Can wiring and the Phoenix Tuner

Hey, so the programming team has been trying this problem with the CAN when updating the talon SRX’s. So when the robot is on, all talon lights are yellow and everything is good, showing that the CAN wiring is fine. But then we go into Phoenix Tuner, and even though we are connected via USB it shows only the PCM and none of the many talons or the PDP and stuff in the CAN devices. Does anybody know how to fix this?

Is the PCM the first thing in the chain after the RoboRio? This would indicate to me that there is a wiring problem directly after the PCM, check for a broken (or missing) connection, crossed (ie yellow->green) wiring.

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