关键词: CNC系统, 实时软件, 通信接口, 软件建模, 数字信号处理器, PC/104总线

Abstract:

In order to rapidly design a real-time multi-task software prototype of CNC r Computerized Numerical Control)system,the MDD(Model-Driven Development)method is applied to the modeling analyses of the require-ment,the structure and the behavior.Based on the requirement analysis.the functional requirements of CNC soft-ware are obtained,and these functional requirements are then mapped into classes or objects via the structure analv-sis.By the behavior analysis,the actions of these classes or objects are established. Moreover,the problems of communication interface between the host and the slave are solved in the designing of a real-time multi-task CNC system ,and the communication reliability is thus guaranteed.Moreover ,a communication interface scheme based on HPI(Host Port Interface)is presented by analyzing the communication management state machine.With the proposed method and scheme,a CNC system prototype is designed and tested ,and its feasibility is verified.

Key words: numerical control system, real-time software, communication interface, software modeling, digital sig-nal processor, PC/104 bus