FR2279173A2 - Anti-theft security system - has central transmitter receiver to interrogates peripheral transmitter receivers - Google Patents

Anti-theft security system - has central transmitter receiver to interrogates peripheral transmitter receivers

Info

Publication number
FR2279173A2
FR2279173A2 FR7424611A FR7424611A FR2279173A2 FR 2279173 A2 FR2279173 A2 FR 2279173A2 FR 7424611 A FR7424611 A FR 7424611A FR 7424611 A FR7424611 A FR 7424611A FR 2279173 A2 FR2279173 A2 FR 2279173A2
Authority
FR
France
Prior art keywords
transmitter
receivers
peripheral
receiver
security system
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.)
Pending
Application number
FR7424611A
Other languages
French (fr)
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to FR7424611A priority Critical patent/FR2279173A2/en
Publication of FR2279173A2 publication Critical patent/FR2279173A2/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B26/00—Alarm systems in which substations are interrogated in succession by a central station
    • G08B26/004—Alarm systems in which substations are interrogated in succession by a central station with common interrogation of substations
    • 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
    • G08B25/10—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 wireless transmission systems

Landscapes

  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Burglar Alarm Systems (AREA)

Abstract

The device forms part of a wireless security system, which is inviolable and which has permanent control of its operating state. The principal transmitter-receiver emits and transmits, by regular carrier waves, interrogation signals destined to interrogate peripheral transmitter-receivers which are the only ones able to receive these signals. The peripheral transmitter-receivers in their turn transmit to the principal transmitter-receivers by means of a carrier wave, response signals which only the principal transmitter receiver can receive. An alarm is triggered when the principal transmitter receiver does not receive the response signal from the peripheral-transmitter within a certain time.
FR7424611A 1974-07-16 1974-07-16 Anti-theft security system - has central transmitter receiver to interrogates peripheral transmitter receivers Pending FR2279173A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7424611A FR2279173A2 (en) 1974-07-16 1974-07-16 Anti-theft security system - has central transmitter receiver to interrogates peripheral transmitter receivers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7424611A FR2279173A2 (en) 1974-07-16 1974-07-16 Anti-theft security system - has central transmitter receiver to interrogates peripheral transmitter receivers

Publications (1)

Publication Number Publication Date
FR2279173A2 true FR2279173A2 (en) 1976-02-13

Family

ID=9141306

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7424611A Pending FR2279173A2 (en) 1974-07-16 1974-07-16 Anti-theft security system - has central transmitter receiver to interrogates peripheral transmitter receivers

Country Status (1)

Country Link
FR (1) FR2279173A2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0125387A1 (en) * 1983-04-29 1984-11-21 Cerberus Ag Risk signalling method and apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0125387A1 (en) * 1983-04-29 1984-11-21 Cerberus Ag Risk signalling method and apparatus

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