Responsible for the acquisition of external signals, as people's eyes, when a moving object into its work range, it will give the main controller a pulse signal.
负责采集外部信号，如同人们的眼睛，当有移动的物体进入它的工作范围时，它就给主控制器一个脉冲信号。
A set of relay protocols are designed to make the system have relay function, which spread the work range of concentrator and reduce the costs of installation and maintenance.
同时设计了一套中继通讯协议，使终端具有中继功能，扩充了集中器的管理能力，降低了安装和维护费用。
A set of relay protocols are designed to make the system have relay function, which spread the work range of concentrator and reduce the costs of installation and maintenance.
同时设计了一套中继通讯协议，使终端具有中继功能，扩充了集中器的管理能力，降低了安装和维护费用。
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