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8 Things You Should Know About Security System That Tells You Which Door Is Open | Door and Window Alarms
- The door alarm monitoring feature is a necessary part of any automated security system. It makes no sense to install an expensive card access control system if doors can be opened without using an access card, or if people can walk in freely through doors that have been propped open. When working correctly, the door monitoring feature greatly improves security and provides assurance that all doors are being used as intended. - Source: Internet
- REX motion detectors need to detect people just as they are ready to open the door. Too often, REX motion detectors are placed where they detect people approaching the door rather than at the door itself. This is sometimes done with good intentions (“I will detect them long before they get to the door”) but can create a “blind spot” in front of the door itself. (See Figure #1 below). - Source: Internet
- When a user presents his or her card at the card reader, the reader sends a signal to the access control system. If the card is valid, the access control systems sends a signal back to the electric lock hardware, causing the door to unlock. As the user opens the door, the door position switch sends a signal to the access control system, but because a valid card has just been used at the reader, the access control system does not cause a DFO alarm to occur. - Source: Internet
- In addition to controlling access, most card access control systems also provide a door alarm monitoring feature. The purpose of door alarm monitoring is to detect improper use of the card access controlled door. Two types of door monitoring are commonly provided: - Source: Internet
- Unfortunately, the door alarm monitoring feature is a major source of of grief at many facilities. The problem: false DFO alarms. In most cases, these false alarms occur even though employees have done nothing wrong; they simply used the access controlled door in normal manner, yet the system triggered a false DFO alarm. In larger facilities, this can occur hundreds or even thousands of times per day. These alarms can flood the security monitoring center, overwhelming the monitoring staff. - Source: Internet
- In most cases, the access control system is designed so that a security monitoring center is notified whenever a DFO or OTL condition occurs, allowing an appropriate security response to be made. In some cases this may involve dispatching a security officer to the door to investigate; in other cases, an employee working near the door may be called and asked to see what is going on at the door. If the facility has a video surveillance system, the monitoring center may also use a video camera to observe activity at the door. - Source: Internet
- Eventually, monitoring staff may become complacent about DFO alarms, or choose to ignore them completely. At some facilities, false DFO alarms can be such a problem that management becomes frustrated, and chooses to permanently disable the door alarm monitoring feature. Neither of these responses is appropriate as they decrease the overall level of security at the facility and turn the access control system into just an electronic locking system. - Source: Internet
- When a user approaches the door to exit, he or she activates the REX device. In the case of a REX motion detector, this occurs when the user steps into the detector’s coverage area. In the case of a REX switch inside of hardware, this occurs when the user turns the door handle or presses the exit bar. When using a manual REX button, this occurs when the user presses the button to leave. As the user opens the door, the door position switch sends a signal to the access control system, but because a REX device was just activated, the access control system does not cause a DFO alarm to occur. - Source: Internet
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Video | Security System That Tells You Which Door Is Open
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