整个下位控制系统软件开发采用了开放式、模块化的设计方法，方便用户使用及功能扩展。
The whole lower software system ADAPTS the method of open and modularization architecture, it's convenient for users and function expand.
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.
针对整流桥测试设备中存在的功能不足，设计了以PC机为主机，分布在现场的各个单片机系统为下位机的主从式结构。
The SCMs mainly perform classification and testing for each rectifier and the PC accomplishes data display, counting, storing, printing and other functions about the test.
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