Signal Connections
Chapter 3
SCXI-1124 User Manual
3-4
© National Instruments Corporation
Front Connector Signal Descriptions
Pin
Signal Name
Description
A30, A26, A22,
SUPPLY<0..5>
Loop Supply–These pins are the
A18, A14, A10
isolated loop supplies that provide
power for 0 to 20mA applications.
B30, B26, B22
ISINK<0..5>
Current Sink–These pins are the
B18, B14, B10
programmable 0 to 20 mA current
sinks.
A29, A25, A21
VOUT<0..5>
Voltage output–These pins are the
A17, A13, A9
programmable voltage outputs,
referenced to the channel GND pin.
B29, B25, B21,
GND<0..5>
Isolated Ground Reference–These
B17, B13, B9
pins are the ground reference for the
voltage output and the loop supply.
C1
CHASSIS GND
Chassis Ground–This pin provides
a ground reference for floating
signals. It is not a safety earth
ground.
All other pins are not connected.
Analog Output Channel Signal Connections
You can connect each SCXI-1124 output channel independently for voltage output or current
output. Each channel is referenced to its own isolated ground. Each isolated ground can have up
to 250 Vrms of common-mode voltage between itself and any other channel ground or chassis
ground. The following illustrations show how to make different types of signal connections.
The large dots in the figures indicate where you connect wires to the SCXI-1325 terminal block.
For information on how to connect the wires to your terminal block, consult the SCXI-1325
High-Voltage Terminal Block Installation Guide.
