vb编制的和台达通讯的源代码，实现了基于VB的台达PLC与监控计算机的串行通信。-vb prepared and Delta communications source code, the realization of the VB-based Delta PLC and monitoring the computer s serial communication.

台达PLC和三菱变频写频率通讯，实际用过的，自己根据情况加以修改就行了-dvp plc rs485