Spektrum SRXL2 receiver. No Radio calibration (resolved). No servo response after radio calibration

Hello
Problem: unable to perform radio calibration
Plane: Heewing T1 Ranger vtol
FC: Matek F405 vtol
Receiver: Spektrum SRXL2 DSMX Receiver with Connector Installed, SPM4650C
Radio: Spektrum DX7
Confirmed receiver wiring to the FC is good.
Flashed latest ardupilot build multiple times with INAV
Calibrated Accel multiple times
Calibrated compass multiple times
Binded receiver and radio multiple times

Still no green bars during radio calibration.

Has this happened with anyone else?

SRXL2 is a half-duplex protocol and thus the signal wire needs to be connected to TX on the UART - have you done this?

Hello
Heewing_Ranger_rev0.param (19.1 KB)

Yes I have it connected to TX2 per the Matek documentation. I’ve also set all of the SERIAL6 parameters per Matek and Ardupilot documentation. I’ve attached my parameter file.

This is the schematic I’m using for the FC
http://www.mateksys.com/?portfolio=f405-vtol#tab-id-4

Thank you for helping.

Set SERIAL5_PROTOCOL to 0

Hello. I tried setting SERIAL5_PROTOCOL to 0, but that did not resolve the situation. I then set it to -1. Subsequently I was able to calibrate the radio. Thank you.

However, now the issue I’m having is that even with radio input, the servo motors are not responding. I had some issues with arming/disarming, but even after arming it, there’s still no movement of the servos.

Has anyone experienced that?

Attached is my current parameters file.

Thank you

Heewing_Ranger_rev1.param (22.2 KB)