WO2002084620A1 - Systeme de communication alarme radiofrequence - Google Patents

Systeme de communication alarme radiofrequence Download PDF

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Publication number
WO2002084620A1
WO2002084620A1 PCT/GB2002/001717 GB0201717W WO02084620A1 WO 2002084620 A1 WO2002084620 A1 WO 2002084620A1 GB 0201717 W GB0201717 W GB 0201717W WO 02084620 A1 WO02084620 A1 WO 02084620A1
Authority
WO
WIPO (PCT)
Prior art keywords
control unit
signal
alarm
control
radio
Prior art date
Application number
PCT/GB2002/001717
Other languages
English (en)
Inventor
Paul Scorer
Michael Garbutt
Original Assignee
Harrison Brothers (Steeplejacks) Limited
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 Harrison Brothers (Steeplejacks) Limited filed Critical Harrison Brothers (Steeplejacks) Limited
Publication of WO2002084620A1 publication Critical patent/WO2002084620A1/fr

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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
    • G08B25/007—Details of data content structure of message packets; data protocols

Definitions

  • the present invention relates to radio frequency alarm communication systems, and relates particularly, but not exclusively, to radio frequency wireless fire alarm systems.
  • a wireless radio frequency detection system is described in GB2288263.
  • a plurality of monitoring units in the form of control panels are in radio communication with associated detectors and alarm sounders. Transmission of signals between the control panels and detectors occurs according to predetermined time slots controlled by the control units, and synchronisation of the operation of the system is controlled by regular transmission by the control panels of a common time reference signal.
  • a radio frequency alarm communication system comprising:
  • control unit a plurality of control units, wherein a plurality of first said control units are adapted to communicate by radio with a second said control unit;
  • a respective radio transmitter for transmitting the or each said alarm signal from the or each said signal input device by radio to the associated control unit
  • control units are adapted to operate independently of each other and the timing of transmission of said transmitters associated with a said control unit is arranged such that simultaneous transmission of signals by more than one transmitter to a single control unit is prevented, and said second control unit is adapted to receive an alarm signal from a said first control unit and transmit said alarm signal directly to the or each other said first control unit.
  • control units which are adapted to operate independently of each other, this provides the advantage that even if one of the control units becomes inoperable, for example by being damaged by fire in the case that the system is a fire alarm system, the remainder of the system remains operable because the other control units continue to operate.
  • the second control unit is adapted to receive an alarm signal from a first control unit and transmit the alarm signal directly to the or each other first control unit, this provides the advantage that the alarm signal can be communicated more rapidly to the other control units than in the case of the prior art, in which the alarm signal is sequentially transmitted between control units. This also provides the advantage of minimising cumulative timing errors which would arise in the case of an alarm signal being sequentially transmitted between control units.
  • At least one said control unit may be adapted to transmit data to at least one other said control unit.
  • Said data may include a timing signal to synchronise operation of a plurality of said control units.
  • Said data may include an indication of the status of said control unit.
  • This provides the advantage of enabling an alarm condition or failure of the control unit to be communicated to other control units in the system.
  • a plurality of said transmitters may be adapted to transmit data relating to the associated signal input device to the corresponding control unit.
  • Said data may include data relating to the status of said signal input device.
  • This provides the advantage of enabling failure or low battery power of a signal input device to be communicated to the associated control unit to enable remedial action to be taken.
  • At least one said control unit may be adapted to transmit a timing signal to the or each said transmitter associated therewith to synchronise operation of the timing of said transmitters .
  • Said second control unit is preferably the control unit capable of radio communication with the largest number of said first control units.
  • the system in the event of failure of said second control unit, is adapted to transmit a said alarm signal to said first control units by sequentially transmitting said signal between said first control units.
  • At least one said signal input device may be a fire and/or smoke detector.
  • At least one said signal input device is preferably an alarm communication device.
  • the system may further comprise at least one alarm sounder for producing an audible alarm signal, said sounder being associated with a said control unit and adapted to be actuated by means of an actuation signal from the associated control unit .
  • At least one said alarm sounder may be adapted to receive electrical power intermittently according to a signal from the associated control unit.
  • This provides the advantage of enabling battery power of the alarm sounder to be preserved.
  • the system in use may carry out successive timing cycles in which each said transmitter sends a signal to the associated control unit.
  • a radio frequency alarm communication method comprising:
  • the method may further comprise the step of transmitting data from at least one said control unit to at least one other said control unit.
  • Said data may include a timing signal to synchronise operation of a plurality of said control units.
  • Said data may include an indication of the status of said control unit.
  • the method may further comprise the step of selecting said second control unit such that said second control unit is the control unit capable of radio communication with the largest number of said first control units.
  • the method may further comprise the step of transmitting a said alarm signal to said first control units by sequentially transmitting said signal between said first control units in the event of failure of said second control unit.
  • FIG. 1 is a schematic representation of a fire detection system embodying the present invention
  • Figure 2 indicates the content of a timing cycle used in the operation of the system of Figure 1;
  • FIGS 3A to 3J show more detailed information of the timing cycle of Figure 2;
  • Figure 4 is an illustration of the process of normal synchronisation of the system of Figure 1;
  • Figure 5 is an illustration of the synchronisation of the system of Figure 1 when a control panel fails.
  • a radio frequency wireless fire alarm system 1 has a series of control panels 2, shown in the figure as CPO to CP4, although it will be appreciated by persons skilled in the art that any number of control panels may be used.
  • Each of the control panels 2 is in radio communication with a series of associated fire detectors 3 arranged in a series of zones 4.
  • Each detector 3 has an associated radio transmitter, (not shown) so that the detectors 3 of each zone 4 can transmit radio frequency signals to the associated control panel 2, i.e. the detectors 3 of each zone 4 transmit to a single control panel 2 in normal operation of the system.
  • Each of the control panels 2 is designed to communicate with the detectors 3 in its associated zone 4 independently of the other control panels 2.
  • the control panel CPO is also in radio communication with each of the other control panels 2 to enable the control panels 2 to exchange alarm and status data with each other, in a manner which will be described in greater detail below. This enables a failure or alarm condition of one control panel 2 or detector 3 to be communicated to a control panel 2 of another zone 4. For example, if the zones 4 of the system 1 represent different buildings, a control panel in one building in which no alarm condition exists can be notified of a fire in another building.
  • each main timing cycle 10 consists of a series of sub periods 11.
  • the sub periods 11 are in turn divided into individual timing cycles 12, each of which is divided into individual time slots, typically of 75 ms duration.
  • These individual time slots include a broadcast slot 13 in which a synchronisation signal is broadcast by one or more of the control panels 2 (in the example shown in Figure 1, this will be control panel CPO, since it can communicate directly with each of the other control panels) to all of the other control panels 2 and detectors 3 in the entire system 1 to enable those other control panels 2 and detectors 3 to synchronise their operation to each other.
  • control panel 2 When a control panel 2 is not transmitting, it is in a receive mode during the broadcast slot 13 to receive broadcast signals from other control panels 2 which may be transmitting.
  • the broadcast slot 13 is followed by an alarm slot 14, which is used by control panels 2 for the reception of any alarm signal generated by any of the detectors 3 within the same zone 4 as the receiving control panel 2.
  • control panels 2 are always set to a receive mode during the alarm slot 14 in order to detect alarm signals.
  • An auxiliary slot 15 for distributing system information, update bulletins and the like follows the alarm slot 14.
  • the auxiliary slot 15 is also used for transmitting an alarm signal from one of the control panels CP1 to CP4 to the central control panel CPO, which is in a receive mode for the auxiliary slot 15 of each timing cycle.
  • the auxiliary slot 15 is then followed by a control/acknowledgement slot 16 for sending an acknowledgement signal to a detector 3 in response to generation of an alarm signal by that detector 3. This enables the detector 3 to switch off or otherwise cease to generate an alarm signal after the alarm signal has been communicated to the associated control panel 2.
  • a status slot 17 for each timing cycle 12 follows the control slot 16 and enables a single detector 3 to report its status (i.e. functioning correctly or not) to the associated control panel 2.
  • the status slot 17 is followed by a multi panel slot 18, which is used to distribute information between control panels 2. For example, an alarm or fault condition, resulting in the generation of a signal by a detector 3 in one zone 4, may be communicated to a control panel 2 in another zone 4. This enables personnel in that other zone (by means of a suitable display device at the control panel 2 in that zone 4) to become aware of an alarm or fault situation in the other zone 4.
  • the control panel CPO having received an alarm signal during an auxiliary slot 15, transmits that alarm signal onwards to other control panels CP1 to CP4 during the multi panel slot 18.
  • a timing cycle 12 exists for each detector 3 in the system, and a sub period 11 consists of a series of timing cycles 12 in which each control panel 2 communicates with a single associated detector 3.
  • the sub periods 11 are repeated for different detectors 3, and the number of sub periods 11 in each main monitoring period 10 is sufficient to enable each detector 3 in the system 1 to communicate with its associated control panel 2.
  • the detector 3 If one of the detectors 3 should detect a fire, however, the detector 3 transmits an alarm signal to its associated control panel 2, which then activates a telephone dialler to notify the fire brigade, and may also automatically close fire doors. If the associated control panel is, for example, CPl, CP1 then transmits the alarm signal to the central panel CPO in its auxiliary slot 15. The central control panel CPO then transmits the alarm signal to the other control panels CP2 to CP4 in the associated multi panel slot 18. Because the central control panel CPO transmits the alarm signal simultaneously to the other control panels CP2 to CP4 , not only is the alarm condition communicated to the other control panels much more rapidly than in the case of successive (i.e. non-simultaneous) transmission between control panels, but cumulative timing errors arising from such successive transmission are avoided.
  • the timer in panel CPl is allowed to run and indicates when it is time to send its broadcast signal.
  • Panel CPl then sends its broadcast signal and panel CP2 synchronises to it ( Figure 5b) .
  • Panel CP2 then sends its broadcast signal and panel CP3 synchronises to it ( Figure 5c) and panel CP3 sends its broadcast signal and panel CP4 synchronises to it ( Figure 5d) .
  • panel CPO If panel CPO then is reset, it wakes up into a detect mode in order to detect current broadcast packets to which it may re-synchronise itself, and synchronises from panel CP3. As shown in Figure 4e, panel CP4 then sends its broadcast signal, but no other panels synchronise to it. Finally, as shown in Figure 4f, all panels 2 then synchronise to panel CPO since synchronisation always occurs with the central panel if possible.

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  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Alarm Systems (AREA)
  • Fire Alarms (AREA)

Abstract

L'invention concerne un système d'alarme incendie sans fil radiofréquence (1) composé d'une pluralité de panneaux de commande (2) communiquant avec un ensemble de détecteurs d'incendie (3) disposés dans un ensemble de zones (4). Chaque détecteur (3) comporte un transmetteur radio et est conçu de manière à transmettre des signaux de fréquence radio au panneau de commande associé (2). Chaque panneau de commande (2) est conçu de manière à communiquer avec les détecteurs (3) dans la zone associée (4) au moyen de cycles de temporisation successifs, chaque panneau de commande étant par ailleurs en communication radio avec tous les autres panneaux de commande (2) de manière à permettre un échange de données d'alarme et d'état entre les panneaux de commande (2).
PCT/GB2002/001717 2001-04-18 2002-04-17 Systeme de communication alarme radiofrequence WO2002084620A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0109455.6 2001-04-18
GB0109455A GB2377305A (en) 2001-04-18 2001-04-18 Radio frequency alarm system

Publications (1)

Publication Number Publication Date
WO2002084620A1 true WO2002084620A1 (fr) 2002-10-24

Family

ID=9912941

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2002/001717 WO2002084620A1 (fr) 2001-04-18 2002-04-17 Systeme de communication alarme radiofrequence

Country Status (2)

Country Link
GB (1) GB2377305A (fr)
WO (1) WO2002084620A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102542746A (zh) * 2010-12-22 2012-07-04 霍尼韦尔国际公司 现场优化的可配置无线火灾系统

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007201692A (ja) * 2006-01-25 2007-08-09 Nec Computertechno Ltd アラーム信号制御方法および装置並びにこれを用いる電子機器

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0676733A1 (fr) * 1994-04-09 1995-10-11 Harrison Brothers (Steeplejacks) Ltd., Système de détection et son procédé de fonctionnement
WO2000021053A1 (fr) * 1998-10-06 2000-04-13 Slc Technologies, Inc. Systeme prive d'alarme de securite et d'incendie

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2271691A (en) * 1992-09-21 1994-04-20 Oconnor P J Synchronisation of a radio telemetry system
GB2292627A (en) * 1994-08-23 1996-02-28 Niagara Holdings Limited Security systems

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0676733A1 (fr) * 1994-04-09 1995-10-11 Harrison Brothers (Steeplejacks) Ltd., Système de détection et son procédé de fonctionnement
WO2000021053A1 (fr) * 1998-10-06 2000-04-13 Slc Technologies, Inc. Systeme prive d'alarme de securite et d'incendie

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102542746A (zh) * 2010-12-22 2012-07-04 霍尼韦尔国际公司 现场优化的可配置无线火灾系统

Also Published As

Publication number Publication date
GB0109455D0 (en) 2001-06-06
GB2377305A (en) 2003-01-08

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