厦门智能仪表通讯协议 宇电协议 给有需要串口编程的人帮助-yudian xieyi

PLC与上位机的通讯方式PPI通讯 以太网通讯 MPI通讯 RS485串口通讯 -PLC and superordination machine of communication profibus RS485 communication frames Computer communication manner

最新VB上位机参考书籍，主要讲述的是串口通讯，详尽丰富的例子，通俗易懂，可以缩短开发时间，也是新手学习的好工具。-Last VB PC reference books, mainly about serial communication, detailed examples of rich, easy to understand, you can shorten development time, but also a good tool for beginners to learn.

PC串口通讯上位机 对PLC调试，数据的读取，发送-The PC program to communicate with PLC, debugging, a serial port to read data