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2. Access control - Wikipedia

   en.wikipedia.org/wiki/Access_control

   When access is denied based on the access control list, the door remains locked. If there is a match between the credential and the access control list, the control panel operates a relay that in turn unlocks the door. The control panel also ignores a door open signal to prevent an alarm.

3. Video door-phone - Wikipedia

   en.wikipedia.org/wiki/Video_door-phone

   A video door-phone (also known as a video door entry or video intercom) is a stand-alone intercom system used to manage calls made at the entrance to a building ( residential complex, detached family home, workplace, etc.) with access controlled by audiovisual communication between the inside and outside. The main feature of video door entry is ...

4. Crash bar - Wikipedia

   en.wikipedia.org/wiki/Crash_bar

   Crash bar. A crash bar (also known as a panic exit device, panic bar, or bump bar) [1] [2] is a type of door opening mechanism which allows users to open a door by pushing a bar. While originally conceived as a way to prevent crowd crushing in an emergency, crash bars are now used as the primary door opening mechanism in many commercial buildings.

5. Electromagnetic lock - Wikipedia

   en.wikipedia.org/wiki/Electromagnetic_lock

   Operation. The principle behind an electromagnetic lock is the use of electromagnetism to lock a door when energized. The holding force should be collinear with the load, and the lock and armature plate should be face-to-face to achieve optimal operation. The magnetic lock relies upon some of the basic concepts of electromagnetism.

6. Security alarm - Wikipedia

   en.wikipedia.org/wiki/Security_alarm

   A security alarm is a system designed to detect intrusions, such as unauthorized entry, into a building or other areas, such as a home or school. Security alarms protect against burglary ( theft) or property damage, as well as against intruders. Examples include personal systems, neighborhood security alerts, car alarms, and prison alarms.

7. Mantrap (access control) - Wikipedia

   en.wikipedia.org/wiki/Mantrap_(access_control)

   A mantrap, security mantrap portal, airlock, sally port or access control vestibule is a physical security access control system comprising a small space with two sets of interlocking doors, such that the first set of doors must close before the second set opens. [1] [2] [3] Airlocks have a very similar design, allowing free ingress and egress ...