在CNC系统中,用于数控机床的小型计算机的接口电路如何设计,是关键问题之一.本文简述DJS—130小型计算机接口电路的主要设计思想和设计方法.从计算机输出信号的分析中和从机床所需要的信号的分析中找出了一些设计原则.这些原则不仅可用于CNC系统而且也可以在计算机控制的其它工业对象中用.用这些设计原则,已经设计并制成了一个实际的CNC系统,它的工作正常. In the CNC system, how to design the interface circuit of the small computer used in the CNC machine tool is one of the key issues.This paper briefly describes the main design ideas and design methods of the DJS-130 small computer interface circuit.From the analysis of computer output signal and From the analysis of the signal required by the machine tool, some design principles are found that can be used not only in the CNC system but also in other computer-controlled industrial objects. With these design principles, a practical CNC system, it works fine.