Answer Posted / kevin hackart

THE END-OF-LINE RESISTOR IS USED IN MOST ALARM SYSTEMS AS A
CABLE FAULT MONITORING DEVICE, EG.CABLE CUT BY INTRUDER.
THE MAIN CIRCUIT USES A SPECIFIED RESISTANCE AND THE MOMENT
THAT VALUE ALTERS OR DISAPPEARS IT TRIGGERS THE ALARM. ALSO
WHAT COULD BE USEFUL IN FIRE ALARMS IS IF THE CABLE IS
BURNT OFF OR HEATED THUS CHANGING THE RESISTANCE FURTHER
DOWN THE LINE IT WILL ALSO TRIGGER THE ALARM AND COVER FOR
A FAULTY DETECTOR. MAINLY THE RESISTOR IS FOR TAMPERING AS
MOST SYSTEMS USE A NORMALLY CLOSED LOOP AND SO IT IS EASY
FOR SOMEONE TO JUST SHORT OUT THAT CIRCUIT WITH A PIECE OF
WIRE, A SPECIFIC RESITANCE MAKES IT TOUGHER TO BE BYPASSED.

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