US3697984A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Computer-alarm interface system
Assignee: CLENDENIN INVENTORS Ltd PARTNE
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Filing: 1969-05-23
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Granted: 1972-10-10
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Expires: 1989-05-23
Abstract
Abstract A computer-alarm interface system interconnects conventional leased telephone line, polarity reversal alarms at multiple protected premises to a digital computer. The system, installed to function with a time-sharing computer equipped for communications, notifies police for other appropriate authorities of the nature and location of an alarm, trouble or tamper condition. Each protected premises is associated with a respective module at a central station which registers normal, alarm, or telephone line trouble conditions at the premises, and optionally provides tamper protection. The modules are continuously monitored for changes in conditions at their associated protected premises and transmit coded information pertaining to the nature and location of these changes to the computer. The latter provides a written record of this information at the office of the appropriate authority and also checks the alarm system to assure that the information received by the computer is correct. A tamper-protection circuit employed with or without the computer includes a code tone or pulse transponder located at the protected premises and selectively triggered by an interrogation code tone or pulse from the module. Failure to receive the specified code tone or pulse over the telephone lines when triggered from the module location signifies tampering at the protected premises. Another feature of the system is the provision of circuitry at the module location which permits condition indicators or lamps to have two active states: in one state the condition is indicated as not having been reported to the authorities; in the second state the condition is indicated as persisting but having been reported.
Inventors
- 👤 Roger F Atkinson
- 👤 Richard H Parr Jr
- 👤 Edward A Weil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:26
CPC Classifications
G; G08; G08B; G08B29/00; G08B29/02; G08B29/06; G08B29/08
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
568 words
A system for providing interface functions between a computer interface, which services a computer capable of providing alphanumeric readout information at remote locations corresponding to received coded information, and a central station alarm network having a multiplicity of diversely located alarm-protected premises, each of said premises being capable of assuming a plurality of alternative conditions and providing a condition signal indicative of the existing premises condition, said system comprising: a multiplicity of control circuits, one each for monitoring the condition of a respective one of said premises and each being adapted to receive the condition signals provided by its monitored premises; actuable scanner means for applying trigger signals to all of said control circuits individually in accordance with a predetermined sequence; and counting means for providing a sequentially changing coded signal to said computer interface identifying each of said control circuits as they receive a trigger signal from said scanner means; wherein said control circuits each include: resettable logic means responsive to said condition signal provided by said monitored premises for registering the occurrence and nature of condition changes at said monitored premises, and for providing a status signal to said computer interface indicating the nature of the existing condition at said monitored premises; triggerable gating means responsive to condition changes registered at said logic means and a trigger signal from said scanner means for providing a control signal to said scanner means to deactuate said scanner means at a point in said predetermined sequence at which said coded signal identifies the control circuit from which said control signal originates, said control signal also being provided to said computer interface as an indication that said status signal originates from the control circuit which is identified by said coded signal; wherein said computer is programmed to provide a status reply signal and a coded reply signal to said system after said computer has processed said status signal and said coded signal, and has delivered said alpha-numeric information, said coded reply signal identifying the same control circuit identified by said coded signal and said status reply signal signifying the same premises condition as said status signal, and wherein said system further comprises: decoder means responsive to said coded reply signal for providing a gating signal to the control circuit identified by said coded reply signal; means for applying said status reply signal to all of said control circuits; wherein each of said control circuits include reset means responsive to time coincident application of said gating signal and said status reply signal to the same control circuit for resetting the resettable logic means in that control circuit whereby to de-register any condition change registered by that resettable logic means; said system further comprising a tamper-protection circuit comprising: selectively actuable interrogation means located remote from said protected premises for supplying a coded interrogation signal to different selectable ones of said protected premises; transponder means located at various protected premises and responsive to said coded interrogation signal for generating a coded response signal which uniquely identifies thE premises from which the coded response signal originates; and a plurality of decoding means each responsive to said coded response signal generated at a respective protected premises for providing a first indication when said coded response signal correctly identifies said respective premises upon interrogation by said interrogation signal and for providing a second indication when said coded response signal incorrectly identifies said respective premises upon interrogation.
Claim 2
Independent Claim
568 words
A system for providing interface functions between a computer interface, which services a computer capable of providing alphanumeric readout information at remote locations corresponding to received coded information, and a central station alarm network having a multiplicity of diversely located alarm-protected premises, each of said premises being capable of assuming a plurality of alternative conditions and providing a condition signal indicative of the existing premises condition, said system comprising: a multiplicity of control circuits, one each for monitoring the condition of a respective one of said premises and each being adapted to receive the condition signals provided by its monitored premises; actuable scanner means for applying trigger signals to all of said control circuits individually in accordance with a predetermined sequence; and counting means for providing a sequentially changing coded signal to said computer interface identifying each of said control circuits as they receive a trigger signal from said scanner means; wherein said control circuits each include: resettable logic means responsive to said condition signal provided by said monitored premises for registering the occurrence and nature of condition changes at said monitored premises, and for providing a status signal to said computer interface indicating the nature of the existing condition at said monitored premises; triggerable gating means responsive to condition changes registered at said logic means and a trigger signal from said scanner means for providing a control signal to said scanner means to deactuate said scanner means at a point in said predetermined sequence at which said coded signal identifies the control circuit from which said control signal originates, said control signal also being provided to said computer interface as an indication that said status signal originates from the control circuit which is identified by said coded signal; wherein said computer is programmed to provide a status reply signal and a coded reply signal to said system after said computer has processed said status signal and said coded signal, and has delivered said alpha-numeric information, said coded reply signal identifying the same control circuit identified by said coded signal and said status reply signal signifying the same premises condition as said status signal, and wherein said system further comprises: decoder means responsive to said coded reply signal for providing a gating signal to the control circuit identified by said coded reply signal; means for applying said status reply signal to all of said control circuits; wherein each of said control circuits include reset means responsive to time coincident application of said gating signal and said status reply signal to the same control circuit for resetting the resettable logic means in that control circuit whereby to de-register any condition change registered by that resettable logic means; said system further comprising a tamper-protection circuit comprising: selectively actuable interrogation means located remote from said protected premises for supplying a coded interrogation signal to different selectable ones of said protected premises; transponder means located at various protected premises and responsive to said coded interrogation signal for generating a coded response signal which uniquely identifies thE premises from which the coded response signal originates; and a plurality of decoding means each responsive to said coded response signal generated at a respective protected premises for providing a first indication when said coded response signal correctly identifies said respective premises upon interrogation by said interrogation signal and for providing a second indication when said coded response signal incorrectly identifies said respective premises upon interrogation.
Claim 3
Dependent Claim
68 words
The system according to claim 1 wherein electrical connections are provided between said protected premises and respective control circuits and wherein said second indication serves as an indication that the system has been tampered with at said protected premises, and wherein said resettable logic means additionally includes means for registering tampering indications and for providing a tamper signal to said computer indicating the existence of said tamper condition.
Claim 4
Dependent Claim
96 words
The system according to claim 1 wherein electrical connections are provided between each protected premises and its associated control circuit for conveying said condition signals, said coded interrogation signal, and said coded response signals between said protected premises and said control circuits, and further comprising means for randomly applying simulated coded interrogation signals and simulated coded response signals to said electrical connections in a sequence similar to that in which the true coded interrogation signal and coded response signals occur, said simulated coded interrogation signal having a parameter such that said transponder means is non-responsive thereto.
Claim 5
Dependent Claim
23 words
The system according to claim 3 wherein said simulated coded interrogation signal and simulated coded response signals are provided at randomly varying amplitudes.
Claim 6
Dependent Claim
249 words
In a central station alarm system of the type wherein each one of multiple remotely located protected premises is electrically connected to a respective control circuit located at a central station and supplies to said control circuit an indication of an alarm condition at said premises, an improved alarm indicator circuit comprising: indicator means having an active operational mode and an inactive operational mode; first circuit means responsive to the occurrence of an alarm condition at said premises for alternating said indicator means between said active and inactive modes; reset means for selectively resetting said first circuit means to place said indicator in said active mode; and means responsive to termination of said alarm condition at said premises for placing said indicator means in said inactive mode; said system further comprising a tamper-protection circuit comprising: selectively actuable interrogation means located remote from said protected premises for supplying a coded interrogation signal to different selectable ones of said protected premises; transponder means located at various protected premises and responsive to said coded interrogation signal for generating a coded response signal which uniquely identifies the premises from which the coded response signal originates; and a plurality of decoding means each responsive to said coded response signal generated at a respective protected premises for providing a first indication when said coded response signal correctly identifies said respective premises upon interrogation by said interrogation signal and for providing a second indication when said coded response signal incorrectly identifies said respective premises upon interrogation.
Claim 7
Dependent Claim
249 words
In a central station alarm system of the type wherein each one of multiple remotely located protected premises is electrically connected to a respective control circuit located at a central station and supplies to said control circuit an indication of an alarm condition at said premises, an improved alarm indicator circuit comprising: indicator means having an active operational mode and an inactive operational mode; first circuit means responsive to the occurrence of an alarm condition at said premises for alternating said indicator means between said active and inactive modes; reset means for selectively resetting said first circuit means to place said indicator in said active mode; and means responsive to termination of said alarm condition at said premises for placing said indicator means in said inactive mode; said system further comprising a tamper-protection circuit comprising: selectively actuable interrogation means located remote from said protected premises for supplying a coded interrogation signal to different selectable ones of said protected premises; transponder means located at various protected premises and responsive to said coded interrogation signal for generating a coded response signal which uniquely identifies the premises from which the coded response signal originates; and a plurality of decoding means each responsive to said coded response signal generated at a respective protected premises for providing a first indication when said coded response signal correctly identifies said respective premises upon interrogation by said interrogation signal and for providing a second indication when said coded response signal incorrectly identifies said respective premises upon interrogation.
Claim 8
Dependent Claim
42 words
The system according to claim 5 wherein said second indication indicates that the electrical connections between said protected premises and said control circuits have been tampered with, and wherein said control circuits each additionally monitor tamper conditions at their respective monitored premises.
Claim 9
Dependent Claim
74 words
The system according to claim 6 further comprising means for randomly applying simulated coded interrogation sigNals and simulated coded response signals to said electrical connections in a sequence similar to that in which the true coded interrogation signal and coded response signals occur, said simulated coded interrogation signal having a parameter such that transponder means is non-responsive thereto, and said simulated coded response signals having parameters such that said decoding means are non-responsive thereto.
Claim 10
Dependent Claim
639 words
A central station alarm system for monitoring alarm conditions ocurring at a plurality of remote locations and employing a computer to expedite transmission of alarm indications and locations to responsible authorities, said system comprising: a plurality of alarm signaling means, at least one at each of said remote locations, each for transmitting an alarm signal to said central station in response to the occurrence of an alarm condition at its remote location; a plurality of alarm monitoring means located at said central station, each alarm monitoring means being arranged to receive said alarm signal from a respective alarm signaling means, each alarm monitoring means including: an indicator responsive to reception of said alarm signal for providing a humanly perceptible alarm indication; logic means for generating a first signal in response to reception of said alarm signal; actuable means responsible to a predetermined signal for turning off said first signal; and an interface unit connected between said computer and said plurality of alarm monitoring means and including: scanner means for sampling said alarm monitoring means in sequence to detect for generation of said first signal at a sampled alarm monitoring means; means responsive to detection of a generated first signal at a sampled alarm monitoring means for terminating sequential sampling by said scanner means and for transmitting to said computer an identification signal indicating which alarm monitoring means is the source of said detected first signal; and means responsive to reception of a further identification signal from said computer fro transmitting said predetermined signal to said actuable means located in the alarm monitoring means identified by said further identification signal; and further comprising at said central station: a selective actuated failure indicator; and circuit means responsive to said first signal and said actuable means for actuating said failure indicator when the time between generation of said first signal and actuation of said actuable means by said predetermined signal exceeds a pre-established time interval; wherein said indicator is a lamp, each alarm monitoring means further comprising: means responsive to reception of said alarm signal for flashing said lamp on and off repeatedly at a predetermined frequency; and means responsive to reception of a specified signal from said interface unit for terminating on and off flashing of said lamp and maintaining said lamp on until termination of said received alarm signal; and wherein said interface unit includes means responsive to reception of said further identification signal from said computer for transmitting said specified signal to the alarm monitoring means identified by said further identification signal; and wherein interconnection between each alarm signaling means and its alarm monitoring means is via a respective pair of conductors over which said alarm signal is transmitted in the form of a predetermined voltage differential, and wherein zero voltage between said pair of conductors constitutes a trouble signal signifying a trouble condition, said system further comprising: at each alarm monitoring means: a trouble lamp; means responsive to reception of said trouble signal at said alarm monitoring means for flashing said trouble lamp on and off repeatedly; means responsive to a second specified signal from said interface unit for terminating on and off flashing of said trouble lamp and maintaining said trouble lamp on until termination of said received trouble signal; and means comprising part of said logic means for generating said first signal and a trouble bus in response to reception of said trouble signal; and wherein said interface unit includes: means responsive to detection of said first signal and said alarm bus at a sampled alarm monitoring means for transmitting said trouble bus along with said identification signal to said computer; and means responsive to reception of said further identification signal and a trouble reply bus from said computer for transmitting said second specified signal to the alarm monitoring means identified by said further identification signal.
Claim 11
Dependent Claim
639 words
A central station alarm system for monitoring alarm conditions ocurring at a plurality of remote locations and employing a computer to expedite transmission of alarm indications and locations to responsible authorities, said system comprising: a plurality of alarm signaling means, at least one at each of said remote locations, each for transmitting an alarm signal to said central station in response to the occurrence of an alarm condition at its remote location; a plurality of alarm monitoring means located at said central station, each alarm monitoring means being arranged to receive said alarm signal from a respective alarm signaling means, each alarm monitoring means including: an indicator responsive to reception of said alarm signal for providing a humanly perceptible alarm indication; logic means for generating a first signal in response to reception of said alarm signal; actuable means responsible to a predetermined signal for turning off said first signal; and an interface unit connected between said computer and said plurality of alarm monitoring means and including: scanner means for sampling said alarm monitoring means in sequence to detect for generation of said first signal at a sampled alarm monitoring means; means responsive to detection of a generated first signal at a sampled alarm monitoring means for terminating sequential sampling by said scanner means and for transmitting to said computer an identification signal indicating which alarm monitoring means is the source of said detected first signal; and means responsive to reception of a further identification signal from said computer fro transmitting said predetermined signal to said actuable means located in the alarm monitoring means identified by said further identification signal; and further comprising at said central station: a selective actuated failure indicator; and circuit means responsive to said first signal and said actuable means for actuating said failure indicator when the time between generation of said first signal and actuation of said actuable means by said predetermined signal exceeds a pre-established time interval; wherein said indicator is a lamp, each alarm monitoring means further comprising: means responsive to reception of said alarm signal for flashing said lamp on and off repeatedly at a predetermined frequency; and means responsive to reception of a specified signal from said interface unit for terminating on and off flashing of said lamp and maintaining said lamp on until termination of said received alarm signal; and wherein said interface unit includes means responsive to reception of said further identification signal from said computer for transmitting said specified signal to the alarm monitoring means identified by said further identification signal; and wherein interconnection between each alarm signaling means and its alarm monitoring means is via a respective pair of conductors over which said alarm signal is transmitted in the form of a predetermined voltage differential, and wherein zero voltage between said pair of conductors constitutes a trouble signal signifying a trouble condition, said system further comprising: at each alarm monitoring means: a trouble lamp; means responsive to reception of said trouble signal at said alarm monitoring means for flashing said trouble lamp on and off repeatedly; means responsive to a second specified signal from said interface unit for terminating on and off flashing of said trouble lamp and maintaining said trouble lamp on until termination of said received trouble signal; and means comprising part of said logic means for generating said first signal and a trouble bus in response to reception of said trouble signal; and wherein said interface unit includes: means responsive to detection of said first signal and said alarm bus at a sampled alarm monitoring means for transmitting said trouble bus along with said identification signal to said computer; and means responsive to reception of said further identification signal and a trouble reply bus from said computer for transmitting said second specified signal to the alarm monitoring means identified by said further identification signal.
Claim 12
Dependent Claim
127 words
The system according to claim 8 further comprising: means located at said central station for selectively transmitting to said remote locations via said pairs of conductors an interrogate signal having a predetermined characteristic; at each remote location, means responsive to said predetermined characteristic of a received interrogate signal for transmitting a coded identification signal to said central station via said pair of conductors; and decoding means and a tamper indicator located at each alarm monitoring means, said decoding means being operative to decode the coded identification signals received from said remote locations, said decoding means including means responsive to a time delay in excess of a pre-established interval between transmission of said interrogate signal and reception of a proper coded identification signal for activating said tamper indicator.
Claim 13
Dependent Claim
46 words
The system according to claim 9 further comprising means located at said central station for transmitting false interrogation signals to said remote locations over said pairs of conductors during intervals when said interrogation signal is not being transmitted, said false interrogation signals lacking said predetermined characteristic.
Claim 14
Dependent Claim
53 words
The system according to claim 9 wherein said interrogation signal is an audio tone and said predetermined characteristic is the frequency of said tone; and wherein said coded identification signal comprises a plurality of audio tones of different frequency, each remote station being identified by the combination of frequencies of its audio tones.
Claim 15
Dependent Claim
52 words
The system according to claim 11 wherein said interrogation signal is an audio tone and said predetermined characteristic is the frequency of said tone; and wherein said coded identification signal comprises a plurality of audio tones of different frequencies, each remote location being uniquely identified by the combination of audio tone frequencies.
Claim 16
Dependent Claim
548 words
A central station alarm system for monitoring alarm conditions occuring at a plurality of remote locations and employing a computer to expedite transmission of alarm indications and locations to responsible authorities, said system comprising: a plurality of alarm signaling means, at least one at each of said remote locations, each for transmitting an alarm signal to said central station in response to the occurrence of an alarm condition at its remote location; a plurality of alarm monitoring means located at said central station, each alarm monitoring means being arranged to receive said alarm signal from a respective alarm signaling means, each alarm monitoring means including: an indicator responsive to reception of said alarm signal for providing a humanly perceptible alarm indication; logic means for generating a first signal in response to reception of said alarm signal; actuable means responsible to a predetermined signal for turning off said first signal; and an interface unit connected between said computer and said plurality of alarm monitoring means and including: scanner means for sampling said alarm monitoring means in sequence to detect for generation of said first signal at a sampled alarm monitoring means; means responsive to detection of a generated first signal at a sampled alarm monitOring means for terminating sequential sampling by said scanner means and for transmitting to said computer an identification signal indicating which alarm monitoring means is the source of said detected first signal; and means responsive to reception of a further identification signal from said computer for transmitting said predetermined signal to said actuable means located in the alarm monitoring means identified by said further identification signal; and further comprising at said central station: a selective actuated failure indicator; and circuit means responsive to said first signal and said actuable means for actuating said failure indicator when the time between generation of said first signal and actuation of said actuable means by said predetermined signal exceeds a pre-established time interval; said system additionally monitoring equipment trouble conditions occurring at said remote locations, said system further comprising: at each remote location, trouble signaling means for transmitting a trouble signal to the alarm monitoring means for that remote location in response to occurrence of a trouble condition; means at each alarm monitoring means for receiving said trouble signal from the associated remote locations, said alarm monitoring means also including: a trouble indicator responsive to reception of said alarm signal for providing a humanly perceptible trouble indication; means comprising part of said logic means for generating a second signal in response to reception of said trouble signal; means comprising part of said actuable means for inhibiting said second signal in response to said predetermined signal; means at said interface unit responsive to detection of a generated second signal at a sampled alarm monitoring means during sampling by said scanner means for terminating sequential sampling by said scanner means and for transmitting said second signal and said identification signal to said computer to indicate which alarm monitoring means is the source of said detected second signal; and means responsive to reception of said further identification signal and a trouble reply signal from said computer for transmitting said predetermined signal and said trouble reply signal to the actuable means located in the alarm monitoring means identified by said further identification signal.
Claim 17
Dependent Claim
548 words
A central station alarm system for monitoring alarm conditions occuring at a plurality of remote locations and employing a computer to expedite transmission of alarm indications and locations to responsible authorities, said system comprising: a plurality of alarm signaling means, at least one at each of said remote locations, each for transmitting an alarm signal to said central station in response to the occurrence of an alarm condition at its remote location; a plurality of alarm monitoring means located at said central station, each alarm monitoring means being arranged to receive said alarm signal from a respective alarm signaling means, each alarm monitoring means including: an indicator responsive to reception of said alarm signal for providing a humanly perceptible alarm indication; logic means for generating a first signal in response to reception of said alarm signal; actuable means responsible to a predetermined signal for turning off said first signal; and an interface unit connected between said computer and said plurality of alarm monitoring means and including: scanner means for sampling said alarm monitoring means in sequence to detect for generation of said first signal at a sampled alarm monitoring means; means responsive to detection of a generated first signal at a sampled alarm monitOring means for terminating sequential sampling by said scanner means and for transmitting to said computer an identification signal indicating which alarm monitoring means is the source of said detected first signal; and means responsive to reception of a further identification signal from said computer for transmitting said predetermined signal to said actuable means located in the alarm monitoring means identified by said further identification signal; and further comprising at said central station: a selective actuated failure indicator; and circuit means responsive to said first signal and said actuable means for actuating said failure indicator when the time between generation of said first signal and actuation of said actuable means by said predetermined signal exceeds a pre-established time interval; said system additionally monitoring equipment trouble conditions occurring at said remote locations, said system further comprising: at each remote location, trouble signaling means for transmitting a trouble signal to the alarm monitoring means for that remote location in response to occurrence of a trouble condition; means at each alarm monitoring means for receiving said trouble signal from the associated remote locations, said alarm monitoring means also including: a trouble indicator responsive to reception of said alarm signal for providing a humanly perceptible trouble indication; means comprising part of said logic means for generating a second signal in response to reception of said trouble signal; means comprising part of said actuable means for inhibiting said second signal in response to said predetermined signal; means at said interface unit responsive to detection of a generated second signal at a sampled alarm monitoring means during sampling by said scanner means for terminating sequential sampling by said scanner means and for transmitting said second signal and said identification signal to said computer to indicate which alarm monitoring means is the source of said detected second signal; and means responsive to reception of said further identification signal and a trouble reply signal from said computer for transmitting said predetermined signal and said trouble reply signal to the actuable means located in the alarm monitoring means identified by said further identification signal.
Claim 18
Dependent Claim
449 words
A central station alarm system for monitoring alarm conditions occuring at a plurality of remote locations and employing a computer to expedite transmission of alarm indications and locations to responsible authorities, said system comprising: a plurality of alarm signaling means, at least one at each of said remote locations, each for transmitting an alarm signal to said central station in response to the occurrence of an alarm condition at its remote location; a plurality of alarm monitoring means located at said central station, each alarm monitoring means being arranged to receive said alarm signal from a respective alarm signaling means, each alarm monitoring means including: an indicator responsive to reception of said alarm signal for providing a humanly perceptible alarm indication; logic means for generating a first signal in response to reception of said alarm signal; actuable means responsible to a predetermined signal for turning off said first signal; and an interface unit connected between said computer and said plurality of alarm monitoring means and including: scanner means for sampling said alarm monitoring means in sequence to detect for generation of said first signal at a sampled alarm monitoring means; means responsive to detection of a generated first signal at a sampled alarm monitoring means for terminating sequential sampling by said scanner means and for transmitting to said computer an identification signal indicating which alarm monitoring means is the source of said detected first signal; and means responsive to reception of a Further identification signal from said computer for transmitting said predetermined signal to said actuable means located in the alarm monitoring means identified by said further identification signal; and further comprising at said central station: a selective actuated failure indicator; and circuit means responsive to said first signal and said actuable means for actuating said failure indicator when the time between generation of said first signal and actuation of said actuable means by said predetermined signal exceeds a pre-established time interval; said system further comprising an alarm tamper proof arrangement comprising: means located at said central station for selectively transmitting to said remote locations an interrogate signal having a predetermined characteristic; at said remote locations, means responsive to said predetermined characteristic of a received interrogate signal for transmitting a coded identification signal to a respective alarm monitoring means, said coded interrogate signal uniquely identifying the remote location from which it is transmitted; and decoding means and a tamper indicator located at each alarm monitoring means, said decoding means including means for decoding received coded identification signals and means responsive to a time delay in excess of a pre-established interval between transmission of said interrogate signal and reception of a proper coded identification signal for actuating said tamper indicator.
Claim 19
Dependent Claim
449 words
A central station alarm system for monitoring alarm conditions occuring at a plurality of remote locations and employing a computer to expedite transmission of alarm indications and locations to responsible authorities, said system comprising: a plurality of alarm signaling means, at least one at each of said remote locations, each for transmitting an alarm signal to said central station in response to the occurrence of an alarm condition at its remote location; a plurality of alarm monitoring means located at said central station, each alarm monitoring means being arranged to receive said alarm signal from a respective alarm signaling means, each alarm monitoring means including: an indicator responsive to reception of said alarm signal for providing a humanly perceptible alarm indication; logic means for generating a first signal in response to reception of said alarm signal; actuable means responsible to a predetermined signal for turning off said first signal; and an interface unit connected between said computer and said plurality of alarm monitoring means and including: scanner means for sampling said alarm monitoring means in sequence to detect for generation of said first signal at a sampled alarm monitoring means; means responsive to detection of a generated first signal at a sampled alarm monitoring means for terminating sequential sampling by said scanner means and for transmitting to said computer an identification signal indicating which alarm monitoring means is the source of said detected first signal; and means responsive to reception of a Further identification signal from said computer for transmitting said predetermined signal to said actuable means located in the alarm monitoring means identified by said further identification signal; and further comprising at said central station: a selective actuated failure indicator; and circuit means responsive to said first signal and said actuable means for actuating said failure indicator when the time between generation of said first signal and actuation of said actuable means by said predetermined signal exceeds a pre-established time interval; said system further comprising an alarm tamper proof arrangement comprising: means located at said central station for selectively transmitting to said remote locations an interrogate signal having a predetermined characteristic; at said remote locations, means responsive to said predetermined characteristic of a received interrogate signal for transmitting a coded identification signal to a respective alarm monitoring means, said coded interrogate signal uniquely identifying the remote location from which it is transmitted; and decoding means and a tamper indicator located at each alarm monitoring means, said decoding means including means for decoding received coded identification signals and means responsive to a time delay in excess of a pre-established interval between transmission of said interrogate signal and reception of a proper coded identification signal for actuating said tamper indicator.
Claim 20
Dependent Claim
31 words
The system according to claim 14 further comprising means for transmitting false identification signals from said central station to said remote location during intervals when said interrogation signal is not transmitted.
Claim 21
Dependent Claim
52 words
The system according to claim 14 wherein said interrogation signal is an audio tone and said predetermined characteristic is the frequency of said tone; and wherein said coded identification signal comprises a plurality of audio tones of dirrect frequencies, each remote location being uniquely identified by the combination of audio tone frequencies.
Claim 22
Dependent Claim
163 words
In a central station alarm system of the type wherein a plurality of remote alarm signaling locations transmit alarm signals to respective alarm monitors of said central station, said alarm signals being indicative of the occurrence of alarm conditions at said locations, a tamper protection sub-system comprising: selectively actuable interrogator means located at said central station for transmitting to said remote locations an interrogate signal having a predetermined characteristic; at said remote locations, means responsive to said predetermined characteristic of a received interrogate signal for transmitting a coded identification signal to a respective alarm monitor, said coded interrogate signal uniquely identifying the remote location from which it is transmitted; and decoding means and a tamper indicator for each alarm monitor, said decoding means including means for decoding received coded identification signals and means responsive to a time delay in excess of a pre-established interval between transmission of said interrogate signal and reception of a proper coded identification signal for actuating said tamper indicator.
Claim 23
Dependent Claim
163 words
In a central station alarm system of the type wherein a plurality of remote alarm signaling locations transmit alarm signals to respective alarm monitors of said central station, said alarm signals being indicative of the occurrence of alarm conditions at said locations, a tamper protection sub-system comprising: selectively actuable interrogator means located at said central station for transmitting to said remote locations an interrogate signal having a predetermined characteristic; at said remote locations, means responsive to said predetermined characteristic of a received interrogate signal for transmitting a coded identification signal to a respective alarm monitor, said coded interrogate signal uniquely identifying the remote location from which it is transmitted; and decoding means and a tamper indicator for each alarm monitor, said decoding means including means for decoding received coded identification signals and means responsive to a time delay in excess of a pre-established interval between transmission of said interrogate signal and reception of a proper coded identification signal for actuating said tamper indicator.
Claim 24
Dependent Claim
31 words
The system according to claim 17 further comprising means for transmitting false identification signals from said central station to said remote locations during intervals when said interrogation signal is not transmitted.
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USPTO Annuity & Maintenance Windows
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| 3.5 Years (Year 4) | 1975-10-10 | 1976-04-10 | 1976-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-10 | 1980-04-10 | 1980-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-10 | 1984-04-10 | 1984-10-10 | $7700.00 | Window Closed / Lapsed |