Alarm systems are a sub-section of access control systems with this difference that their function is to detect unauthorized access

Alarm systems are a sub-section of access control systems with this difference that their function is to detect unauthorized access and create alerts. Regarding the focus on diagnosis in this field they are specialized to have detailed performance. These systems are being used to protect inside of buildings, the area surrounding the buildings and open areas.

According to needs of area, appropriate sensors are being used. Alarm is also created in many ways., locally with audio and visual warnings or sending alarm through phone line or network.