VB做的上位机软件，和西门子S200通讯，代码是其他网站下载的，这里是转载吧 个人感觉对做VB和200通讯很有帮助，大神级的就不用学习了，新手可以借鉴一下。彼此进步吧！！！(VB to do the host computer software, and Siemens S200 communication, the code is downloaded from other websites, here is the reprint