A quick run down of some of the common features found on modern car alarm systems. If you are confused by phrases such as anti scan, anti grab, total closure or passive arming then this is for you.ANTI GRAB: See Random Encryption.ANTI HIJACK: Prevents a thief forcing a driver to hand over his keys and driving off with the car.ANTI SCAN: The alarm will ignore a device such as a radio scanner which bombards it with multiple codes in order to find the correct code.ARM CONDITION MEMORY: If the power to the alarm is disconnected it remains in the same state when it is reconnected so that the alarm cannot be disarmed by disconnecting and reconnecting the power.AUTO RE-ARM: Prevents accidental disarming of the alarm. If the alarm is disarmed an no doors are opened within a period of time (usually 30 seconds) the alarm will re-arm itself.AUXILLIARY OUTPUT: An output that be controlled from the remote control. Useful for control of electric boot releases, add on remote start modules, neon lights etc.BATTERY BACK-UP: Allows the siren to continue to sound even if the car battery or alarm wires are cut.BONNET SWITCH: A device to detect when the cars bonnet is opened.BOOT RELEASE: An output that be controlled from the remote control and used for control of an electric boot release.CDL: Short for Central Door LockingCENTRAL DOOR LOCKING: Most alarms will also control your cars central locking so that the doors are locked and unlocked when the alarm is armed and disarmed.COMPACT ALARM: An alarm that has all the electronics built into the siren. Generally considered less secure than a modular alarm and more susceptible to water damage of the alarms electronics.EMERGENCY OVERRIDE: A method of overriding the alarm should the remote control fail to function or is lost.IGNITION LOCKING: A safety feature where the doors are automatically locked when the ignition is turned on.IMMOBILISER: Cuts a vital electrical circuit off preventing the engine from being started.LAST DOOR ARMING: See Passive ArmingLCD DISPLAY: Some alarms have an LCD display built into the remote control. This give visual confirmation that the alarm is armed, which detector has triggered it and if the remote engine starter is operated.LED: Flashing light usually installed on the dashboard to indicate that the alarm is switched on.MICROWAVE DETECTOR: A device that detects movement inside the car, not susceptible to air movement inside the car. Can be used with convertibles even when the roof is down.
Orignal From: Car Alarm Glossary
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