Flexi Port

Can be disabled, or connected to one of the following::Telemetry, GPS, I2C, DSM, EX.Bus, HoTT, SRXL, IBus, DebugConsole, ComBridge, MSP or MAVLink.

Main Port

Can also be left disabled, or connected to Telemetry, GPS, S.Bus, DSM, DebugConsole, MSP or MAVLink.

With DSM, this means the flight controller can work directly with a Spektrum satellite receiver.

Color	Pin	Electrical limits	Serial function	I2C function	RcInput functions S.Bus, DSM, etc...
Black	1	GND	GND	GND	GND
Red	2	4.8V - 10V	PWR Out (VCC Unregulated)	PWR Out (VCC Unregulated)	PWR Out (VCC Unregulated)
Blue	3	3.3V	TX	SCL
Orange	4	3.3V (5V Tolerant)	RX	SDA	TX (Signal input)