本文将对串口进行硬件原理的介绍，随后将逐章学习DOS 平台的串口编程，及Windows 平台下基于API控件和第三方类的串口编程，最后本文将给出一个综合实例。-In this paper, the principle of serial port hardware that will be followed by chapter study of the serial programming DOS platform and API based on Windows platform and third-party control of the serial-type programming, and finally this article will give a comprehensive example.