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 bar personal feeling to do VB and 200 communication is very helpful, the gods do not have to learn, novice can learn from it. Progress with each other!!!)