Table b-1. i/o connector signal descriptions – National Instruments NI 7831R User Manual

Page 56

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Appendix B

Connecting I/O Signals

© National Instruments Corporation

B-3

NI 7831R User Manual

.

Caution

Connections that exceed any of the maximum ratings of input or output signals

on the NI 7831R can damage the NI 7831R and the computer. Maximum input ratings for
each signal are in the Protection column of Table B-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 5 V from the computer
power supply using a self-resetting 1 A fuse. No more than
250 mA should be pulled from a single pin.

AI<0..7>+

AIGND

Input

Positive input for Analog Input channels 0 through 7.

AI<0..7>–

AIGND

Input

Negative input for Analog Input 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.
All three ground references—AIGND, AOGND, and
DGND—are connected to each other on the NI 7831R.

AISENSE

AIGND

Input

Analog Input Sense—This pin serves as the reference node
for 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 2.5 mA.

AOGND

Analog Output Ground—The analog output voltages
are referenced to this node. All three ground
references—AIGND, AOGND, and DGND—are
connected to each other on the NI 7831R.

DGND

Digital Ground—These pins supply the reference for the
digital signals at the I/O connector and the 5 V supply.
All three ground references—AIGND, AOGND, and
DGND—are connected to each other on the NI 7831R.

DIO<0..15>
Connector 0

DIO<0..39>
Connector <1..2>

DGND

Input or

Output

Digital I/O signals.

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