> For the complete documentation index, see [llms.txt](https://principiot.gitbook.io/principiot-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://principiot.gitbook.io/principiot-docs/f7/uart-peripheral-mapping.md).

# UART Peripheral Mapping

| UART Assignment | Peripheral                         |
| --------------- | ---------------------------------- |
| UART 1          | Available on the expansion header  |
| UART 2          | RX (Receiver) port                 |
| UART 3          | GPS port                           |
| UART 4          | Cam (Camera) port                  |
| UART 5          | VTX (Video Transmitter) port       |
| UART 6          | Expansion header and ESC telemetry |