在软硬件开发平台的基础上，本文还详细介绍了硬件接口层的软件设计和应用层的软件开发和设计过程。

On the basis of both the hardware and software development platform, this paper introduces the detailed software design process of hardware abstract layer and system application layer.

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对104规约硬件接口层实现的两种模式进行了比较，编制了支持IEC60870 - 5 - 104规约的应用软件。

The two modes of hardware-interface layer of 104 transmission protocol are compared, and the application software which supports IEC60870-5-104 transmission protocol is worked out.

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协议层下面是另外一个无关接口层，它将协议与具有很多各种不同功能的硬件设备连接在一起。

Below the protocols layer is another agnostic interface layer that connects protocols to a variety of hardware device drivers with varying capabilities.

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