Appendix B Connecting I/O Signals
NI PXI-7831R User Manual B-4 ni.com
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Caution Connections that exceed any of the maximum ratings of input or output signals

on the NI PXI-7831R can damage the NI PXI-7831R and the computer. Maximum input ratings for each signal are given in the Protection column of TableB-2. NI is not liable for any damage resulting from such signal connections

Table B-1. I/O Connector Signal Descriptions

Signal Name Reference Direction Description
+5V DGND Output +5 VDC Source—These pins supply +5V from the computer
power supply using a self-resetting 1A fuse. No more than
250mA should be pulled from a single pin.
AI<0..7>+ AIGND Input Positive Input for Analog Channels 0 through 7.
AI<0..7>– AIGND Input Negative Input for Analog Channels 0 through 7.
AIGND — — Analog Input Ground—These pins are the reference point for
single-ended measurements in RSE configuration and the
bias current return point for differential measurements.
Allthree ground references—AIGND, AOGND, and
DGND—are connected together on the NIPXI-7831R.
AISENSE AIGND Input Analog Input Sense—This pin serves as the reference node
for channels AI<0..7> when the device is configured for
NRSE mode.
AO<0..7> AOGND Output Analog Output Channels 0 through 7. Each channel can
source or sink up to 5mA.
AOGND — — Analog Output Ground—The analog output voltages
arereferenced to this node. All three ground
references—AIGND, AOGND, and DGND—are
connectedtogether on the NI PXI-7831R.
DGND — — Digital Ground—These pins supply the reference for the
digital signals at the I/O connector as well as the +5V supply.
All three ground references—AIGND, AOGND, and
DGND—are connected together on the NI PXI-7831R.
DIO<0..15>
Connector 0
DIO<0..39>
Connector<1..2>
DGND Input or
Output
Digital I/O signals.