说明：  这个是windows版本的.就是用串口通讯线将两台机子用串口连起来进行通讯，最简单的。比如在a机上输入一个字符，在b机上能显示出来
(This is a windows version of the. Serial communication is to use two machines will be used for serial-link appear, the most simple. For example, in a plane into a character, b plane will display)