GB2297410B - An electrical circuit comprising a plurality of bi-state devices arranged for determining a device by type which has changed state - Google Patents

An electrical circuit comprising a plurality of bi-state devices arranged for determining a device by type which has changed state

Info

Publication number
GB2297410B
GB2297410B GB9601625A GB9601625A GB2297410B GB 2297410 B GB2297410 B GB 2297410B GB 9601625 A GB9601625 A GB 9601625A GB 9601625 A GB9601625 A GB 9601625A GB 2297410 B GB2297410 B GB 2297410B
Authority
GB
United Kingdom
Prior art keywords
state
determining
type
electrical circuit
devices arranged
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.)
Expired - Fee Related
Application number
GB9601625A
Other versions
GB2297410A (en
GB9601625D0 (en
Inventor
Francis Joseph Anderson
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.)
CETSA Ltd
Original Assignee
CETSA 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 CETSA Ltd filed Critical CETSA Ltd
Publication of GB9601625D0 publication Critical patent/GB9601625D0/en
Publication of GB2297410A publication Critical patent/GB2297410A/en
Application granted granted Critical
Publication of GB2297410B publication Critical patent/GB2297410B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • 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
    • G08B25/018—Sensor coding by detecting magnitude of an electrical parameter, e.g. resistance

Landscapes

  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Burglar Alarm Systems (AREA)
  • Alarm Systems (AREA)
GB9601625A 1995-01-27 1996-01-26 An electrical circuit comprising a plurality of bi-state devices arranged for determining a device by type which has changed state Expired - Fee Related GB2297410B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IE950060 1995-01-27

Publications (3)

Publication Number Publication Date
GB9601625D0 GB9601625D0 (en) 1996-03-27
GB2297410A GB2297410A (en) 1996-07-31
GB2297410B true GB2297410B (en) 1998-09-30

Family

ID=11040637

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9601625A Expired - Fee Related GB2297410B (en) 1995-01-27 1996-01-26 An electrical circuit comprising a plurality of bi-state devices arranged for determining a device by type which has changed state

Country Status (2)

Country Link
GB (1) GB2297410B (en)
IE (2) IES960082A2 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IES71514B2 (en) * 1995-08-11 1997-02-12 Cetsa Ltd An interface circuit for an infrared detector
GB2339943B (en) * 1998-07-21 2003-04-16 Metrixx Ltd Signalling system
US6133709A (en) * 1997-01-21 2000-10-17 Metrixx Limited Signalling system
FR2790130B1 (en) * 1999-02-19 2001-10-05 Automatismes Sicli DETECTION DEVICE AND ITS IMPLEMENTING METHOD
EP1329861B1 (en) 2002-01-16 2006-04-19 Leeds Electronic Eng. Ltd. Burglar alarm system having reduced wiring
US8081074B2 (en) 2007-09-11 2011-12-20 Marshall Jack L Security system for protecting construction site assets

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1429781A (en) * 1972-03-01 1976-03-24 Child J V Multi-point alarm systems
EP0015656A2 (en) * 1979-02-09 1980-09-17 Philip Charles Sefton Improvements relating to security equipment
GB2082358A (en) * 1980-08-14 1982-03-03 Dynalarm Ltd Security systems
GB2101781A (en) * 1981-07-17 1983-01-19 United Gas Ind Plc Commodity Meters
GB2111273A (en) * 1981-11-03 1983-06-29 Gateway Security Systems Limit Multiple detector circuit
GB2145863A (en) * 1983-08-08 1985-04-03 Pittway Corp Monitoring system

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1429781A (en) * 1972-03-01 1976-03-24 Child J V Multi-point alarm systems
EP0015656A2 (en) * 1979-02-09 1980-09-17 Philip Charles Sefton Improvements relating to security equipment
GB2082358A (en) * 1980-08-14 1982-03-03 Dynalarm Ltd Security systems
GB2101781A (en) * 1981-07-17 1983-01-19 United Gas Ind Plc Commodity Meters
GB2111273A (en) * 1981-11-03 1983-06-29 Gateway Security Systems Limit Multiple detector circuit
GB2145863A (en) * 1983-08-08 1985-04-03 Pittway Corp Monitoring system

Also Published As

Publication number Publication date
GB2297410A (en) 1996-07-31
IES68335B2 (en) 1996-06-12
IES960082A2 (en) 1996-06-12
GB9601625D0 (en) 1996-03-27
IE960081A1 (en) 1996-08-07

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20090126