Serial 2 / Telemetry 2 / IRDA

Pinout and schematic for the Telemetry 2 port, which can also be configured as IRDA or extra I2C bus.

On older versions of the RDDRONE-FMUK66, this port could only be used as IRDA. Since RDDRONE-FMUK66 Rev. C, it is by default configured as a free UART, which can be used as Telemetry 2 in PX4. It can still be reconfigured to use it as IRDA or as an extra I2C bus, though pull-up resistors will have to be placed by hand.

RDDRONE-FMUK66 Rev. C connector pinout

Pin	Signal	Voltage
1	VCC	+5.0V
2	UART TX	+3.3V
3	UART RX	+3.3V
4	GND	GND

RDDRONE-FMUK66 Rev. C schematic

RDDRONE-FMUK66 Rev. B connector pinout

Rev. B (and older boards) are not supported anymore. This information is left for reference.

Pin	Signal	Voltage
1	GND	GND
2	UART RX	+3.3V
3	VCC	+3.3V
4	IR-	+5.0V
5	IR+	+5.0V

RDDRONE-FMUK66 Rev. B schematic