说明：  这是一个51单片机与电脑通过串口通信的例子，包括单片机程序和主机程序，主机程序采用VC编写，使用CSerialPort串口类
(This is the example of a 51 and a computer via serial port communication, including single-chip program and the host of the program, the host program prepared using VC, to use CSerialPort serial class)