EP0772853A1 - Perfectionnements aux detecteurs d'alarme pour la surveillance de batiments - Google Patents
Perfectionnements aux detecteurs d'alarme pour la surveillance de batimentsInfo
- Publication number
- EP0772853A1 EP0772853A1 EP95926441A EP95926441A EP0772853A1 EP 0772853 A1 EP0772853 A1 EP 0772853A1 EP 95926441 A EP95926441 A EP 95926441A EP 95926441 A EP95926441 A EP 95926441A EP 0772853 A1 EP0772853 A1 EP 0772853A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- central unit
- alarm
- program
- detector
- transistor
- 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.)
- Granted
Links
- 239000004020 conductor Substances 0.000 claims abstract description 22
- 230000000295 complement effect Effects 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 230000004913 activation Effects 0.000 abstract 1
- 238000009434 installation Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
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
- G08B25/04—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 a single signalling line, e.g. in a closed loop
-
- 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
Definitions
- the present invention relates to alarm detectors for monitoring buildings, in particular for detecting fires or possibly for detecting intrusions.
- the invention relates to such an alarm detector which comprises first and second connection members intended to be connected respectively to two conductors forming a pair of conductors which is kept energized by an alarm center, the alarm detector further comprising a switch connected in series with at least one resistor between the first and second connection members, the alarm detector also comprising an alarm sensor connected to a programmable central unit to transmit a signal to it indicates the existence or not of an event which should trigger an alarm, the central unit comprising an output which controls the switch according to the signal received from the alarm sensor.
- Alarm detectors of this type fall into two categories:
- the so-called current loop detectors intended to keep the above-mentioned switch closed for a predetermined duration when an alarm is detected, which causes an increase in the electric current flowing in the pair of conductors, which increase current is detected by the alarm center,
- the so-called addressable detectors designed to sequentially close or open the aforementioned switch when an alarm is detected, so as to generate in the pair of conductors a binary coded signal which allows the alarm center to identify the detector that detected an alarm.
- Known alarm detectors are specifically designed to operate, one in a current loop, the other as addressable detectors: for the manufacturers of these detectors, it is therefore necessary to provide two separate production lines, and for these manufacturers or Detector installers, it is also necessary to provide two separate stocks for the two types of detectors.
- the present invention aims in particular to remedy these drawbacks.
- the central unit is designed to accommodate at least one or the other of two programs, namely:
- the alarm detector being designed to be able to operate both according to the first program and according to the second program, and said alarm detector also comprising selection means for operate the central unit either according to the first program or according to the second program.
- the switch is a transistor whose emitter and collector are connected in series with the resistance between the first and second connection members, the output of the central unit being connected to the base of the transistor to activate or not this transistor either with a DC voltage, either with a sinusoidal voltage, the selection means making it possible to operate the central unit so that it activates the transistor either with the DC voltage or with the sinusoidal voltage;
- the output of the central unit is provided to activate the transistor with sinusoidal voltages having at least a first frequency and a second frequency, the central unit being arranged to accommodate a third program according to which the transistor is activated sequentially by the output of the central unit by sinusoidal voltages having respectively the first and second frequencies when the sensor transmits to the central unit a signal indicating an event which should trigger an alarm, the selection means making it possible to operate the central unit either according to the first program, either according to the second program or according to the third program;
- the first, second and possibly third programs are contained simultaneously in the central unit, the selection means being provided to indicate to the central unit whether it should use the first or the second program or possibly the third program;
- the central unit includes a memory which contains a selection code indicating the operating mode of the fire detector, this selection code constituting the aforementioned selection means: it is therefore difficult to modify the selection code for a user of the alarm detector it is very unlikely that this user disturbs the proper functioning of his alarm system by unintentionally modifying the selection code contained in the memory of the central unit;
- the alarm detector further comprises an interface which is adapted to communicate with an external device provided with a complementary interface, for modifying the selection code contained in the memory of the central unit;
- the selection means comprise at least one selection switch connected to the central unit;
- FIG. 1 is a schematic view showing an example of an alarm detector according to the invention, the alarm center to which it must be connected, as well as a programming unit which can optionally be connected to the alarm detector, and - Figures 2 to 4 show the signals received by the alarm center when the detector signals an alarm, in different modes of operation of this detector.
- the alarm detector 1 is intended to be connected to an alarm center 5 via a pair 2 of conductors 3, 4 which extends between a first end 2a where the two conductors 3, 4 are connected respectively to two terminals 5a, 5b of the alarm center, and a second end 2b where the two conductors 3, 4 are connected to each other by a resistor R .
- a resistor R a resistor
- the two terminals of the resistor RO are connected to the two inputs 9a and 9b of a voltage amplifier 9, the output 9c of which is itself connected to an analog input 10a of a microprocessor 10, which thus receives a voltage representative of the current i.
- the sensor 1 is connected to the pair 2 of conductors by means of four terminals 3a, 3b, 4a, 4b, the conductor 3 being connected on the one hand to the terminal 3a and on the other hand to the terminal 3b, and the conductor 4 being connected on the one hand to the terminal 4a and on the other hand to the terminal 4b.
- terminals 3a and 3b are connected to each other in short circuit, as are terminals 4a and 4b.
- the alarm detector 1 further comprises a sensor 7 intended to detect an event which should trigger an alarm.
- This sensor can for example be a fire sensor, in particular an ionic smoke detection sensor, an optical smoke detection sensor, or a thermal sensor, or else this sensor can be an intrusion sensor such than a radar sensor, an ultrasonic sensor, an infrared sensor, or a simple door or window opening contact, etc.
- the alarm detector is a fire detector and that the sensor 7 is itself a fire sensor.
- the fire detector 1 comprises a microprocessor 6, which has an input 6a connected to the sensor 7.
- the sensor 7 transmits to this input 6a an electrical signal, for example a voltage, which is susceptible to indicate to microprocessor 6 the existence of a fire in the vicinity of the fire detector.
- This electrical signal can be an analog signal representative of a physical quantity measured by the sensor 7, in which case the input 6a is an analog input. If necessary, the signal transmitted by the sensor 7 to the input 6a could be a binary signal, in which case the input 6a would simply be a logic input.
- the microprocessor 6 has an output 6b which is connected to the base of a transistor T whose emitter and collector are connected in series with at least one resistor Ri between conductors 3 and 4.
- the microprocessor 6 is programmed to detect the presence or absence of a fire in the vicinity of the detector 1 as a function of the signal received at its input 6a.
- microprocessor 6 contains at least two programs which determine its operating mode when it detects a fire.
- the detector 1 operates in a "current loop", and the transistor T is kept constantly activated by the output 6b of the microprocessor for a predetermined duration, for example one second, when a fire is detected. .
- the resistance RO of the alarm center receives a signal if represented in FIG. 2, consisting of an increase in the current i by a value ⁇ .
- the detector 1 operates as an "addressable detector", and the output 6b of the microprocessor activates and deactivates the transistor T sequentially at a rapid rate when a fire is detected, to generate a binary coded signal s2 identifying the detector in the pair 2 of conductors, as shown in FIG. 3.
- This signal s2 is constituted by successive increases and decreases in the current i passing through the resistor RO of the alarm center.
- the signal si or s2 which results in variations in the intensity i passing through the resistance RO, is transmitted to the analog input 10a of the microprocessor 10 of the alarm center in the form of a voltage signal, so that the microprocessor 10 can detect the passage into alarm state of detector 1.
- the microprocessor 10 is able to identify exactly the detector which has entered the alarm state.
- the first and second programs are both loaded into the microprocessor 6.
- the microprocessor 6 is indicated with which of the first and second programs it must operate, by writing a selection code in a non-volatile memory 6c of said microprocessor, in particular a memory of the EEPROM type.
- This memory 6c can possibly be external to the microprocessor 6.
- an external programming box 14 can be used, for example, comprising in particular a screen 14a and a keyboard 14b, connected by a cable 15 to an interface connector 13 which can be connected to a complementary connector 12 provided in the detector 1.
- This connector 12 is connected to the microprocessor 6 to allow said microprocessor to communicate with the external programming unit 14.
- the output 6b of the microprocessor can be provided to bias the transistor T with a voltage either direct or sinusoidal to activate it, the selection code contained in the memory 6c or possibly the switches 16 making it possible to indicate to the unit central if it must activate the transistor T with the DC voltage or with the sinusoidal voltage.
- the signal if aforementioned which is produced in the event of an alarm when the detector operates in current loop is constituted by a sinusoidal current during the predetermined duration of generation of this signal , and when the detector operates as an addressable detector, the aforementioned signal s2 is replaced by a succession of sinusoidal current and direct current.
- the output 6b of the microprocessor can also be provided to activate the transistor T with sinusoidal voltages having at least a first frequency f1 and a second frequency f2.
- the microprocessor 6 then contains a third program according to which the transistor T is activated sequentially by the output 6b by means of sinusoidal voltages having respectively the first and second frequency when a fire is detected, the selection code contained in the memory 6c or possibly the switches 16 making it possible to indicate to the microprocessor 6 whether it should operate using the third program.
- a signal s3 such as that shown in FIG. 4 is received by the resistor RO.
- This signal s3 is constituted by a succession at a rapid rate of sinusoidal currents having the frequencies fl and f2 respectively, according to a binary coded signal making it possible to identify the detector 1 which emitted the signal s3.
- the first, second and third programs may not be simultaneously contained in the memory of the microprocessor 6, in which case only one of these programs would be loaded into the microprocessor, for example at the time of sale or installation. of the detector.
- This loading can be carried out by the aforementioned connector 12 or by any other means of communication, possibly by the pair 2 of conductors if the detector includes means (not shown) for receiving information by this channel.
- the selection means which make it possible to choose the operating mode of the detector are constituted by the communication means which make it possible to load the corresponding program in the microprocessor.
Landscapes
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Alarm Systems (AREA)
- Fire Alarms (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9409474A FR2723232B1 (fr) | 1994-07-29 | 1994-07-29 | Perfectionnements aux detecteurs d'alarme pour la surveillance de batiments |
FR9409474 | 1994-07-29 | ||
PCT/FR1995/001015 WO1996004629A1 (fr) | 1994-07-29 | 1995-07-27 | Perfectionnements aux detecteurs d'alarme pour la surveillance de batiments |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0772853A1 true EP0772853A1 (fr) | 1997-05-14 |
EP0772853B1 EP0772853B1 (fr) | 1998-06-24 |
Family
ID=9465922
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95926441A Expired - Lifetime EP0772853B1 (fr) | 1994-07-29 | 1995-07-27 | Perfectionnements aux detecteurs d'alarme pour la surveillance de batiments |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0772853B1 (fr) |
DE (1) | DE69503137D1 (fr) |
ES (1) | ES2120761T3 (fr) |
FR (1) | FR2723232B1 (fr) |
WO (1) | WO1996004629A1 (fr) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5831546A (en) * | 1996-05-10 | 1998-11-03 | General Signal Corporation | Automatic addressing in life safety system |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE8202566L (sv) * | 1982-04-23 | 1983-10-24 | Ericsson Telefon Ab L M | Forfarande och anordning for att i en slingkrets med ett forutbestemt antal parallellkopplade detektorer identifiera en larmande detektor |
FR2570505A1 (fr) * | 1984-09-17 | 1986-03-21 | Rouvet Jacques | Circuit a boucle de courant transmetteur d'informations |
US4999607A (en) * | 1987-12-07 | 1991-03-12 | Biotronics Enterprises, Inc. | Monitoring system with improved alerting and locating |
-
1994
- 1994-07-29 FR FR9409474A patent/FR2723232B1/fr not_active Expired - Fee Related
-
1995
- 1995-07-27 WO PCT/FR1995/001015 patent/WO1996004629A1/fr active IP Right Grant
- 1995-07-27 ES ES95926441T patent/ES2120761T3/es not_active Expired - Lifetime
- 1995-07-27 DE DE69503137T patent/DE69503137D1/de not_active Expired - Lifetime
- 1995-07-27 EP EP95926441A patent/EP0772853B1/fr not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO9604629A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE69503137D1 (de) | 1998-07-30 |
EP0772853B1 (fr) | 1998-06-24 |
WO1996004629A1 (fr) | 1996-02-15 |
FR2723232A1 (fr) | 1996-02-02 |
FR2723232B1 (fr) | 1996-10-18 |
ES2120761T3 (es) | 1998-11-01 |
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