VB 上位机 通过串口与单片机的通信的延时程序，该演示程序包含了普通的串口通信方式，还包含了上位机与单片机通信实例，是个不错的参考-VB host computer through the the serial microcontroller communication delay program, the demo program contains a common serial communication, also contains a host computer to communica

西门子S7-200与上位机监测软件,很好用的-Siemens S7-200 and PC Monitoring Software