EP0021232A1 - Device for a burglary alarm system - Google Patents

Abstract

1. Means for giving an alarm in the case of unauthorized entry into a protected area, particularly an alarm system for protecting buildings against burglary, in which there is a control station (10), to which are connected peripheral devices (20, 30, 40, 50, 60), whereof some are optionally installed in neighbourhood areas, in the form of alarm sensors, controls, alerting devices, etc, by means of an existing power supply mains (90), in which an identically constructed control device (80) is provided in the control station (10) and also in the peripheral devices (20, 30, 40, 50, 60), said control device being clearly individualized by an identification code within the means, in which each control device (80) has a transmitter and a receiver for control signals interchangeable between control devices, a logic circuit, a signal store and a programme store, in which a predetermined change of state in the vicinity of a peripheral device (20, 30, 40, 50, 60) is recognized by the logic circuit of its control device (80) and is indicated by its transmitter to all the other control devices and is recorded there, in which certain selected changes of state can be supplied to an alerting device (11, 21, 41) for giving an alarm and in which all the control devices (20, 30, 40, 50, 60) within a means are identified by a uniform group code, characterized in that each control device (80) is constructed as a microprocessor having a storage capacity such that the changes of state of all the peripheral devices (20, 30, 40, 50, 60) leading to an alarm being given, and also the changes of state from neighbourhood areas are stored with an external group code, so that a group code emitted by an external means not belonging to one's own means and arranged in the reception area of the receiver of a control device (80) is received, decoded and evaluated by all the control devices (80) within one's own means, and that the transmission of a control signal is suppressed until the transmission of another control signal already started at the start of a transmission process in the reception area is at an end, it also being possible for said signal to come from an external means.

Description

The invention relates to an arrangement for alarming in the event of unauthorized entry into a protected area, in particular alarm system for protecting buildings against burglary, in which a control center is present, to which peripheral devices in the form of alarm sensors, operating devices, alarm transmitters or the like, using the existing power supply network are connected as a signal transmission path.

The invention has for its object to provide an arrangement for alarming in the event of unauthorized entry into a protected area of the type mentioned above, which ensures excellent adaptability to individual requirements and at the same time a particularly high level of operating comfort and security through extremely flexible training.

The invention provides for achieving this object. da3 a control device is arranged in the control center and in the peripheral devices, which is clearly individualized by an identification code within the arrangement, that each control device has a transmitter and a receiver for control signals interchangeable between all control devices, a program-controlled logic circuit, a signal memory and has a program memory that a predetermined change in state in the area of a peripheral device is recognized by the logic circuit of its control device and is reported by its transmitter to all other control devices and registered there, and that certain selected changes in state can be fed to an alarm transmitter to trigger an alarm.

According to a particularly preferred embodiment of the subject matter of the invention, it is envisaged that each tax direction is designed as a microprocessor. The interaction of the microprocessors in the peripheral devices with one another, as well as the interaction of the microprocessors in the peripheral devices with the microprocessor in the control center, results in extraordinarily diverse advantageous properties in terms of operating and monitoring convenience, function control, fault identification, sabotage monitoring, operational safety and mobility of a control unit.

It can preferably be provided that the control devices in the peripheral devices and in the control center have an identical structure and that the control device in the control center differs from the control devices of the peripheral devices only by a revocable change in its stored function program. This achieves the advantage that the microprocessors used are completely identical in terms of device technology and are automatically assigned their intended purpose when inserted in a peripheral device or in the control center. It is preferably provided that the revocable change in the function program when the control device is inserted into the control center or one of the peripheral devices can be carried out by applying a predeterminable voltage level to one of the connection contacts. A microprocessor is programmed in this way, for example, by a certain voltage level in such a way that it takes over the functions of the control center, while programming by another voltage level is carried out in such a way that the corresponding microprocessor takes over the functions of a peripheral device.

According to an advantageous development of the subject matter of the invention, it is provided that all control devices within an arrangement are identified by a group code. This can ensure that the microprocessors within a certain system only accept signals that are sent by microprocessors with the same group coding.

Advantageously, however, it can also be provided that an external group code, which is sent by a comparable external arrangement that may be located in the reception area of the receiver of a control device and does not belong to its own arrangement, is also received by all control devices within its own arrangement. is decoded and evaluated. A group code received from an external arrangement is preferably also stored in each microprocessor. Furthermore, it is preferably provided that the transmission of a control signal is suppressed if another control signal whose transmission has started earlier is already being transmitted in the reception area at the beginning of the transmission process, the transmission preferably being suppressed by a predetermined time period and after a predetermined number of Suppressions an alarm can be triggered.

In this way, the advantage can be achieved that different alarm systems can be installed in different neighboring apartments or houses within a certain reception area without fear of mutual interference or interference. In such an installation, the devices of a specific system recognize and also register that a similar system with a different group code is installed in the neighboring area. However, it also ensures that only signals with the group code intended for this system are evaluated within a specific system. Furthermore, this ensures that the transmission of a specific signal can be briefly suppressed or delayed, but this is in no way disadvantageous, since the delay time for a possibly required alarm is absolutely negligible. In this way, the additional advantage is achieved that in the event of a possible failure attempt by feeding in coded signals, an alarm is given in any case, since after a predeterminable number of suppressions or delays, an alarm signal is definitely issued.

The security of the system is also controlled in that the selected changes in state for alarming are preferably stored in each microprocessor and that an alarm can be triggered by any peripheral unit equipped with a microprocessor.

A further advantageous development of the subject invention is characterized in that at least one of the peripheral units is designed as a remote switching device which mpfangsbereich the arrangement is connectable to any point in the _E at a distance from the control center to the mains supply network and da3 to the remote switching unit all operating and display elements are available which are necessary for the operation and for monitoring the entire arrangement for alarming. The mobility of the control unit achieved thereby enables the highest possible comfort for the operation and monitoring of an alarm system. The control unit, which is preferably designed as a remote switching device, can function properly as well as any faults be clearly displayed.

Another preferred embodiment of the subject matter of the invention is characterized in that a neighborhood call device can be connected to the control center as a peripheral device, which has at least one alarm detector and display elements that provide sufficient information about the operating state of the alarm system. In principle, several neighborhood call devices can also be connected. It is thus possible to take precautions at several points outside of a protected area without any installation effort, so that the status of a particular alarm system can be monitored and an alarm which may have been triggered can be detected.

An additional security arises from the fact that when the alarm system is armed, the status of each peripheral device is queried by the control center and confirmed by the peripheral device by a corresponding feedback. For example, if a certain peripheral device is not connected, the circuit can be provided in such a way that the alarm system cannot be activated. Should one of the peripheral devices be put out of operation after the alarm system has been armed, this would mean a change of state already mentioned above, which would immediately trigger an alarm.

It is preferably provided that a change in state in the area of a certain peripheral device is transmitted to all other control devices immediately after it occurs, regardless of an interrogation signal from the control center. Basically, it is possible that an alarm will also be issued by one of the peripheral devices is triggered when the control device in the control center should not be functional.

• Fig. 1 in einer schematischen Darstellung ein Blockschaltbild der erfindungsgemäßen Anordnung und
• Fig. 2 ein Blockschaltbild, welches den Netzanschluß für die verschiedenen Teile einer Alarmanlage veranschaulicht.

The invention is described below, for example, with reference to the drawing, in which:

• Fig. 1 is a schematic representation of a block diagram of the arrangement according to the invention and
• Fig. 2 is a block diagram which illustrates the network connection for the various parts of an alarm system.

According to FIG. 1, there is a control center 10 to which an optical alarm transmitter 12 and large sirens 11a and 11b are connected directly. Furthermore, a telephone dialer (TWG) 13 is connected directly to the control center 10.

These alarm transmitters, which are directly connected to the control center, can be monitored against sabotage, so that an alarm is always triggered when the attempt is made. disrupt, damage or shut down one or more of these alarms. Under certain circumstances, it is also possible to connect a plurality of similar alarm transmitters to the control center 10, as is indicated for the large sirens 11a and 11b, for example.

The peripheral devices designated 20, 30, 40, 50 and 60 are operationally connected to the central office. However, there is no direct wiring and therefore no installation between the control center and the peripheral equipment is required. Rather, each peripheral device, like the control center 10, is connected to a power supply network, as is shown in FIG gur 2 can be seen. The dash-dotted lines between the control center and the peripheral devices are intended to indicate that there is an operational connection between these components, ie. there is a signal connection, but no direct line connection in the form of a line specially laid for the alarm system. Since all peripheral devices as well as the control center are connected to a power supply network, there is of course also a signal connection between the individual peripheral devices.

A motion detector 30 can be, for example, an infrared motion detector or another corresponding device. A control lamp 31 for the mains voltage and a control lamp 32 for an alarm or a fault are arranged on the motion detector 30. For example, opening contacts can also be connected to the motion detector 30 or to its control part. A contact 33 is shown in FIG. 1, for example, which is arranged in a loop, which is connected to the control part of the motion detector 30.

A neighborhood call device 40 can also be connected to the power supply network at any point within or outside the protected area. As shown in FIG. 1, this device has a control lamp 42 for the mains voltage, a further control lamp 43 for arming and finally a control lamp 44 for disarming. A small siren 41 is also connected to the neighborhood call device 40. If an alarm is triggered, the alarm status is indicated acoustically by the small siren 41. Of course, optical alarm devices or additional control lamps can also be provided on the neighborhood call device 40 in order to also visually indicate an alarm.

Furthermore, an alarm sensor connection device 50 can be connected to the network, which serves to connect a loop with contacts such as 53a, 53b and 53c. The alarm sensor connection device 50 has a control lamp 51 for the mains voltage and a control lamp 52 for an alarm or a fault. If the system is armed, an alarm is triggered as soon as one of the contacts 53a, 53b or 53 should be opened.

Finally, a remote switching device 20 is provided, which is the actual operating element for the alarm system shown in FIG. 1. The remote switching device 20 has a key switch 22, on which the system can be switched on and off. In the present description, instead of the term “switching on”, the term “armed” is also used. A system that is switched on is accordingly "armed" and a system that is switched off is "armed".

Furthermore, the remote switching device 20 has a display device 23, in which, for example, the number "15" is shown in FIG. 1. The display device 23 can be used, for example, to display the peripheral device in the area in the area of which an alarm has been triggered after an alarm has been triggered A switching element (not shown) can also be provided, which switches the display device 23 in such a way that in the switched state a possibly defective battery is displayed, which is preferably present in the peripheral devices as well as in the control center as an emergency power supply.

Furthermore, on the remote switching device 20 there is a control lamp 24 for an alarm or a fault, a further control lamp 25 for the mains voltage, and an additional control lamp 26 for arming and finally a control lamp 27 for disarming.

A small siren 21 is connected directly to the remote switching device 20 and triggers a signal in the event of an alarm.

Furthermore, an internal siren 60 is provided, which is designed as a peripheral device and can be connected to the network at any point. The system is designed in such a way that either an internal alarm is given or an external alarm is triggered. In the case of an internal alarm, for example, only the internal siren 60 and / or one of the small sirens 21 or 41 is sounded. In the event of an external alarm, the optical alarm device 12 responds as well as the two large sirens 11a and 11b, and the alarm continues to be reported via the telephone dialer 13. Both an internal alarm and an external alarm are preferably displayed on the neighborhood call device 40 in a suitable manner.

Each peripheral device as well as the control center are individualized by a special device code, i. H. clearly marked. Furthermore, all devices within a certain system are identified by a uniform group code. The coding can expediently be carried out by soldering diodes into a matrix.

Normally, within an arrangement or an alarm system, the signals transmitted in a special function code are only evaluated by the devices with the same group code. As explained above, However, signals can also be received and registered from a neighboring arrangement arranged in the reception area. This means that if several systems of the same type are installed within a certain reception area, interference can be avoided, since transmission of a signal can be suppressed according to the above explanations if another device is already in use at the start of the transmission process should have started to emit a signal. After a certain delay time has been devalued, the device in question then tries to send a signal again. It is preferably provided that an alarm is triggered after a predetermined number of unsuccessful attempts.

When the system is switched on or armed, for example using the key switch 22 on the remote switching device 20, the control center 10 queries each peripheral device. Since the control center knows what number of peripheral devices must be available, the system cannot be sharpened if not all peripheral devices respond correctly. In this way it is ensured that the system is completely connected and in an orderly state if no fault is reported after the key switch 22 has been actuated.

Any change in the status of one of the peripheral devices leads to an alarm. Furthermore, an alarm is also triggered if, for example, a request from the control center 10 to one of the peripheral devices remains without a clear response signal. A state change occurs, for example, when the motion detector 30 detects movement in its monitored area, if one the contacts 33, 53a, 53b or 53c should be opened, or even if, for example, one of the peripheral devices should be disturbed, damaged or disconnected from the mains.

In order to increase the reliability of the system, it can also be provided that the entire system is reset to the basic state by an operating element (not shown). For example, all memories that are assigned to the control devices or microprocessors are deleted. Such a return to the so-called basic state may be expedient under certain circumstances if the program running in one of the microprocessors should have caught itself in a so-called dead loop. It can also be provided under other predetermined conditions to bring the system into its basic state.

It can be seen from FIG. 2 that the control part 80 of a peripheral device or the control center is terminated on the power line 90 via a power adapter 70. For illustration, only part of the devices present in a practical embodiment is shown in the control part 80. Accordingly, in the illustration in FIG. 2, the control part 80 contains a microprocessor 81, to which a display part 82, an operating part 83 and an alarm part 84 are connected.

The Netzsnpaßgerät essentially serves to ensure the proper signal transmission between the control part 80 and the power line 90.

As shown in FIG. 2, the signals are discharged from the power line 90 via a transformer 71 and also fed back into the network via the transformer 71. A filter 72 is connected to the transformer 71 sen, in which the frequency range provided for signal transmission is filtered out. A signal fed in by the mains line 90 via the transmitter 71 and the filter 72 is passed on to the control part 80 via an input amplifier 73, a demodulator 74 and a disturbance pulse trap 75. If a signal is emitted by the control part 80, this signal arrives via a Modulator 76 and an output amplifier 77 to the transmitter 71, via which the signal is coupled into the power line 90.

Since the internal network adapter 70 and also the components contained in the control part 80 can be of a known, conventional type, the circuit used for signal transmission does not require a more detailed description here.

A coded signal transmission is preferably provided in order to increase operational reliability.

The signal transmission preferably takes place in a frequency range of a few kilohertz, and frequencies of the order of magnitude of 280 kilohertz can be used, for example, for signal transmission.

In practice, signal transmission using frequency shift modulation has proven itself well.

Since all peripheral devices as well as the control center receive, decode and register each signal with each signal transmission, not only is an extremely flexible and powerful dialogue possible between the different parts of the alarm system, information can also be exchanged and for at any time about the status or changes in status the operation, the operation, the "monitoring and a possible alarm be made usable. In conjunction with the mobility of the control unit on the remote switching device 20, this results in a clear functional check, and it is possible to ensure a particularly high level of safety with an extremely good ease of use.

Claims (22)

1. Arrangement for alarming in the event of unauthorized entry into a protected area, in particular alarm system for protecting buildings against intrusion, in which a control center is present, to which peripheral devices in the form of alarm sensors, operating devices, alarm transmitters or the like are connected, characterized that in the control center (10) and in the peripheral devices (20, 30, 40, 50, 60) a control device is arranged, which is clearly individualized by an identification code within the arrangement, that each control device has a transmitter and a Receiver for interchangeable control signals between all control devices, a program-controlled logic circuit, a signal memory and a program memory, that a predetermined change in state in the area of a peripheral device is recognized by the logic circuit of its control device and by its transmitter to all other control devices htungen reported and registered there, and that certain selected changes in state an alarm transmitter (11, 12, 13, 21, 41, 60) can be fed to trigger an alarm. 2. Arrangement according to claim 1, characterized in that the control devices in the peripheral devices (20, 30, 40, 50, 60) and in the control center (10) have an identical structure and that the control device in the control center (10) only distinguishable from the control devices of the peripheral devices by a revocable change to their stored function program. 3. Arrangement according to claim 2, characterized in that the revocable change in the function program when inserting the control device in the control center (10) or one of the peripheral devices (20, 30, 40, 50, 60) can be carried out by applying a predefinable voltage level to one of the connection contacts. 4. Arrangement according to one of claims 1 to 3, characterized in that the identification code in each control device is fixed by diodes in a diode matrix. 5. Arrangement according to one of the preceding claims, characterized in that all control devices within an arrangement are identified by a group code. 6. Arrangement according to claim 5, characterized in that an external group code, which is transmitted by a comparable external arrangement which may be arranged in the reception area of the receiver of the control device and does not belong to the own arrangement, is received by all control devices within the own arrangement, is decoded and evaluated. 7. Arrangement according to claim 6, characterized in that a group code received from an external arrangement is stored. 8. Arrangement according to one of claims 6 or 7, characterized in that the transmission of a control signal is suppressed if another control signal is already being transmitted in the reception area at the beginning of the transmission process, the transmission of which started earlier. 9. Arrangement according to claim 8, characterized in that the transmission can be suppressed by a predetermined period of time. 10. Arrangement according to one of claims 8 or 9, characterized in that an alarm is triggered after a predetermined number of suppressions. 11. Arrangement according to one of the preceding claims, characterized in that the control device is designed as a microprocessor. 12. Arrangement according to one of the preceding claims, characterized in that the selected state changes leading to the alarm are stored in each microprocessor. 13. Arrangement according to one of the preceding claims, characterized in that an alarm can be triggered by any peripheral unit equipped with a microprocessor. 14. Arrangement according to one of the preceding claims, characterized in that at least one of the peripheral units is designed as a remote switching device (20) which can be connected to the power supply network at any point in the reception area of the arrangement at a distance from the control center and that on the remote switching device (20) all operating and display elements are available which are necessary for the operation and for monitoring the entire arrangement for alarming. 15. The arrangement according to claim 14, characterized in that on the control center (10) and / orcbm remote switching device (20) there is a display device which, in the event of an alarm, identifies the alarm sensor (50) by which the alarm was triggered. 16. Arrangement according to one of the preceding claims, characterized in that a neighborhood call device (40) can be connected to the control center (10) as a peripheral device, which has at least one alarm detector and display elements which provide sufficient information about the operating state of the alarm system. 17. Arrangement according to one of the preceding claims, characterized in that when the alarm system is activated by the control center (10), the status of each peripheral device is queried and confirmed by a corresponding feedback from the peripheral device. 18. Arrangement according to one of the preceding claims, characterized in that a change in state in the area of a certain peripheral device is transmitted immediately after it occurs regardless of a query signal from the control center to all other control devices. 19. Arrangement according to one of the preceding claims, characterized in that an adjusting device is provided, by means of which an internal or an external alarm can be specified. 20. The arrangement according to claim 19, characterized in that the internal alarm is given by an internal siren (60). 21. Arrangement according to one of the preceding claims, characterized in that predetermined peripheral devices can be monitored in such a way that on a query sent by the control center for status query signal if the feedback is not correct an alarm signal if the feedback is not correct an alarm is triggered. 22. Arrangement according to one of the preceding claims, characterized in that the control center (10) has an output to which the mains voltage is applied when an alarm is given.

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