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Connections that exceed any of the maximum ratings of input or output signals
Caution
on the NI 78xxR can damage the NI 78xxR and the computer. Maximum input ratings for
each signal are in the Protection column of Table A-2. NI is not liable for any damage
resulting from such signal connections
Signal
Type and
Signal Name
Direction
+5V
DO
Analog Signals (NI 783xR/784xR/785xR Only)
AI<0..7>+
AI<0..7>–
AIGND
AISENSE
AO<0..7>
AOGND
Digital Signals (All NI 78xxR Devices)
DIO<0..39>
DIO
Connector<0..3>
(NI 781xR)
DIO<0..15>
Connector 0
(NI 783xR,
NI 784xR, and
NI 785xR)
DIO<0..39>
Connector <1..2>
(NI 783xR,
NI 784xR, and
NI 785xR)
AI = Analog Input
AO = Analog Output
© National Instruments Corporation
Table A-2. NI 78xxR I/O Signal Summary
Impedance
Input/
Output
—
AI
10 GΩ in
parallel with
100 pF
AI
10 GΩ in
parallel with
100 pF
AO
—
AI
10 GΩ in
parallel with
100 pF
1.25 Ω
AO
AO
—
—
–0.5 to +7.0
(NI 783xR)
–20 to 20
(NI 784xR/
NI 785xR)
DIO = Digital Input/Output
Protection
(Volts)
Source
On/Off
(mA at V)
—
—
42/35
—
42/35
—
—
—
42/35
—
Short
2.5 at 10
circuit to
ground
—
—
—
4.0 at 2.4
DO = Digital Output
A-5
Appendix A
Connecting I/O Signals
Sink
(mA at V)
Rise Time
—
—
—
—
—
—
—
—
—
—
2.5 at –10
10 V/μs
—
—
—
—
4.0 at 0.4
—
R Series Intelligent DAQ User Manual
Bias
—
±2 nA
±2 nA
—
±2 nA
—
—
—
—
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