US4550311A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Remote sensing systems
Assignee: KGS Fire & Security UK Ltd
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Filing: 1983-12-01
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Granted: 1985-10-29
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Expires: 2003-12-01
Abstract
Abstract A security installation at one Site has remote sensors which detect intrusion, fire, etc. and transmit corresponding signals by radio to a master station. Similar installations are provided at other Sites. The sensors of each Site precede their data signals with an access code which is particular to that Site and prevents their signals being received by the master station of any adjacent Site within radio range. When a new installation is to be installed at a new, adjacent Site, an arbitrary value is initially selected for its access code and the master station there transmits a special code to all adjacent Sites. In response to this special code, the master station in each such adjacent Site transmits its own access code back to the new installation, where it is compared in value with the arbitrarily selected access code. The latter is automatically changed until it becomes different from that of any and all adjacent Sites. The remote sensors of the new installation are then set to this value.
Inventors
- 👤 John L. Galloway
- 👤 Timothy R. F. Hankins
- 👤 Ian A. Owers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:54
CPC Classifications
G; G08; G08B; G08B25/00; G08B25/01; G08B25/10; G08B26/00; G08B26/007; G08B25/007
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
156 words
A remote sensing system, in which a first group of remote units are associated with a master station for transmitting information to that master station and are for installation within reception range of one or more other master stations each having associated therewith a respective further group of remote units, each remote unit of each such further group transmitting information to its respective master station, the information transmitted by the remote units of each said further group being identified with a respective access code which is recognizable only by the master station associated with those remote units, the system including monitoring means connected to the first master station and operative to cause the access code applicable to each of the said further groups to be monitored by radio, and selecting means connected to the monitoring means and responsive to the monitored access codes for selecting a different value of access code for the first master station.
Claim 2
Dependent Claim
156 words
A remote sensing system, in which a first group of remote units are associated with a master station for transmitting information to that master station and are for installation within reception range of one or more other master stations each having associated therewith a respective further group of remote units, each remote unit of each such further group transmitting information to its respective master station, the information transmitted by the remote units of each said further group being identified with a respective access code which is recognizable only by the master station associated with those remote units, the system including monitoring means connected to the first master station and operative to cause the access code applicable to each of the said further groups to be monitored by radio, and selecting means connected to the monitoring means and responsive to the monitored access codes for selecting a different value of access code for the first master station.
Claim 3
Dependent Claim
58 words
A system according to claim 1, in which the monitoring means comprises system code transmitting means operative to transmit to all master stations within reception range a system code which is recognisable by all those master stations, and means within each master station for detecting the system code and responding thereto by transmitting back its own access code.
Claim 4
Dependent Claim
30 words
A system according to claim 2, in which the selecting means comprises means for sensing all the transmitted-back access codes and selecting a different code for the first-mentioned master station.
Claim 5
Dependent Claim
43 words
A system according to claim 1, in which each master station includes timing means responsive to receipt of the system code for causing the transmission back of its own access code at a predetermined time which is different for each such master station.
Claim 6
Dependent Claim
69 words
A system according to claim 1, in which the monitoring means comprises transmitting means operative to transmit to all master stations within reception range a code representing a current value selected for the access code for the first-mentioned master station, and means within each master station receiving that code to transmit back a recognition signal indicating if its own access code is the same as the said current value.
Claim 7
Dependent Claim
39 words
A system according to claim 5, in which the selecting means comprises means for responding to the or each such recognition signal by changing the current value to a different current value, and means for re-operating the monitoring means.
Claim 8
Dependent Claim
23 words
A system according to claim 1, in which the said transmitting means of the monitoring means is situated within the first-mentioned master station.
Claim 9
Independent Claim
91 words
A method of preventing interference between adjacent installations each comprising a respective group of remote stations which transmit information to a respective master station by means of signals which are identified by an access code, comprising the steps of causing the access codes of all installations within reception range of the location of a proposed new installation to be automatically monitored, and sensing the monitored access codes and responding thereto by automatically selecting for the proposed new installation a value of access code which is different from the monitored access codes.
Claim 10
Independent Claim
91 words
A method of preventing interference between adjacent installations each comprising a respective group of remote stations which transmit information to a respective master station by means of signals which are identified by an access code, comprising the steps of causing the access codes of all installations within reception range of the location of a proposed new installation to be automatically monitored, and sensing the monitored access codes and responding thereto by automatically selecting for the proposed new installation a value of access code which is different from the monitored access codes.
Claim 11
Dependent Claim
52 words
A method according to claim 8, in which the monitoring step comprises the step of transmitting from the said location a system code which is recognisable by the master stations of all the adjacent installations and which causes them to transmit their access codes back to the said location for monitoring there.
Claim 12
Dependent Claim
58 words
A method according to claim 9, in which the selecting step includes the steps of arbitrarily choosing an initial value for the access code of the proposed new installation, comparing this arbitrarily selected value with the values of the transmitted-back access codes, and changing the arbitrarily selected value until it is different from all the transmitted-back access codes.
Claim 13
Dependent Claim
33 words
A method according to claim 9, in which the selecting step includes storing all the transmitted-back access codes, and selecting a value of access code which is different from the stored access codes.
Claim 14
Dependent Claim
66 words
A method according to claim 8, in which the said monitoring step comprises the steps of transmitting from the said location a code representing a current value selected for the access code for the proposed new installation, determining at each master station whether the access code thereof is the same as the said current value and, if so, transmitting information accordingly back to the said location.
Claim 15
Dependent Claim
38 words
A method according to claim 12, in which the selecting step comprises the step of responding to the said transmitted information by changing the said current value to a different current value and repeating the said monitoring step.
Claim 16
Dependent Claim
16 words
A method according to claim 8, in which the mode of transmission used is radio transmission.
Claim 17
Dependent Claim
18 words
A method according to claim 8, in which the mode of transmission is by means of infra-red radiation.
Claim 18
Dependent Claim
18 words
A method according to claim 8, in which the mode of transmission is by means of wired links.
Claim 19
Dependent Claim
28 words
A method according to claim 16, in which the wired links are formed by an AC mains system, that is where transmission is via the power supply means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-10-28 | 1989-04-29 | 1989-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-28 | 1993-04-29 | 1993-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-28 | 1997-04-29 | 1997-10-29 | $7700.00 | Window Closed / Lapsed |