本程序是通过串口，经由单片机控制电机转速的程序。该程序通过串口发送不同的信号，以实现控制通信。-this procedure is adopted Serial through SCM motor speed control procedures. The procedure adopted Serial send different signals to achieve control and communication.

利用VC++实现的电机转速控制上位机程序，下位机为MCS51单片机系统，采用串口通信实现电机转速的PID控制。-Using VC++ to achieve motor speed control PC program, the next crew for the MCS51 microcontroller system that uses Serial Communication PID motor speed control.