Manual for F4 Brushed FC (No RX)

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

Receiver Connection

1) How to connect a receiver with SBUS signal output (Frsky XM+ / AC900 Dual Mode Receiver (FrSky & FUTABA) for example).

Here are the connection diagrams with XM+ receiver and AC900 Dual Mode Receiver 

We use the AUX12 channel as the RSSI signal channel in the XM+ receiver.

Step 1, on Betaflight GUI, configure the UART1 port to serial port in the 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.

2) How to connect a receiver with DSMX signal output.

Here is the connection diagram with the micro DSMX receiver.

Step 1, on Betaflight GUI, configure the UART1 port to serial port in the 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 SPEKTRUM2048. And click the Save and Reboot button in the lower right corner.

3) How to connect a receiver with TBS Crossfire signal output (TBS Crossfire Nano Rx for example).

Here is the connection diagram with the Crossfire Nano receiver. Using the UART1 on the FC board on the diagram below. 

On Betaflight GUI, configure the UART1 port to recognize the Crossfire protocol. First, configure the UART1 port to serial port in the Ports tab. Then click the Save and Reboot button in the lower right corner. 

Second, go to the “Configuration” tab, under the “Receiver” Section, select “Serial-based receiver“, and select “CRSF” in the second option. Don’t forget to enable the “Telemetry” feature too before pressing “Save”.

For more details about how to use the TBS crossfire receiver, check TBS CROSSFIRE SETUP WITH BETAFLIGHT on OscarLiang.

4) How to connect a receiver with Flysky IBUS signal output (Flysky FS-RX2A for example).

Here is the connection diagram with the FS-RX2A receiver.

Step 1, on Betaflight GUI, configure the UART1 port to serial port in the 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 IBUS. And click the Save and Reboot button in the lower right corner.