IC Realtime 1.3 MegaPixel Black Crystal Glass Apartment Outdoor Station - Manual (Page 23)

4
Vandal Proof Alarm It can generate an alarm when there is a
Button vandal operation.
Connect to RS422 or RS485
Communication Device.
5
RS422 Port
(Reserved)
6 Power Port Connect to 12V DC.
Control NO/NC of door lock.
7
Access Control
Output Port
20