HIKVISION DS-K1T105E-C

Access Control Terminal·Quick Start Guide
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Signal input interface of the door status (DOOR_NC, DOOR_COM, DOOR_NO) is
used to recognize whether the door is locked. If the NC interface is connected
for opening door, the NO interface can only be connected for locking door.
4.3.2 The Wiring of Door Contact
Figure 4-4 The Installation of Door Contact