The communication between PC and the AT89C52 chip is achieved through the RS232 bus,so scanning mode,rotate speed,step and direction of step motor are setup expediently.

• 利用AT89C52单片机控制两台步进电机,通过RS232总线进行上位机(PC)与下位机(AT89C52)的通讯,可方便地进行步进电机扫描方式、转速、步长和方向的设置,实现了对步进电机的精确控制。