NI SCXI-1130 2-Wire Quad 32×1 Multiplexer Topology

Use the NI SCXI-1377 terminal block with the NI SCXI-1130 as a 2-wire quad 32×1 multiplexer. The following figure represents the NI SCXI-1130 in the 2-wire quad 32×1 multiplexer topology.

Making a Connection

In 2-wire mode, channel terminals CH 00 through CH 31 each have two differential leads. Each signal pair is routed through the NI SCXI-1130 and is available on the OUT0 and OUT1 screw terminals on the NI SCXI-1377. The OUT0 and OUT1 pair is addressed collectively as com0 in software. The other three banks follow a similar routing scheme.

Both the scanning command, ch2->com0;, and the immediate operation niSwitch Connect Channels VI or the niSwitch_Connect function with parameters ch2 and com0, result in the following connections:

signal connected to CH 02 is routed to OUT0

signal connected to CH 18 is routed to OUT1

Signal Connections

Refer to the Signal Connections section for the NI SCXI-1130 front connector pinout and NI SCXI-1377 terminal mapping.