How to connect a wired intruder alarm system


How to connect a wired intruder alarm system

Intruder Alarm

Intruder alarm is a system that prevents unauthorised access to your home or work place. It will alert an authorised person or organisation by an internal or external siren/strobe or sending signal. There are four main components in an alarm system.

  • Detectors
  • Panel
  • Output
  • Input


There are many type of detectors such as

PIR (Passive Infrared Sensors), door contacts, microwave detectors, photo electric-beams, glass break detection, smoke, heat, and carbon monoxide detectors, smoke, heat, and carbon monoxide detectors, e-field, fibre optic cable, wired and wireless detectors and etc. Detectors will response to an external event that causes a change in a specific environment.



Alarm panel is the brain of an alarm system. All detectors, input devices, output devices and external links are connected to this panel. Panel will be powered by main ac (alternative current) power and a backup battery power. Mostly panel will be triggered by current flow and resistor level. Panel will monitor each loop and any changes to the current level will be notified the panel and it will then trigger the output device or any external communication link.



Siren, strobe and telecommunication link are common intruder alarm outputs. When an event is occurred alarm panel will trigger the output devices. Panel will monitor the loop between output device and panel. If an output device is faulty, it will notify the user.



The main type of input is keypad and other devices such as personal computers can also be used as input with the right software. Latest development to this is mobile phone application, many leading alarm panel manufacturer have developed mobile phone application which can control the panel.


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