Connecting Radiomaster ER6, Radiomaster Tx12 and Pixhawk 6c

Hello, I have bound a Radiomaster ER6 to the Radiomaster Tx12. I have also connected the ER6 to the Pixhawk 6c from CH1 on the receiver to the PPM/SBUS RC port on the Pixhawk 6c. However, On mission planner, when I went to the Radio Calibration page, all of the bars show 0 and do not move when I move the sticks on the transmitter. Please help me fix this.

How did you enabled SBUS or CRSF output on your receiver?
So far i saw on the ER6 docu the serial output is not on CH1 but on an extra connector.

I assume that the receiver is properly supplied with the necessary supply voltage by the FC

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@Juergen-Fahlbusch Then what is CH1 used for? is there any way to use CH1 to connect to the Pixhawk? With the other port on the receiver, my wire does not fit in the TELEM3 port on the Pixhawk, it would only fit the USB, CAN1, CAN2, or the I2C port. Please help me with this.

@Juergen-Fahlbusch Please help me with this

Ch1 PWM out on an ExpressLRS receiver isn’t used for anything other than discrete single channel output so far as I know. It’s not useful to your autopilot.

You need to connect the receiver to a serial port. The 4 pins on the UART connector of the receiver are used for that. The autopilot may have more pins on its serial ports. You must re-pin a connector for that purpose.

Connect power and ground, then connect receiver RX to autopilot TX and vice versa.

References for configuration:

https://ardupilot.org/copter/docs/common-tbs-rc.html

https://www.expresslrs.org/quick-start/ardupilot-setup/

@Yuri_Rage As I mentioned in my previous message, the only wire that can connect the UART connector to the Pixhawk can only connect to either the USB, CAN1, CAN2, or I2C ports. Which one should I connect to?

EDIT: On the Pixhawk 6C, Telem3 (SERIAL5) is the one suggested for use with serial RC protocols. Again, you will have to re-pin a connector for this purpose and refer to the pinout description on the autopilot’s documentation page.

https://ardupilot.org/copter/docs/common-holybro-pixhawk6C.html