Errors introduced early in the communication of requirements are the most costly system errors to correct, leading to patch development and increased maintenance costs.

在沟通需求的早期引入的错误是最难纠正的系统错误，会导致开发补丁，并增加维护成本。

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Availability of the communication service may be restricted for reasons of system maintenance.

通信服务的可用性，可能因系统维护的原因受到限制。

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Secondly, it introduces the communication protocol of this system, including the frame structure, instruction structure and the process of wireless network setting up and maintenance.

其次，讲述了本系统使用的通信协议，包括数据帧的格式、命令格式，以及无线网络的建立和维护过程。

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