详述了上位机软件的功能、模块及数据的组织，分析了主程序流程和与下位机通信的流程。
The software function, modules and data organization of the Upper Layer Computer are explained, the process of main program and that of the communication with Upper Layer Computer are narrated.
本文在对CNC系统进行面向对象分析的基础上，建立了以PC机作为上位机，DSP运动控制器作为下位机的主从式数控铣床系统。
Based on the object-orient analysis of CNC system, the paper proposes a design idea of master-slave CNC system, which builds with PC as upper chip and motion controller with DSP as lower chip.
本文提出语义角色系统的设置应有上位、下位之分，并进而设置了确定主语的语义角色系统和在语义平面作语义结构分析的语义角色系统。
Based on this division, the thesis constructs a superordinate semantic system for identifying Subject and a subordinate semantic system for analyzing semantic structure on semantic dimension.
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