Cable selection for PXIe-8431/16 (RS-422)

[Raisintoe]

Hello,

I am having trouble finding a compatible twisted-shielded RS-422 cable for the PXIe-8431/16 with the VHDCI connection. I have located a few twisted-shielded cables from NI, but the twisted pair does not match the pinout of the PXIe-8431/16. The NI product search is not bringing up more than one cable option for a twisted shielded VHDCI cable, and I know NI has more than this.

I have no requirement for the other end of the cable, though keeping it smaller would be nice.

[santo_13]

here are the part numbers for supported cables for 8431 (you can find it here - https://www.ni.com/pdf/manuals/373170f.pdf pg.12)

Looks like RS-485 cable is used for RS-422 too - you can buy it here http://www.ni.com/en-us/shop/select/serial-cable?skuId=28060

Note - do verify the part number before placing an order

[Raisintoe]

Thank you Santo. I was hoping to get a single connector on the other end, but I guess that is not an option for 68-pin RS-422/485?

[santo_13]

Unfortunately does not seem to be the case, you can of course use a generic VHDCI - VHDCI cable but it may* not have any twisted pairs that NI have followed in these specific cabless for RS-232/RS-485/RS-422 (you can refer to the construction of these cables in the manuals/documents section of the particular cable)

I would recommend going with the official cables or you might have to deal with signal integrity issues (if those are a concern) that comes with generic VHDCI-VHDCI cable.

[ic1127]

We used the 540205040140 cable from Virginia Panel Corporation.  It goes to a PXI Receiver type interface, which goes to a mass interconnect assy on our design.  Check it out, on their website (VPC), they have the schematics.