Pinout

UART1 Port

1	VCC	Power input (+5.0V)
2	RX	Module UART1-RX
3	TX	Module UART1-TX
4	GND	Ground

UART2 Port

1	3.3v_SB	Power Out (+3.3V)
2	RX	Module UART2-RX
3	TX	Module UART2-TX
4	GND	Ground

I2C Port

1	VCC	Power input/output (+5.0V)
2	SCL	Module SCL
3	SDA	Module SDA
4	GND	Ground