
Chapter 15 VXI-DAQ Devices
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National Instruments Corporation 15-3 DAQ Hardware Overview Guide
values for all the analog output channels. All analog channels are
guaranteed to be at their power-on values 5 ms after deassertion of system
reset.
VXI-AO-48XDC Digital I/O
The VXI-AO-48XDC contains 32 lines of digital I/O. These lines are
divided into four ports of 8 lines each. These four ports are referred to as
ports 0 through 3 by the digital I/O functions. You can program each of
these ports on a line basis; you can configure each line individually for
input or output. In addition, each line that you configure as an output line
has read-back capability (that is, by reading the port associated with a
particular line, you can determine what digital value the output line is
currently asserting). These digital I/O ports operate only in nonlatched
mode.
VXI-MIO-64E-1 and VXI-MIO-64XE-10
Multifunction VXIbus Devices
The VXI-MIO Series includes the following modules:
• VXI-MIO-64E-1
• VXI-MIO-64XE-10
The VXI-MIO Series modules are high-performance multifunction analog,
digital, and timing I/O modules for VXIbus.
This family of modules features 12-bit and 16-bit ADCs with 64 analog
inputs, 12-bit and 16-bit DACs with voltage outputs, eight lines of
TTL-compatible digital I/O, and two 24-bit counter/timers for timing I/O.
The VXI-MIO Series modules use the National Instruments DAQ-STC
system timing controller for timer-related functions. The DAQ-STC
consists of three timing groups that control analog input, analog output, and
general-purpose counter/timer functions. These groups include a total of
seven 24-bit and three 16-bit counters and a maximum timing resolution of
50 ns.
A common problem with other VXI modules is that you cannot easily
synchronize several measurement functions to a common trigger or timing
event. The VXI-MIO Series modules solve this problem by using VXIbus
triggers to synchronize measurements on several VXI-MIO Series
modules.
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