PLC单片机在工业上的应用越来越广，这几个源代码都是关于PLC单片机写PC之间的通讯的，不错，值得一看。-PLC microcomputer applications in industry more widely, these source code is written on the PLC MCU communication between the PC, well, worth a visit.

能够和单片机串口通信的上位机程序,有强大的功能，界面还行，读者可以做个和网络连接的上位机-it can communicate with 51MCU