National Instruments AT-MIO-16X - Manual (Page 164)

Chapter 4 Register Map and Descriptions
AT-MIO-16X User Manual 4-68 © National Instruments Corporation
Digital I/O Register Group
The two registers making up the Digital I/O Register Group monitor and
control the AT-MIO-16X digital I/O lines. The Digital Input Register
returns the digital state of the eight digital I/O lines. A pattern written
to the Digital Output Register is driven onto the digital I/O lines when
the digital output drivers are enabled (see the description for Command
Register 2).
Bit descriptions of the two registers making up the Digital I/O Register
Group are given on the following pages.