介绍了如何用计算机实现短消息收发的关键技术，主要是串口实现通讯的方法。

Meanwhile, introduced the key technology that how to send and receive a short message with computer, mainly the technology of serial communication.

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群集系统的消息收发层提供了解服务存在(或缺少)所必需的消息收发与成员功能。

The messaging layer of a cluster system provides messaging and membership capabilities that are necessary for understanding the presence (or lack) of a service.

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第四部分介绍了和短消息收发相关的AT指令，以及用at指令进行收发短消息的实例。

The fourth part has introduced at commands relevant to receiving and delivering short message, and the instance that receiving and delivering short message with at commands.

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