National Instruments Multifunction RIO NI R Series, User Manual

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Appendix A Connecting I/O Signals
R Series Multifunction RIO User Manual A-4 ni.com
To access the signals on the I/O connectors, yo
u
m
u
st connect a cable from
the I/O connector to a signal accessory. Pl
u
g the small VHDCI connector
end of the cable into the appropriate I/O connector and connect the other
end of the cable to the appropriate signal accessory.
Table A-1. I/O Connector Signal Descriptions
Signal Name Reference Direction Description
+5V DGND O
u
tp
u
t +5 VDC So
u
rce—These pins s
u
pply 5 V from the comp
u
ter
power s
u
pply. For more information on the +5V terminals,
refer to the +5 V Power Source section in Chapter 2,
Hardware Overview of the NI 78xxR .
Analog Signals (NI 783
x
R/784
x
R/785
x
R Only)
AI<0..7>+ AIGND Inp
u
t Positive inp
u
t for Analog Inp
u
t channels 0 thro
u
gh 7.
AI<0..7>– AIGND Inp
u
t Negative inp
u
t for Analog Inp
u
t channels 0 thro
u
gh 7.
AIGND — — Analog Inp
u
t Gro
u
nd—These pins are the reference point
for single-ended meas
u
rements in RSE config
u
ration and
the bias c
u
rrent ret
u
rn point for differential meas
u
rements.
All three gro
u
nd references—AIGND, AOGND, and
DGND—are connected to each other on the
NI 783
x R/784 x R/785 x R.
AISENSE AIGND Inp
u
t Analog Inp
u
t Sense—This pin serves as the reference node
for AI <0..7> when the device is config
u
red for NRSE mode.
AO<0..7> AOGND O
u
tp
u
t Analog O
u
tp
u
t channels 0 thro
u
gh 7. Each channel can
so
u
rce or sink
u
p to 2.5 mA.
AOGND — — Analog O
u
tp
u
t Gro
u
nd—The analog o
u
tp
u
t voltages
are referenced to this node. All three gro
u
nd
references—AIGND, AOGND, and DGND—are
connected to each other on the NI 783
x R/784 x R/785 x R.
Digital Signals (All NI 78
xx
R Devices)
DGND — — Digital Gro
u
nd—These pins s
u
pply the reference for the
digital signals at the I/O connector and the 5 V s
u
pply.
All three gro
u
nd references—AIGND, AOGND, and
DGND—are connected to each other on the
NI 783
x R/784 x R/785 x R.
DIO<0..39>
Connector <0..3>
(NI 781
x R)
DIO<0..15>
Connector 0
(NI 783
x R/784 x R/785 x R)
DIO<0..39>
Connector <1..2>
(NI 783
x R/784 x R/785 x R)
DGND Inp
u
t or
O
u
tp
u
t
Digital I/O signals.