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National Instruments Corporation vii PC-DIO-24/PnP User Manual
Mode 1—Strobed Input..................................................................................C-11
Mode 1 Input Programming Example..............................................C-13
Mode 1—Strobed Output ...............................................................................C-14
Mode 1 Output Programming Example...........................................C-16
Mode 2—Bidirectional Bus............................................................................C-17
Mode 2 Programming Example.......................................................C-19
Interrupt Programming Examples for the 82C55A ........................................C-20
Interrupt Handling.........................................................................................................C-22
Appendix D
Register-Level Programming
Differences between the PC-DIO-24PnP and the PC-DIO-24.....................................D-1
Configuration................................................................................................................D-2
Base I/O Address Settings..............................................................................D-3
Interrupt Selection ..........................................................................................D-5
Interrupt Enable Settings..................................................................D-6
Interrupt Level Settings....................................................................D-6
Installation ....................................................................................................................D-7
Appendix E
Customer Communication
Glossary
Index
Figures
Figure 1-1. The Relationship between the Programming Environment,
NI-DAQ, and Your Hardware ...............................................................1-4
Figure 2-1. Jumper W1 Location..............................................................................2-1
Figure 3-1. Digital I/O Connector Pin Assignments ................................................3-2
Figure 3-2. Digital I/O Connections.........................................................................3-6
Figure 3-3. DIO Channel Configured for High DIO Power-up State
with External Load.................................................................................3-8
Figure 3-4. DIO Channel Configured for Low DIO Power-up State
with External Load.................................................................................3-9
Figure 3-5. Mode 1 Timing Specification for Input Transfers.................................3-12
Figure 3-6. Mode 1 Timing Specification for Output Transfers ..............................3-13