© National Instruments
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3-3
AI SENSE,
AI SENSE 2,
AI SENSE 3,
AI SENSE 4
—
Input
Analog Input Sense
—In NRSE mode, the reference
for each AI <0..15> signal is AI SENSE; the
reference for each AI <16..31> signal is
AI SENSE 2; the reference for each AI <80..143> is
AI SENSE 3; and the reference for each
AI <144..207> is AI SENSE 4. Also refer to the
Connecting Ground-Referenced Signal Sources
section of Chapter 4,
.
AO <0..3>
AO GND
Output
Analog Output Channels 0 to 3
—These terminals
supply the voltage output of AO channels 0 to 3.
AO GND
—
—
Analog Output Ground
—AO GND is the
reference for AO <0..3>. All three ground
references—AI GND, AO GND, and D GND—are
connected on the device.
*
D GND
—
—
Digital Ground
—D GND supplies the reference for
P0.<0..31>, PFI <0..15>/P1/P2, and +5 V. All three
ground references—AI GND, AO GND, and
D GND—are connected on the device.
*
P0.<0..31>
D GND
Input or
Output
Port 0 Digital I/O Channels 0 to 31
—You can
individually configure each signal as an input or
output.
APFI <0,1>
AO GND
or AI GND
Input
Analog Programmable Function Interface
Channels 0 to 1
—Each APFI signal can be used as
AO external reference inputs for AO <0..3>, or as an
analog trigger input. APFI <0,1> are referenced to
AI GND when they are used as analog trigger inputs.
APFI <0,1> are referenced to AO GND when they
are used as AO external offset or reference inputs.
These functions are not available on all devices.
Refer to the device specifications.
+5 V
D GND
Output
+5 V Power Source
—These terminals provide a
fused +5 V power source. Refer to the
section for more information.
Table 3-1.
I/O Connector Signals (Continued)
Signal Name
Reference
Direction
Description
Summary of Contents for DAQ X NI 634 Series
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