Wiring hard-wire security detectors with secure method

AUSTELL, Ga. - June 28, 2022 - PRLog -- Why do we learn wiring and principle of wired detector？
Wireless alarm detector and IP monitor are easy to install. Home users can easily install and monitor home security themselves. In commercial security, the development of various wireless protocols such as NB-LOT and ZigBee has led to the development of more remote and reliable wireless alarm security products. Wireless alarm detectors are widely used in security and smart home systems.
But wireless alarm detectors have disadvantages. They are more expensive and less stable and safe. Wired detectors are still often used in industrial and commercial security projects.
In addition, wired detectors are used for early installed home security system, when replacing the detector, you need to buy the same type of wired detector to replace.
So, it is necessary to learn wiring and principle of wired detector.
There are a wide variety of wired detectors, including infrared detectors, infrared and microwave dual technology detectors, door and window switches, glass breaking detectors, water leakage detectors, vibration detectors, smoke detectors, gas detectors, infrared beam and microwave beam sensors. Different brands of wired detector (https://vedardalarm.com/wired-security-sensor-c-18_4) can be replaced for each other.
Why are wired detectors more stable and secure?
The wired detector is not interfered by wireless signal, leading to failure of alarm sending. The power supply of the wired detector is provided by the alarm host, and the detector will not be idle because of low power or no power.
What happens if the wire detector line is cut or shorted?
There is special wiring of the last detector by adding EOL resistor at the end of the circuit to provide line supervision. With it, line cut or shorted will report fault to alarm host. We will introduce the wiring types and principle of wired detectors as following.
The wired detector alarm output loop has N/C (Short for Normal Closed) and N/O (Short for Normal Open). Usually, anti-theft detectors such as infrared intrusion detectors and door magnetic detectors use N/C circuits. When the N/C circuit is cut by thieves, the alarm will be immediately reported. Fire detectors and emergency alarm detectors such as smoke detectors and gas sensors adopt N/O circuit. When the N/O circuit is bitten off by a mouse, it does not send an alarm signal but a line fault signal. Therefore, monitoring personnel can correctly distinguish between alarm and line problems and deal with them in time.
The EOL resistor values are 1KΩ, 2.2KΩ, 4.7KΩ, 5.6KΩ and 6.8KΩ. This is determined by the alarm host. The wired detector alarm output N/C loop needs to add the EOL resistor in parallel.