modbus串口通信，利用vc6.0控件自己的项目中用到的代码，很好用。里面有两个程序，一个上位机，一个模仿下位的极的程序，可以互相通信。-modbus serial communication, the use the code the vc6.0 controls used in the project, to very good use. There are two programs, a host computer, an imitation of a bit extreme progr

这是西门子PLC通讯程序，无线传输，非常有用的例子，赶快下载-Siemens PLC communication program, wireless transmission, very useful example, to download

基于KEIL平台的USCOII modbus rtu程序项目文件,支持功能码 01 02 03 04 05 06 0F 10-Based on platform of Keil USCOII modbus rtu program project files, can support 01 02, 03 04 05 0F 10 function code