[Qbranch]

I would suggest that you still put your ground wire for the PWM signal in your DB9 cable.... using common point grounding for signals like that when you have noisy compressors and motors usually introduces their noise into your small 5VDC signals that can cause wierd and hard to troubleshoot control problems.

Still, this would get you 8PWM sigals and one ground per cable for the Victor drives. Very interesting....

Did you also consider using CAT5 (Ethernet) cable? The RJ series connectors are quicker to disconnect/connect and are just as secure as the DB9 cables... but its pretty much a draw for which is better.

It'll be interesting to see how this turns out....

-q