US3765016A - Security system including means for polling the premises to be protected - Google Patents

Security system including means for polling the premises to be protected Download PDF

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Publication number
US3765016A
US3765016A US00146111A US3765016DA US3765016A US 3765016 A US3765016 A US 3765016A US 00146111 A US00146111 A US 00146111A US 3765016D A US3765016D A US 3765016DA US 3765016 A US3765016 A US 3765016A
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United States
Prior art keywords
subscriber
station
central station
loop
transmission
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Expired - Lifetime
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US00146111A
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English (en)
Inventor
P Bert
L Jedynak
S Gulf
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OCI Communcations Inc
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Oak Electro Netics Corp
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Assigned to M/A-COM, INC., A CORP. OF MASSACHUSETTS reassignment M/A-COM, INC., A CORP. OF MASSACHUSETTS LICENSE (SEE DOCUMENT FOR DETAILS). Assignors: OAK INDUSTRIES, INC.
Assigned to ZENITH ELECTRONICS CORPORATION, A CORP. OF DE reassignment ZENITH ELECTRONICS CORPORATION, A CORP. OF DE LICENSE (SEE DOCUMENT FOR DETAILS). Assignors: OAK INDUSTRIES, INC.
Assigned to ZENITH ELECTRONICS CORPORATION, A CORP OF DELAWARE reassignment ZENITH ELECTRONICS CORPORATION, A CORP OF DELAWARE LICENSE (SEE DOCUMENT FOR DETAILS). Assignors: OAK INDUSTRIES, INC.,
Assigned to OCI COMMUNICATIONS, INC. reassignment OCI COMMUNICATIONS, INC. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: OAK INDUSTRIES INC.
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    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B26/00—Alarm systems in which substations are interrogated in succession by a central station
    • G08B26/005—Alarm systems in which substations are interrogated in succession by a central station with substations connected in series, e.g. cascade
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
    • G08B29/02—Monitoring continuously signalling or alarm systems

Definitions

  • the present invention relates to a security system, in particular to a security system in which a plurality of subscriber stations are connected in a transmission loop to a central station which is arranged to sequentially and periodically poll the subscribers to monitor on site alarm systems.
  • Another purpose is a security system of the type described including means for locating a fault in the transmission loop.
  • Another purpose is a security system of the type described which is operable with a fault in the transmission loop.
  • Another purpose is a reliably operable, simply constructed security system of the type described.
  • Another purpose is a security system of the type described in which the transmitting and receiving apparatus at the central station can be switched from one side of the transmission loop to the other for use in locating a fault on the loop.
  • each subscriber location includes means for receiving an interrogating signal, means for comparing said signal against the locations address, and means for responding to the interrogating signal, if the correct address was provided.
  • Another purpose is a security system in which each subscriber location is polled sequentially and at predetermined intervals.
  • Another purpose is a security system of the type described in which each subscriber station will automatically open the transmission loop at the subscribers station, if that particular station has not been polled within a given time.
  • FIG. 1 is a diagrammatic illustration of a security system of the type described
  • FIG. 2 is a diagrammatic illustration of a subscriber station
  • FIG. 3 is a diagram of typical interrogation and response signals used in the security system described herein.
  • FIG. 1 acentral station is indicated at and a plurality of subscriber stations are indicated at 12, 14, .16, and 18.
  • the subscriber locations 12-16 are connected in series in a transmission loop, the transmitting side of the loop being indicated at 20 and the receiving side of the loop being indicated at 22.
  • the central station contains both transmission and receiving equipment, as well as switching equipment to reverse the direction of transmission and reception.
  • the receiving equipment will include means for processing the signals from the various subscriber locations to monitor on site alarm systems.
  • the central station will periodically and preferably sequentially poll each of the subscriber stations, and there may be any number of subscriber stations on a single loop.
  • the received signals will give an indication at the central station of the condition of the alarm system at each station.
  • the invention should'not be limited to any particular number of subscriber stations and there may be as many as several hundred on a single loop.
  • each subscriber station there may be any number of independent alarm systems. For example, there may be a fire detection sensor, a security sensor such as a burglar alarm, a sensor to detect water temperature or to monitor any other function located at the premises in question.
  • the subscriber stations may be residences, they may be business establishments, or they may be small manufacturing facilities in which it is desired to monitor certain control functions during the off hours. Normally the various subscribers on the same loop will be those in which basically the same functions are monitored, although this is not necessary.
  • FIG. 2 illustrates the details of the transmission and receiving equipment at a subscribers location.
  • the contacts and arm of a line relay are indicated at 24 and in the embodiment shown the relay is normally in a closed position.
  • lines 26 and 28 connected to band pass filters 30 and 32 used to control the noise level of the received signal. In some applications the filters may not be necessary, as normally the noise codition of the loop is rather rigidly controlled by telephone company equip ment.
  • Each of the filters 30 and 32 are connected to amplifiers 34 and 36 which are preferably field effect transistor amplifiers to provide as little loading as possible on the line.
  • the amplifiers 34 and 36 are connected to a combiner amplifier 38 which in the normal situation will receive two identical signals, with its output consisting of positive and negative polarity pulses approximately 1 millisecond in duration.
  • the combiner amplifier 38 is connected to a level sensor 40 which places a threshhold value on the amplitudes of the positive and negative pulses at its input. Such a level sensor is desirable because of the various levels of attenuation and noise present in the system.
  • the output of the level sensor is connected to a limiter 42 which clamps the levels of the positive and the negative pulses at desired values.
  • the limiter 42 is connected to an integrator 44and to an address read circuit 46.
  • the first pulse or reset pulse of the interrogating signal from the central station has twice the duration of a normal information pulse. This pulse duration is sufficiently long such that there will be an output pulse from the integrator.
  • the integrator output pulse is fed to a processor reset 48 which initiates the address read cycle.
  • the reset circuit 48 also, starts the clock 50, which in turn controls the various circuits hereinafter described.
  • the pulse train or word sequence from the limiter 42 is directed to the address read circuit 46 and afterth'e reset pulse has started operation of the clock and the address read circuit, the following nine pulses to the address read circuit are compared with the address for the particular subscriber station. As illustrated in FIG. 3,
  • both the address read and the address decoder so as to coordinate their operation. If there is no correlation between the address in a particular signal and the address of a subscriber's station, no further function will take place at that particular subscriber station.
  • the relay control 60 controls the coil 62 for line relay 24.
  • the line relay 24 will be maintained in the closed position, providing that the particular subscriber location is properly addressed at least once during a given time interval and the relay is commanded to be closed. In the event that there is no proper address to that location during the time interval in question, which may be anywhere from to 30 seconds, the line relay will then open.
  • the clock 50 will trigger the alarm processor 64 into sending a signal indicative of the condition of the various alarm sensors 66, to the alarm memory 58.
  • the alarm memory 58 is triggered by the output from the address decoder 56 and a pulse from clock 50.
  • the output from alarm memory 58 goes to a code converter 70 which converts the information from a binary code signal into positive and negative pulses for transmission back to the central station.
  • the signal from the code converter 70 is fed to a line driver 72 which in turn is connected to the transmission loop at the left-hand side of the line relay 24.
  • FIG. 3 illustrates one example of a message and reply between the central station and any one subscriber location.
  • the initial reset pulse which can be considered a 2-bit pulse, is indicated at 52.
  • a further l-bit space indicated at 76 is followed by a l-bit relay command 79 and a l-bit space 81.
  • Space 81 is followed by a 5-bit reply 78.
  • the 21-bit message is completed by a l-bit space 80 at the end of the 5-bit reply.
  • the total message and reply is 21 bits, in the illustrative example, and it is possible in the loop described tohave as many as 512 subscribers.
  • the subscribers are periodically polled or addressed on a sequential basis with the result that each of the subscribers is polled or addressed at least once in any given time period. Not only does this permit the condition of the alarm sensors at each location to be closely monitored, but it also provides a means for locating any fault on the transmission loop.
  • address signals are continually beingsent by the central station to the various subscribers. All of the line relays are closed and the loop integrity is maintained. If there should be a fault on the line, for example a ground between subscribers l4 and 16 in FIG. 1, the address and reply to subscriber 12 may remain normal. However, there would not be sufficient signal strength at subscriber 14 because of the ground fault at its right-hand side, to operate the receiving equipment at that location. Thus, since subscriber 14 would not be addressed or polled during the time interval specified, its line relay would open. Since there is a ground to the right of subscriber 14, neither subscriber 16 nor 18 could be interrogated and their line relays would also open.
  • the switching equipment at the central station would reverse the direction of transmission so that line 22 would be both the transmitting side and the receiving side.
  • subscriber 18 would be polled and the address and relay command bit to that station would cause its line relay to close. The same would take place at any locations between subscribers 18 and 16.
  • Subscriber 16 would be polled, because the signal strength would be at a sufficient level to operate the receiving equipment because subscriber l6s line relay would be open.
  • subscriber l6s relay is commanded to be closed, the ground fault would again be placed on the line.
  • the central station would interpret this abrupt reappearance of the ground fault as evidence that the fault is adjacent to subscriber 16.
  • the next addressing of subscriber 16 would include a command to its relay to stay open, thus isolating the ground fault from the line.
  • a similar procedure would be used on the other side of the fault to isolate the fault on both sides.
  • the line relay will drop out if a location is not polled within a given time. However, when that particular subscriber is subsequently polled, the line relay will be commanded to close or remain open by the relay update and control circuit 60.
  • the line driver circuit 72 which directs the reply back to the central station, is connected to the left-hand side of the line relay. In some applications it may be desirable to connect this circuit to both sides of the line relay. In other applications it may be desirable to have an arrangement whereby as soon as the proper address is provided at the subscribers location, the relay update and control circuit closes a contact so that driver circuit 72 is connected to one or the other side of the line relay.
  • a security system including a central station, a transmission loop connected to said central station, a plurality of subscriber stations connected in series in said loop,
  • transmission means at the central station for periodically sending interrogating signals to each subscriber station
  • sensing means at each subscriber station means for providing a signal indicative of the condition of said sensing means, means at each subscriber stasaid transmission means includes means for transmitting said interrogating signals sequentially and at predetermined intervals.
  • circuit of claim 1 further characterized by and including means at the central station for reversing the direction of transmission on said loop.
  • circuit of claim 1 further characterized by and including address means at each subscriber station for comparing each interrogating signal with the address for that subscriber station.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Alarm Systems (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
US00146111A 1971-05-24 1971-05-24 Security system including means for polling the premises to be protected Expired - Lifetime US3765016A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US14611171A 1971-05-24 1971-05-24

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US3765016A true US3765016A (en) 1973-10-09

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US00146111A Expired - Lifetime US3765016A (en) 1971-05-24 1971-05-24 Security system including means for polling the premises to be protected

Country Status (7)

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US (1) US3765016A (ref)
CA (1) CA1003066A (ref)
DE (1) DE2225244A1 (ref)
FR (1) FR2138931A1 (ref)
GB (1) GB1383777A (ref)
IT (1) IT958001B (ref)
ZA (1) ZA723558B (ref)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3939460A (en) * 1974-04-24 1976-02-17 Barry N. Horn Security alarm system
DE2536946A1 (de) * 1975-08-19 1977-03-03 Damon Corp Ueberwachungssystem zur ueberwachung von ferneinheiten
US4198624A (en) * 1977-05-02 1980-04-15 Hochiki Corporation Alarm system
GB2156126A (en) * 1984-03-05 1985-10-02 Hochiki Co Fire detector
US4562428A (en) * 1982-05-14 1985-12-31 Senstar Security Systems Corp. Intrusion detector
EP0212106A1 (de) * 1985-07-10 1987-03-04 Cerberus Ag Verfahren zur Uebertragung von Messwerten
US4796025A (en) * 1985-06-04 1989-01-03 Simplex Time Recorder Co. Monitor/control communication net with intelligent peripherals
FR2633761A1 (fr) * 1988-06-30 1990-01-05 Hugon Emile Detecteur de fumees avec circuit integre pour adresse
FR2636157A1 (fr) * 1988-09-08 1990-03-09 Hugon Emile Centrale d'adresse et de programmation de detecteur d'alarme incendie
US5572204A (en) * 1995-04-10 1996-11-05 Ford Motor Company Vehicular emergency message system
US5686910A (en) * 1995-04-10 1997-11-11 Ford Motor Company Vehicular emergency message system with automatic periodic call-in
US5687215A (en) * 1995-04-10 1997-11-11 Ford Motor Company Vehicular emergency message system
US5890061A (en) * 1996-02-09 1999-03-30 Ford Motor Company Vehicular emergency message system with call restriction defeating

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4538138A (en) * 1982-12-17 1985-08-27 American District Telegraph Company Integrated security system having a multiprogrammed controller
US4528610A (en) * 1983-07-05 1985-07-09 Apollo Fire Detectors Limited Short circuit fault isolation means for electrical circuit arrangements
GB8431883D0 (en) * 1984-12-18 1985-01-30 Gent Ltd Transmission system
GB2173618B (en) * 1985-04-12 1988-09-14 Emi Ltd Alarm monitoring installation
JPH0632517B2 (ja) * 1985-07-19 1994-04-27 ホーチキ株式会社 異常監視装置
GB2259797B (en) * 1991-09-19 1995-08-16 Rockwell International Corp Fault tolerant multi-drop communications system
EP0626743B1 (en) * 1993-05-25 1999-09-08 Hochiki Corporation Line fault monitoring apparatus
US5801913A (en) * 1996-04-29 1998-09-01 Kiddie-Fenwal, Inc. Isolation circuitry

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3214734A (en) * 1959-06-19 1965-10-26 American District Telegraph Co Protection signalling system having channel impedance alteration means for providing indications of remote station conditions
US3349374A (en) * 1963-08-05 1967-10-24 Motorola Inc Supervisory control system with message traffic control
US3350580A (en) * 1965-11-30 1967-10-31 Sperry Rand Corp Monitor employing logic gate and counter to indicate normal pulse-train failure after predetermined time interval
US3624649A (en) * 1969-10-10 1971-11-30 Honeywell Inc Period readout error checking apparatus
US3626403A (en) * 1968-04-29 1971-12-07 Goodwin Alfred George Ive Protective systems and apparatus therefor
US3676878A (en) * 1968-10-14 1972-07-11 Riley Co The Variable monitoring system

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3214734A (en) * 1959-06-19 1965-10-26 American District Telegraph Co Protection signalling system having channel impedance alteration means for providing indications of remote station conditions
US3349374A (en) * 1963-08-05 1967-10-24 Motorola Inc Supervisory control system with message traffic control
US3350580A (en) * 1965-11-30 1967-10-31 Sperry Rand Corp Monitor employing logic gate and counter to indicate normal pulse-train failure after predetermined time interval
US3626403A (en) * 1968-04-29 1971-12-07 Goodwin Alfred George Ive Protective systems and apparatus therefor
US3676878A (en) * 1968-10-14 1972-07-11 Riley Co The Variable monitoring system
US3624649A (en) * 1969-10-10 1971-11-30 Honeywell Inc Period readout error checking apparatus

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3939460A (en) * 1974-04-24 1976-02-17 Barry N. Horn Security alarm system
DE2536946A1 (de) * 1975-08-19 1977-03-03 Damon Corp Ueberwachungssystem zur ueberwachung von ferneinheiten
US4198624A (en) * 1977-05-02 1980-04-15 Hochiki Corporation Alarm system
US4562428A (en) * 1982-05-14 1985-12-31 Senstar Security Systems Corp. Intrusion detector
GB2156126A (en) * 1984-03-05 1985-10-02 Hochiki Co Fire detector
US4796025A (en) * 1985-06-04 1989-01-03 Simplex Time Recorder Co. Monitor/control communication net with intelligent peripherals
EP0212106A1 (de) * 1985-07-10 1987-03-04 Cerberus Ag Verfahren zur Uebertragung von Messwerten
FR2633761A1 (fr) * 1988-06-30 1990-01-05 Hugon Emile Detecteur de fumees avec circuit integre pour adresse
EP0349403A3 (fr) * 1988-06-30 1991-04-24 Emile Hugon Détecteur de fumées avec circuit intégré pour adresse
FR2636157A1 (fr) * 1988-09-08 1990-03-09 Hugon Emile Centrale d'adresse et de programmation de detecteur d'alarme incendie
EP0365372A1 (fr) * 1988-09-08 1990-04-25 Emile Hugon Centrale d'adresse et de programmation de détecteur d'alarme d'incendie
US5572204A (en) * 1995-04-10 1996-11-05 Ford Motor Company Vehicular emergency message system
US5686910A (en) * 1995-04-10 1997-11-11 Ford Motor Company Vehicular emergency message system with automatic periodic call-in
US5687215A (en) * 1995-04-10 1997-11-11 Ford Motor Company Vehicular emergency message system
US5890061A (en) * 1996-02-09 1999-03-30 Ford Motor Company Vehicular emergency message system with call restriction defeating

Also Published As

Publication number Publication date
GB1383777A (en) 1974-02-12
CA1003066A (en) 1977-01-04
IT958001B (it) 1973-10-20
FR2138931A1 (ref) 1973-01-05
ZA723558B (en) 1973-03-28
DE2225244A1 (de) 1972-12-14

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