一个基于VC6.0的上位机和S7－226进行通讯的实例，源代码清楚，是学习MSCOMM控件的一个好例子。

此程序为多线程,多接收模式串口类，程序很全，适合新手学习，同是也可以根据自己的兴趣添加自己感兴趣的各个功能-This program is multi-threaded, multi-category serial receive mode, the program is very full, for beginners to learn, the same can also add your own according to their interest in the various feat

用vc6.0写的一个串口通信程序，值得下载来学习学习。很不错的程序-With vc6.0 write a serial communication program, worth downloading to learn. Very good procedure

一个用vc6.0写的多串口控制软件，适合初学者学习-With vc6.0 write a multiport serial control software, suitable for beginners to learn