.net串口控件注册组件，在VC2008以后的版本，没有现成的串口控件，需自己添加-. Net serial port control register the component, in VC2008 later, there is no ready-made serial control, the need to add their own

通过串口与三菱PLC进行通信，能读取、写入各个软元件。(Through serial port and MITSUBISHI PLC communication, can read, write to each soft component)