[Al Skierkiewicz]

It is not really a "balanced" signal but it is a transmission line. You will need CAN enabled if you wish to use the pneumatics PCM module and turn on your compressor. As always, CAN implementation requires a terminating resistor at each end of the buss. One is provided in the RoboRio (The start of the buss) and another is provided in the PDP (possible end of the buss). If you wish to configure your CAN wiring differently or not use the PDP CAN, then be sure to provide the required termination resistor at the last device in your chain. The majority of CAN problems in the past have centered around the termination resistor.