I finished wiring my RV-14's G3X system and attached the wings today. The RV-14 wiring harness includes CAN bus termination in the right wing at the aileron autopilot servo and in the tail at the elevator autopilot servo. I thought that I had been conscientious during my wiring, and as far as I can tell all the other wires are working. RS-232 from the PFD to the EIS, to the ADAHRS, and to the GTN 650 all work okay. RS-232 from my Vertical Power VP-X Pro to the MFD works.
Unfortunately, I have zero success with the CAN bus. The PFD does not see anything else on the bus. I did check resistance between the HI and LO pins on one connector and got 60 ohms, which is correct for a 120-ohm terminating resistor at each end, in parallel. I tried powering on just the PFD and a handful of other devices, one at a time (tried GTR 20, GMA 245R, G5, MFD, and autopilot servos) to no avail.
Before I (a) pull my hair out or (b) pull all the wires out, I'm wondering if anyone has some troubleshooting tips that I can try on an incremental basis to find and solve the problem. I know I'm not the first person to go down this road so I hope to hear some reassurance this weekend. Thanks in advance!
P.S. Even if I have to rewire the whole thing, I'll still be on cloud 9: we moved the fuselage to the airport and bolted the wings on today. It's never looked more like an airplane than it does tonight!
Unfortunately, I have zero success with the CAN bus. The PFD does not see anything else on the bus. I did check resistance between the HI and LO pins on one connector and got 60 ohms, which is correct for a 120-ohm terminating resistor at each end, in parallel. I tried powering on just the PFD and a handful of other devices, one at a time (tried GTR 20, GMA 245R, G5, MFD, and autopilot servos) to no avail.
Before I (a) pull my hair out or (b) pull all the wires out, I'm wondering if anyone has some troubleshooting tips that I can try on an incremental basis to find and solve the problem. I know I'm not the first person to go down this road so I hope to hear some reassurance this weekend. Thanks in advance!
P.S. Even if I have to rewire the whole thing, I'll still be on cloud 9: we moved the fuselage to the airport and bolted the wings on today. It's never looked more like an airplane than it does tonight!