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本文针对一种由工业控制计算机和步进电机控制卡构成的主从式车床数控系统，介绍了该系统的通讯协议，并重点阐述了在Ｗｉｎｄｏｗｓ９５平台下工业控制计算机和步进电机驱动卡之间双向并行数据通讯的实现方法。
In this paper, a master-slave lathe CNC system composed of industrial control computer and stepper motor control card is introduced, and the communication protocol of the system is introduced. The paper also elaborates on the communication between industrial control computer and stepper motor driver card under the Windows95 platform Two-way parallel data communication implementation.