EP0529140B1 - Verfahren zur Übertragung binärer Daten in einem Gefahrenmeldesystem - Google Patents

Verfahren zur Übertragung binärer Daten in einem Gefahrenmeldesystem Download PDF

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Publication number
EP0529140B1
EP0529140B1 EP91114664A EP91114664A EP0529140B1 EP 0529140 B1 EP0529140 B1 EP 0529140B1 EP 91114664 A EP91114664 A EP 91114664A EP 91114664 A EP91114664 A EP 91114664A EP 0529140 B1 EP0529140 B1 EP 0529140B1
Authority
EP
European Patent Office
Prior art keywords
signal
value
detector
detectors
central control
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.)
Expired - Lifetime
Application number
EP91114664A
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German (de)
English (en)
French (fr)
Other versions
EP0529140A1 (de
Inventor
Peer Dr.-Ing. Thilo
Klaus Kaiser
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG, Siemens Corp filed Critical Siemens AG
Priority to DE59108333T priority Critical patent/DE59108333D1/de
Priority to DK91114664.5T priority patent/DK0529140T3/da
Priority to ES91114664T priority patent/ES2093663T3/es
Priority to EP91114664A priority patent/EP0529140B1/de
Priority to AT91114664T priority patent/ATE145080T1/de
Publication of EP0529140A1 publication Critical patent/EP0529140A1/de
Application granted granted Critical
Publication of EP0529140B1 publication Critical patent/EP0529140B1/de
Priority to GR960402846T priority patent/GR3021566T3/el
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
    • G08B25/01—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium
    • G08B25/04—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium using a single signalling line, e.g. in a closed loop
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
    • G08B25/01—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium
    • G08B25/018—Sensor coding by detecting magnitude of an electrical parameter, e.g. resistance

Definitions

  • Document EP-A-241574 describes a hazard detection system with a central unit, to which a plurality of detectors are connected with a double line, which are supplied with energy and digital data by the central unit via this double line, the line voltage data being modulated on become.
  • the present invention is therefore based on the problem of ensuring the energy supply to the detectors in a low-effort manner and at the same time ensuring the trouble-free and rapid transmission of large amounts of data between the control center and the individual detectors.
  • the problem is solved by a method for the transmission of binary data in a hazard detection system according to claim 1.
  • comparators are provided in the individual detectors, the respective switching threshold of which can be preset.
  • the threshold values of the respective comparators are determined and stored by the control center by first sending a synchronization signal to prepare a detector from the control center and then sending a signal (change in line voltage) to the detector, the amplitude of which is systematically changed in such a way that their value successively approaches the comparator threshold value, whereupon this detector sends a characteristic signal (change in line current) to the control center if the amplitude value is greater than that Is a threshold value and the comparator threshold value is determined in the control center from the characteristic signal by means of a current measuring device and the systematically changeable signal.
  • the systematically changeable signal can be a step-up signal and the characteristic signal can be formed from a sequence of binary "ones" for each amplitude value of the step-up signal that is greater than the comparator threshold.
  • a possible length of the step-increasing signal is one byte, one step of this signal being the duration of a Bits, so that there are eight amplitude values.
  • the required length of the systematically changeable signal is determined from the desired accuracy with which the comparator threshold value is to be determined.
  • the minimum and maximum value of this signal corresponds to the minimum and maximum value of a conventional data signal, so that the entire amplitude range occurring during operation is recorded.
  • the energy supply to the detectors and the determination of the comparator threshold values take place chronologically.
  • Fig. 1 shows a hazard detection system with a control center Z, with which a plurality of detectors M1 to Mn are connected by means of a double line a, b. Further double lines are indicated schematically, on which a large number of detectors are also arranged.
  • FIG. 2 The basic course of the line voltage and the line current over time is shown in FIG. 2. It can be seen that during the phases of the energy supply to the detectors there is a high voltage on the double line and a high line current flows in order to charge the storage capacitors of the detectors. During the phases of data transmission, there is a significantly lower voltage on the double line and a significantly lower line current flows. 2 only the mean values of the voltage and the current are shown; During the phases of the data transmission, both the voltage and the current are superimposed on data signals.
  • the transmission from the control center Z to the detectors M1 to Mn is accomplished with a modulation of the line voltage supplied by the control center Z and the transmission from the individual detectors M1 to Mn to the control center Z with a modulation of the line current. Settings are therefore required for low-interference evaluation of current signals (in the control center) and voltage signals (in the detector).
  • FIG. 3 shows such a device for low-interference evaluation of current signals in the control center Z.
  • a double line a, b is fed by a voltage source Ub.
  • This voltage source Ub can be controlled in a known but not shown manner by a microcomputer MR.
  • a measuring resistor R is arranged in series with the voltage source Ub.
  • Two test leads L1, L2 tap the voltage dropping at the measuring resistor R due to the line current and feed them to an analog-digital converter ADW.
  • This analog-to-digital converter ADW is connected to the microcomputer MR via lines aL.
  • Fig. 4 shows a voltage measuring device in a detector M, in which a voltage divider R1, R2 is arranged between the wires of the double line a, b and whose center tap is connected to a comparator K by means of a line L.
  • the output of the comparator K is connected to a microcomputer MR by means of a line kL.
  • the threshold value of the comparator K is preset and designed so that it switches in the range of the signal voltages that occur.
  • the data signal sent from the control center Z and modulated onto the voltage is set in a detector-specific manner such that the respective comparator threshold of a detector fits optimally.
  • the corresponding setting values i.e. So the respective comparator threshold values of the individual detectors are stored in the control center Z.
  • These setting values are determined in a special setting procedure in which the voltage on the double line a, b is systematically changed by the control center Z in a dialog between a detector M and the control center Z, and the transmission quality is checked in each case in the detector M and the result of the control center Z is transmitted. This procedure will be explained in more detail below with reference to FIG. 5.
  • the comparator threshold Uk is determined in two steps. First, the control center applies a synchronizing signal Sy to the line. This Signal Sy is so high that the comparator K of the detector M just addressed responds in any case. The detector M is prepared for the following procedure by the synchronous signal Sy.
  • a signal C1 which rises in a step-like manner, is now applied from the central station Z to the double line a, b.
  • the signal C1 consists of 4 stages. Of course, there can be more.
  • the comparator threshold Uk is exceeded in the third stage of the step-increasing signal C1.
  • This characteristic signal CA1 consists of a sequence of binary "ones" for each stage of the step-increasing signal C1, which lies above the comparator threshold Uk.
  • the control center Z can determine the voltage range Uh1, Uh2 between which the comparator threshold Uk must lie from the course of the signal C1 which rises in a step-like manner and the characteristic signal CA1.
  • FIG. 5 it is further shown how a more precise determination of the comparator threshold value can be carried out in a second, identical step.
  • the synchronizing signal Sy is first again applied from the central station Z to the double line a, b.
  • detector M is prepared for the following procedure again.
  • Another step-like rising signal C2 is then sent to the detector.
  • This signal C2 now does not cover the entire amplitude range occurring with data signals, but only the range between the voltages Uh1 and Uh2 determined in the first step.
  • This voltage range is now scanned again in 4 stages by the signal C2, the comparator threshold Uk being exceeded after the second stage and the detector correspondingly for each stage of the signal C2, which is above the comparator threshold Uk, a binary "one" by means of modulation of the line current IL to the central Z sends. From the second step-increasing signal C2 and the second characteristic signal CA2 in the control center Z a more accurate calculation of the comparator threshold Uk can be performed.
  • the comparator threshold Uk it can be determined in several steps or in only one step using a step-like signal with significantly more steps.
  • the determination procedure is carried out at least once after the system has been set up for initialization and can be repeated as often as required.

Landscapes

  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Alarm Systems (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)
  • Control Of Transmission Device (AREA)
  • Selective Calling Equipment (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)
EP91114664A 1991-08-30 1991-08-30 Verfahren zur Übertragung binärer Daten in einem Gefahrenmeldesystem Expired - Lifetime EP0529140B1 (de)

Priority Applications (6)

Application Number Priority Date Filing Date Title
DE59108333T DE59108333D1 (de) 1991-08-30 1991-08-30 Verfahren zur Übertragung binärer Daten in einem Gefahrenmeldesystem
DK91114664.5T DK0529140T3 (enrdf_load_stackoverflow) 1991-08-30 1991-08-30
ES91114664T ES2093663T3 (es) 1991-08-30 1991-08-30 Procedimiento para la transmision de datos binarios en un sistema de señalizacion de peligro.
EP91114664A EP0529140B1 (de) 1991-08-30 1991-08-30 Verfahren zur Übertragung binärer Daten in einem Gefahrenmeldesystem
AT91114664T ATE145080T1 (de) 1991-08-30 1991-08-30 Verfahren zur übertragung binärer daten in einem gefahrenmeldesystem
GR960402846T GR3021566T3 (en) 1991-08-30 1996-11-07 Binary data transmission method in an alarm signalling system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP91114664A EP0529140B1 (de) 1991-08-30 1991-08-30 Verfahren zur Übertragung binärer Daten in einem Gefahrenmeldesystem

Publications (2)

Publication Number Publication Date
EP0529140A1 EP0529140A1 (de) 1993-03-03
EP0529140B1 true EP0529140B1 (de) 1996-11-06

Family

ID=8207099

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91114664A Expired - Lifetime EP0529140B1 (de) 1991-08-30 1991-08-30 Verfahren zur Übertragung binärer Daten in einem Gefahrenmeldesystem

Country Status (6)

Country Link
EP (1) EP0529140B1 (enrdf_load_stackoverflow)
AT (1) ATE145080T1 (enrdf_load_stackoverflow)
DE (1) DE59108333D1 (enrdf_load_stackoverflow)
DK (1) DK0529140T3 (enrdf_load_stackoverflow)
ES (1) ES2093663T3 (enrdf_load_stackoverflow)
GR (1) GR3021566T3 (enrdf_load_stackoverflow)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2397156A (en) * 2003-01-03 2004-07-14 Leeds Electronic Eng Ltd Alarm system with reduced wiring

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3588828A (en) * 1967-08-02 1971-06-28 Dutton Hayward H Signaling system responsive to pulses within an amplitude range
DE2716506A1 (de) * 1977-04-14 1978-10-19 Dieter Eberhard Vorrichtung zur bestimmung des alarmausloeseortes in alarmanlagen
DE3043357C2 (de) * 1980-11-17 1985-01-17 Siemens AG, 1000 Berlin und 8000 München Verfahren und Vorrichtung zur Widerstandsmessung an einer Meldeleitung
JPS60117939A (ja) * 1983-11-30 1985-06-25 Matsushita Electric Works Ltd 情報伝送方式
EP0241574B1 (en) * 1986-03-31 1997-10-29 Matsushita Electric Works, Ltd. Fire alarm system

Also Published As

Publication number Publication date
DE59108333D1 (de) 1996-12-12
ATE145080T1 (de) 1996-11-15
ES2093663T3 (es) 1997-01-01
EP0529140A1 (de) 1993-03-03
DK0529140T3 (enrdf_load_stackoverflow) 1997-02-17
GR3021566T3 (en) 1997-02-28

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