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Appendix A Connecting I/O Signals Multifunction Reconfigur able I/O User Manual A-6 ni.com Connecting to 5B and SSR Analog Signal Conditioning (NI 783 x /784 x /785 x Only) NI provides cables that allo w yo u to connect …

Appendix A Connecting I/O Signals

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

on the NI 78xx can damage the NI 78xx 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

Table A-2. NI 78xx I/O Signal Summary

Signal Name

Signal

Type and

Direction

Impedance

Input/

Output

Protection

(Volts)

On/Off

Source

(mA at V)

Sink

(mA at V)

Rise Time Bias

+5V DO — — — — — —

Analog Signals (NI 783x/784x/785x Only)

AI<0..7>+ AI 10 GΩ in

parallel with

100 pF

42/35 — — — ±2 nA

AI<0..7>– AI 10 GΩ in

parallel with

100 pF

42/35 — — — ±2 nA

AIGND AO — — — — — —

AISENSE AI 10 GΩ in

parallel with

100 pF

42/35 — — — ±2 nA

AO<0..7> AO 1.25 Ω Short

circuit to

ground

2.5 at 10 2.5 at –10 10 V/μs —

AOGND AO — — — — — —

Digital Signals (All NI 78xx Devices) — — — —

DIO<0..39>

Connector <0..3>

(NI 781x)

DIO<0..15>

Connector 0

(NI 783x,

NI 784x, and

NI 785x)

DIO<0..39>

Connector <1..2>

(NI 783x,

NI 784x, and

NI 785x)

DIO — –0.5 to +7.0

(NI 783x)

–20 to 20

(NI 784x/

NI 785x)

4.0 at 2.4 4.0 at 0.4 — —

AI = Analog Input AO = Analog Output DIO = Digital Input/Output DO = Digital Output

Appendix A Connecting I/O Signals

Multifunction Reconfigurable I/O User Manual A-6 ni.com

Connecting to 5B and SSR Analog Signal Conditioning

(NI 783x /784x /785x Only)

NI provides cables that allow you to connect signals from the

NI 783x/784x/785x directly to 5B backplanes for analog signal

conditioning and SSR backplanes for digital signal conditioning.

The NSC68-262650 cable connects the signals on the NI 783x/784x/785x

RMIO connector directly to 5B and SSR backplanes. This cable has a

68-pin male VHDCI connector on one end that plugs into the

NI 783x/784x/785x RMIO connector. The other end of this cable provides

two 26-pin female headers plus one 50-pin female header.

One of the 26-pin headers contains all the NI 783x/784x/785x analog input

signals. You can plug this connector directly into a 5B backplane for analog

input signal conditioning. The NI 783x/784x/785x AI<0..n> correspond to

the 5B backplane channels <0..n> in sequential order. Configure the AI

channels to use the NRSE input mode when using 5B signal conditioning.

The other 26-pin header contains all the NI 783x/784x/785x analog output

signals. You can plug this connector directly into a 5B backplane for AO

signal conditioning. The NI 783x/784x/785x AO<0..n> correspond to the

5B backplane channels <0..n> in sequential order.

The 50-pin header contains the 16 DIO lines available on the

NI 783x/784x/785x RMIO connector. You can plug this header directly into

an SSR backplane for digital signal conditioning. DIO lines <0..15>

correspond to the 5B backplane Slots <0..15> in sequential order.

The 5B connector pinouts are compatible with 8-channel 5B08 backplanes

and 16-channel 5B01 backplanes. The NI 7830 can accept analog

input from the first four channels of a 16-channel backplane.

The NI 7831/7833/784x/785x can accept analog input from the

first eight channels of a 16-channel backplane. The SSR connector pinout

is compatible with 8-, 16-, 24-, and 32-channel SSR backplanes. You can

connect to an SSR backplane containing a number of channels unequal to

the 16 DIO lines available on the 50-pin header. In this case, you have

access to only the channels that exist on both the SSR backplane and the

NSC68-262650 cable 50-pin header.

Appendix A Connecting I/O Signals

Figure A-3 shows the connector pinouts when using the NSC68-262650

cable.

Figure A-3. Connector Pinouts when Using NSC68-262650 Cable

Connecting to SSR Digital Signal Conditioning

NI provides cables that allow you to connect signals from the NI 78xx

directly to SSR backplanes for digital signal conditioning.

The NSC68-5050 cable connects the signals on the NI 78xx RDIO

connectors directly to SSR backplanes for digital signal conditioning. This

cable has a 68-pin male VHDCI connector on one end that plugs into the

NI 78xx RDIO connectors. The other end of this cable provides

two 50-pin female headers.

AO0

AOGND0

AO1

AO2

AOGND2

AO3

AO4

AOGND4

AO5

AO6

AOGND6

AO7

Connect

AOGND1

Connect

AOGND3

Connect

AOGND5

Connect

AOGND7

Connect

AI0+

AIGND0

AI1+

AI2+

AIGND2

AI3+

AI4+

AIGND4

AI5+

AI6+

AIGND6

AI7+

AISENSE

AI0–

AI1–

AIGND1

AI2–

AI3–

AIGND3

AI4–

AI5–

AIGND5

AI6–

AI7–

AIGND7

Connect

AI 0–7 Connector

Pin Assignment

Connect

DIO15

DIO14

DIO13

DIO12

DIO11

DIO10

DIO9

DIO8

DIO7

DIO6

DIO5

DIO4

DIO3

DIO2

DIO1

DIO0

+5V

Connect

DGND

DIO 0–15 Connector

Pin Assignment

AO 0–7 Connector

Pin Assignment