National Instruments PC-DIO-24 - Manual (Page 6)

© National Instruments Corporation vii PC-DIO-24 User Manual
Contents
About This Manual ............................................................................................................. xi
Organization of This Manual ......................................................................................... xi
Conventions Used in This Manual ................................................................................. xii
National Instruments Documentation ............................................................................ xii
Related Documentation .................................................................................................. xiii
Customer Communication ............................................................................................. xiii
Chapter 1
Introduction
.......................................................................................................................... 1-1
About the PC-DIO-24 .................................................................................................... 1-1
What You Need to Get Started ...................................................................................... 1-2
Software Programming Choices .................................................................................... 1-2
LabVIEW and LabWindows/CVI Application Software .................................. 1-2
NI-DAQ Driver Software................................................................................... 1-3
Register-Level Programming ............................................................................. 1-4
Optional Equipment ....................................................................................................... 1-4
Custom Cables ................................................................................................... 1-4
Unpacking ...................................................................................................................... 1-6
Chapter 2
Configuration and Installation
...................................................................................... 2-1
Board Configuration ...................................................................................................... 2-1
Base I/O Address Settings.................................................................................. 2-2
Interrupt Selection .............................................................................................. 2-4
Interrupt Enable Settings........................................................................ 2-4
Interrupt Level Settings.......................................................................... 2-4
Installation...................................................................................................................... 2-5
Signal Connections ........................................................................................................ 2-6
I/O Connector Pin Description........................................................................... 2-6
Signal Connection Descriptions ......................................................................... 2-7
Port C Pin Assignments ......................................................................... 2-7
Timing Specifications ........................................................................................ 2-8
Mode 1 Input Timing ............................................................................. 2-9
Mode 1 Output Timing .......................................................................... 2-10
Mode 2 Bidirectional Timing................................................................. 2-11
Chapter 3
Theory of Operation
.......................................................................................................... 3-1
Address Decoder ............................................................................................................ 3-2
Bus Transceivers ............................................................................................................ 3-2
PC I/O Channel Control Circuitry ................................................................................. 3-2
82C55A Programmable Peripheral Interface ................................................................ 3-2
Interrupt Control Circuitry ............................................................................................. 3-2
Digital I/O Connector..................................................................................................... 3-2