说明：  在Windows应用程序的开发中，我们常常需要面临与外围数据源设备通信的问题。计算机和单片机（如MCS-51）都具有串行通信口，可以设计相应的串口通信程序，完成二者之间的数据通信任务。
(In Windows application development, we are often faced with the need for external data source device communication problems. Computers and single-chip microcomputer (such as the MCS-51) have a serial communication port, you can design the corresponding serial communication procedures, the completion of data communication between the two Missions.)