说明： 这个文件是有关系统串口通信的实例，作为学习串口通信入门来说是一个很好的参考实例，它是基于vb语言的，而且其中很多代码可以直接移植 (this paper is on the serial communication system examples, as a learning portal Serial Communication is a very good reference example, it is based on vb language, but many of them can be directly transplanted code)
