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