西门子MM440变频器上位机控制界面，可执行启动，加减速，正反转及停止等功能-Siemens MM440 inverter PC control interface, the executable to start, acceleration and deceleration, reversing and stop functions

51单片机和PC机通信，实现电脑控制单片机板子上的电机转动，加减速- 51 microcontroller and PC communications, and computer control of the motor rotates the microcontroller on the board, acceleration and deceleration