EP0022026A1 - Alarmübertragungssystem - Google Patents

Alarmübertragungssystem Download PDF

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Publication number
EP0022026A1
EP0022026A1 EP80400958A EP80400958A EP0022026A1 EP 0022026 A1 EP0022026 A1 EP 0022026A1 EP 80400958 A EP80400958 A EP 80400958A EP 80400958 A EP80400958 A EP 80400958A EP 0022026 A1 EP0022026 A1 EP 0022026A1
Authority
EP
European Patent Office
Prior art keywords
transmission system
detection
frequency
reception
unit
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
Application number
EP80400958A
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English (en)
French (fr)
Other versions
EP0022026B1 (de
Inventor
Pierre André A.A. Morel
Marc Paul Lucien Pittavino
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.)
Agence Centrale De Services (acds) SA
Original Assignee
Agence Centrale De Services (acds) SA
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.)
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Publication date
Application filed by Agence Centrale De Services (acds) SA filed Critical Agence Centrale De Services (acds) SA
Priority to AT80400958T priority Critical patent/ATE12435T1/de
Publication of EP0022026A1 publication Critical patent/EP0022026A1/de
Application granted granted Critical
Publication of EP0022026B1 publication Critical patent/EP0022026B1/de
Expired legal-status Critical Current

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    • 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
    • G08B25/009—Signalling of the alarm condition to a substation whose identity is signalled to a central station, e.g. relaying alarm signals in order to extend communication range
    • 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

Definitions

  • the present invention relates to an alarm transmission system, comprising at least one detection assembly, equipped with detectors capable of delivering electrical signals when they are energized, a signal transmission assembly generated by the detection assembly or sets, and at least one receiver remote from the detection assembly, for receiving the signals transmitted by the transmission assembly.
  • detectors with radio transmission means to transmit a remote alarm.
  • detectors also mounted on a fixed station, generally have a very short transmission range and can only transmit a signal to a receiver located in the immediate vicinity of the detector, without allowing centralization and identification of the information transmitted in the event of implementation of several detectors mounted at a distance from each other.
  • the present invention specifically aims to remedy the various aforementioned drawbacks and to make it possible to produce a monitoring and alarm transmission system which is particularly convenient to install and which makes it possible both to centralize the information provided by the various detectors used and to ensure the reception of information supplied by the detectors from mobile reception points located at variable distances from the monitored areas.
  • the present invention also aims to achieve a monitoring and alarm transmission system entirely autonomous and independent of the infrastructure to be monitored, which allows overall monitoring while increasing operational safety and the speed of intervention in the event of triggering. alarm.
  • an alarm transmission system of the type mentioned at the start which, according to the invention, includes a plurality of autonomous, removable and portable detection units, a plurality of autonomous, portable reception modules capable of triggering signaling or alarm means incorporated in said reception modules when receiving signals transmitted by the set of transmission and a central information reception and processing unit equipped with at least one reception module, the signal transmission assembly further comprising, on the one hand, associated coding and radio transmission means to each detection unit and on the other hand by radio reception and decoding means incorporated in each portable reception module.
  • Such a remote transmission system with portable receivers constitutes a coherent set of transmission-reception of alarms which is flexible and efficient and whose basic configuration preferably includes at least electronic surveillance against intrusion.
  • Such a system which by its autonomy, its basic installation, its mobility and its radio frequency transmission, allows rapid and temporary intervention, and allows a change of configuration of the protection in a minimum of time, is suitable for operating in premises or sets of premises where the presence of security guards is necessary, for example warehouses, industrial sites with multiple buildings, industrial, commercial and suburban areas, large complexes, towers, museums, etc.
  • the frequency modulated binary information signals include a first frequency representing the state zero and a second frequency which is an integer multiple of the first frequency and represents the state one.
  • Two signals corresponding to the state one emitted by two detection units placed in two different detection zones are integer multiples of the first frequency different from each other.
  • the transmitted binary information signal comprises at least elements representative of a detection zone, of a station address in this detection zone and of a type of triggered alarm, as well as elements of control of the transmitted signal , including its parity.
  • Each detection unit includes at least one volumetric Doppler intrusion detector.
  • Each detection unit comprises at least one perimeter intrusion detector.
  • Each detection unit comprises at least one fire detector.
  • Each detection unit comprises means for locking or delaying the commissioning of this unit.
  • Each reception module is equipped with means for selecting detection zones so as to be sensitive only to signals emitted by communication units. detection located in specific areas.
  • Each reception module is equipped with acknowledgment means to stop the display or the alarm signal triggered.
  • Each reception module is in the form of a portable unit pluggable into the central unit and presenting all the control, display and reception antenna elements on a single face protected by a lateral flange and equipped with a grip handle.
  • the central unit comprises a printer for recording information received by at least one reception module plugged into the unit, and means for managing the information received.
  • FIG. 1 shows a schematic representation of a system for monitoring and remote transmission of alarms to portable receivers according to the invention.
  • Portable detection units 11, 12, 13 equipped with an autonomous and rechargeable power supply are completely removable and can be installed in selected locations in one or more zones to be monitored.
  • Each detection unit 11, 12, 13 is equipped with detectors and an encoder-transmitter capable of transmitting on radio frequency a coded message indicating the nature and the place of emission of the alarm, when a detector is excited by a disturbance to which he is sensitive.
  • Portable and autonomous reception modules 21, 22, 23 receive and display the signals transmitted by the detection units 11, 12, 13. Certain reception modules can be selective and react only to information signals transmitted from determined zones. Thus, in FIG. 1, the reception module 23 is only sensitive to the signals transmitted by the detection units 12, 13, while the reception modules 21, 22 are sensitive to the signals transmitted by the detection units 11 , 12.13.
  • reception modules 21, 23 of FIG. 1 are mobile and intended to be carried by itinerant security agents while the reception nodule 22, which can be completely identical to the modules 21 and 23, is plugged into a unit central processing unit 30 intended to control and centralize all of the information transmitted by the detection units 11,12,13.
  • the central processing unit 30 can itself be fixed or mobile depending on the site to be monitored. Thus, in the case of buildings or sets of buildings with a surface area on the ground allowing interventions that are fast enough for a security guard on foot, the central unit can be fixed. In the case of industrial zones, it can be mobile and installed in an emergency vehicle.
  • the alarm teletransmission system of FIG. 1 can naturally include a variable number of detection units 11,12,13 as well as reception modules 21,22,23.
  • the system is however particularly suitable for operating with a large number of detection units arranged at fixed points and a small number of mobile reception modules carried by surveillance agents.
  • a central control unit 30, and reception modules 21, 23 capable of circulating and passing successively within the field of action of the various detection units 11, 12, 13 makes it possible to ensure control almost permanent of the good functioning of the various devices while authorizing a rapid intervention on the place of an unauthorized alarm triggering, as will be explained in more detail below.
  • the complete removable nature of the various system components also allows rapid installation of the monitoring system, which can for example be removed during the day and set up at night with renewed configurations.
  • the system according to the invention is suitable for monitoring a site divided into zones, each zone being itself divided into a certain number of points each associated with a detection unit capable of emitting a certain information.
  • a monitoring system can ensure the centralization over the air of 2,560 pieces of information from 640 points distributed in eight zones of 80 points each.
  • Each reception module which can moreover be made selective so as to take into account only information coming from certain zones, is thus capable of displaying four information of different nature coming from any of the points of the site zones. to be taken into account.
  • FIG. 2 schematically represents the various components of a detection unit such as 11, 12 or 13.
  • a set 110 of detectors such as 111, 112 allows the production of electrical signals in response to disturbances of different natures.
  • the detector 111 is advantageously a volumetric intrusion detector including a microwave radar capable of detecting a movement made in its radiation lobe.
  • the detector 112 can be a perimeter intrusion detector constituted by an opening contact, a seismic detector, or even a fire detection loop.
  • Various types of detectors 111, 112 can thus be incorporated into the detection unit 11 depending on the applications envisaged.
  • the assembly 140 in FIG. 2 designates a current supply unit for the detection unit.
  • Block 140 includes a stabilized power supply 141 equipped with an autonomous battery, but can of course also be connected to a power supply network.
  • the assembly 160 of FIG. 2 represents means of remote control and of controlling the timed commissioning and the decommissioning of at least some of the detectors 111, 112.
  • the assembly 120 of FIG. 2 corresponds to the various electronic coding circuits necessary to take into account the information supplied from the assemblies 110, 160 and allow a transmission of a binary coded message by the transmitter 150.
  • the circuit 125 receives various information transmitted by the assemblies 110, 160, for example a signal emitted by a volumetric intrusion detector 111, a signal emitted by a fire detector 112, activation or deactivation information emitted by the unit 160.
  • This information is stored in memories 1 21 to 124 and managed by the circuit 126 which prioritizes the information in the event of simultaneity, the circuit 126 itself being connected to the alarm coding circuit 127 which ensures the coding of the nature of the information supplied by the circuit 126, and to the circuit 129 intended to generate a serial message taking into account the information coded by the circuit 127 and the address supplied by the circuit 128 and corresponding to the coordinates of the point monitored by the detection unit.
  • the circuit 130 provides FSK coding of the message to be transmitted and is connected via a low-pass filter 131 to a radiofrequency transmitter 152 provided with an antenna 151 and carrying out a transmission in frequency modulation in a UHF band or VHF.
  • the messages transmitted by the detection units 111, 112, 113 are picked up by at least one reception module 22 disposed in the central unit 30 and by one or more portable portable reception modules such as 21 or 23.
  • FIG. 3 represents the functional diagram of a portable and plug-in reception module in the central processing unit 30.
  • the stage 250 for receiving the frequency modulated messages comprises a conventional radio frequency receiver 252 provided with an antenna 251.
  • the logic processing unit comprises a demodulator circuit FSK..230 for ensuring the FSK decoding of the received LF message and providing a binary coded message BS to circuit 231 series-parallel conversion, which provides a first identification and is connected to a memory 221 as well as a second identification circuit 229 which allows the reception and taking into account of a second message when a first series of information is already displayed.
  • a locking signal can be transmitted by the circuit 229 to the converter 231 by the line 2290.
  • a control logic circuit 226 manages the transfer of information between the memory 221, the circuits 229, 231 and a decoding circuit 227 which controls the display of the information received.
  • the interface circuit 211 ensures the current supply of the indicators 213 to 216 in order to display the nature of the alarms triggered and emitted by the detection units 11, 12, 13 and picked up by the reception module.
  • An audible alarm 212 is also controlled by the circuit 211 to signal any reception of an alarm signal by the reception module.
  • a push button 260 also connected to circuit 211 allows an acknowledgment of the alarm which has been displayed, that is to say to stop the display of the alarm by indicating that the signal displayed has indeed been taken into account by the user.
  • a second interface circuit 217 displays on the table 218 the address of the point and the zone corresponding to the detection unit which has sent a message picked up by the reception module.
  • the power supply circuit 240 conventionally comprises circuits 241 for stabilizing and controlling the battery power supply, as well as possibly a logic circuit 242 supplying an indicator 243 for controlling the battery charge put into service when the reception node is used at a fixed station and is plugged into the central control unit 30.
  • FIG. 4 represents the block diagram of an example of a central control unit 30 which can be used in combination with the portable detection units 11, 12, 13 and the portable reception modules 21, 22, 23 to constitute a system centralized monitoring system.
  • the central control unit 30 comprises at least one reception module such as 22 capable of receiving any information transmitted by any of the detection units 11, 12, 13 of the system.
  • the reception module 22 thus ensures the visualization of any message received and also allows the recording of each message on a printer 32 controlled by means of the logic processing circuits 31 of the central unit 30.
  • the central unit can naturally be equipped with own receivers distinct from the reception modules such as 22 or 21.
  • the central unit 3Q ensures the reception of all the messages sent by the detection units, which may correspond in particular to either an activation, an alarm triggering, or an deactivation.
  • the central unit can still operate automatically by recording and dating all the information received.
  • the central unit advantageously ensures the recharging of the batteries of the plug-in portable reception modules capable of operating either permanently in combination with the central unit, or autonomously and mobile when carried by users. moving.
  • the very shape of the reception modules such as 21, which appears in FIG. 5, is adapted to the dual function of the modules: fixed station operation, autonomous operation.
  • the various display, signaling or control elements such as on-off button 64, operation indicator 65, zone indicator put into service 66, indicators for displaying the nature of the information received 213 to 216, table of display 218 of the address of the sending point of a message, acknowledgment push button 260, charge indicator 243, audible warning 212, antenna 251, are all grouped on a single face 61 of the built-in and portable module 21.
  • An external peripheral rim 62 provides protection for the signaling or control elements arranged on the face 61 and a handle 63 facilitates the gripping of the built-in module 21.
  • the presence of portable and autonomous detection units allows various locations and easily modifiable inside the site to be monitored; the availability of autonomous portable reception modules allows direct monitoring of the proper functioning of the detection units, by the surveillance agent who, during a round must, by his successive presence with each detection unit equipped with a intrusion detector, trigger the operation of each of these units and receive a message corresponding to the detection of its presence; and the centralizing reception module makes it possible to verify the successive triggering of the various detection units tested in a predetermined order by the wearer of a portable reception module.
  • a portable reception module allows rapid intervention in the event of an undetermined predetermined alarm.
  • the security of the transmission of messages between detection units and reception modules is improved, and the insensitivity to false alarms is increased, because there is a rigorous phase relationship between the carrier frequency LF used to transmit the messages and the binary information signal constituted by a succession of elements of the same duration dam p renating for example either a frequency of 400 Hz to represent a zero state , or a frequency multiple of 400 Hz, which can depend on the detection zone, for example 2000 or 1600 Hz, to represent a state one.
  • an FSK modulation system is thus implemented in which a single clock is taken into account in order to synchronize the frequencies defining the information signal.
  • FIG. 6 corresponds to an exemplary embodiment of part of the circuits of FIG. 2, that is to say shows circuits incorporated in a detection unit for developing a binary coded message and allowing its program.
  • Rotary switches 301, 302, 303 make it possible to display in the detection unit numbers representative of a zone number (switch 303) and of an address to identify the point where the detection unit is located at the inside said zone (switches 301 and 302 which, in the example shown make it possible to display a number having 7 bits in binary form).
  • a multiplexer 304, 305 of two times eight bits is connected following the switches 301, 302 to allow the development of a serial binary message.
  • the binary message which must be transmitted is, in the example considered, of the form represented in FIG. 8.
  • the significant part of the message, which is produced by the multiplexer 304,305 comprises a bit Z 2 corresponding to an indication of area, bits D 2 , D 1 , D 0 corresponding to a tens digit in the address of identification of the emission point, bits U 3 , U 2 , U 1 , U 0 corresponding to a digit of the units in l 'address of identification of the emission point, and two bits A 1 , A 0 corresponding to an indication of the nature of the alarm triggered.
  • the part of the binary message transmitted and actually decoded DEC further comprises a parity bit P, developed in the circuit 306 to which the various bits mentioned above are applied.
  • the message DEC further comprises, structure bits, namely in the case of FIG. 8, a first bit “1”, followed by three bits “O”, placed at the head of the message transmitted and effectively decoded DEC, and a bit "1" placed after the parity bit, at the end of the message actually decoded DEC, which thus comprises 16 bits.
  • the binary message MB is transmitted during the time or the transmitter command CE is in the state "1", that is to say in the example considered, for 400 ms.
  • the first bits of the binary message MB, which precede the part which will actually be decoded DEC include bits of random value and include a bit SY of synchronization.
  • the first four structure bits of the DEC part of the binary coded message MB are added to the significant bits of the message, at the NAND gate 307 to form the binary signal G which constitutes a binary message complete series.
  • the coded message MB can be generated three times in a row in 10 seconds. It is the counter 308 (FIG. 6), which performs the sequencing and controls the appearance of the transmitter control order during which the output of the multiplexer 304, 305 will be associated with the structure bits to form the message. binary MB.
  • the clock is blocked by the output signal E, which produces an end of transmission signal FE, and there is an erasure of the transmission request, thanks to the signal applied to the input of the clock C K of the counter 308.
  • the circuit 310 is constituted by a PLL circuit, that is to say a phase-locked loop, intended to allow FSK modulation to be carried out, that is to say to allow to produce a signal comprising a carrier whose frequency can correspond either at a predetermined lower frequency corresponding to a "zero" binary state, or at a predetermined higher frequency corresponding to a "one" binary state.
  • the upper frequency has the particularity of being a harmonic frequency of the lower frequency.
  • the circuit 310 is not directly controlled by the binary signal G formed, but this binary signal G is applied to the output routing circuit 311, to which are applied, on the one hand, a low frequency reference signal (400 Hz) generated to represent a binary state "1", on the other hand, a signal F whose frequency is an integer multiple of the frequency of reference (for example 1600, 2000, 2400 or 2800 Hz) and corresponds to a level "1".
  • a low frequency reference signal 400 Hz
  • a signal F whose frequency is an integer multiple of the frequency of reference (for example 1600, 2000, 2400 or 2800 Hz) and corresponds to a level "1".
  • the programmable divider 309 which is associated with the switch 303 and the PLL circuit 310 allows the formation of the harmonic frequency of the reference frequency (400 Hz), with a value depending on the values of the bits of Z 0 , Z 1 displayed by the switch 303.
  • the value of the high frequency will depend on the display made at the outset in the switch 303. It is thus possible to obtain from the value of the high frequency of the LF signal generated at the output, an indication relating to the zone in which the transmitter block.
  • the indication relating to the reference zone can also be included in a conventional manner in the message. binary comprising the coded address D 2 , D 1 , D 0 , U 3 , U 2 , U 1 , U 0 of the location of the transmitter in an area, rather than being carried by the multifrequency system.
  • the low frequency oscillation (400 Hz) serves as a phase reference for the circuit 310, and by the comparison between the low frequency oscillation and the harmonic produced by the circuit 309, makes it possible to lock in phase of the high frequency (for example 1600 Hz) and the low frequency (400Hz).
  • the coding of the LF signal between two frequencies is carried out in the switching circuit 311, to which the reference frequency signal (400 Hz) is applied to input 9 and the signal of high frequency (for example 1600 Hz) on input 6, without any discontinuity appearing when the passage from one frequency to another is controlled by the binary signal G.
  • the reference frequency signal 400 Hz
  • the rest of the sequencing are carried out from a single clock 312 which delivers pulses of period 1.25 ms) to the counter / divider 308, so as to allow a thorough check of the message sent.
  • the LF signal transmitted by a detection unit and picked up by a reception nodule comprises a succession of binary elements of fixed duration (20 ms in the example considered) which include an oscillation of 400 Hz (level "O") or multiple of 400 Hz (level "1").
  • the LF signal presents a rising edge for each change of binary state.
  • the receiver circuits will be able to ensure continuous control of the frequencies present in the message, thus eliminating any risk of triggering on parasitic signals not originating from the transmission system.
  • the monostable circuit 402 thus triggers on a rising edge and falls a little before a rising edge and regenerates a repetitive TP 1 clock signal regardless of the frequency of the TP 3 signal.
  • the TP 1 signal formed (FIG. 9) constitutes a measurement window for measuring the frequency received in the TP 3 signal.
  • the counter 403 can count the falling edges inside each window and according to the number (in the example considered, 1, 4,5,6. Or 7) which corresponds to the frequencies 400, 1600, 2000, 2400 or 2800 Hz, the bits corresponding to level "1" (when the number of falling edges is greater than 1) are detected and the bits Z 0 , Z 1 , relating to a zone address are regenerated, according to the number falling edges greater than 1 (in the case where the indication of the zone address is transmitted by means of high level frequencies of different values).
  • the circuit 407 corresponds to a binary-decimal decoding circuit.
  • the NOR gate 408 allows the production of an erasure signal Ef which clears the contents of the serial-parallel conversion shift register of the BS serial binary message.
  • This series-parallel shift register, contained in circuit 231 of FIG. 3 has a conventional structure and need not be described in more detail.
  • the divider circuit 406 makes it possible, from the signal TP 1 , to regenerate a clock signal at the frequency of the binary elements (50 Hz) in the decoder.
  • the NOR gate 409 of the circuit of FIG. 7 is designed to receive on its VAL and EFEX inputs respectively the complement to 1 of a validation signal and an external erase signal.
  • FIG. 9 represents the operating diagram of the circuit of FIG. 7 and shows the shape of the signals at different points of this circuit, in particular the shape of the input signal reshaped in the input stage 401 to constitute the signal TP 3 , the measurement window TP 1 , formed by the monostable circuit 402 from the frequency-modulated LF signal TP 3 , the shape of the signals at the various terminals of the circuit 403, the shape of the binary BS series signal reconstructed at the output of flip-flop "D" 405, the form of signals Z, z 1 indicating a zone address reconstituted at the output of flip-flops "D” 404, but which, according to an alternative embodiment using only a high frequency and a reference frequency for the modulation of the signal TP 3 could be included in the binary serial signal BS, the form of the erasure signal Ef, and the form of the clock signal CKI pacing the serial binary signal.
  • the various circuits of FIG. 3 other than the various elements for decoding and regenerating the serial binary signal and the clock signals can be produced in a conventional manner and will not be described in more detail.

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  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Alarm Systems (AREA)
  • Emergency Alarm Devices (AREA)
  • Fire Alarms (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
EP80400958A 1979-06-26 1980-06-26 Alarmübertragungssystem Expired EP0022026B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80400958T ATE12435T1 (de) 1979-06-26 1980-06-26 Alarmuebertragungssystem.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7916431A FR2460013A1 (fr) 1979-06-26 1979-06-26 Systeme de transmission d'alarmes
FR7916431 1979-06-26

Publications (2)

Publication Number Publication Date
EP0022026A1 true EP0022026A1 (de) 1981-01-07
EP0022026B1 EP0022026B1 (de) 1985-03-27

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EP80400958A Expired EP0022026B1 (de) 1979-06-26 1980-06-26 Alarmübertragungssystem

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US (1) US4358756A (de)
EP (1) EP0022026B1 (de)
JP (1) JPS5638691A (de)
AT (1) ATE12435T1 (de)
BR (1) BR8003977A (de)
CA (1) CA1167544A (de)
DE (1) DE3070379D1 (de)
DK (1) DK272180A (de)
ES (1) ES8102754A1 (de)
FR (1) FR2460013A1 (de)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2503428A1 (fr) * 1981-04-03 1982-10-08 Hamon Nicolas Systeme d'alarme a distance
GB2124002A (en) * 1982-06-30 1984-02-08 Secom Co Ltd A portable emergency-indicating apparatus
GB2171548A (en) * 1985-02-22 1986-08-28 Leonard Fredrick Burge Tyre inflation alarms
EP0378465A1 (de) * 1989-01-09 1990-07-18 AEROSPATIALE Société Nationale Industrielle Modularüberwachungssystem für industrielle Einrichtungen
FR2642547A1 (fr) * 1989-01-09 1990-08-03 Aerospatiale Systeme modulaire de surveillance d'installations industrielles
FR2708774A1 (fr) * 1993-08-05 1995-02-10 Guillo Jean Dispositif de sécurité à liaison radio bi-directionnelle.
EP0675469A1 (de) * 1994-03-24 1995-10-04 Baumer Holding AG Funkalarm-Sicherheitssystem
US5774050A (en) * 1994-03-24 1998-06-30 Baumer Holding Ag Radio alarm security system

Also Published As

Publication number Publication date
US4358756A (en) 1982-11-09
DK272180A (da) 1980-12-27
ES492831A0 (es) 1981-02-16
FR2460013A1 (fr) 1981-01-16
FR2460013B1 (de) 1984-11-02
EP0022026B1 (de) 1985-03-27
DE3070379D1 (en) 1985-05-02
BR8003977A (pt) 1981-01-13
ATE12435T1 (de) 1985-04-15
CA1167544A (fr) 1984-05-15
ES8102754A1 (es) 1981-02-16
JPH0237000B2 (de) 1990-08-21
JPS5638691A (en) 1981-04-13

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