Making a Connection for 2-Wire Quad 6 × 1 Multiplexer Topology
- Updated2025-01-23
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Making a Connection for 2-Wire Quad 6 × 1 Multiplexer Topology
The module in this topology contains four banks of six 2-wire input channels connected to a common 2-wire channel. These input channels are referred to as ch<0..23>, and the four common channels are referred to as com<0..3>. You can only connect to the common channel that is in the same bank. The banks are organized as shown in the following table.
Input Channels | Common Channel |
---|---|
ch0, ch1, ch2, ch3, ch4, ch5, cjtemp | com0 |
ch6, ch7, ch8, ch9, ch10, ch11 | com1 |
ch12, ch13, ch14, ch15, ch16, ch17 | com2 |
ch18, ch19, ch20, ch21, ch22, ch23 | com3 |
For example, you can connect ch5 to com0; however, you cannot connect ch5 to com1 in this topology. When connecting signals for ch5, you would connect them to CH5+ and CH5– for HI and LO of the signal, respectively. For com0, connect to COM0+ and COM0– for HI and LO of the signal, respectively.
Notice that in the first bank you can connect cjtemp to com0. This connects 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– is routed 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+. To route the signals to ABO, use the niSwitch Connect Channels VI or the niSwitch_Connect function with com0 and ab0 and the signal connected to CH2– is routed to COM0–.
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.