I've recently bind my both R9 slim + OTA receiver on my quad, one for Telemetry ON and one for Telemetry OFF (Redundancy built).
In CLI, I do make liked this,
set serialrx_halfduplex = OFF
set serialrx_inverted = OFF
get tlm
set tlm_halfduplex = OFF
set rssi_scale = 200
T18 Jumper...