| This dissertation mainly introduces a host-slave system of a three coordinates printed circuit board numerical control drilling and milling machine. Control instructions and parameter have been delivered by the master computer to slave computer dependently and smoothly in order to guarantee the work that can be accurately and promptly done. Besides, the host computer collects various kinds of state signals that the slave computer feedbacks, then diagnoses and deals with them. The article analyzes the development schemes of the host computer interface card, the adapter principle of the printer and reasons of selecting it. Having studied signals of printer ports further, thus I determined the communication mode between the host computer and the slave computer, and designed communication circuit. The question of programming has been discussed. In addition, I have finished its important design of the single-chip computer: the design of hardware circuit, making PCB, the architecture of the slave computer and some function modules. There are some achievements of this subject: Strengthen the open of the software; Double CPUs have accelerated the computational speed; The module structure of hardware has improved systematic dependability, and it benefits further expansion and upgrading the NC system; Strengthen programming function, figure function, man-machine dialogue function, diagnosing and communication function; The developments of this system establish foundation for our school's develops machine control system, machining center and flexible manufacturing system, etc further in the future.
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