欧姆龙的PLC，在VB中调用的串口，网络通信接口 有利用到FINS协议，读写PLC数据(OMRON's PLC, serial port in VB, network communication interface Have access to FINS protocol)

vb串口通讯源程序实例，里面源码可以实现串口通信(VB serial communication source instance, which can achieve serial communication source.)