PIN 名稱 功能
1 RDA RS422; receive data inverted
2 GND Ground
3 RDB RS422; receive data not inverted
4 RxD RS232; receive data
5 SDB RS422; transmit data not inverted
6 DC 24 V Power supply for HMI
7 SDA RS422; transmit data inverted
8 TxD RS232; transmit data