Access control system is able to recognize door status and door events. It may be an alarm situation. In which case the system must send alarm signals. It also may be a normal situation. So, the system signals no event.
In this article I will walk you through the doors status and events that any security system must recognize.
Access control is the techniques used to control passage into or out of any area. It supervises doors. Grants or denies access and signal the following door status and events:
Door events
- Access granted
An authorized user gets access after he presents his credentials to the system. For example, when he swipes his card, the door opens. Thus, the system sends the Access granted status.
- Access denied
Whereas an unauthorized user will get an ungranted access because he is not allowed in. His may be allowed but at a different schedule.
- Door forced open
It is described as a door open with no granted access event.
- Door opened too long
After an access granted event, the door must be closed and goes back to its normal status. If not, the system sends an alarm signal. for instance, it could make the reader sound.
- First person in
The system will note that a user has entered. This function is generally used when integrating access control with the alarm system. Therefore, the alarm system could automatically disarm itself through the access control system. In this case, it is not necessary to disarm on the keypad.
Door status
- Door open
A door sensor signals that the door is open. It is a situation that is supposed to be limited in time, very often it is about 10 seconds extensible when a user needs a little more. For example, a mobility reduced person.
- Door closed
This is the normal situation of a secured door. It must be closed at all time.
Note that a door can be scheduled to stay open at certain times. For example, a door to the reception during working hours.
- Door locked
It is a closed door. But there is a difference between a closed door and a locked door (refer to a secured door below)
- Door unlocked
The operator can temporarily unlock a door to let in someone who does not have an access card. He can also unlock it for a certain period of time
- Door secured
The access control system could recognize if the door is locked or not. There is a switch in the door strike that supervises the latch bolt. As a result, it sends a status signal locked and secured.
- Door unsecured
A door can be closed. This status is supervised by a door contact. But it could be not locked if the latch bold is not engaged.
Devices giving door status and events
A door sensor allows to know if the door is closed or open.
- Door strike switch
It supervises the latchbolt. It triggers if the latch bolt is engaged so it gives the status of the door whether it is secured or not
- Request to exit
It detects a person when exiting the protected area. Thus, when triggered, the opening door will not cause an alarm.
In short, a protected door opens if an access is granted or if a request to exit is triggered. Otherwise, int sends an alarm.
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