UART mapping
| UART | Reference connection |
|---|---|
| UART1 | RX connector |
| UART2 | AVTX connector |
| UART3 | GPS connector |
| UART4 | HDVTX connector |
| UART5 | ESC telemetry input |
| UART6 | HDVTX auxiliary RX |
Match wiring to configuration
Use a port plan that records the connector, physical UART, peripheral, protocol, and firmware setting. These are separate pieces of information: a correct wire does not automatically enable the matching function in Betaflight.
After confirming the board's mapping, configure the required functions in Betaflight's Ports tab. Follow the peripheral's protocol requirements and the official Ports guide; do not enable unrelated functions on the same UART.
The extra receive signal on the digital-video connector is not a second complete TX/RX port. Whether it is needed depends on the connected system.