计算机串口为9针
PLC端为15针, 且针脚定义如下:
1: NC unused
2: SD date sent from COMM module
3: RD date sent to COMM module
4: RS at high level when COMM module is ready to receive data
5: CS must be high when COMM module transmits data
6: RV1(ER) data terminal ready
7: RV2(DR) data set ready
8: PHL do not connect
9,10: SG signal ground
11,12:
13:
14:
最后修改：2005-1-24 13:55:43
