1. RS-232C 9 Pin Specification
PIN
NO
Description Specification
Male D-Sub Connector
1 GPIO1 TTL (DC+3.3V)
2 RX Data RS-232C
3 TX Data RS-232C
4 GPIO2 TTL (DC+3.3V)
5 Ground Ground
6 GPIO3 TTL (DC+3.3V)
7 RTS RS-232C
8 CTS RS-232C
9 DC+5.0V Input Voltage
