High throughput embedded code hopping system with bypass mode

• US 5,798,711 A
• Filed: 06/02/1995
• Issued: 08/25/1998
• Est. Priority Date: 05/22/1992
• Status: Expired due to Term

• Current Assignee: Directed, LLC (VOXX International Corporation)
• Original Assignee: DEI Holdings Incorporated
• Inventors: Chen, Charles, Birchfield, Jerry W., Issa, Darrell E.
• Primary Examiner(s): Horabik, Michael
• Assistant Examiner(s): WILSON JR, WILLIAM HALL
• Application Number:
  US08/460,106
• Time in Patent Office: 1,180 Days
• Field of Search: 340/825.3, 340/825.31, 340/825.34, 340/825.56, 340/825.69, 340/825.72, 380/23, 380/28, 375/354, 375/369
• US Class Current: 340/5.26
• CPC Class Codes: B60R 25/1003 Alarm systems characterised by arm or disarm features
• CPC Class Codes: B60R 25/1004 Alarm systems characterised by the type of sensor, e.g. current sensing means using door lock sensors B60R25/1001
• CPC Class Codes: B60R 25/1018 Alarm systems characterised by features related to the general power supply
• CPC Class Codes: B60R 25/104 characterised by the type of theft warning signal, e.g. visual or audible signals with special characteristics
• CPC Class Codes: B60R 25/24 using electronic identifiers containing a code not memorised by the user
• CPC Class Codes: G07C 2009/00238 the transmittted data signal containing a code which is changed
• CPC Class Codes: G07C 2009/00793 by Hertzian waves
• CPC Class Codes: G07C 2009/00849 programming by learning
• CPC Class Codes: G07C 9/00182 operated with unidirectional data transmission between data carrier and locks
• CPC Class Codes: G07C 9/21 having a variable access code
• CPC Class Codes: G07C 9/28 the pass enabling tracking or indicating presence
• CPC Class Codes: G08B 25/007 Details of data content structure of message packets; data protocols
• CPC Class Codes: G08B 25/10 using wireless transmission systems G08B25/009 takes precedence
• CPC Class Codes: G08B 29/24 Self-calibration, e.g. compensating for environmental drift or ageing of components
• CPC Class Codes: G08B 29/26 by updating and storing reference thresholds
• CPC Class Codes: G08C 17/02 using a radio link
• CPC Class Codes: G08C 19/22 by varying the duration of individual pulses
• CPC Class Codes: G08C 19/28 using pulse code
• CPC Class Codes: G08C 2201/51 Remote controlling of devices based on replies, status thereof
• CPC Class Codes: G08C 2201/62 Rolling code
• CPC Class Codes: H04J 13/0074 : Code shifting or hopping

Abstract

A system for monitoring and controlling an area comprising a controller for controlling system operational functions; at least one remote control transmitter for transmitting at least one system command to said controller in a code word having a fixed word and a hopping word therein; the fixed word having an identification code for selective control of the controller, the identification code programmed therein, and a channel code for issuing high and low security commands to the controller; a hopping algorithm for modifying the hopping code of the transmitter n-times in response to n-times activation of said transmitter and for modifying the hopping word m-times within the controller upon receipt of the code word m-times from said transmitter; and, a bypass mode for bypassing the code hopping algorithm and for controlling system functions in response to the controller receiving the low security command.

Claims

1. A system for monitoring and controlling an area comprising:

a) a controller for controlling system operational functions;

b) at least one remote control transmitter for transmitting at least one system command to said controller in a code word having at least one fixed position word and at least one hopping word therein;

c) said fixed position word having an identification code for control of said controller, said identification code programmed in said controller, and a channel code for issuing high and low security commands to said controller;

d) a hopping algorithm for modifying said hopping code of said transmitter n-times in response to n-times activation of said transmitter and for modifying said hopping word m-times within said controller upon receipt of said code word times from said transmitter; and

,

e) a bypass mode for bypassing said code hopping algorithm and for controlling said system functions in response to said controller receiving said low security command.

2. The device of claim 1 wherein said bypass mode further includes a timed mode for controlling said system functions upon receipt of said low security command by said controller for at least a predetermined amount of time.

3. The device of claim 2 wherein said predetermined amount of time is at least 0.5 seconds.

4. The device of claim 1 further including a panic mode for generating a full response alarm, said panic mode issued by said low security command.

5. The device of claim 4 further including a timed mode for controlling said system functions upon receipt of said low security command by said controller for at least a predetermined amount of time such that said controller issues said full response alarm after receiving said low security command for at least said predetermined amount of time.

6. The device of claim 1 wherein said bypass mode further includes a check mode for controlling said system functions upon receipt of said low security check mode command by said controller at least a predetermined number of times.

7. The device of claim 6 wherein said predetermined number of times is at least one.

8. The device of claim 6 further including a check mode for controlling said system functions upon receipt of said low security command by said controller a predetermined number of times such that said controller issues said full response alarm after receiving said low security command for at least said predetermined number of times.

9. A system for monitoring and controlling an area comprising:

a) a controller for controlling system operational functions;

b) at least one remote control transmitter for transmitting at least one system command to said controller in a code word having a fixed position word and a hopping word therein;

c) said fixed position word having an identification code for control of said controller, said identification code programmed in said controller, and a channel code for issuing high and low security commands to said controller;

d) a hopping algorithm for modifying said hopping code of said transmitter n-times in response to n-times activation of said transmitter and for modifying said hopping word m-times within said controller upon receipt of said code word times from said transmitter; and

,

e) a bypass mode for bypassing said code hopping algorithm and for controlling said system functions in response to said controller receiving said low security command, after verification of said hopping code using said hopping algorithm at least one time.

10. The device of claim 9 wherein said bypass mode further includes a timed mode for controlling said system functions upon receipt of said low security command by said controller for at least a predetermined amount of time.

11. The device of claim 10 wherein said predetermined amount of time is at least 0.5 seconds.

12. The device of claim 9 further including a panic mode for generating a full response alarm, said panic mode issued by said low security command.

13. The device of claim 12 further including a timed mode for controlling said system functions upon receipt of said low security command by said controller for at least a predetermined amount of time such that said controller issues said full response alarm after receiving said low security command for at least said predetermined amount of time.

14. The device of claim 12 further including a check mode for controlling said system functions upon receipt of said low security command by said controller a predetermined number of times such that said controller issues said full response alarm after receiving said low security command for at least said predetermined number of times.

15. The device of claim 9 wherein said bypass mode further includes a check mode for controlling said system functions upon receipt of said low security check mode command by said controller at least a predetermined number of times.

16. A The device of claim 15 herein said predetermined number of times is at least one.

17. Method of transmitting system commands, in a code word having a fixed code and a hopping code and having low security and high security commands, from a remote control transmitter to a system controller responsive thereto, comprising the steps of:

a) encoding a fixed position word within a transmitter having an identification code and a channel code therein, said channel code providing system operational function commands to a system controller;

b) programming said identification code within said controller;

c) assigning a high security or a low security to said channel code;

d) programming a hopping algorithm into said transmitter and said controller, each having a 0-times modified initial hopping word therein;

e) modifying said initial hopping word n-times with said hopping algorithm in response to n-times activation of said transmitter;

f) encoding a code word having said fixed position word and said n-times modified hopping word therein;

g) transmitting said code word to said controller;

h) said controller receiving said code word;

i) said controller responding to said code word having said identification code programmed therein;

j) said controller decoding said channel code and determining whether it is said high security or said low security code;

k) said controller modifying said initial hopping word m-times in response to receiving said high security code with said hopping algorithm in response to n-times activation of said transmitter;

l) said controller executing said commands if said n-times modified hopping word received from said transmitter matches said m-times hopping word decoded by said controller; and

,

m) said controller bypassing said step of modifying said initial hopping word in response to said low security channel identification code and executing said command of said channel code.

18. The method of claim 17 further including a step executing said command of said low security channel code if said code word is transmitted for at least a predetermined amount of time.

19. The method of claim 18 further including the step of entering into a panic mode and issuing a full alarm in response to receiving said low security channel code for at 4 least said predetermined amount of time.

20. The method of claim 18 wherein said predetermined amount of time is at least 0.5 seconds.

21. The method of claim 17 further including a step executing said command of said low security channel code if said code word is transmitted at least a predetermined number of times.

22. The method of claim 21 further including the step of entering a panic mode and issuing a full alarm in response to receiving said low security channel code at least said predetermined number of times.

23. The method of claim 22 wherein said predetermined amount of times is at least one.

24. Method of transmitting system commands, in a code word having a fixed code and a hopping code and having low security and high security commands, from a remote control transmitter to a system responsive thereto, comprising the steps of:

a) encoding a fixed position word within a transmitter having an identification code and a channel code therein, said channel code providing system operational function commands to a system controller;

b) programming said identification code within said controller;

c) assigning a high security or a low security to said channel code;

d) programming a hopping algorithm into said transmitter and said controller, each having a 0-times modified initial hopping word therein;

e) modifying said initial hopping word n-times with said hopping algorithm in response to n-times activation of said transmitter;

f) encoding a code word having said fixed position word and said n-times modified hopping word therein;

g) transmitting said code word to said controller;

h) said controller receiving said code word;

i) said controller responding to said code word having said identification code programmed therein;

i) said controller decoding said channel code and determining whether it is said high security or said low security code;

k) said controller modifying said initial hopping word m-times in response to receiving said high security code with said hopping algorithm in response to n-times activation of said transmitter;

l) said controller executing said commands if said n-times modified hopping word received from said transmitter matches said m-times hopping word decoded by said controller; and

,

m) verifying said hopping code using said hopping algorithm at least one time and thereafter bypassing said step of verifying said hopping word in response to said low security channel code and executing said command of said channel code.

25. The method of claim 24 further including a step executing said command of said low security channel code if said code word is transmitted for at least a predetermined amount of time.

26. The method of claim 25 further including the step of entering a panic mode and issuing a full alarm in response to receiving said low security channel code for at least said predetermined amount of time.

27. The method of claim 25 wherein said predetermined amount of time is at least 0.5 seconds.

28. The method of claim 24 further including a step executing said command of said low security channel code if said code word is transmitted at least a predetermined number of times.

29. The method of claim 28 further including the step of entering into a panic mode and issuing a full alarm in response to receiving said low security channel code for at least said predetermined number of times.

30. The method of claim 29 wherein said predetermined number of times is at least one.