EP0004912A1 - Annunciator of danger - Google Patents
Annunciator of danger Download PDFInfo
- Publication number
- EP0004912A1 EP0004912A1 EP79101031A EP79101031A EP0004912A1 EP 0004912 A1 EP0004912 A1 EP 0004912A1 EP 79101031 A EP79101031 A EP 79101031A EP 79101031 A EP79101031 A EP 79101031A EP 0004912 A1 EP0004912 A1 EP 0004912A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- lines
- memory
- multiplex
- detector
- detection system
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000011664 signaling Effects 0.000 claims abstract description 8
- 238000001514 detection method Methods 0.000 claims abstract description 6
- 238000011156 evaluation Methods 0.000 claims description 11
- 238000010586 diagram Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
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Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B26/00—Alarm systems in which substations are interrogated in succession by a central station
- G08B26/006—Alarm systems in which substations are interrogated in succession by a central station with substations connected to an individual line, e.g. star configuration
Definitions
- the invention relates to a hazard alarm system with a plurality of detectors connected to a central unit via signaling lines, the status of the detectors in the central unit being able to be ascertained via test devices and displayed via an evaluation device.
- Such alarm systems are known, for example as public fire alarm systems.
- these systems are modular; usually several cables can be connected to the controller boards in the control center. This results in the need to assign the correct displays to the detectors that are actually switched on and to ensure that lines that are not connected do not cause a fault display.
- the object of the invention is to provide a hazard alarm system of the type mentioned in the introduction in which such routings are not required in the wiring.
- the system is designed to ensure constant monitoring of the detector configuration in a simple manner, and any changes in the assignment can be quickly and easily taken into account in the control center and in the evaluation.
- this object is achieved in that a read / write memory is provided in the control center, in which the assignment of each individual message line can be stored via an input device, and that a multiplex interrogation device is also provided with which the individual message lines and the memory locations assigned to the message lines in the read / write memory can be queried synchronously, and that the message signals queried by the message lines together with the queried memory signals are routed via a comparison device and can only be switched to the evaluation device when the associated memory location indicates occupancy.
- the read-write memory therefore contains the entire system configuration in accordance with the assignment of the individual Reporting lines.
- the individual storage locations are described using an input element, for example a keyboard.
- the comparison device ensures that incoming messages are compared with the stored elements, and that fault messages or alarm messages are only passed on if the line concerned is busy, that is, if the detector is entered as available in the memory location concerned.
- a microcomputer can preferably be used as the comparison device.
- the only figure shows a circuit diagram for a danger detection system with a central Z, from which individual detection lines L1 ... Ln lead to detectors M1 ... Mn.
- the signal lines each lead to a detector interface MA1 ... MAn, in which the condition of the line or the connected detectors is checked.
- a signal r for idle state, a for alarm state or s for fault message appears at one of the three outputs.
- the individual detector connections MA1 to MAn are queried cyclically via a multiplex interrogation device (represented as a rotary selector) MX1 and MX2, specifically the outputs a for the alarm signal and the interrogation input via the interrogation device MX1.
- MX2 the outputs s for fault signals.
- An interrogation device is generally not required for the idle signals r, since the idle state does not need to be specifically displayed. As soon as an alarm or fault signal appears on a detector connection, it is fed to the alarm evaluation AA or the fault evaluation AS via the comparison device VG.
- a read / write memory SP is also provided in the control center, in whose individual memory locations S p 1... S p n the assignment of each message line L1 to Ln is stored is. Via an input device, such as a keyboard T, is.
- an input device such as a keyboard T.
- a busy status is entered in each memory location if a detector is attached to the associated line. If detector M1 is therefore switched on, contact T1 is closed and a logical one appears at the output of memory location Sp1.
- the memory outputs are turned on by a multiplex poll Direction MX7 queried synchronously with the detector connections, the queried signal is also fed to the comparison device VG.
- the alarm signals a and the fault signals s are only passed on to the evaluation circuits via the comparison device if the memory location in question has been found to be occupied.
- the functions of the comparison device and the multiplex interrogation devices can of course be carried out by a microcomputer with appropriate programming and with an associated read / write memory.
- the alarm evaluation AA and the fault evaluation AS each contain a multiplex output device MX4 and MX5, via which an alarm signal a or a fault signal s of a specific signal line in the display device for switching on the associated LED AD1 ... ADn or SD1 ... SDn is used.
- a flip-flop AF1 ... AFn or SF1 ... SFn is assigned to each LED.
- the alarm signal is also fed to a bistable alarm switch BAS, which in the usual way gives an acoustic alarm or forwards the alarm message to a higher-level control center.
Abstract
Gefahrenmeldeanlage, beispielsweise Brandmeldeanlage, mit einer Mehrzahl von Meldern (M1 ... Mn), die über Meldeleitungen (L1 ... Ln) an eine Zentrale (Z) anschaltbar sind. In der Zentrale (Z) ist ein Schreib-Lese-Speicher (SP) vorgesehen, in welchem für jeden an die Meldeleitungen (L1 ... Ln) anschaltbaren Melder (M1 ... Mn) ein Speicherplatz (Sp1, Spn) vorgesehen ist, auf welchem die tatsächliche Belegung des betreffenden Melderplatzes gespeichert ist. Bei jeder Abfrage der Meldeleitungen (L1 ... Ln) werden die von bestimmten Melderplätzen kommenden Melde-signale (a, s) nur dann ausgewertet, wenn für die betreffenden Melderplätze eine Belegung gespeichert ist.Hazard detection system, for example fire alarm system, with a plurality of detectors (M1 ... Mn) that can be connected to a control center (Z) via signaling lines (L1 ... Ln). A central read / write memory (SP) is provided, in which a memory location (Sp1, Spn) is provided for each detector (M1 ... Mn) that can be connected to the message lines (L1 ... Ln) on which the actual occupancy of the relevant detector location is stored. Each time the signaling lines (L1 ... Ln) are queried, the signaling signals (a, s) coming from certain detector locations are only evaluated if an assignment has been saved for the relevant detector locations.
Description
Die Erfindung bezieht sich auf eine Gefahrenmeldeanlage mit einer Mehrzahl von über Meldeleitungen an eine Zentrale angeschalteten Meldern, wobei der Zustand der Melder in der Zentrale über Prüfeinrichtungen feststellbar und über eine Auswerteeinrichtung anzeigbar ist.The invention relates to a hazard alarm system with a plurality of detectors connected to a central unit via signaling lines, the status of the detectors in the central unit being able to be ascertained via test devices and displayed via an evaluation device.
Derartige Meldeanlagen sind bekannt, beispielsweise als öffentliche Feuermeldeanlagen. Im allgemeinen sind diese Anlagen modular aufgebaut; dabei sind an die Anschaltbaugruppen in der Zentrale meist mehrere Leitungen anschließbar. Daraus ergibt sich die Notwendigkeit, den tatsächlich angeschalteten Meldern die richtigen Anzeigen zuzuordnen und dafür zu sorgen, daß nicht beschaltete Leitungen keine Störungsanzeige bewirken.Such alarm systems are known, for example as public fire alarm systems. In general, these systems are modular; usually several cables can be connected to the controller boards in the control center. This results in the need to assign the correct displays to the detectors that are actually switched on and to ensure that lines that are not connected do not cause a fault display.
Dies geschieht in herkömmlichen Anlagen beispielsweise dadurch, daß an nicht beschalteten Leitungen eine funktionstüchtige Schnittstelle simmuliert wird, etwa durch ein besonderes Abschlußglied. Es ist aber auch möglich, die Weiterleitung des Alarms mittels spezieller Leitungen zu rangieren und erforderlichenfalls diese Weiterleitung durch Unterbrechen der Leitung zu verhindern. Bei herkömmlichen Anlagen muß in diesen Fällen jeweils ein Eingriff von Hand in die Verdrahtung der Anlage vorgenommen werden. Das erfordert einen erheblichen Zeitaufwand für die Schraub- und Lötverbindungen; außerdem besteht bei solchen Rangierarbeiten stets die Gefahr, daß Leitungen verwechselt und falsch verbunden werden.In conventional systems this is done, for example, by simulating a functional interface on lines that are not connected, for example by means of a special terminating element. However, it is also possible to forward the alarm using special lines to rank and, if necessary, prevent this forwarding by interrupting the line. In conventional systems, manual intervention in the wiring of the system must be carried out in these cases. This requires a considerable amount of time for the screw and solder connections; in addition, there is always the risk of cables being mixed up and incorrectly connected during such shunting work.
Aufgabe der Erfindung ist es, eine Gefahrenmeldeanlage der eingangs erwähnten Art zu schaffen, in welcher derartige Rangierungen in der Verdrahtung nicht erforderlich sind. Die Anlage soll auf einfache Weise eine ständige Überwachung der Melderkonfiguration gewährleisten, wobei jede Änderung in der Belegung schnell und einfach in der Zentrale und in der Auswertung berücksichtigt werden kann.The object of the invention is to provide a hazard alarm system of the type mentioned in the introduction in which such routings are not required in the wiring. The system is designed to ensure constant monitoring of the detector configuration in a simple manner, and any changes in the assignment can be quickly and easily taken into account in the control center and in the evaluation.
Erfindungsgemäß wird diese Aufgabe dadurch gelöst, daß in der Zentrale ein Schreib-Lese-Speicher vorgesehen ist, in welchem über eine Eingabevorrichtung die Belegung jeder einzelnen Meldeleitnng einspeicherbar ist, daß weiterhin eine Multiplex-Abfrage-Einrichtung vorgesehen ist, mit welcher die einzelnen Meldeleitungen und die den Meldeleitungen im Schreib-Lese-Speicher zugeordneten Speicherplätze synchron abfragbar sind, und daß die von den Meldeleitungen abgefragten Meldesignale zusammen mit den abgefragten Speichersignalen über eine Vergleichseinrichtung geführt sind und nur dann an die Auswerteeinrichtung weiterschaltbar sind, wenn der zugehörige Speicherplatz eine Belegung anzeigt.According to the invention, this object is achieved in that a read / write memory is provided in the control center, in which the assignment of each individual message line can be stored via an input device, and that a multiplex interrogation device is also provided with which the individual message lines and the memory locations assigned to the message lines in the read / write memory can be queried synchronously, and that the message signals queried by the message lines together with the queried memory signals are routed via a comparison device and can only be switched to the evaluation device when the associated memory location indicates occupancy.
Der Schreib-Lese-Speicher enthält also die gesamte Anlagenkonfiguration entsprechend der Belegung der einzelnen Meldeleitungen. Die einzelnen Speicherplätze werden über ein Eingabeelement, beispielsweise eine Tastatur, beschrieben. Durch die Vergleichseinrichtung wird sichergestellt, daß eingehende Meldungen mit den eingespeicherten Elementen verglichen werden, und daß Störungsmeldungen oder Alarmmeldungen nur dann weitergegeben werden, wenn die betreffende Leitung belegt, wenn also der Melder in den betreffenden Speicherplatz als vorhanden eingetragen ist. Als Vergleichseinrichtung kann vorzugsweise ein Mikrocomputer Verwendung finden.The read-write memory therefore contains the entire system configuration in accordance with the assignment of the individual Reporting lines. The individual storage locations are described using an input element, for example a keyboard. The comparison device ensures that incoming messages are compared with the stored elements, and that fault messages or alarm messages are only passed on if the line concerned is busy, that is, if the detector is entered as available in the memory location concerned. A microcomputer can preferably be used as the comparison device.
Die Erfindung wird nachfolgend an einem Ausführungsbeispiel anhand der Zeichnung näher erläutert.The invention is explained in more detail using an exemplary embodiment with reference to the drawing.
Die einzige Figur zeigt ein Schaltbild für eine Gefahrenmeldeanlage mit einer Zentrale Z, von der aus einzelne Meldelinien L1 ... Ln zu den Meldern M1 ... Mn fuhren. Die Meldeleitungen führen jeweils zu einer Melderanschaltung MA1 ... MAn, in welcher die Leitung bzw. die angeschlossenen Melder auf ihren Zustand überprüft werden. Je nach diesem Zustand erscheint an einem der drei Ausgänge ein Signal r für Ruhezustand, a für Alarmzustand oder s für Störungsmeldung.The only figure shows a circuit diagram for a danger detection system with a central Z, from which individual detection lines L1 ... Ln lead to detectors M1 ... Mn. The signal lines each lead to a detector interface MA1 ... MAn, in which the condition of the line or the connected detectors is checked. Depending on this state, a signal r for idle state, a for alarm state or s for fault message appears at one of the three outputs.
Nimmt man als Beispiel die Verwendung von Diodenmeldern an, wie bei M1 dargestellt, so ergeben sich diese Melde- signale in folgender Weise: Von der Melderanschaltung MA1 wird ein Wechselstrom oder ein Gleichstrom mit abwechselnder Polarität auf die Meldeleitung L1 gegeben. Solange der Alarm-knopf K im Ruhezustand ist, fließt die eine Halbwelle des Leitungsstroms über die Diode D1 und ergibt in der Melderanschaltung MA1 das Ruhesignal r. Wird der Alarmknopf K gedrückt, so fließt die andere Halbwelle des Leitungsstroms über die Diode D2 und ergibt in der Melderanschaltung MA1 das Alarmsignal a. Bei Leitungsunterbrechung kann überhaupt kein Strom über den Melder M1 fließen. Dies wird in der Melderanschaltung als Störungssignal s ausgewertet. Dieses Störungssignal wird auch erzeugt, wenn durch einen Leitungskurzschluß beide Halbwellen empfangen werden können. Ist kein Melder an die Leitung angeschlossen, so würde dies ebenfalls als Störungssignal gemeldet, wenn nicht in der Zentrale entsprechende Vorkehrungen getroffen würden.Assuming the use of diode detectors as an example, as shown for M1, these signal signals result in the following way: An alternating current or a direct current with alternating polarity is passed from the detector connection MA1 to the signal line L1. As long as the alarm button K is in the idle state, the one half-wave of the line current flows via the diode D1 and gives the idle signal r in the detector connection MA1. If the alarm button K is pressed, the other half-wave of the line current flows via the diode D2 and gives the alarm signal a in the detector interface MA1. If the line is interrupted, no current can flow through detector M1 at all. This is evaluated in the detector connection as a fault signal s. This interference signal is also generated if both half-waves can be received due to a line short circuit. If no detector is connected to the line, this would also be reported as a fault signal if appropriate measures were not taken at the control center.
In der Zentrale werden über eine Multiplex-Abfrageeinrichtung (dargestellt als Drehwähler) MX1 und MX2 die einzelnen Melderanschaltungen MA1 bis MAn zyklisch abgefragt, und zwar über die Abfrageeinrichtung MX1 die Ausgänge a für das Alarmsignal und über die Abfrageein- . richtung MX2 die Ausgänge s für Störungssignale. Für die Ruhesignale r ist eine Abfrageeinrichtung im allgemeinen nicht erforderlich, da der Ruhezustand nicht eigens angezeigt zu werden braucht. Sobald an einer Melderanschaltung ein Alarm- oder Störungssignal erscheint, wird es über die Vergleichseinrichtung VG der Alarmauswertung AA oder der Störungsauswertung AS zugeführt.In the control center, the individual detector connections MA1 to MAn are queried cyclically via a multiplex interrogation device (represented as a rotary selector) MX1 and MX2, specifically the outputs a for the alarm signal and the interrogation input via the interrogation device MX1. direction MX2 the outputs s for fault signals. An interrogation device is generally not required for the idle signals r, since the idle state does not need to be specifically displayed. As soon as an alarm or fault signal appears on a detector connection, it is fed to the alarm evaluation AA or the fault evaluation AS via the comparison device VG.
Um jedoch Meldungen nur dann auszuwerten, wenn die betreffende Leitung auch beschaltet ist, ist in der Zentrale weiterhin ein Schreib-Lese-Speicher SP vorgesehen, in dessen einzelnen Speicherplätzen Sp1 ... Spn die Belegung jeder Meldeleitung L1 bis Ln gespeichert ist. Über eine Eingabevorrichtung, etwa eine Tastatur T, wird . bei Inbetriebnahme der Anlage in jeden Speicherplatz ein Belegtzustand eingegeben, wenn an der zugehörigen Leitung ein Melder hängt. Ist also der Melder M1 angeschaltet, so wird der Kontakt T1 geschlossen, und am Ausgang des Speicherplatzes Sp1 erscheint eine logische Eins. Die Speicherausgänge werden durch eine Multiplex-Abfrageeinrichtung MX7 synchron mit den Melderanschaltungen abgefragt, das abgefragte Signal wird ebenfalls der Vergleichseinrichtung VG zugeführt. Über die Koinzidenzglieder AN1 und AN2 werden die Alarmsignale a und die Störungssignale s über die Vergleichseinrichtung nur dann an die Auswerteschaltungen weitergegeben, wenn der betreffende Speicherplatz als belegt festgestellt wurde. Die Funktionen der Vergleichseinrichtung und der Multiplex-Abfrage-Einrichtungen können natürlich von einem Mikrocomputer mit entsprechender Programmierung und mit einem zugeordneten Schreib-Lese-Speicher durchgeführt werden.However, in order to evaluate messages only when the line in question is also wired, a read / write memory SP is also provided in the control center, in whose individual memory locations S p 1... S p n the assignment of each message line L1 to Ln is stored is. Via an input device, such as a keyboard T, is. When the system is started up, a busy status is entered in each memory location if a detector is attached to the associated line. If detector M1 is therefore switched on, contact T1 is closed and a logical one appears at the output of memory location Sp1. The memory outputs are turned on by a multiplex poll Direction MX7 queried synchronously with the detector connections, the queried signal is also fed to the comparison device VG. Via the coincidence elements AN1 and AN2, the alarm signals a and the fault signals s are only passed on to the evaluation circuits via the comparison device if the memory location in question has been found to be occupied. The functions of the comparison device and the multiplex interrogation devices can of course be carried out by a microcomputer with appropriate programming and with an associated read / write memory.
Die Alarmauswertung AA und die Störungsauswertung AS enthalten jeweils eine Multiplex-Ausgabevorrichtung MX4 und MX5, über die ein Alarmsignal a oder ein Störungssignal s einer bestimmten Meldeleitung in der Anzeigeeinrichtung zur Einschaltung der jeweils zugehörigen Leuchtdiode AD1 ... ADn bzw. SD1 ... SDn verwendet wird. Um die Anzeige zu stabilisieren, ist jeder Leuchtdiode jeweils ein Flip-Flop AF1 ... AFn bzw. SF1 ... SFn zugeordnet. Das Alarmsignal wird darüber hinaus einem bistabilen Alarmschalter BAS zugeführt, der in üblicher Weise akustischen Alarm gibt oder die Alarmmeldung an eine übergeordnete Zentrale weiterschaltet.The alarm evaluation AA and the fault evaluation AS each contain a multiplex output device MX4 and MX5, via which an alarm signal a or a fault signal s of a specific signal line in the display device for switching on the associated LED AD1 ... ADn or SD1 ... SDn is used. To stabilize the display, a flip-flop AF1 ... AFn or SF1 ... SFn is assigned to each LED. The alarm signal is also fed to a bistable alarm switch BAS, which in the usual way gives an acoustic alarm or forwards the alarm message to a higher-level control center.
Claims (4)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2817090 | 1978-04-19 | ||
| DE2817090A DE2817090B2 (en) | 1978-04-19 | 1978-04-19 | Alarm system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0004912A1 true EP0004912A1 (en) | 1979-10-31 |
| EP0004912B1 EP0004912B1 (en) | 1983-03-02 |
Family
ID=6037467
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP79101031A Expired EP0004912B1 (en) | 1978-04-19 | 1979-04-04 | Annunciator of danger |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US4250353A (en) |
| EP (1) | EP0004912B1 (en) |
| JP (1) | JPS54142098A (en) |
| AT (1) | AT373406B (en) |
| DE (1) | DE2817090B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0106191A1 (en) * | 1982-09-22 | 1984-04-25 | Siemens Aktiengesellschaft | Multiprocessor system for a danger alarm installation |
| EP0205930A1 (en) * | 1985-05-24 | 1986-12-30 | Siemens Aktiengesellschaft | Burglary detection system |
| EP0292476A1 (en) * | 1985-12-30 | 1988-11-30 | Pacific Bell | Low speed gate circuit |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4442320A (en) * | 1981-12-04 | 1984-04-10 | Base Ten Systems, Inc. | Remote subscriber interaction system |
| US4528423A (en) * | 1981-12-04 | 1985-07-09 | Base Ten Systems, Inc. | Remote subscriber terminal unit |
| DE3214439A1 (en) * | 1982-04-20 | 1983-10-20 | Brown, Boveri & Cie Ag, 6800 Mannheim | Line testing unit |
| US5822423A (en) * | 1996-03-20 | 1998-10-13 | Numerex Investment Corporation | Apparatus and method for supervising derived channel communications |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2262823A1 (en) * | 1972-12-22 | 1974-10-10 | Controlmatic Ges F Ind Automat | ALARM AND MESSAGE SYSTEM |
| DE2341087A1 (en) * | 1973-08-14 | 1975-02-27 | Siemens Ag | Automatic fire detector system - with number of detectors connected to central control with identification of each detector |
| DE2641489A1 (en) * | 1976-09-15 | 1978-03-16 | Siemens Ag | PROCEDURE FOR TRANSFERRING DIFFERENT ANALOGUE MEASURED VALUES TO A CONTROL UNIT OF SEVERAL FIRE DETECTORS LOCATING IN A CHAIN ON A SIGNAL LINE |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3842208A (en) * | 1970-01-26 | 1974-10-15 | Paraskevakos Elect & Comm | Sensor monitoring device |
| SE391250B (en) * | 1974-11-26 | 1977-02-07 | Saab Scania Ab | SECURITY SYSTEM, INCLUDING A CENTRAL UNIT, SOMŸVIA A COMMUNICATION CHANNEL IS CONNECTED WITH SEVERAL LOCAL TERMINAL UNITS |
-
1978
- 1978-04-19 DE DE2817090A patent/DE2817090B2/en not_active Ceased
-
1979
- 1979-04-04 EP EP79101031A patent/EP0004912B1/en not_active Expired
- 1979-04-13 US US06/029,834 patent/US4250353A/en not_active Expired - Lifetime
- 1979-04-17 AT AT0283579A patent/AT373406B/en not_active IP Right Cessation
- 1979-04-19 JP JP4848279A patent/JPS54142098A/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2262823A1 (en) * | 1972-12-22 | 1974-10-10 | Controlmatic Ges F Ind Automat | ALARM AND MESSAGE SYSTEM |
| DE2341087A1 (en) * | 1973-08-14 | 1975-02-27 | Siemens Ag | Automatic fire detector system - with number of detectors connected to central control with identification of each detector |
| DE2641489A1 (en) * | 1976-09-15 | 1978-03-16 | Siemens Ag | PROCEDURE FOR TRANSFERRING DIFFERENT ANALOGUE MEASURED VALUES TO A CONTROL UNIT OF SEVERAL FIRE DETECTORS LOCATING IN A CHAIN ON A SIGNAL LINE |
Non-Patent Citations (2)
| Title |
|---|
| CONTROL AND INSTRUMENTATION, Band 10, Nr. 1, Januar 1978, London "Alarms With TDC 2000", Seiten 28, 29, 31. * Seite 28 * * |
| FUNKSCHAU, Heft 26, 1976, Munchen H. KLUTH, "Wachsame Elektronik" Seiten 1153 bis 1156. * Seite 1155, mittlere Spalte * * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0106191A1 (en) * | 1982-09-22 | 1984-04-25 | Siemens Aktiengesellschaft | Multiprocessor system for a danger alarm installation |
| EP0205930A1 (en) * | 1985-05-24 | 1986-12-30 | Siemens Aktiengesellschaft | Burglary detection system |
| EP0292476A1 (en) * | 1985-12-30 | 1988-11-30 | Pacific Bell | Low speed gate circuit |
| EP0292476A4 (en) * | 1985-12-30 | 1989-05-11 | Pacific Bell | Low speed gate circuit. |
Also Published As
| Publication number | Publication date |
|---|---|
| ATA283579A (en) | 1983-05-15 |
| JPS54142098A (en) | 1979-11-05 |
| DE2817090A1 (en) | 1979-10-25 |
| US4250353A (en) | 1981-02-10 |
| JPS6239479B2 (en) | 1987-08-24 |
| AT373406B (en) | 1984-01-25 |
| EP0004912B1 (en) | 1983-03-02 |
| DE2817090B2 (en) | 1980-10-30 |
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