很好的串行口学习程序，适合初学者，基础编码学习-A good learning process serial port, suitable for beginners, basic coding learning

开源.net HMI 框架,框架包含AB，Opc等plc驱动和免费的桌面环境控件.(Turn Visual Studio into a powerful HMI/SCADA development package by simply dragging and dropping, no coding required. DF1, Ethernet/IP for Allen Bradley PLC controllers, and many more drivers. Free)