NI SCXI-1130 1-Wire 256×1 Multiplexer Topology

Use the NI SCXI-1377 terminal block with the NI SCXI-1130 as a 1-wire 256×1 multiplexer. In this topology, channel terminals CH 00 through CH 255 route to OUT0. A reference, 1WREF0, always remains connected to OUT1, which is addressed as com0 in software. The pair, OUT0 and OUT1, is provided for convenient connectivity to a 2-wire device, such as a DMM.

The following figure represents the NI SCXI-1130 in the 1-wire 256×1 multiplexer topology.

Making a Connection

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

CH 02 connected to OUT0

Signal Connections

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