National Instruments PCI-6281

3-2 | ni.com
Chapter 3 Connector and LED Information
Table 3-1. I/O Connector Signals
Signal Name Reference Direction Description
AI GND — — Analog Input Ground—These terminals are the
reference point for single-ended AI measurements
in RSE mode and the bias current return point for
DIFF measurements. All three ground
references—AI GND, AO GND, and
D GND—are connected on the device. Refer to
the
Connecting Analog Input Signals section of
Chapter 4,
Analog Input.
AI <0..79> Var ie s Input Analog Input Channels—For single-ended
measurements, each signal is an analog input
voltage channel. In RSE mode, AI GND is the
reference for these signals. In NRSE mode, the
reference for each AI <0..15> signal is
AI SENSE; the reference for each AI <16..63>
and AI <64..79> signal is AI SENSE 2
*
.
For differential measurements, AI 0 and AI 8 are
the positive and negative inputs of differential
analog input channel 0. Similarly, the following
signal pairs also form differential input channels:
<AI 1, AI 9>, <AI 2, AI 10>, <AI 3, AI 11>, and
so on.
Refer to the
Connecting Analog Input Signals
section of Chapter 4, Analog Input.
AI SENSE,
AI SENSE 2
— Input Analog Input Sense—In NRSE mode, the
reference for each AI <0..15> signal is
AI SENSE; the reference for each AI <16..63>
and AI <64..79> signal is AI SENSE 2
*
. Refer to
the
Connecting Analog Input Signals section of
Chapter 4,
Analog Input.
AO <0..3> AO GND Output Analog Output Channels—These terminals
supply the voltage output. Refer to the
Connecting
Analog Output Signals
section of Chapter 5,
Analog Output.
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. Refer to
the
Connecting Analog Output Signals section of
Chapter 5, Analog Output.