Spektrum SRXL2 receiver no response from Radio

Continuing the discussion from Spektrum SRXL2 receiver. No Radio calibration (resolved). No servo response after radio calibration:

Hello, I need your help.
I bought the HEEWING T2 VTOL CRUZER.It uses the Ardupilot HEEWING F405v2. I want to use the Spektrum AR8020T as the receiver. The transmitter is a Spektrum DX7.
I connected the AR8020T via a 4-wire cable from the SRXL2 socket to the flight controller Uart1 socket.
Is that correct?
The AR8020T connects to the DX7.
When I want to calibrate the remote control via Mission Planner 1.3.83, the green bars appear, but when I move the joystick, nothing happens.

Where am I going wrong?