US4507652A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bidirectional, interactive fire detection system
Assignee: ADT Security Services LLC
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Filing: 1984-03-15
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Granted: 1985-03-26
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Expires: 2004-03-15
Abstract
Abstract A Communication System useful for fire detection which transfers data/commands bidirectionally between a controller and connected transponders on a real time, interactive basis. This system makes possible accurate data recovery, whether a transponder has its output shorted, or although multiple transponders are replying and makes possible the remote determination and constant monitoring of transducer sensitivity, at the controller. The sensitivity can be adjusted remotely at the controller, and different transducers can have different thresholds simultaneously, which can be changed collectively or individually to different settings manually or automatically at the controller. The system transmits reference data for supervision of system accuracy. Compensation for long-term changes is provided for both transponders and transducers in this system.
Inventors
- 👤 William R. Vogt
- 👤 John M. Wynne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:42
CPC Classifications
G; G08; G08B; G08B25/00; G08B25/01; G08B25/04; G08B17/00
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
122 words
A fire detection system comprising a pair of electrical conductors, a controller connected to transmit data over the electrical conductors, a plurality of transponders coupled to said conductors, at least one of said transponders having means for returning other data to the controller, and a transducer coupled to the transponder returning data, which transponder includes means for returning said data as a function of the transducer response, and in which the controller includes means for storing a first data signal denoting transducer response data from the transponder, a subsequent data signal provides later transducer response information, and means is connected to compare the subsequent data signal against the first data signal, to provide a transducer compensation signal for use in the system.
Claim 2
Dependent Claim
122 words
A fire detection system comprising a pair of electrical conductors, a controller connected to transmit data over the electrical conductors, a plurality of transponders coupled to said conductors, at least one of said transponders having means for returning other data to the controller, and a transducer coupled to the transponder returning data, which transponder includes means for returning said data as a function of the transducer response, and in which the controller includes means for storing a first data signal denoting transducer response data from the transponder, a subsequent data signal provides later transducer response information, and means is connected to compare the subsequent data signal against the first data signal, to provide a transducer compensation signal for use in the system.
Claim 3
Dependent Claim
53 words
A fire detection system as claimed in claim 1, in which a comparator stage is connected to provide a maintenance-desired signal when the amplitude of the transducer compensation signal reaches a preset level, thus automatically requesting maintenance for conditions such as dust accumulation on the transducer before an erroneous alarm can be initiated.
Claim 4
Dependent Claim
123 words
A fire detection system comprising a pair of electrical conductors, a controller connected to transmit data over the electrical conductors, a plurality of transponders coupled to said conductors for returning data to the controller, and a transducer coupled to one of the transponders, which transponder includes means for returning said data as a function of the transducer response, and in which the controller includes means for storing a limit signal, means for receiving a data signal denoting transducer response from the transponder, and means connected to compare the data signal against the limit signal, to provide a transducer sensitivity signal as represented by the difference between the limit signal for the particular transducer and the transducer response information provided by the data signal.
Claim 5
Dependent Claim
123 words
A fire detection system comprising a pair of electrical conductors, a controller connected to transmit data over the electrical conductors, a plurality of transponders coupled to said conductors for returning data to the controller, and a transducer coupled to one of the transponders, which transponder includes means for returning said data as a function of the transducer response, and in which the controller includes means for storing a limit signal, means for receiving a data signal denoting transducer response from the transponder, and means connected to compare the data signal against the limit signal, to provide a transducer sensitivity signal as represented by the difference between the limit signal for the particular transducer and the transducer response information provided by the data signal.
Claim 6
Dependent Claim
46 words
A fire detection system as claimed in claim 3, in which a plurality of transducers are respectively coupled to the individual transponders, and the sensitivity of all transducers is continually monitored, so that the alarm and trouble conditions for each transducer are determined at the controller.
Claim 7
Dependent Claim
44 words
A fire detection system as claimed in claim 3, in which said controller comprises means for adjusting said limit signal to provide adjustable sensitivity of the transducer, even though the transducer may be coupled to said conductors at a location remote from said controller.
Claim 8
Dependent Claim
20 words
A fire detection system as claimed in claim 3, in which said controller provides multiple limits for a given transducer.
Claim 9
Dependent Claim
21 words
A fire detection system as claimed in claim 5, in which the sensitivity is controlled constantly and automatically at the controller.
Claim 10
Dependent Claim
25 words
A fire detection system as claimed in claim 7, which a memory is provided in the controller to store a program for controlling the sensitivity.
Claim 11
Dependent Claim
24 words
A fire detection system as claimed in claim 4, in which means is provided for the selective change of the sensitivity of any transducer.
Claim 12
Dependent Claim
21 words
A fire detect ion system as claimed in claim 9 in which a keyboard is utilized in the selective sensitivity change.
Claim 13
Dependent Claim
139 words
A communication system comprising a pair of electrical conductors, a controller connected to transmit data over the electrical conductors, a plurality of transponders coupled to said conductors, at least one of said transponders having means for returning other data to the controller, and a plurality of transducers respectively coupled to the transponders for returning data, which transponders include means for returning said data as a function of each transducer response, and in which the controller obtains compensation data by originally polling the transponders at a controlled time when the supervised premises are in a desired state, such as a low-occupancy, quiescent condition, subsequently polling the transponders when the supervised premises are in a similar state, and using a comparison of data from the latest poll and at least one earlier poll to compensate the system for long-term component changes.
Claim 14
Dependent Claim
139 words
A communication system comprising a pair of electrical conductors, a controller connected to transmit data over the electrical conductors, a plurality of transponders coupled to said conductors, at least one of said transponders having means for returning other data to the controller, and a plurality of transducers respectively coupled to the transponders for returning data, which transponders include means for returning said data as a function of each transducer response, and in which the controller obtains compensation data by originally polling the transponders at a controlled time when the supervised premises are in a desired state, such as a low-occupancy, quiescent condition, subsequently polling the transponders when the supervised premises are in a similar state, and using a comparison of data from the latest poll and at least one earlier poll to compensate the system for long-term component changes.
Claim 15
Dependent Claim
80 words
A communication system comprising a pair of electrical conductors, a controller connected to transmit data over the electrical conductors, a plurality of transponders coupled to said conductors, at least one of said transponders having means for returning other data to the controller, which transponder includes means for returning said data as a function of calibration response information, and the controller includes means for receiving the data denoting calibration response of the replying transponder to indicate accuracy of the system circuitry.
Claim 16
Dependent Claim
80 words
A communication system comprising a pair of electrical conductors, a controller connected to transmit data over the electrical conductors, a plurality of transponders coupled to said conductors, at least one of said transponders having means for returning other data to the controller, which transponder includes means for returning said data as a function of calibration response information, and the controller includes means for receiving the data denoting calibration response of the replying transponder to indicate accuracy of the system circuitry.
Claim 17
Dependent Claim
29 words
A communication system as claimed in claim 12 in which the controller continually supervises all the transponders in the system by monitoring the calibration response information from all transponders.
Claim 18
Dependent Claim
46 words
A communication system as claimed in claim 12, and further comprising means in the controller for storing calibration response information and summation means for utilizing subsequent data in comparison with the stored calibration response information to provide a transponder compensation signal for use in the system.
Claim 19
Dependent Claim
35 words
A communication system as claimed in claim 14, and further comprising a comparator, coupled to the summation means, for providing an output signal when the magnitude of the transponder compensation signal exceeds a preset level.
Claim 20
Dependent Claim
129 words
A communication system comprising a pair of electrical conductors, a controller connected to transmit data over the electrical conductors, a plurality of transponders coupled to said conductors, at least one of said transponders having means for returning other data to the controller, which transponder includes means for returning said data as a function of calibration response information, and the controller includes means for receiving the data denoting calibration response of the replying transponder to indicate accuracy of the system circuitry, in which the replying transponder includes an indicator, and means in the controller for recognizing when a returned calibration response signal is within preset limits and, upon such recognition, for actuating said indicator to verify that the calibration response signal from said one transponder is within said preset limits.
Claim 21
Dependent Claim
129 words
A communication system comprising a pair of electrical conductors, a controller connected to transmit data over the electrical conductors, a plurality of transponders coupled to said conductors, at least one of said transponders having means for returning other data to the controller, which transponder includes means for returning said data as a function of calibration response information, and the controller includes means for receiving the data denoting calibration response of the replying transponder to indicate accuracy of the system circuitry, in which the replying transponder includes an indicator, and means in the controller for recognizing when a returned calibration response signal is within preset limits and, upon such recognition, for actuating said indicator to verify that the calibration response signal from said one transponder is within said preset limits.
Claim 22
Dependent Claim
56 words
A communication system as claimed in claim 16, wherein said one transponder includes an adjustable component connected to effect a variation in said calibration response signal, thus allowing modification of the calibration response signal at the transponder until the signal is within the preset limits, as signalled by actuation of the indicator at said one transponder.
Claim 23
Dependent Claim
71 words
A communication system comprising a pair of electrical conductors, a controller connected to transmit data over the electrical conductors, a plurality of transponders coupled to said conductors, each of said transponders having output switch means operable to return other data to the controller, and characterized in that although a non-selected transponder has its output switch means shorted, the controller is nevertheless capable of recovering the data returned by the replying transponder.
Claim 24
Dependent Claim
71 words
A communication system comprising a pair of electrical conductors, a controller connected to transmit data over the electrical conductors, a plurality of transponders coupled to said conductors, each of said transponders having output switch means operable to return other data to the controller, and characterized in that although a non-selected transponder has its output switch means shorted, the controller is nevertheless capable of recovering the data returned by the replying transponder.
Claim 25
Dependent Claim
74 words
A communication system comprising a pair of electrical conductors, a controller connected to transmit data over the electrical conductors, a plurality of transponders coupled to said conductors, each of said transponders having outpout switch means operable to return other data to the controller, and characterized in that althohgh: a non-selected transponder is replying simultaneously with a selected transponder, the controller has means for recovering the data returned from both the non-selected and selected transponders.
Claim 26
Dependent Claim
74 words
A communication system comprising a pair of electrical conductors, a controller connected to transmit data over the electrical conductors, a plurality of transponders coupled to said conductors, each of said transponders having outpout switch means operable to return other data to the controller, and characterized in that althohgh: a non-selected transponder is replying simultaneously with a selected transponder, the controller has means for recovering the data returned from both the non-selected and selected transponders.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-03-25 | 1988-09-24 | 1989-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-25 | 1992-09-24 | 1993-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-25 | 1996-09-24 | 1997-03-26 | $7700.00 | Window Closed / Lapsed |