串口通讯控件，提供串口通讯类程序。为串口编程提供方便-Serial communication control, to provide serial communication type of proceedings.

用VB编程与三菱A系列PLC通信的源码,需要编写串口通讯工程的可以参考,(VB programming with Mitsubishi A series of PLC communication source code, the need to write serial communication engineering can refer to,)