NI PXI-2530 1-Wire 128×1 Multiplexer Topology

Use the NI TB-2630 terminal block with the NI PXI-2530 as a 1-wire 128×1 multiplexer. In this topology, all channel terminals (CH0 through CH127) route to COM0. A reference, 1WREF0, always remains connected to COM1. The pair, COM0 and COM1, is provided for convenient connectivity to a 2-wire device, such as a DMM.

The following figure represents the NI PXI-2530 in the 1-wire 128×1 multiplexer topology.

Making a Connection

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 connection:

signal connected to CH2 is routed to COM0

Signal Connections

Refer to the Signal Connections section for the NI PXI-2530 front connector pinout and NI TB-2630 terminal mapping.