EP0729124A1 - Wireless hazard signalling system and method - Google Patents

Abstract

The alarm system has a central station Ä1Ü that has a receiver and a transmitter Ä11Ü. The receiver is coupled by non contact communication paths to a variety of sensors and detectors, e.g. motion detectors Ä21Ü, contact detectors Ä20Ü, smoke detectors Ä22Ü, temperature and water sensors Ä23Ü. In addition the system has a manual transmitter Ä5Ü, a remote controller Ä8Ü and a code transmitter Ä8Ü. The system also has a universal receivers Ä710, 70Ü for optical and acoustic information. To check the against disturbances the system has a transponder for test signals. Protection against disturbing noise signals is enhanced by the use of two communication signals of different frequencies and the use of a deactivation phase.

Description

The invention relates to a wireless hazard detection system with a reporting center and at least one reporting device, the reporting center receiving and evaluating a radio message emitted by the reporting device in the event of a reporting event, and to a method for wireless hazard reporting, with a radio report when a reporting event occurs Event and then evaluated.

Such alarm systems and procedures are used, for example, to submit intrusion, fire, home automation or other malfunction reports or for emergency call signaling.

Previously common wireless hazard detection systems have technically very simple radio modules that can easily be influenced by interference fields, such as those caused by local oscillators, television sound carriers or computer clock signals and their harmonics.

Therefore, either the false alarm rates of such hazard alarm systems are high or their reception is so disturbed that the alarm message of an alarm device cannot be received by the alarm center at all.

For reasons of reliability, the wired hazard alarm systems have therefore been given a delay compared to the wireless ones, although the wired systems have the disadvantage of high installation effort and thus little flexibility.

In the German trade magazine "W&S", edition 10/94, pages 1058 to 1061, a wireless hazard detection system of the type mentioned at the beginning with improved interference immunity is described.

5 shows a block diagram of such an alarm system with a message center 1 and various message devices such as sensors 2 (motion detectors, glass break sensors or door contact sensors), an emergency transmitter 5 and a radio lock transmitter 6, which automatically sends a radio signal to activate the alarm system when a door of the building to be secured is locked.

Each signaling device that takes part in radio communication identifies itself with an individual code, a so-called unique code. In an installation mode, the alarm center 1 teaches in all existing alarm devices.

The transmission channel is permanently monitored by the alarm center 1 for malfunctions or tampering due to unauthorized access and the user is constantly informed about the effectiveness of the security by means of a display.

When a report-relevant event occurs, i.e. when a sensor is triggered, the sensor in question emits a short, coded radio signal, which is received by the signaling center and with regard to emitting an alarm via a signaling device 7 (flashing light and / or siren) and / or forwarding the alarm message via a public telephone network 4 is evaluated.

The alarm message is forwarded via the telephone network 4 via a telephone dialing device 3.

With such complex signal coding methods, however, only the security against false alarms or the deliberate transmission of a fake code signal by a third-party transmitter is increased.

The problem of the system being blocked by an external jammer cannot be solved by signal coding. A block is displayed on the control panel 1 after a certain period of time, but does not trigger an alarm.

According to FTZ guideline 17 TR 2100 for "telecontrol radio systems of low power of non-public mobile land radio (nömL) "it is only permitted for alarm purposes to transmit radio signals in one direction for a maximum period of 30 seconds.

For this reason, the alarm devices of the wireless hazard alarm system only send in the event of an alarm, i.e. only when they are triggered, a short radio signal with a maximum duration of 30 seconds, whereby a duration of approximately 1 second is usually selected.

In order to minimize battery consumption, the signaling devices are deactivated for a predetermined period of time after an alarm signal has been given and put into a so-called "sleep state".

This fact can be used to advantage by a potential burglar in the following manner.

The burglar disrupts the hazard alarm system by a jamming transmitter in such a way that the signals of the alarm devices from the alarm center 1 can no longer be identified. It is therefore impossible to trigger an alarm and the system is blocked. After the approx. 1 second transmission time has elapsed, the activated signaling sensors are put into sleep mode so that the burglar can switch off the jamming transmitter and pass through the deactivated signaling devices without triggering an alarm.

Since the external signal is usually only reported after an external signal has been active for 30 seconds, it is therefore possible to pass through the hazard detection system without triggering any alarm or displaying a fault.

According to the article "EMC" in the British trade magazine "RADIO COMMUNICATION", February 1995, pages 76 to 78, it has also often been found in the practical use of previous wireless hazard detection systems that in the wireless hazard detection systems according to CEPT (European Conference of Postal and Telecommunications Administrations) assigned UHF frequency band between 433.05 and 434.79 MHz, interference often occurs due to harmonic frequency components of local oscillators and computer clock signals as well as television sound or television picture carrier frequencies, which lead to a blocking of the hazard detection system.

However, an increase in reliability with regard to blocking the system by third-party transmitters cannot be achieved by more complex signal coding of the alarm signals.

It is therefore an object of the invention to develop a wireless hazard detection system and a notification method of the type mentioned at the outset in such a way that increased interference immunity with regard to blocking by external signal interference is made possible.

This object is achieved by a signaling device according to the preamble of claim 1, characterized in that the radio message emitted by the signaling device consists of at least two radio signals of different frequencies.

The object is also achieved by a signaling center according to the preamble of claim 8, characterized in that the signaling center receives and evaluates at least two radio signals of different frequencies as radio messages.

Furthermore, the object is achieved by a method for wireless hazard reporting according to the preamble of patent claim 30, characterized by the steps of generating at least two radio signals of different frequencies as radio messages, transmitting both radio signals when the event relevant to the alarm occurs, and evaluating both radio signals with regard to a signaling requirement.

By transmitting the radio message by means of two radio signals of different frequencies, blocking of the system by an external jammer can be largely avoided, since the probability of a simultaneous interference on both frequency channels is extremely low. Thus, at least one radio signal is available for evaluation even if an external interference signal is present.

In addition, a blocking of the signal transmission from the signaling center 1 to the signaling device 7 can be prevented by a transmission device for the multi-frequency transmission of the signaling control signal, so that hard wiring is not necessary.

The use of two radio signals enables a more selective signal evaluation, the greater the frequency spacing between the two radio signals, the higher the interference immunity of the hazard alarm system. In the case of an external jammer as well, the control center 1 can thus receive and evaluate at least one of the two radio signals and, if appropriate, trigger an alarm.

Furthermore, due to the resulting reduced requirements with regard to the susceptibility to interference of the transmission code, a complex coding method and thus a microprocessor control of the message center can be dispensed with.

This is particularly advantageous since it avoids the problem of reduced reception sensitivity due to the interference caused by high-frequency internal clock signals from the microprocessor-controlled systems.

In addition, the waiver of a microprocessor control leads to a cost minimization, since the development costs are reduced and additional costs due to increased approval requirements of the Association of German Property Insurers (VdS) are eliminated.

A deliberate blocking of both frequency channels by means of a jammer by a potential burglar with the aim of decommissioning the system can lead to an alarm immediately, since the probability of a simultaneous, accidental blocking of both frequencies can be almost completely ruled out. This makes it possible to differentiate between an intended fault and an unintentional one.

Alternatively, the above object is achieved by a signaling device according to the preamble of patent claim 7, characterized by a setting device by means of which a number of radio messages which can be reissued can be set until a deactivation period (sleeping time) occurs and / or the duration of the deactivation period.

Due to the changeability of the sleep time and the number of possible new alarm signal deliveries before the start of the sleep time, the risk of deliberate blocking of the signaling device by an external signal and subsequent passage of the signaling device during the sleep time is enormously reduced, since an intruder is detected again after the end of the blockage which leads to the repeated output of a message signal.

Furthermore, the adjustability of the sleep time enables the signaling device to be adapted to the hazard potential of the area to be monitored, which means that the overall energy consumption can be minimized.

Likewise, the above-mentioned object is achieved by a wireless hazard alarm system according to the preamble of claim 21, characterized by a test transmitter which emits a radio test signal of at least one frequency when the signaling center detects an external signal, in order thereby to check the availability of the transmission channel.

The provision of a test transmission device for automatically checking the transmission channel when a External signals enable the hazard detection system to be recognized immediately, regardless of the activation of a reporting device. This means that the system can be blocked even in the non-critical state and suitable countermeasures can be initiated.

Further advantageous embodiments of the invention are defined in the subclaims.

• Fig. 1 ein Blockschaltbild einer drahtlosen Gefahren-Meldeanlage gemäß dem Ausführungsbeispiel;
• Fig. 2 eine perspektivische Ansicht und eine teilweise geöffnete Seitenansicht eines Empfangsteils der Meldezentrale gemäß dem Ausführungsbeispiel;
• Fig. 3 eine Vorderansicht eines Anzeigefelds der Meldezentrale;
• Fig. 4A eine Vorderansicht eines Bewegungsmelders gemäß dem Ausführungsbeispiel;
• Fig. 4B eine Vorderansicht des Bewegungsmelders nach Entfernung der Frontplatte und der Sensoreinheit sowie eine Seitenansicht der im Inneren des Bewegungsmelders befindlichen Platinenanordnung;
• Fig. 4C eine Vorderansicht des Bewegungsmelders nach Entfernung der Frontplatte, der Sensoreinheit und der inneren Platinenanordnung; und
• Fig. 5 ein Blockschaltbild einer drahtlose Gefahren-Meldeanlage gemäß dem Stand der Technik.

The invention is explained below using an exemplary embodiment with reference to the accompanying drawings. Show it:

• Figure 1 is a block diagram of a wireless hazard detection system according to the embodiment.
• 2 shows a perspective view and a partially opened side view of a receiving part of the signaling center according to the exemplary embodiment;
• Fig. 3 is a front view of a display panel of the control panel;
• 4A shows a front view of a motion detector according to the exemplary embodiment;
• 4B shows a front view of the motion detector after removal of the front plate and the sensor unit and a side view of the circuit board arrangement located inside the motion detector;
• 4C shows a front view of the motion detector after removal of the front plate, the sensor unit and the inner circuit board arrangement; and
• Fig. 5 is a block diagram of a wireless hazard detection system according to the prior art.

A block diagram of the wireless hazard warning system according to the invention in accordance with an embodiment is shown in FIG. 1.

The hazard detection system consists of a control center 1 with a receiving part 10 and a transmitting part 11, one or more motion detectors 21, contact detectors 20, smoke detectors 22 and temperature or water detectors 23 as detection devices, a hand transmitter 5, a remote control 8 and a lock transmitter 6 as Control devices of the hazard alarm system, as well as a universal receiver 710 for an optical and acoustic signaling device 71 and an optical and acoustic signaling device 70 with an integrated universal receiver. To check the availability of the transmission channel when exposed to external signals, the control center 1 is equipped with a test transmitter, which is used in connection with a remote test receiver or transponder 24 for checking.

The receiving part 10 of the signaling center 1 has two antennas 90 and 91 for two-frequency operation. Furthermore, a display panel 100 and a key switch 110 for activating (arming) or deactivating (disarming) the hazard alarm system are arranged on the front of the housing.

Furthermore, the receiving part 10 of the signaling center 1 is equipped with an internal tone generator with volume control and an acoustic signal transmitter, such as a piezo buzzer, arranged on a main circuit board.

The alarm devices send out an alarm signal, a third-party warning signal (sabotage signal) or a battery discharge warning signal on two different frequencies when a corresponding alarm-relevant event occurs.

The reception of one of these signals by the control center 1 on both frequency channels leads to a corresponding signaling.

Depending on the geographical use of the hazard alarm system and the associated national frequency usage regulations, frequencies from the following frequency range pairings can be used in dual-frequency operation, with one of the frequency values being used in a single-frequency operation that is also possible: Germany, Austria, Switzerland: 40/433 MHz Great Britain: 173/418 MHz France: 152/433 MHz

If one of these signals is disturbed by the influence of external signals in the deactivated operating state of the system, this is indicated by an optical external signal fault display on the display panel 100. If the disturbance lasts longer than 30 seconds, there is an acoustic signal using the internal tone generator of the alarm center 1. If the signals of both frequencies are disturbed, the acoustic signal is given immediately.

Of course, a hazard alarm system is also conceivable in which the radio message consists of more than two radio signals of different frequencies.

According to regulations, the transmitters of the signaling devices may only emit a radio signal for a maximum of 30 seconds. Therefore and for reasons of energy saving, the motion detectors 21 are put into a temporary deactivation state (sleep time) after an alarm signal has been given.

However, in order to avoid the above-mentioned possibility of blocking the hazard alarm system by an external signal with the aim of subsequently passing the motion detector 21, which has now been deactivated, both the duration of the sleep and the number of possible alarm signal outputs before initiating the sleep time can be predetermined, although only one another alarm trigger, but not a signal extension is possible.

This enables an intruder to be detected two or more times before the motion detector is put into the idle state.

The sleep time of the motion detectors can, for example, be set in 3 steps between 1 and 6 minutes.

Is the hazard alarm system in the activated, i.e. armed, operating state, for example, an evaluation can be carried out in such a way that an alarm signal must be received on both frequency channels in order to cause an alarm, unless one of the frequency channels is disturbed by an external signal. An external signal interference on one frequency channel combined with the reception of an alarm signal on the other frequency channel can be evaluated as an alarm condition and thus lead to an alarm.

Since the alarm center 1 evaluates both the alarming and the disturbed frequency channel, it is also possible to put the hazard alarm system into a pre-alarm state for a period of 30 seconds, during which the reception of a second alarm signal from the corresponding or another motion detector leads to an alarm.

This means that if an intruder remains in the detection range of the alarm system, with or without maintaining the blocking attempt, another alarm signal is emitted by the same or, if the intruder quickly changes location, by another motion detector, which then results in an alarm .

If an external signal interference is detected on both frequency channels, this can also be evaluated as an alarm condition and thus lead to an alarm, since it is highly likely that it is an intended interference.

An intended external signal interference with the aim of blocking the hazard alarm system can therefore be reliably distinguished from an unintentional external signal interference.

The above-mentioned measures can significantly reduce the susceptibility to interference with external signal interference from external electromagnetic interference sources.

With lower security requirements, the hazard alarm system can also be operated in the single-frequency operating mode, each of the alarm devices emitting an alarm signal, a sabotage signal or a battery discharge warning signal on one frequency.

The reception of one of these signals by the control center 1 leads to a corresponding signaling.

If one of the signals in the deactivated state of the hazard alarm system is disturbed by external signal effects for longer than 30 seconds, there is an optical and an acoustic signal generated by the internal tone generator.

In the activated operating state of the hazard alarm system, an external signal fault leads to a display and / or a delayed alarm if the fault persists for more than 30 seconds.

To increase security, so-called detector monitoring can also be carried out, in which the notification devices emit a notification signal at a random point in time within a predeterminable period of time, for example 6 hours, and thus signal their operational readiness.

This is possible both in single-frequency and in dual-frequency operation.

If, in the deactivated state of the hazard alarm system, more than one alarm signal of an alarm device is not received by the alarm center 1, an alarm monitoring fault signal is generated which indicates an alarm group belonging to the alarm device concerned.

In the activated operating state of the danger alarm system, the generation of the detector monitoring fault signal can result in a full alarm or a fault display by means of a visual display when the danger alarm system is subsequently deactivated.

The hazard alarm system can be radio-controlled or wired.

The key switch 110 has three switch positions for deactivating, partially activating (internal alarm) or resetting the hazard alarm system.

Furthermore, the receiving unit 10 of the signaling center 1 comprises three wired inputs for fully activating (external alarm), partly activating (internal alarm) or for activating the alarm groups that do not belong to the partly activated (two-zone circuit). These inputs are controlled and monitored, for example, via a switched terminating resistor.

In addition, both full activation and partial activation are possible by radio control.

• ein Handsender 5 mit vier Tasten zum Deaktivieren, Vollaktivieren, Teilaktivieren und zur Überfallmeldung;
• ein Schloßsender 6, der mit einem mechanischen Schließkontakt gekoppelt ist; und
• eine ferngesteuertes Codierschloß 8.

For example, the following radio transmitters can be used to activate the hazard alarm system:

• a hand-held transmitter 5 with four buttons for deactivating, fully activating, partially activating and for reporting a robbery;
• a lock transmitter 6 coupled to a mechanical make contact; and
• a remote-controlled coding lock 8.

The lock transmitter 6 can be constructed in accordance with the contact detector, with the exception of the lock monitoring input, which is replaced by an input for a remote key switch contact. The lock transmitter 6 can transmit both an activation and a deactivation signal to the alarm center 1 and can be programmable in such a way that it emits a signal for partial or full activation of the hazard alarm system.

The remote-controlled coding lock 8 enables the system to be activated wirelessly using three different codes, partial activation, full activation or only activation of the detection groups programmed for complete alarming being selectable. A raid report to reporting center 1 is also possible.

To further increase the reliability of the hazard alarm system with regard to external signal interference, an external signal checking system consisting of a test transmitter and a test receiver 24 can also be provided, the test transmitter being able to be arranged in the reporting center 1.

The test receiver 24, which in turn can contain a transmitting device and thus performs a transponder function, is preferably arranged within the monitoring area of the hazard alarm system at a distance from the alarm center 1 that corresponds to the greatest radio range of the system.

If the control center 1 receives an external signal, the test transmitter is activated, which then sends a test signal on one or two frequencies depending on the operating mode. The test receiver 24 receives the test signal and, if received sufficiently, in turn sends one or more test signals back as an acknowledgment.

Acknowledgment can also be made via a wired signal, which, however, increases the installation effort for the hazard alarm system.

If the alarm center 1 does not receive an acknowledgment, the transmission path for alarm signals is blocked and an external signal can be displayed regardless of the occurrence of an alarm-relevant event, so that early warning of the blocking of the hazard alarm system is made possible.

In two-frequency detector monitoring mode, two radio test signals of different frequencies corresponding to the signal signals are emitted by the test transmitter of the central alarm unit 1 and both frequency channels are checked for blocking.

If one of the frequency channels is blocked, i.e. If no acknowledgment is received on a frequency channel, an external signal fault is displayed with a reference to the disturbed frequency channel at the alarm center 1.

If no acknowledgment is received on both frequency channels, an alarm is given and a corresponding display is shown on the alarm center 1.

An external signal interference is thus not only detected, but also evaluated with regard to its effect on the transmission channel.

Since repeated activation of the contact sensors 20, for example by opening a door or a window, is extremely unlikely, it is not necessary to provide a sleeping time. Depending on the application, a sleep time of, for example, 3 minutes can also be programmable.

Furthermore, the contact detectors 20 can be programmed in such a way that opening and closing signals or only opening signals are emitted. The contact detectors 20 can also have a wired input for a glass break sensor and an integrated evaluation circuit for evaluating the signals emitted by the glass break sensor, so that an additional Message signal can be given in the event of glass breakage

The smoke detector 22 is also deactivated for 3 minutes (sleep time) after an alarm signal has been given. This prevents the smoke detector 22 from immediately re-alarming in an alarm state since there is still smoke in its measuring chamber. Such an ongoing alarm signal could lead to interference with other alarm signals.

To control the signaling devices 70 and 71, a universal receiver 710 can be provided, which can be programmed either as an alarm interface or as a communication interface. The universal receiver can have a metal housing with externally arranged antennas and 10 outputs such as relay outputs, the states of the relay outputs being able to be indicated by means of light indicators arranged on the housing such as LEDs.

The metal housing causes a reduction in the coupled electromagnetic interference and thus an improved reception behavior.

An additional second receiver can be plugged into the main receiver for dual-frequency operation. Furthermore, a transmitter can be provided for delivering a sabotage signal to the alarm center 1 when an external intervention message is received via a wire-bound sabotage input, for example.

If the universal receiver 710 is operated as an alarm interface, it directly generates control signals for the signaling devices 70, 71 via its relay outputs.

• optische Alarmierung
• akustische Alarmierung
• Brandalarmierung
• Aktivierung der Gefahren-Meldeanlage (Scharfanzeige)
• Fremdsignal erfaßt.

The following control signals can be used:

• visual alarm
• acoustic alarm
• Fire alarm
• Activation of the hazard alarm system (arming display)
• External signal detected.

- Alarm

- Technischer Alarm

- Aktivierung

- Batteriestörung

- Brand

- Netzstörung

- Sabotage

- Melderüberwachungsstörung

- Überfall

- Fremdsignalstörung

If the universal receiver is programmed as a communication interface, the relay outputs are used to display the received signal type and are connected to the signaling device 70, 71, which generates the alarm control signals itself. The relay outputs can have the following meanings, for example:

- alarm

- Technical alarm

- activation

- battery failure

- fire

- grid failure

- sabotage

- Detector monitoring fault

- raid

- External signal interference

The receiving part 10 of the control center 1 is described in more detail below with reference to FIG. 2. 2 shows a perspective and a partially opened side view of the receiving part 10.

The receiving part 10 can be surrounded by a metal housing that can be opened with a separate front part 12 and rear part 13. The metal housing protects the receiver circuit from electromagnetic interference. A main board 14 is attached to the inside of the back part 13 and a display board 15 to the inside of the front part 15 of the housing. Display elements such as light emitting diodes (LEDs, 19) of the display panel 100 are arranged on the display board 15. The display board 15 is connected via a pluggable line connection, e.g. a flat cable 16 connected to the main board 14 with a plug device.

The voltage supply is arranged separately and has a transformer 17 and an accumulator 18, the voltage supply also being connected to the main board 14 via a pluggable line system.

The main receiver with an integrated signal coding circuit can, for example, be plugged onto the main board 14 be, an additional second receiver can also be arranged pluggable on the main board 14 for dual-frequency operation.

In the second receiver, there is no need for a further signal coding circuit, since the signal coding can already be carried out in the signal coding circuit of the main receiver or the main board 14.

According to the frequency values mentioned above, the 40 MHz and 152/173 MHz receivers can be quartz-controlled and the 418/433 MHz receiver can be controlled by means of a sawtooth generator or also by means of a crystal.

The receivers work on the superposition principle (super heterodyne receiver) with a narrow intermediate frequency bandwidth and thus high selectivity.

The number of possible system codes is preferably greater than 5000 and the number of available channels is preferably greater than 200. The system coding enables the radio signals to be differentiated with regard to the system (system code), the message groups and the message signal types

The 40 MHz receiver can be powered by either a ferrite rod antenna or a flexible wire antenna 90. The 152/179 MHz receiver can be fed by a stub antenna with coaxial connection and the 418/433 MHz receiver by a solid wire antenna 91.

The receiving part 10 of the signaling center 1 can also have two field strength measuring devices 25, by means of which the receiving level can be determined when testing the hazard alarm system.

The transmitting part 11 of the signaling center 1 can be accommodated in its own housing which is protected against external interference and has a universal transmitter which is connected to the main circuit board of the receiving part 10 via a plug-in line connection, for example a flat cable. The universal transmitter controls the remote optical and acoustic signaling devices 70, 71 or other remote transmitter devices.

For this purpose, the universal transmitter sends out output signals in accordance with the programming of the main board 14 of the receiving part 10, which can likewise be formed from two radio signals of the corresponding frequency. Thus, two plug-in receivers for the two frequency channels can also be present in the transmitting part 11. The output signals are delayed, for example, by 10 seconds in order to prevent the risk of a signal collision with incoming signal signals from the signaling devices.

The external intervention (sabotage) signaling can take place, for example, via a wire connection to one of the wired inputs of the receiving part 10. Likewise, the power supply to the transmitting part 11 is wired via the receiving part 10 of the control center 1.

The signaling center 1 has wired inputs terminated via a terminating resistor, e.g. a zone entrance, a sabotage entrance and a robbery entrance.

There is also a wired lock input for entering the closed state of the outer doors and a wired communication error input (AWUG) for reporting a communication fault with a central point such as an emergency call center.

Furthermore, a reset input can be provided for externally resetting, for example, technical alarms, stored detector monitoring, external signal and broken glass displays.

The signaling center 1 can evaluate radio signals from, for example, 8 or 16 wireless signaling groups with correspondingly assigned signaling devices.

The receiving part 10 of the signaling center 1 has, for example, 4 relay outputs, 10 communication outputs and 3 outputs for illuminated display elements (LEDs) 19.

Furthermore, there can be two individually protected voltage supply outputs for supplying external devices. Individual protection is of particular importance, since the triggering of a short circuit when a cable is cut does not put the entire hazard alarm system out of operation.

• Steuerung der optischen Signalisierung
• Steuerung der akustischen Signalisierung
• Steuerung eines internen Signalisierausgangs
• Steuerung eines internen Signalgebers.

The relay outputs are used to control the transmitting part 11 via the line connection, and the following functions can be assigned to them, for example:

• Control of optical signaling
• Control of acoustic signaling
• Control of an internal signaling output
• Control of an internal signal generator.

• Alarm oder Überfall
• Störanzeige (Fremdstörung, Netzstörung, Sabotagestörung, Batteriestörung)
• Aktivierung der Anlage

The outputs for the light indicators can have the following meanings:

• Alarm or robbery
• Fault display (external fault, mains fault, sabotage fault, battery fault)
• Activation of the system

The 10 communication outputs can, for example, be switched to a high potential when they are activated and can be used to display certain system states by actuating further illuminated display elements 19.

The illuminated display elements 19 are located on the display field 100 of the receiving part 10.

3 shows the display field 100 of the receiving part 10 of the signaling center 1.

Two- or three-color light-emitting diodes (LEDs) can be used as light-emitting elements.

Each of the 16 message groups present in this exemplary embodiment is assigned a light-emitting diode 19 for displaying a message. Using buttons 26, zones 1 to 6 can be deactivated individually.

The field strength measuring devices 25 are also displayed via light-emitting diodes 251, and a separate display can be provided for each of the two frequency channels. In addition, an external signal interference can be indicated as the cause of the reception by means of a light display assigned to the field strength measuring devices 25.

When the hazard alarm system is activated externally, all light indicator elements are switched off.

Due to the complex structure of the alarm center 1, an extremely logical and easy-to-understand programming process for the hazard alarm system is required.

This is achieved by using switch arrangements (jumpers) arranged in the control center 1, each of the switches having three switch positions. In addition, a DIP switch (Dual In Line Package) can be provided to define the zones for detector monitoring.

This enables a simple, step-by-step sequence of programming on the basis of yes / no decisions, it being possible to dispense with a microprocessor control. The system installer follows simple programming instructions such as "Do you want this function or not" questions and does not need a complicated input keyboard or difficult to understand and error-prone programming codes.

- Meldegruppen 1 bis 16:

Teil- oder Vollaktivierung

- Relaisausgänge 1 bis 3:

Dauerbetrieb oder nur bei aktivierter Meldeanlage

- Aktivierung:

drahtgebundene Aktivierung vorrangig oder nicht

- einmaliger Alarm

Alarmierung durch die gleiche Meldegruppe bei autom. Wiederscharfschaltg. möglich oder nicht

- Melderüberwachung:

Überwachung Ja oder Nein
ein- oder zweifrequent
Signalisierungsart bei ein- bzw. zweifrequentem Betrieb

- Fremdsignalstörung:

Signalisierungsart bei ein- bzw. zweifrequentem Betrieb

Possible programming functions of the hazard alarm system are given below:

- zones 1 to 16:

Partial or full activation

- relay outputs 1 to 3:

Continuous operation or only when the alarm system is activated

- activation:

wired activation priority or not

- one-off alarm

Alerting by the same zone with autom. Re-arming possible or not

- Detector monitoring:

Monitoring yes or no
single or double frequency
Type of signaling with single or double frequency operation

- External signal interference:

Type of signaling with single or double frequency operation

The following types of signaling can be programmed, for example:

In the case of detector monitoring, either internal alarming when the hazard alarm system is deactivated and full alarming when the system is activated, or internal alarming when the system is deactivated and activation of a relay output and the internal encoder when the system is activated.

In the case of external signal interference and single-frequency operation, either activation of the corresponding communication output after a 30s fault duration or complete alarm.

In the case of external signal interference and dual-frequency operation in the event of a disturbance on both frequency channels, an immediate complete alarm when the system is activated or a delayed one complete alarm after 30s of fault duration or an immediate "silent" alarm.

4A shows a front view of the motion detector 21, which has three different detection zones 30 and a focusing device, such as a flat lens 31, which can contain both horizontal and vertical masking zones or a standard 12x12 masking pattern.

4B shows the motion detector 21 with the front plate 32 and sensor unit removed, and a side view of the circuit board arrangement located inside.

A transmitter board 35 with transmitter circuit is pluggable on the main board 37, the main board being in turn pluggable on a support plate 34 that can be fixed to the housing of the motion detector 21. The additional transmitter board 36 with a second transmitter circuit required for the dual-frequency operation can also be plugged onto the main board 37 next to the transmitter board 35.

Alternatively, the additional transmitter board 36 can be plugged onto the transmitter board 35.

Of course, a non-detachable connection between the transmitter boards 35, 36 and the main board 37 is also conceivable.

A ferrite rod antenna 38, which is arranged on the front side of the carrier plate 34, can be present as the transmitting antenna for the 40 MHz frequency range, the main and transmitter boards being located on the rear side of the carrier plate 34.

In addition, for the higher frequency channel, a further transmission antenna is, for example, integrated on the main board 37 or the corresponding transmitter board 35, 36.

If the 40 MHz frequency range is not used, then both transmitter antennas can also be arranged integrated on the corresponding transmitter boards 35, 36, the ferrite rod antenna being omitted.

According to FIG. 4C, a battery compartment with a battery 40 or an accumulator is located between a housing rear wall 39 and the circuit board arrangement.

A battery discharge warning signal is emitted either when motion is detected or during automatic detector monitoring by the transmitter or transmitters.

The structure described above enables a compact design of the motion detector 21.

In summary, a wireless hazard warning system is disclosed with a reporting center and at least one reporting device, the reporting center receiving and evaluating a radio message issued by the reporting device in the event of a reporting event. In order to reduce the susceptibility of the alarm system to external signals from external interference transmitters, the radio message consists of two radio signals of different frequencies, which means that the probability of interference can be drastically reduced. In addition, the control signal emitted from the signaling center to a signaling device can also be dual-frequency, which also enables radio-controlled signaling that is not susceptible to interference. A further possibility for increasing security against external signal interference is the provision of signaling devices in which the duration of a deactivation phase and the number of renewed signaling signals can be programmed until the deactivation phase is initiated. In addition, an external signal interference with regard to the blocking of the system can be evaluated by means of an external signal checking system consisting of test transmitter and receiver, even before an alarm is triggered, and thus the interference immunity can be further increased.

Wireless hazard warning system with a reporting center and at least one reporting device, the reporting center receiving and evaluating a radio message issued by the reporting device in the event of a reporting event. In order to reduce the susceptibility of the alarm system to interference with external signal effects from external interference transmitters, the radio message consists of two radio signals of different frequencies, which means that the probability of interference can be drastically reduced. In addition, the control signal emitted from the signaling center to a signaling device can also be dual-frequency, which also enables radio-controlled signaling that is not susceptible to interference. A further possibility for increasing the security against external signal interference is the provision of signaling devices in which the duration of a deactivation phase and the number of signaling signals can be programmed before the deactivation phase is initiated. In addition, an external signal interference with regard to the blocking of the system can be evaluated by means of an external signal checking system consisting of test transmitter and receiver, even before an alarm is triggered, and thus the interference immunity can be further increased.

Claims (30)

Signaling device for a wireless danger signaling system, the wireless danger signaling system having a signaling center (1) which receives and evaluates a radio message issued by the signaling device in the event of a signaling event,
characterized in that
the signaling device generates at least two radio signals of different frequencies and emits them as radio messages. Notification device according to claim 1,
characterized in that
each of the radio signals may include an alarm signal, a tamper warning signal and a battery discharge warning signal. Notification device according to one of claims 1 or 2,
characterized in that
there is a separate transmitter (35, 36) for each of the radio signals. Notification device according to claim 3,
characterized in that
the transmitting devices (35, 36) are arranged so that they can be plugged into the reporting device ( 1) . Notification device according to claim 4,
characterized in that
one (36) of the transmission devices is pluggable on the other (35) . Notification device according to one of claims 3 to 5,
marked by
at least one antenna device (38) , which is arranged on one side of a carrier plate (34) , the transmitter devices (35, 36) being arranged on the other side. Signaling device for a wireless danger signaling system, the wireless danger signaling system having a signaling center (1) which receives and evaluates a radio message issued by the signaling device in the event of a signaling event,
marked by
a setting device by means of which a number of radio messages which can be reissued can be set until the occurrence of a deactivation period and / or the duration of the deactivation period. Alarm center for a wireless hazard alarm system, the wireless hazard alarm system having at least one alarm device and the alarm center (1) receiving and evaluating a radio message issued by the alarm device in the event of an alarm event,
characterized in that
that the signaling center (1) receives and evaluates at least two radio signals of different frequencies as radio messages. Reporting center according to claim 8,
marked by
a transmission device (11) which, depending on the evaluation result of the received radio signals, transmits at least two radio signals of different frequencies to a signaling device ( 70, 71) . Reporting center according to claim 9,
characterized in that
the frequencies of the radio signals emitted by the signaling center (1) are equal to the frequencies of the radio signals emitted by the signaling devices. Reporting center according to claim 9,
characterized in that
the frequencies of the radio signals emitted by the signaling center (1) are not equal to the frequencies of the radio signals emitted by the signaling devices. Reporting center according to one of claims 9 to 11,
characterized in that
the transmission device (11) is arranged in a separate housing. Reporting center according to one of claims 9 to 12,
characterized in that
the transmission device (11) has a separate transmission circuit for each of the radio signals. Reporting center according to one of claims 9 to 13,
marked by
a receiving device (10) which has a metallic housing (12, 13) . Reporting center according to claim 14,
characterized in that
the receiving device (10) has a separate receiver circuit for each of the radio signals of the reporting devices, each with an associated external antenna device (90, 91) . Reporting center according to one of claims 9 to 15,
characterized in that
the message center (1) issues a message for a predetermined duration if an external signal disturbance persists. Reporting center according to one of Claims 9 to 16,
characterized in that
the signaling center (1) when detecting an external signal interference on the frequency channel of the one radio signal and at the same time Receiving an alarm message on the frequency channel of the other radio signal carries out an alarm. Reporting center according to one of Claims 9 to 16,
characterized in that
the signaling center (1) triggers a pre-alarm condition for a certain period of time during which the reception of a further radio signal leads to an alarm when a third-party signal interference is detected on the frequency channel of the one radio signal and at the same time an alarm message is received on the frequency channel of the other radio signal. Reporting center according to one of claims 9 to 18,
characterized in that
the signaling center (1) issues an alarm when both radio signals are received. Reporting center according to one of claims 9 to 19,
characterized in that
the alarm center (1) alarms when an external signal interference is detected on the frequency channels of both radio signals. Wireless hazard warning system with a reporting center (1) and at least one reporting device, the reporting center (1) receiving and evaluating a radio message issued by the reporting device in the event of a reporting event,
marked by
a test transmission device which emits a radio test signal of at least one frequency when the external signaling center (1) detects an external signal, thereby checking the availability of the transmission channel. Wireless hazard detection system according to claim 21,
marked by
a reception test device (24) for receiving the radio test signal and for emitting an acknowledgment signal to the signaling center (1) when the radio test signal is received sufficiently. Wireless hazard detection system according to claim 22,
characterized in that
the reception test device has a transponder (24) which in turn emits at least one radio test signal of at least one frequency to the signaling center (1) . Wireless hazard warning system with at least one reporting device according to one of claims 1 to 7 and a reporting center (1) according to one of claims 8 to 20. Wireless hazard detection system according to claim 24,
marked by
a programming device by means of which a single-frequency operation with only one radio signal or a two-frequency operation with two radio signals can be selected. Wireless hazard detection system according to claim 25,
characterized in that
the programming device is programmable in a mechanical manner by means of a switch or plug arrangement. Wireless hazard detection system according to claim 25 or 26,
characterized in that
Different signaling types of the signaling center (1) can be programmed for the single and double frequency operating mode. Wireless hazard detection system according to one of claims 24 to 27,
characterized in that
the signaling devices transmit a readiness message consisting of at least two radio signals of different frequencies to carry out a signaling device monitoring to the signaling center (1) at predetermined time intervals. Wireless hazard detection system according to claim 28,
characterized in that
the signaling center (1) carries out signaling in the event of at least one missing message from a signaling device. Method for wireless hazard reporting, a radio message being transmitted and then evaluated when a reporting-relevant event occurs,
characterized by the steps:
Generating at least two radio signals of different frequencies as radio messages,
Transmission of both radio signals when the alarm-relevant event occurs, and
Evaluation of both radio signals with regard to a signaling requirement.

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