Pinout

UART1

Pin	Signal	Voltage
1(red)	VCC	Power +5V
2	RX(in)	TTL 3.3V
3	TX(out)	TTL 3.3V
4	SCL1	TTL 3.3V
5	SDA1	TTL 3.3V
6	SAFETY_SWITCH	TTL 3.3V
7	SAFETY_SWITCH_LED	TTL 3.3V
8	VDD_3V3	Power +3.3V
9	BUZZER-	Open drain Output 0~5V
10	GND	GND

UART2

Pin	Signal	Voltage
1(red)	VCC	Power +5V
2	RX2(in)	TTL 3.3V
3	TX2(out)	TTL 3.3V
4	EVENT A	TTL 3.3V
5	PPS	TTL 3.3V
6	GND	GND