RoboRIO unable to detect Jaguars wired through CAN

[ozrien]

So I tried a fresh setup with a RIO, out-of-box Jag, and a PDP. Seemed to work.

I took a single RJ11 cable (2 wire red/green) and snipped it in two. Giving me two harnesses each with a RJ11 end and two bare wires (red and green).

One harness connects RIO(Red/green) to Jag(rj11) and the other harness connects Jag(rj11) to PDP(green/red).

What's tricky is that red and green are flipped between the two rj11s. As a result red/green is CANH/CANL on one and red/green is CANL/CANH on the other. The attached image better explains this.

So if you're cutting regular rj11 cables in half, be aware that the colors are not consistent on both sides of the Jag bus.