Pinout

4-Pin JST-GH Connector

Pin	Function	Description
1	VCC	Selected voltage (3.3V or 5V)
2	TX	UART transmit
3	RX	UART receive
4	GND	Ground

6-Pin JST-GH Connector

Pin	Function	Description
1	RST	Reset (active low)
2	RX	UART receive
3	TX	UART transmit
4	VCC	Selected voltage (3.3V or 5V)
5	CTS	Clear to send (optional)
6	GND	Ground