The master communicates with the relay unit by serial communication interface and the relay unit communicates with module unit by wireless communication network.
上位机和中继单元之间采用串行口通信，中继单元和模块单元之间采用无线网路进行通信。
The master communicates with the relay unit by serial communication interface and the relay unit communicates with module unit by wireless communication network.
上位机和中继单元之间采用串行口通信，中继单元和模块单元之间采用无线网路进行通信。
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