Patent ID: 6249225
Filing Date: 2001-06-19
Classification: G08B

Abstract:
An auxiliary alert process of an existing alarm system, which is currently installed in a structure for general security purpose, having at least an entrance/exit sensor installed at an entrance/exit of said structure, comprising the following steps:(a) maintaining said entrance/exit sensor installed at said entrance/exit of said existing alarm system in functioning condition when said existing alarm system is in a disarmed condition;(b) monitoring said entrance/exit by said entrance/exit sensor to determine whether there is an intruding motion occurred at said entrance/exit;(c) triggering at least a local warning device of said existing alarm system to generate an alert signal when said entrance/exit sensor detects said intruding motion occurred at said entrance/exit;(d) stopping said alert signal when said intruding motion ceases or terminates; and(e) switching said entrance/exit sensor to a control panel of said existing alarm system when said existing alarm system is in an armed condition, so as to render said entrance/exit sensor performing a normal alarm detecting function thereof, wherein a detecting signal is sent to a security control device connected between a control panel and said entrance/exit sensor of said existing alarm system when said entrance/exit sensor detects said intruding motion occurred at said entrance/exit so as to trigger said local warning device by said security control device to generate said alert signal, wherein said security control device automatically disables functions thereof once said existing alarm system is set to said armed condition, wherein said entrance/exit sensor works normally with said control panel when said existing alarm system is in said armed condition;wherein said security control device comprises:a central processor unit for computation, an input circuit for electrically connecting said entrance/exit sensor of said existing alarm system to said central processor unit,a power supply electrically connected to said central processor unit for providing electrical power to said central processor unit,a time count generator electrically connected to said central processor unit for generating counter signals for controlling a predetermined period of time for said alert signal,an alarm output for connecting to said local warning device for generating said alert signal, an output circuit for electrically connecting said central processor unit with said control panel of said existing alarm system,a PG selector which is a switch circuit for setting said central processor unit to select and program time period and function, anda status controlling circuit for determining whether said existing alarm system is armed or disarmed,wherein when said existing alarm system is armed, said PG selector bypasses said detecting signal sent from said entrance/exit sensor directly to said control panel of said existing alarm system to function normally, and when said existing alarm system is disarmed, said detecting signal sent from said entrance/exit sensor is input into said central processor unit of said security control device, wherein said central processor unit triggers said alarm output to generate said alert signal.