PASSIVE DISARMING TRANSCEIVER FOR SECURITY SYSTEMS

• US 20080055040A1
• Filed: 08/28/2007
• Published: 03/06/2008
• Est. Priority Date: 08/29/2006
• Status: Abandoned Application

• Current Assignee: Honeywell International Inc.
• Original Assignee: Honeywell International Inc.
• Inventors: Lizza, Alfred, Tyroler, Dan, Eskildsen, Kenneth
• Application Number:
  US11/846,173
• Publication Number:
  US 20080055040A1
• Time in Patent Office: Days
• US Class Current: 340/5.7
• CPC Class Codes: G07C 9/28 the pass enabling tracking or indicating presence

Abstract

A method of disarming an alarm system in a premises by detecting motion of at least part of a door in the premises to trigger generation of a challenge signal; transmitting the challenge signal; receiving a response signal from an associated disarm device such as a keyfob; determining if the response signal is valid as having been generated by an authorized disarm device; and if the response signal is valid, then transmitting a disarm message effective to cause the alarm system to become disarmed.

Claims

1. A method of disarming an alarm system in a premises comprising:

a) detecting motion of at least part of a door in the premises to trigger generation of a challenge signal;

b) transmitting the challenge signal;

c) receiving a response signal;

d) determining if the response signal is valid as having been generated by an authorized disarm device; and

e) if the response signal is valid, then transmitting a disarm message effective to cause the alarm system to become disarmed.

2. The method of claim 1 further comprising

f) if the response signal is not valid, then transmitting an alarm message effective to cause the alarm system to generate an alarm.

3. The method of claim 1 further comprising

f) if no valid response signal is received after a predetermined time has elapsed, then transmitting an alarm message effective to cause the alarm system to generate an alarm.

4. The method of claim 1 wherein detecting motion of at least part of a door in the premises comprises detecting said motion with an accelerometer device mounted in the door.

5. The method of claim 1 wherein detecting motion of at least part of a door in the premises comprises detecting if the door has been at least partially opened with a door contact switch.

6. The method of claim 1 wherein detecting motion of at least part of a door in the premises comprises detecting if a lock mechanism mounted in the door has been retracted from a locked position.

7. The method of claim 1 wherein determining if the response signal is valid as having been generated by an authorized disarm device comprises

(i) extracting response data from the response signal;

(ii) comparing the extracted response data with at least one entry in a previously stored lookup table; and

(iii) declaring the response signal to be valid if the extracted response data matches at least one entry in the previously stored lookup table.

8. The method of claim 1 wherein determining if the response signal is valid as having been generated by an authorized disarm device comprises

(i) extracting response data from the response signal;

(ii) performing an algorithm on the extracted response data to generate an algorithm result; and

(iii) declaring the response signal to be valid if the algorithm result is true.

9. A device for passively disarming an alarm system comprising:

a) a portable wireless disarm device comprising processing circuitry adapted to transmit a response signal on receipt of a challenge signal; and

b) a door-mounted controller, comprising;

i) a door motion detector that generates a trigger signal on detecting motion of a door to which the door-mounted controller is mounted; and

ii) a processing unit coupled to the door motion detector that;

wirelessly transmits a challenge signal as a result of the trigger signal from the door motion detector,

receives a response signal from the disarm device,

determines if the response signal is valid; and

if the response signal is valid, generates and transmits a disarm message effective to cause the alarm system to become disarmed.

10. The device of claim 9 wherein, if the response signal is not valid, the processing unit is further adapted to transmit an alarm message effective to cause the alarm system to generate an alarm.

11. The device of claim 9 wherein, if no valid response signal is received after a predetermined time has elapsed, the processing unit is further adapted to transmit an alarm message effective to cause the alarm system to generate an alarm.

12. The device of claim 9 wherein the door motion detector is an accelerometer.

13. The device of claim 9 wherein the door motion detector is a door contact switch.

14. The device of claim 9 wherein the door motion detector is a lock position detector.

15. The device of claim 9 wherein the processing unit determines if the response signal is valid by:

(i) extracting response data from the response signal;

(ii) comparing the extracted response data with at least one entry in a previously stored lookup table; and

(iii) declaring the response signal to be valid if the extracted response data matches at least one entry in the previously stored lookup table.

16. The device of claim 9 wherein the processing unit determines if the response signal is valid by:

(i) extracting response data from the response signal;

(ii) performing an algorithm on the extracted response data to generate an algorithm result; and

(iii) declaring the response signal to be valid if the algorithm result is true.

18. The device of claim 9 wherein the door-mounted controller is mounted in a housing adapted to be mounted on the outside of a door.

17. A processing unit for passively disarming an alarm system, the processing unit adapted to interface to an external door motion detector that generates a trigger signal on detecting motion of a door to which the door-mounted controller is mounted, wherein the processing unit is configured to:

wirelessly transmit a challenge signal as a result of the trigger signal from the door motion detector,

receive a response signal from an external disarm device,

determine if the response signal is valid; and

generate and transmit a disarm message effective to cause the alarm system to become disarmed.