Alarm control center

• US 4,339,746 A
• Filed: 11/14/1980
• Issued: 07/13/1982
• Est. Priority Date: 11/14/1980
• Status: Expired due to Term

• Current Assignee: US Philips Corporation (Koninklijke Philips N.V.)
• Original Assignee: US Philips Corporation (Koninklijke Philips N.V.)
• Inventors: Ulicki, Edward M., Schlisser, Gabor
• Primary Examiner(s): Waring, Alvin H.
• Application Number:
  US06/206,928
• Time in Patent Office: 606 Days
• Field of Search: 340/506, 340/517, 340/518, 340/521, 340/524, 340/531, 340/533, 340/537, 340/539
• US Class Current: 340/518
• CPC Class Codes: G08B 26/008 central annunciator means of the sensed conditions, e.g. displaying or registering

Abstract

An alarm control center having means for interchangeably assigning alarm parameters for each sensor loop in an array of sensor loops and for interchangeably assigning alarm outputs for each of the sensor loops. When the alarm control center senses an alarm condition on one of the sensor loops, the alarm control center increases the scanning rate for that particular sensor loop to verify the alarm condition.

Claims

1. An alarm control center for interfacing with an array of input sensor loops, each of said loops having a plurality of sensors each arranged to vary in resistance indicating whether, for example, windows and doors are open, or the presence of smoke or fire, and an array of alarm outputs including, for example, sirens, automatic telephone dialers, local audio buzzers and displays, said alarm control center comprising:

means for interchangeably preassigning alarm parameters for each of said input sensor loops;

means for interchangeably preassigning alarm outputs for each of said input sensor loops;

means for sequentially scanning said array of input sensor loops;

means for conditioning the signals received from each of the scanned sensor loops;

means for comparing the signal from each particular scanned input sensor loop with the respective preassigned alarm parameters; and

means for activating the appropriate alarm outputs when said comparing means indicates an alarm condition in the signal corresponding to the respective input sensor loop.

2. An alarm control center as claimed in claim 1 which further comprises means for facilitating the remote controlling of said alarm control center whereby said scanning means, said comparing means and said alarm activation means may be remotedly controlled.

3. An alarm control center as claimed in claim 1 which further comprises means for selectively effecting a day mode of operation, wherein certain of said input sensor loops and alarm outputs are inhibited, and a night mode of operation, wherein all of said sensor loops and alarm outputs are operational, and means for automatically preventing the switching from one mode to the other when alarm conditions exist.

4. An alarm control center as claimed in claims 1 or 2 which further comprises remote means for operating said alarm control center including remote activation/deactivation units.

5. An alarm control center as claimed in claim 1, wherein the scanning rate of a particular sensor loop by said scanning means may be selectively increased to verify the occurrence of an alarm condition in said sensor loop.

6. An alarm control center as claimed in claim 4, which further comprises battery means for powering said alarm control center in the event of power outages.

7. An alarm control center as claimed in claim 6, which further comprises means for switching on and off said remote operating means to extend battery operation time.

8. An alarm control center as claimed in claim 6, which further comprises means for sensing the condition of said battery means and for suspending the operation of said alarm control center to prevent excessive discharge of said battery means.