Keithley KUSB-3100, User Manual

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Principles of Operation
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Digital I/O Features
This section describes the following features of digital I/O
operations:
• Digital I/O lines, described on this page;
• Resolution, described on page 23 , and
• Operation modes, described on page 24 .
Digital I/O Lines
The KUSB-3100 module provides 8 dedicated digital input lines and 8
dedicated digital output lines.
Using DT-Open Layers, you can specify the digital line that you want
to read or write in a single-value digital I/O operation. Refer to
page
24 for more information about single-value operations.
A digital line is high if its value is 1; a digital line is low if its value is
0. On power up or reset, a low value (0) is output from each of the
digital output lines.
Note: You can also read or write to the digital I/O lines using direct
register calls. Refer to Appendix C for more information on these
calls.
Resolution
The resolution of the digital ports on the KUSB-3100 module is fixed
at 8-bits.