Appendix A Connecting I/O Signals
© National Instruments Corporation A-5 R Series Intelligent DAQ User Manual

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

on the NI 78xxR can damage the NI 78xxR and the computer. Maximum input ratings for each signal are in the Protection column of TableA-2. NI is not liable for any damage resulting from such signal connections

Table A-2. NI78xx R I/O Signal Summary

Signal Name
Signal
Type and
Direction
Impedance
Input/
Output
Protection
(Volts)
On/Off
Source
(mA at V)
Sink
(mA atV) Rise Time Bias
+5V DO — — — — — —
Analog Signals (NI 783xR/784xR/785xR Only)
AI<0..7>+ AI 10 GΩ in
parallel with
100pF
42/35 — — — ±2nA
AI<0..7>– AI 10 GΩ in
parallel with
100pF
42/35 — — — ±2nA
AIGND AO — — — — — —
AISENSE AI 10 GΩ in
parallel with
100pF
42/35 — — — ±2nA
AO<0..7> AO 1.25ΩShort
circuit to
ground
2.5 at 10 2.5 at –10 10 V/μs —
AOGND AO — — — — — —
Digital Signals (All NI 78xxR Devices) — — — —
DIO<0..39>
Connector<0..3>
(NI781xR)
DIO<0..15>
Connector 0
(NI783xR,
NI784xR, and
NI785xR)
DIO<0..39>
Connector <1..2>
(NI783xR,
NI784xR, and
NI785xR)
DIO —–0.5 to+7.0
(NI783xR)
–20 to 20
(NI784xR/
NI785xR)
4.0 at 2.4 4.0 at 0.4 — —
AI = Analog Input AO = Analog Output DIO = Digital Input/Output DO = Digital Output