Note: When you connect the receiver to FC, please don't forget to plug the battery, otherwise the reciver will not work at all because if you don't plug the battery, the reciver doesn't have any power to work. 


1)Here are the connection diagrams of Frsky R-XSR receiver with F4 12A AIO Brushless FC.

There are two method for connection.


Method 1: (Please note that you cannot get RSSI by using this method)

Step1 On Betaflight GUI, configure the UART2 port to serial port in Ports tab. Then click the Save and Reboot button in the lower right corner.

Step 2 In the Configuration tab, for Receiver Mode, choose Serial_based receiver (SPEKSAT, SBUS, SUMD); Serial Receiver Provider, choose SBUS. And click the Save and Reboot button in the lower right corner. 



Method 2: (Use Fport function of the receiver)


Step1 Flash the receiver's firmware to the firmware which can support Fport. (Please click here to download the firmware.)

Step2 On Betaflight GUI, configure the UART2 port to serial port in Ports tab. Then click the Save and Reboot button in the lower right corner.


Step 3 In the Configuration tab, for Receiver Mode, choose Serial_based receiver (SPEKSAT, SBUS, SUMD); Serial Receiver Provider, choose FrSky FPort, turn on TELEMETRY. And click the Save and Reboot button in the lower right corner.


 


Step 4 In the CLI tab, input command:

set serialrx_halfduplex = ON 

set serialrx_inverted = OFF

save