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Why are there 4 Column Terminals Per Column for the Pinout on the PXI-2501/2503 in the 2-Wire 4X6 Matrix Topology

Hardware: Switches>>Multiplexer/Matrix>>PXI-2503

Problem:
I am using the SH-68-68S cable with the TBX-68S and am unsure of which column terminal to connect. The pinout for the PXI-2501/2503 has 4 column terminals for each column when looking at the 2-wire 4X6 matrix topology.

Solution:
To have the board work as a matrix, you need the TB-2606 terminal block, or you can tie all of the Column + terminals and the Column - terminals together. With the TBX-68S the columns connect in the following fashion:

• The pins for C0+ are 33, 25, 16, and 6 and the pins for C0- are 67, 59, 50, and 40.
• If you connect R0 (61, 27) to C0, it will close the pins 61 and 33 for the positive leads, and 27 and 67 for the negative leads.
  
• If you choose to connect R1 (60, 26) to C0, it will close the pins 60 and 25 for the positive leads, and 26 and 59 for the negative leads.
  

In summary, there is only one path per column pin and each row pin connects to a different set of column pins.

You can view the pinout and matrix configuration in the NI Switches Help installed with NI-Switch:
Start»All Programs»National Instruments»NI-SWITCH»Documentation»NI Switches Help

This help file can also be downloaded separately by clicking on the NI Switches Help link below.

Related Links:
Product Manuals: TB-2606 Terminal Block Installation Guide
Product Manuals: NI Switches Help


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Report Date: 10/20/2003
Last Updated: 10/20/2008
Document ID: 32JEN4A2

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