VB与台达PLC通讯程序源码 可以监控台达PLC的输入输出状态 注释很好的解释了通讯协议的用法-VB and Delta PLC communication program source code can monitor the the Delta PLC input and output status note explained the communication protocol usage

Modbus的通讯协议实现，实现简单，代码简洁，Modbus学习者的好材料-The realization of Modbus communication protocol, the realization of a simple, concise code, a good material for Modbus learners