduced or transmitted in any form, electronic or
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in part, without the prior written consent of National Instruments Corporation.
Trademarks
LabVIEW®, NI-DAQ®, and RTSI®are trademarks of National Instruments Corporation.
Product and company names listed are trademarks or trade names of their respective companies.

Warning Regarding Medical and Clinical Use
of National Instruments Products
National Instruments products are not designed with components and testing intended to ensure a level of reliability
suitable for use in treatment and diagnosis of humans. Applications of National Instruments products involving
medical or clinical treatment can create a potential for accidental injury caused by product failure, or by errors on the
part of the user or application designer. Any use or application of National Instruments products for or involving
medical or clinical treatment must be performed by properly trained and qualified medical personnel, and all
traditional medical safeguards, equipment, and procedures that are appropriate in the particular situation to prevent
serious injury or death should always continue to be used when National Instruments products are being used.
National Instruments products are NOT intended to be a substitute for any form of established process, procedure, or
equipment used to monitor or safeguard human health and safety in medical or clinical treatment.

© National Instruments Corporation v AT-DIO-32F User Manual
Contents
About This Manual............................................................................................................xi
Introduction to the AT-DIO-32F...................................................................................xi
Organization of This Manual ........................................................................................xi
Conventions Used in This Manual ................................................................................xii
Related Documentation .................................................................................................xii
Customer Communication.............................................................................................xii
Chapter 1
Introduction..........................................................................................................................1-1
What Your Kit Should Contain.....................................................................................1-2
Optional Software..........................................................................................................1-3
Optional Equipment ......................................................................................................1-4
Unpacking ....................................................................................................................1-5
Chapter 2
Configuration and Installation .....................................................................................2-1
Board Configuration......................................................................................................2-1
AT Bus Interface ...............................................................................................2-1
Base I/O Address Selection...............................................................................2-4
DMA Channel Selection ...................................................................................2-7
Interrupt Selection .............................................................................................2-9
RTSI Bus Clock Selection.................................................................................2-10
Installation.....................................................................................................................2-12
Signal Connections........................................................................................................2-13
I/O Connector Pin Description..........................................................................2-13
Signal Connection Descriptions ........................................................................2-14
I/O Connector Electrical Specifications........................................................................2-16
I/O Signals Rating .............................................................................................2-16
Input Signal Specifications................................................................................2-16
Output Signal Specifications.............................................................................2-16
Timing Specifications....................................................................................................2-16
AT-DIO-32F Read and Write Timing...............................................................2-18
Cabling ..........................................................................................................................2-19
Chapter 3
Theory of Operation..........................................................................................................3-1
Address Decoder ...........................................................................................................3-2
Bus Transceivers ...........................................................................................................3-2
PC I/O Channel Control Circuitry.................................................................................3-2
Configuration and Status Registers ...............................................................................3-2
Data Latches and Drivers ..............................................................................................3-2
Onboard Counters..........................................................................................................3-3
Digital I/O Connector....................................................................................................3-4

Contents
AT-DIO-32F User Manual vi © National Instruments Corporation
Handshaking Circuitry ..................................................................................................3-4
Level Mode........................................................................................................3-5
Leading Edge Mode ..........................................................................................3-7
Trailing Edge Mode...........................................................................................3-9
Interrupt Control Circuitry ............................................................................................3-10
DMA Control Circuitry.................................................................................................3-10
RTSI Bus Interface........................................................................................................3-11
Chapter 4
Programming.......................................................................................................................4-1
Register Map .................................................................................................................4-1
Register Sizes ....................................................................................................4-3
Register Description..........................................................................................4-3
Register Description Format .................................................................4-3
Configuration and Status Register Group .........................................................4-4
CFG1 Register.......................................................................................4-5
CFG2 Register.......................................................................................4-8
CFG3 Register.......................................................................................4-11
CFG4 Register.......................................................................................4-14
STAT Register.......................................................................................4-16
CNTINTCLR Register ..........................................................................4-18
DMACLR1 Register..............................................................................4-19
DMACLR2 Register..............................................................................4-20
Digital I/O Port Register Group ........................................................................4-21
Port A Register ......................................................................................4-22
Port B Register ......................................................................................4-23
Port C Register ......................................................................................4-24
Port D Register ......................................................................................4-25
RTSI Bus Register Group..................................................................................4-26
RTSISHFT Register ..............................................................................4-27
RTSISTRB Register..............................................................................4-28
Counter Register Group.....................................................................................4-29
CNTR1 Register (REQ1 Generator) .....................................................4-30
CNTR2 Register (REQ2 Generator) .....................................................4-31
CNTR3 Register (Timebase Generator)................................................4-32
CNTRCMD Register.............................................................................4-33
Programming Considerations........................................................................................4-37
Initializing the AT-DIO-32F Board ..................................................................4-37
Mode 0 Programming........................................................................................4-38
Mode 1 Programming........................................................................................4-38
Leading Edge Mode ..............................................................................4-41
Trailing Edge Mode...............................................................................4-42
Data Settling Delay ...............................................................................4-43
Programmed I/O Transfers....................................................................4-43
Input Data Latch....................................................................................4-44
Interrupt Handling .................................................................................4-44
DMA Transfers......................................................................................4-48
32-Bit Transfers.....................................................................................4-48
Pattern Generation Using Onboard Counters....................................................4-49

Contents
© National Instruments Corporation vii AT-DIO-32F User Manual
Pattern Generation Using an External Signal....................................................4-53
Programming the RTSI Bus Interface...............................................................4-53
Programming the RTSI Bus Switch ......................................................4-54
Initializing the RTSI Bus Switch........................................................... 4-55
Appendix A
Specifications .......................................................................................................................A-1
Appendix B
I/O Connector and Register Descriptions .................................................................B-1
I/O Connector................................................................................................................B-1
AT-DIO-32F Register Descriptions ..............................................................................B-2
CFG1 Register...................................................................................................B-2
CFG2 Register...................................................................................................B-2
CFG3 Register...................................................................................................B-2
CFG4 Register...................................................................................................B-2
STAT Register...................................................................................................B-3
CNTINTCLR Register ......................................................................................B-3
DMACLR1 Register..........................................................................................B-3
DMACLR2 Register..........................................................................................B-3
Port A Register ..................................................................................................B-3
Port B Register ..................................................................................................B-3
Port C Register ..................................................................................................B-4
Port D Register ..................................................................................................B-4
RTSISHFT Register ..........................................................................................B-4
RTSISTRB Register..........................................................................................B-4
CNTR1 Register (REQ1 Generator) .................................................................B-4
CNTR2 Register (REQ2 Generator) .................................................................B-4
CNTR3 Register (Timebase Generator)............................................................B-5
CNTRCMD Register.........................................................................................B-5
Read-Back Command............................................................................B-5
Status Byte.............................................................................................B-5
Appendix C
Application Notes ...............................................................................................................C-1
Communicating with a Printer ......................................................................................C-1
Cabling ..............................................................................................................C-1
Sending Files to be Printed................................................................................C-2
AT-DIO-32F to AT-DIO-32F 16-Bit Communications................................................C-4
Cabling ..............................................................................................................C-5
Sending and Receiving files with the AT-DIO-32F..........................................C-5
The AT-DIO-32F and I/O Module Racks .....................................................................C-10
Appendix D
Intel Data Sheet...................................................................................................................D-1

Contents
AT-DIO-32F User Manual viii © National Instruments Corporation
Appendix E
Customer Communication..............................................................................................E-1
Glossary .....................................................................................................................Glossary-1
Index..................................................................................................................................Index-1
Figures
Figure 2-1. AT-DIO-32-F Parts Locator Diagram...............................................................2-3
Figure 2-2. Example Base I/O Address Switch Settings .....................................................2-5
Figure 2-3. DMA Jumper Settings for DMA Channels 5 and 6 (Factory Settings).............2-8
Figure 2-4. DMA Jumper Settings for DMA Channel 5 Only ............................................ 2-8
Figure 2-5. DMA Jumper Settings for Disabling DMA Transfers ......................................2-9
Figure 2-6. Interrupt Jumper Settings IRQ11 and IRQ12 (Factory Settings)......................2-9
Figure 2-7. Interrupt Jumper Settings for Disabling Interrupts............................................2-10
Figure 2-8. Interrupt Jumper Setting IRQ5 Only.................................................................2-10
Figure 2-9. Disconnect from RTSI Bus Clock;
Use Onboard Oscillator (Factory Settings) ......................................................2-11
Figure 2-10. Receive RTSI Bus Clock Signal ......................................................................2-11
Figure 2-11. Drive RTSI Bus Clock Signal with Onboard Oscillator ...................................2-11
Figure 2-12. Digital I/O Connector Pin Assignments ...........................................................2-13
Figure 3-1. AT-DIO-32F Block Diagram ............................................................................3-1
Figure 3-2. AT-DIO-32F Clock Routing Scheme................................................................3-4
Figure 3-3. Level Mode – Read ...........................................................................................3-5
Figure 3-4. Level Mode – Write ..........................................................................................3-6
Figure 3-5. Leading Edge Mode – Read ..............................................................................3-7
Figure 3-6. Leading Edge Mode – Write .............................................................................3-8
Figure 3-7. Trailing Edge Mode – Read ..............................................................................3-9
Figure 3-8. Trailing Edge Mode – Write .............................................................................3-10
Figure 4-1. Level Mode Write Handshake Timing..............................................................4-40
Figure 4-2. Level Mode Read Handshake Timing...............................................................4-40
Figure 4-3. Leading Edge Mode Write Handshake Timing (LPULSExcleared)................4-41
Figure 4-4. Leading Edge Mode Read Handshake Timing (LPULSExcleared).................4-41
Figure 4-5. Leading Edge Mode Read/Write ACK Pulse Width
with LPULSExof CFG4 Set .............................................................................4-41
Figure 4-6. Trailing Edge Mode Write Handshake Timing.................................................4-42
Figure 4-7. Trailing Edge Mode Read Handshake Timing..................................................4-42
Figure 4-8. Pattern Generation.............................................................................................4-51
Figure 4-9. RTSI Switch Control Pattern.............................................................................4-54
Figure B-1. AT-DIO-32F I/O Connector ............................................................................. B-1

Contents
© National Instruments Corporation ix AT-DIO-32F User Manual
Tables
Table 2-1. AT-DIO-32F Factory-Set Jumper and Switch Settings ...................................2-2
Table 2-2. Default Settings of National Instruments Products for the PC..........................2-6
Table 2-3. Switch Settings with Corresponding Base I/O Address and
Base I/O Address Space ....................................................................................2-7
Table 2-4. DMA Channels for the AT-DIO-32F ............................................................... 2-8
Table 2-5. Configurations for RTSI Bus Clock Selection .................................................2-11
Table 4-1. AT-DIO-32F Register Map...............................................................................4-2
Table 4-2. CFG1 Data-Settling Time Settings.................................................................... 4-43
Table 4-3. Interrupt Condition and Status ..........................................................................4-45
Table 4-4. Counter 3 Programmable Frequency Output.....................................................4-49
Table 4-5. Counters 1 and 2 Programmable Frequency Output (Source = 10 MHz).........4-50
Table 4-6. RTSI Switch Signal Connections......................................................................4-53
Table C-1. Cable Specification for Connections to
8, 16, or 24-channel I/O Module Racks ............................................................C-10

© National Instruments Corporation xi AT-DIO-32F User Manual
About This Manual
Introduction to the AT-DIO-32F
The AT-DIO-32F is a high-speed, 32-bit, parallel, digital I/O interface. The AT-DIO-32F is a
member of the National Instruments AT Series of PC AT I/O channel expansion boards for the
IBM PC AT and compatible computers. These boards are designed for high-performance data
acquisition and control for applications in laboratory testing, production testing, and industrial
process monitoring and control.
This manual describes the installation, basic programming considerations, and theory of
operation for the AT-DIO-32F. Example programs are provided in the C programming
language.
Organization of This Manual
The manual is divided into the following chapters and appendixes:
• Chapter 1, Introduction, describes the AT-DIO-32F, lists the contents of your AT-DIO-32F
kit, and explains how to unpack the AT-DIO-32F kit.
• Chapter 2, Configuration and Installation, explains the installation of the AT-DIO-32F board
into your computer, signal connections to the AT-DIO-32F board, and cable wiring.
• Chapter 3, Theory of Operation, explains the basic operation of the AT-DIO-32F circuitry.
• Chapter 4, Programming, describes in detail the address and function of each of the
AT-DIO-32F control and status registers. This chapter also includes important information
about programming the AT-DIO-32F.
• Appendix A, Specifications, lists the specifications for the AT-DIO-32F.
• Appendix B, I/O Connector and Register Descriptions, contains a description of the
AT-DIO-32F I/O connector and references to the registers of the AT-DIO-32F.
• Appendix C, Application Notes,contains the application notes for the AT-DIO-32F board.
• Appendix D, Intel Data Sheet,contains the 8254 Programmable Interval Timer (Intel
Corporation) data sheet. This counter/timer device is used on the AT-DIO-32F board.
• Appendix E, Customer Communication, contains forms for you to complete to facilitate
communications with National Instruments concerning our products.
• The Glossary contains an alphabetical list and description of terms used in this manual,
including abbreviations, acronyms, metric prefixes, mnemonics, symbols, and terms.
• The Index alphabetically lists topics covered in this manual, including the page where the
topic can be found.

About This Manual
AT-DIO-32F User Manual xii © National Instruments Corporation
Conventions Used in This Manual
The following conventions are used throughout this manual:
italic Italic text denotes emphasis, a cross reference, or an introduction to a key
concept.
NI-DAQ NI-DAQ is used throughout this manual to refer to the NI-DAQ software
for DOS/Windows/LabWindows unless otherwise noted
PC PC refers to the IBM PC AT and compatible computers.
Related Documentation
The following manual contains information that you may find helpful as you read this manual:
•IBM Personal Computer AT Technical Reference manual
You may also want to consult the following manual if you plan to program the Intel 8254-2
Counter/Timer used on the AT-DIO-32F:
•Intel 8254 System Timing Controller technical manual
Customer Communication
National Instruments wants to receive your comments on our products and manuals. We are
interested in the applications you develop with our products, and we want to help if you have
problems with them. To make it easy for you to contact us, this manual contains comment and
configuration forms for you to complete. These forms are in Appendix E, Customer
Communication, at the end of this manual.

© National Instruments Corporation 1-1 AT-DIO-32F User Manual
Chapter 1
Introduction
This chapter describes the AT-DIO-32F, lists the contents of your AT-DIO-32F kit, and explains
how to unpack the AT-DIO-32F kit.
The AT-DIO-32F is a high-speed, 32-bit, parallel, digital I/O interface board for the PC. The 32
lines of digital I/O are organized into four 8-bit ports. With the various handshaking options
available, the AT-DIO-32F is compatible with a wide range of peripheral devices and other
computers. The AT-DIO-32F can be used for interrupt handling and DMA transfers on two
DMA channels. Onboard counters can be used for pattern generation. A RTSI bus interface can
transfer signals from other AT Series boards to the AT-DIO-32F.
All digital I/O is transferred through a standard, 50-pin, male connector. The pin assignments for
this connector are compatible with the DEC DRV11J parallel interface and most standard
32-channel digital I/O applications.
The AT-DIO-32F can be used in a wide range of digital I/O applications. With the AT-DIO-32F,
a digital pattern generator can be implemented, or the PC can be interfaced to any of the
following:
• Other computers
– Another IBM PC/XT, PC AT, or compatible computer with a National Instruments
PC-DIO-24 or AT-DIO-32F
– IBM Personal System/2 computer with a National Instruments MC-DIO-24 or
MC-DIO-32F
– Apple Macintosh II computer with a National Instruments NB-DIO-24 or NB-DIO-32F
– DEC, UNIBUS, or Q-BUS system with a 16-bit interface
– DEC LSI-11 microcomputer with a 32-bit DRV11J interface
– Any other computer with an 8-bit, 16-bit, or 32-bit parallel interface
• Centronics-compatible printers and plotters
• Panel meters
• Instruments and test equipment with BCD readouts and/or controls
• Opto-isolated solid-state relays and I/O module mounting racks
With the AT-DIO-32F, the PC can serve as a digital I/O system controller for laboratory testing,
production testing, and industrial process monitoring and control.

Introduction Chapter 1
AT-DIO-32F User Manual 1-2 © National Instruments Corporation
What Your Kit Should Contain
The contents of the AT-DIO-32F kit (part number 776246-01) are listed as follows.
Kit Component Part Number
AT-DIO-32F board
AT-DIO-32F User Manual
NI-DAQ software for DOS/Windows/LabWindows, with manuals
NI-DAQ Software Reference Manual for DOS/Windows/LabWindows
NI-DAQ Function Reference Manual for DOS/Windows/LabWindows
180735-01
320147-01
776250-01
320498-01
320499-01
If your kit is missing any of the components, contact National Instruments.
Your AT-DIO-32F is shipped with the NI-DAQ software for DOS/Windows/LabWindows.
NI-DAQ has a library of functions that can be called from your application programming
environment. These functions include routines for analog input (A/D conversion), buffered data
acquisition (high-speed A/D conversion), analog output (D/A conversion), waveform generation,
digital I/O, counter/timer, SCXI, RTSI, and self-calibration. NI-DAQ maintains a consistent
software interface among its different versions so you can switch between platforms with
minimal modifications to your code. NI-DAQ comes with language interfaces for Professional
BASIC, Turbo Pascal, Turbo C, Turbo C++, Borland C++, and Microsoft C for DOS; and Visual
Basic, Turbo Pascal, Microsoft C with SDK, and Borland C++ for Windows. NI-DAQ software
is on high-density 5.25 in. and 3.5 in. diskettes.

Chapter 1 Introduction
© National Instruments Corporation 1-3 AT-DIO-32F User Manual
Optional Software
This manual contains complete instructions for directly programming the AT-DIO-32F.
Normally, however, you should not need to read the low-level programming details in the user
manual because the NI-DAQ software package for controlling the AT-DIO-32F is included with
the board. Using NI-DAQ is quicker and easier than and as flexible as using the low-level
programming described in Chapter 4, Programming.
You can use the AT-DIO-32F with LabVIEW for Windows or LabWindows for DOS.
LabVIEW and LabWindows are innovative program development software packages for data
acquisition and control applications. LabVIEW uses graphical programming, whereas
LabWindows enhances Microsoft C and QuickBASIC. Both packages include extensive
libraries for data acquisition, instrument control, data analysis, and graphical data presentation.
Part numbers for these software packages are listed in the following table.
Software Part Number
LabVIEW for Windows
LabWindows
Standard package
Advanced Analysis Library
Standard package with the Advanced Analysis Library
776670-01
776473-01
776474-01
776475-01

Introduction Chapter 1
AT-DIO-32F User Manual 1-4 © National Instruments Corporation
Optional Equipment
Equipment Part Number
Signal Conditioning Accessories
Cable Adapter Board for Signal Conditioning:
SC-2052 and 50-conductor cable 0.5 m 776335-02
1.0 m 776335-12
Optically-Isolated Digital Input:
SC-2060 and 26-conductor cable 0.2 m 776336-00
0.4 m 776336-10
Optically-Isolated Digital Output:
SC-2061 and 26-conductor cable 0.2 m 776336-01
0.4 m 776336-11
Electromechanical Relay Digital Control:
SC-2062 and 26-conductor cable 0.2 m 776336-02
0.4 m 776336-12
General-Purpose Termination Breadboard:
SC-2072 with 50-conductor cable 0.5 m 776358-02
1.0 m 776358-12
Digital Signal Conditioning Modules:
SSR Series mounting rack and 1.0 m cable
32-channel 776290-32
24-channel 776290-24
16-channel 776290-16
8-channel 776290-08
CB-50 I/O connector block (50 screw terminals)
with 0.5 m type NB1 cable 776164-01
with 1.0 m type NB1 cable 776164-02
AT Series RTSI bus cables for
2 boards 776249-02
3 boards 776249-03
4 boards 776249-04
5 boards 776249-05
Standard ribbon cable 0.5 m 180524-05
1.0 m 180524-10
Shielded ribbon cable 0.5 m* 180554-05
1.0 m* 180554-10
Ribbon cable with edge connection at one end 0.5 m 180723-05
1.0 m 180723-10
* The AT-DIO-32F is equipped with an EMI shield on the I/O connector that can
be used to connect the shield of a shielded ribbon cable to the computer chassis.
Shielded ribbon cables are necessary to meet FCC Class A Emission Limits.

Chapter 1 Introduction
© National Instruments Corporation 1-5 AT-DIO-32F User Manual
Refer to the Cabling section in Chapter 2, Configuration and Installation, for additional
information on cabling and connectors.
Unpacking
Your AT-DIO-32F board is shipped in an antistatic plastic package to prevent electrostatic
damage to the board. Several components on the board can be damaged by electrostatic
discharge. To avoid such damage in handling the board, take the following precautions:
• Touch the plastic package to a metal part of your PC chassis before removing the board from
the package.
• Remove the board from the package and inspect the board for loose components or any other
sign of damage. Notify National Instruments if the board appears damaged in any way. Do
not install a damaged board into your computer.

© National Instruments Corporation 2-1 AT-DIO-32F User Manual
Chapter 2
Configuration and Installation
This chapter explains the installation of the AT-DIO-32F board into your computer, signal
connections to the AT-DIO-32F board, and cable wiring.
Board Configuration
The AT-DIO-32F contains three jumpers and one DIP switch to configure the AT bus interface
and board clock settings. The jumpers are shown in the parts locator diagram in Figure 2-1.
Jumper W3 selects the clock signal used by the board and the clock pin on the RTSI bus. Jumper
W1 selects the DMA channel, and jumper W2 selects the interrupt enable lines. The DIP switch
is used to set the base I/O address.
AT Bus Interface
The AT-DIO-32F is configured at the factory to use a base I/O address of hex 240, to use
interrupt lines 11 and 12, to use DMA channels 5 and 6, and to disconnect the board from the
RTSI clock. These settings (shown in Table 2-1) are suitable for most systems. However, if
your system has other hardware at this base I/O address, interrupt level, or DMA channel, you
need to change these settings on the AT-DIO-32F (as described in the following pages) or on the
other hardware. Record your settings in the AT-DIO-32F Hardware and Software Configuration
Form in Appendix E, Customer Communication.

Configuration and Installation Chapter 2
AT-DIO-32F User Manual 2-2 © National Instruments Corporation
Table 2-1. AT-DIO-32F Factory-Set Jumper and Switch Settings
Base I/O Address Hex 240 (factory setting) U61
A9
A8
A7
A6
A5
1
2
3
4
5
The black side indicates the
side that is pushed down.
DMA Channel Bank A = Channel 5
Bank B = Channel 6
(factory setting)
W1: Upper-right two rows
W1: Lower-middle two rows
Interrupt Level Lines 11 and 12 selected
(factory setting) W2: Row 4 from left W2: Row 3 from left
RTSI Clock Disconnect board from RTSI
clock; use onboard oscillator
(factory setting)
W3: STANDBY,
BRDCLK-OSC

Configuration and Installation Chapter 2
AT-DIO-32F User Manual 2-4 © National Instruments Corporation
Base I/O Address Selection
The base I/O address for the AT-DIO-32F is determined by the switches at position U61 (see
Figure 2-1). The switches are set at the factory for the base I/O address hex 240. This factory
setting is used as the default base I/O address value by National Instruments software packages
using the AT-DIO-32F. The AT-DIO-32F uses the base I/O address space hex 240 through 25F
with the factory setting.
Note: Verify that this space is not already used by other equipment installed in your
computer. If any equipment in your computer uses this base I/O address space, change
the base I/O address of the AT-DIO-32F or of the other device. If you change the AT-
DIO-32F base I/O address, make a corresponding change to any software packages
you use with the AT-DIO-32F. Table 2-2 lists the default settings of other National
Instruments products for the PC. For more information about the I/O address of your
PC, refer to the technical reference manual for your computer.