Serial 1 / Telemetry 1

Serial port meant for use with telemetry radios, or to communicate with a companion computer.

The serial port can be used to communicate with the FMU either remotely or with a companion computer on the drone itself. Often telemetry radios are connected to this port to provide a wireless connection with a ground control station. By default, PX4 listens and communicates using the MAVLink protocol on this port.

Serial 1 / Telemetry 1 / (UART 4) connector pinout

Pin

Signal

Voltage

1

VCC

+5.0V

2

UART TX

+3.3V

3

UART RX

+3.3V

4

UART CTS

+3.3V

5

UART RTS

+3.3V

6

GND

GND

RDDRONE-FMUK66 Rev. C schematic

RDDRONE-FMUK66 Rev. B schematic

Telemetry

Telemetry radio sets usually have different versions. The 433 MHz version is used in Europe, while 915 MHz is used in the USA. Make sure you have the right version for your location.

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