This paper also describes the hardware design and the software flow chart and the on-the-spot survey result is given.

文中叙述了该系统的硬件设计及软件流程图，并给出了实测结果。

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This paper detailedly introduces the whole design scheme of the system, the circuit on interface module and 89c51, the method of the software design and program flow chart.

详细阐述了系统的总体设计方案，给出了界面模块与89c51接口电路，最后介绍了软件设计方法及程序流程图。

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Compared to conventional software design based on flow chart, the protection software is developed based on relay function module, which leads to the separation of time sequence and logic.

该方法摒弃了传统的基于流程图的设计思路，将软件的时序与逻辑分离，模块性好，结构清晰，软件的开发、维护方便。

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