The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 24, 2003
Filed:
Dec. 13, 2000
Gerhard Röpke, Lübeck-Travemünde, DE;
Job Lizenz GmbH & Co. KG, Ahrensburg, DE;
Abstract
A process to determine malfunctioning detectors in a danger signaling system having a control center and at least two-wire signaling line joined to multiplicity of detectors. Control center emits voltage-modulated digital control and interrogation data to the detectors, and the detectors when interrogated by the control center emit current-modulated digital data to the control center; if faulty data are received following an interrogation, control center emits a voltage signal to the detectors for closing the switches of all detectors; the power input of the detectors is measured and saved in a measured-value memory; the control center subsequently provides an impressed current of a preset magnitude to the line; an evaluation device opens the switch if the power input does not exceed a preset measured value and the voltage dropping on a measuring resistor reaches a preset value; the detector next in succession also opens the switch if the voltage dropping on its measuring resistor reaches its preset value and the power input does not exceed the preset maximum to identify the malfunctioning detector.