EP0032135A3 - Monitoring apparatus - Google Patents

Monitoring apparatus Download PDF

Info

Publication number
EP0032135A3
EP0032135A3 EP81300065A EP81300065A EP0032135A3 EP 0032135 A3 EP0032135 A3 EP 0032135A3 EP 81300065 A EP81300065 A EP 81300065A EP 81300065 A EP81300065 A EP 81300065A EP 0032135 A3 EP0032135 A3 EP 0032135A3
Authority
EP
European Patent Office
Prior art keywords
remote unit
master
burst
reply
remote
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP81300065A
Other languages
German (de)
French (fr)
Other versions
EP0032135A2 (en
Inventor
Robin Ernest Peck
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Raveningham Electronic Research Ltd
Original Assignee
Raveningham Electronic Research Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Raveningham Electronic Research Ltd filed Critical Raveningham Electronic Research Ltd
Publication of EP0032135A2 publication Critical patent/EP0032135A2/en
Publication of EP0032135A3 publication Critical patent/EP0032135A3/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR 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
    • G08B29/06—Monitoring of the line circuits, e.g. signalling of line faults
    • G08B29/08—Signalling of tampering with the line circuit
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
    • G08B25/01—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium
    • G08B25/06—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium using power transmission lines
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR 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
    • G08B29/04—Monitoring of the detection circuits

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Selective Calling Equipment (AREA)
  • Alarm Systems (AREA)

Abstract

Where monitoring apparatus includes remote units intended to maintain surveillance of an area for an event such as unauthorised entry into the area, a remote unit fails to convey to a master unit any information if the remote unit ceases to function. A master transmitter (11) therefore trans­ mits, over mains electricity supply lines, frequency-­ modulated bursts which stimulate the or each remote unit to reply with a characteristic frequency-modulated burst for each burst from the master transmitter (11). The master frequency-modulated burst resets a counter (38) in the remote unit. If a remote unit fails, or detects an alarm situation, the remote unit does not reply, the counter (38) being frozen. A master receiver and indicator (12) demodulates the charac­ teristic bursts from the remote unit or units and prevents an alarm (65) from sounding provided that the characteristic bursts are received at the expected intervals. Failure of a characteristic burst to arrive results in the alarm (65) being sounded and a red LED (64, 76, 77 or 78) being energised to indicate which of four remote units has failed to reply.
EP81300065A 1980-01-08 1981-01-08 Monitoring apparatus Withdrawn EP0032135A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8000544A GB2067321B (en) 1980-01-08 1980-01-08 Monitoring apparatus
GB8000544 1980-01-08

Publications (2)

Publication Number Publication Date
EP0032135A2 EP0032135A2 (en) 1981-07-15
EP0032135A3 true EP0032135A3 (en) 1982-02-10

Family

ID=10510505

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81300065A Withdrawn EP0032135A3 (en) 1980-01-08 1981-01-08 Monitoring apparatus

Country Status (3)

Country Link
EP (1) EP0032135A3 (en)
GB (1) GB2067321B (en)
ZA (1) ZA81120B (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2119981B (en) * 1982-01-07 1985-08-07 Morrison John M Alarm systems
IT1159756B (en) * 1982-03-18 1987-03-04 Zanussi Zeltron Inst CONVEYED WAVE CONTROL AND SAFETY SYSTEM
FR2578372B1 (en) * 1985-03-01 1987-05-15 Fichet Bauche METHOD FOR TRANSMITTING SIGNALS, IN PARTICULAR FOR MONITORING A SET OF ZONES TO BE PROTECTED, BETWEEN A CENTRAL STATION AND A PLURALITY OF DETECTION CIRCUITS CONNECTED THEREWITH BY A TRANSMISSION MEDIUM AND SYSTEM FOR IMPLEMENTING SAME SUCH A PROCESS
GB8512655D0 (en) * 1985-05-20 1985-06-26 London Technology Network Security systems
GB8526294D0 (en) * 1985-10-24 1985-11-27 Pcg Designs Ltd Alarm & signalling systems

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3813655A (en) * 1971-05-24 1974-05-28 Microwave & Electronic Syst Monitoring systems and apparatus therefor
US3925763A (en) * 1973-09-13 1975-12-09 Romesh Tekchand Wadhwani Security system
DE2749169A1 (en) * 1977-11-03 1979-05-10 Elektronik Geraete Gmbh Automatic burglar alarm system - has central control and detector stages coupled over lighting mains circuit

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3813655A (en) * 1971-05-24 1974-05-28 Microwave & Electronic Syst Monitoring systems and apparatus therefor
US3925763A (en) * 1973-09-13 1975-12-09 Romesh Tekchand Wadhwani Security system
DE2749169A1 (en) * 1977-11-03 1979-05-10 Elektronik Geraete Gmbh Automatic burglar alarm system - has central control and detector stages coupled over lighting mains circuit

Also Published As

Publication number Publication date
GB2067321A (en) 1981-07-22
EP0032135A2 (en) 1981-07-15
ZA81120B (en) 1982-01-27
GB2067321B (en) 1983-07-06

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT CH DE FR IT NL SE

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Designated state(s): AT CH DE FR IT NL SE

17P Request for examination filed

Effective date: 19820526

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19840327

RIN1 Information on inventor provided before grant (corrected)

Inventor name: PECK, ROBIN ERNEST