说明：  上位机与单片机通讯的源程序，通过调用MSComm控件，处理单片机从串口接收的数据，并编写窗体按钮事件来向单片机发送数据。
(Communication between PC and microcontroller source code, by calling the MSComm control, processing data received from the serial port MCU, and the preparation of the form the button event to send data to the microcontroller.)