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Roller Shutter | 卷帘门磁

A roller shutter contact commonly just called a "Roller Shutter" is one that detects when an upwards opening door moves. When the door is opened and the shutter goes up, it detects the movement (as the contacts open) and triggers an alarm.

卷帘门磁一般探测朝上开门的动作。当门打开时，卷帘向上（门磁打开）收起监测到移动并触发警报


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