Chapter 3
Connector and LED Information
X Series User Manual
3-2
ni.com
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 meas
u
rements in RSE mode and the bias
c
u
rrent ret
u
rn point for DIFF meas
u
rements. All three gro
u
nd
references—AI GND, AO GND, and D GND—are connected on
the device.
*
AI <0..31>
Varies
Inp
u
t
Analog Input Channels 0 to 31
(MIO X Series Devices)
For single-ended meas
u
rements, each
signal is an analog inp
u
t 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..31> signal is AI SENSE 2.
For differential meas
u
rements on MIO X Series devices, AI 0 and
AI 8 are the positive and negative inp
u
ts of differential analog
inp
u
t channel 0. Similarly, the following signal pairs also form
differential inp
u
t channels:
AI <1,9>, AI <2,10>, AI <3,11>, AI <4,12>, AI <5,13>,
AI <6,14>, AI <7,15>, AI <16,24>, AI <17,25>, AI <18,26>,
AI <19,27>, AI <20,28>, AI <21,29>, AI <22,30>, AI <23,31>
Also refer to the
Connecting Ground-Referenced Signal Sources
section of Chapter 4,
Analog Input
.
(Simultaneous MIO X Series Devices)
For differential
meas
u
rements on Sim
u
ltaneo
u
s MIO X Series devices, AI 0+ and
AI 0– are the positive and negative inp
u
ts of differential analog
inp
u
t channel 0.
Also refer to the
Connecting Analog Input Signals
section of
Chapter 4,
Analog Input
.
AI SENSE,
AI SENSE 2
—
Inp
u
t
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. Also refer to the
Connecting
Ground-Referenced Signal Sources
section of Chapter 4,
Analog
Input
.
AO <0..3>
AO GND
O
u
tp
u
t
Analog Output Channels 0 to 3
—These terminals s
u
pply the
voltage o
u
tp
u
t of AO channels 0 to 3.
AO GND
—
—
Analog Output Ground
—AO GND is the reference for
AO <0..3>. All three gro
u
nd references—AI GND, AO GND,
and D GND—are connected on the device.
*
D GND
—
—
Digital Ground
—D GND s
u
pplies the reference for P0.<0..31>,
PFI <0..15>/P1/P2, and +5 V. All three gro
u
nd
references—AI GND, AO GND, and D GND—are connected on
the device.
*
P0.<0..31>
D GND
Inp
u
t or
O
u
tp
u
t
Port 0 Digital I/O Channels 0 to 31
—Yo
u
can individ
u
ally
config
u
re each signal as an inp
u
t or o
u
tp
u
t.
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