Making a Connection for 2-Wire 24 × 1 Multiplexer Topology
- Updated2025-01-23
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Making a Connection for 2-Wire 24 × 1 Multiplexer Topology
The module in this topology contains 24 2-wire input channels connected to a common 2-wire channel. In software, these input channels are referred to as ch<0..23> and the common channel is referred to as com0. All positive leads (CH0+ through CH23+) can connect to COM0+, and all negative leads (CH0– through CH23–) can connect to COM0–.
For example, to connect a 2-wire signal to ch5, wire the HI side to CH5+ and the LO side to CH5–. For com0, connect to COM0+ and COM0– for the HI and LO of the signal, respectively.
You can also route cjtemp to com0, which routes com0 to a temperature sensor on the NI TB-2605 terminal block. Refer to PXI-2503 Cold-Junction Temperature Sensor Channel for more information.
During scanning, an example scan list entry is CH2->com0;. This entry routes the signal connected to CH2+ to COM0+ and the signal connected to CH2– to COM0–.
During immediate operations when calling the niSwitch Connect Channels VI or the niSwitch_Connect function with ch2 and com0, the signal connected to CH2+ is routed to COM0+ and the signal connected to CH2– is routed to COM0–. To route the signals to AB0, use the niSwitch Connect Channels VI or the niSwitch_Connect function with com0 and ab0.
Related Information
- PXI-2503 Cold-Junction Temperature Sensor Channel
The module has a dedicated temperature sensor channel useful for cold-junction compensation when switching thermocouples.