VC编写PC与PLC通信的程序，在VC与PLC串口通信时，运用MSCOMM控件可以实现通信-VC to write PC and PLC communication program VC PLC serial communication, the communication can be achieved using MSCOMM control

串口通信程序，MSComm方式实现，有参考价值-Serial communication program, MSComm ways, have reference value