I'm planning to route all 16 channels from a PXI-8430/16 to a "custom comm. box" where some will be broken out level shifted and modulated for OOK (100kHz) communication and others will just be passed through to other RS-232 equipment (600 to 9600 baud). My question concerns the connection between the PXI-8430 and the "custom comm. box".
I want to avoid using the 68-pin VHDCI to nine DB-9 octopus cables and am considering a pair of the SHC68-C68-S, 68-pin VHDCI to 68-pin VHDCI cables, either 186380-02 (2 meter) or 186380-0R5 (0.5 meter) or one of the 186381 D-Type alternates.
I haven’t looked at the design of these cables but I’m assuming they are single bundle with one overall shield?
The system I inherited had issues with crosstalk due to haphazard bundling of multiple OOK (100kHz) channels. Are there limitations or concerns with bundeling 8 RS-232 channels in these NI cables?
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If Crosstalk is an issue I would not recomend the SHC68-C68S. The calbe design is just a bit different than 1 overall shield It uses 34 twisted pairs. From looking at the Docs HERE and Here. You'ld be twisting each line of port 1-4 with its corresponding port 5-8 signal line. just about garunteeing crosstalk.