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Chapter 5 Theory of Operation
© National Instruments Corporation 5-5 PC-OPDIO-16 User Manual
Using LabVIEW Data Acquisition Library for Digital I/O
LabVIEW users are encouraged to use the Easy I/O VIs in LabVIEW. They allow full access to
the PC-OPDIO-16 board functionality. For specific information on the VIs and how to write
LabVIEW data acquisition applications refer to your LabVIEW Data Acquisition VI Reference
Manual for Windows. The PC-OPDIO-16 board may not be specifically mentioned in your
version of the LabVIEW manuals.
The easiest way to use digital input and output in LabVIEW is to call the Easy I/O VIs Read
from Digital Line, Read from Digital Port, Write to Digital Line, or Write to Digital Port.
Note that configuring a port will cause the output of the other port to change to zero. The Easy
I/O VIs will configure the port in some cases.
You can also call the Advanced Digital I/O VIs DIO Port Read, DIO Port Write, and DIO Single
Read/Write to input and output digital data from the ports.
The following digital input and output LabVIEW VIs are supported for the PC-OPDIO-16 board.
Easy I/O VIs
• Read from Digital Port
• Read from Digital Line
• Write to Digital Port
• Write to Digital Line
Advanced VIs
• DIO Single Read/Write
• DIO Port Write
• DIO Port Read