# US 6,703,931 B2 · Multifrequency monitoring and/or alarm device and process > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 6,703,931 B2 - Document ID: US6703931B2 - Status: Granted - Kind: B2 - Application number: 09/985,809 - Filed: 2001-11-06 - Published: 2002-05-16 - Granted: 2004-03-09 - Earliest claimed: 2000-11-06 - Assignees: Atral - Inventors: Gilles Morey; Gaston Laurens - Web page: https://patentgrep.com/patent/US6703931B2 ## CPC - G08B 25/10: using wireless transmission systems {(G08B25/009 takes precedence)} - G08B 3/10: using electric transmission; using electromagnetic transmission - G08B 5/36: using visible light sources - G08B 25/14: Central alarm receiver or annunciator arrangements - G08B: SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS ## Abstract Monitoring and/or alarm device and process including a central unit, at least one intrusion detection peripheral facility, signalling elements and radio link elements allowing radio links on several redundant channels between the central unit and at least one intrusion detection peripheral facility, via which channels this peripheral facility is able to transmit signals to this central unit and wherein elements check the capacity or availability of each of the link channels to transmit the expected signals, elements count the number of available channels and/or the number of unavailable channels and transmission elements transmit to the signalling elements a control signal corresponding to the number of available channels and/or to the number of unavailable channels so as to selectively activate these signalling elements as a function of the state of the control signal. ## Claims ### Claim 1 Monitoring and/or alarm device comprising: a central unit, at least one intrusion detection peripheral facility, a signalling element with a radio link allowing radio links on several redundant link channels, means (20) for checking a capacity or availability of each of the link channels and of said at least one intrusion detection peripheral facility, wherein, said peripheral facility is able to transmit signals, via the link channels, to said central unit, and the central unit comprises means (32) for counting a number of link channels available to transmit the signals and/or a number of unavailable link channels, and transmission means for transmitting to the said signalling element (5) a control signal corresponding to the number of available channels and/or to the number of unavailable channels so as to selectively activate the signalling element as a function of the state of the control signal. ### Claim 2 (depends on 1) Monitoring and/or alarm device according to claim 1, characterized in that said signalling element (5) comprises means for being activated according to at least two different modes of operation as a function of at least two states of the said control signal. ### Claim 3 (depends on 1) Monitoring and/or alarm device according to claim 1, characterized in that said signalling element (5) comprises audible, luminous or electrical means. ### Claim 4 (depends on 1) Monitoring and/or alarm device according to claim 1, characterized in that the means (20) for checking the availability of each of said link channels comprise means for measuring a noise level in each of said channels and means for checking a presence of an expected signal originating from a peripheral facility (1). ### Claim 5 (depends on 1) Monitoring and/or alarm device according to claim 1, characterized in that said transmission means (5a, 6a) deliver said control signal each time the number of available and/or unavailable channels is modified during at least one specified duration. ### Claim 6 (depends on 1) Monitoring and/or alarm device according to claim 1, characterized in that said signalling element (5) comprises means (33) for being activated into different modes of operation according to whether said transmission means transmit said control signal or a signal corresponding to an intrusion detection. ### Claim 7 Monitoring and/or alarm process utilizing a central unit, at least one intrusion detection peripheral facility, a signalling element with a radio link allowing radio links on several redundant link channels between the central unit and the at least one intrusion detection peripheral facility, said peripheral facility able to transmit signals to the central unit based on a verified capacity or availability of each of said link channels comprising the steps of: counting a number of available link channels to transmit the signals and/or a number of unavailable link channels, and transmitting to said signalling element a control signal corresponding to said number of available channels and/or to said number of unavailable channels so as to selectively activate said signalling element as a function of a state of said control signal. ### Claim 8 (depends on 7) Monitoring and/or alarm process according to claim 7, comprising the further step of activating said signalling element according to at least two different modes of operation as a function of at least two states of said control signal. ### Claim 9 (depends on 7) Monitoring and/or alarm process according to claim 7, comprising the further step of measuring a noise level in each of said link channels and checking the presence of an expected signal originating from a peripheral facility. ### Claim 10 (depends on 7) Monitoring and/or alarm process according to claim 7, comprising the further step of delivering said control signal each time the number of available and/or unavailable channels is modified during at least one specified duration. ### Claim 11 (depends on 7) Monitoring and/or alarm process according to claim 7, comprising the further step of activating said signalling element, into different modes of operation according to whether said transmission step transmits said control signal or a signal corresponding to an intrusion detection. ### Claim 12 A monitoring device, comprising: a central unit (4); at least one intrusion detector (1, 2, 3); and a signalling element (5) allowing radio links to the central unit on several redundant link channels; the central unit comprising a means for counting a number of link channels available to transmit the signals, and transmission means for transmitting to the signalling element a control signal corresponding to the number of link channels available to transmit the signals so as to selectively activate the signalling element as a function of a state of the said control signal. ### Claim 13 (depends on 12) The monitoring device of claim 12, further comprising a means for checking an availability of the at least one intrusion detector, and wherein the at least one intrusion detector is able to transmit signals to the central unit via available link channels. ### Claim 14 (depends on 13) The monitoring device of claim 13, wherein, the signalling element comprises means for being activated according to at least two different modes of operation as a function of at least two states of the control signal. ### Claim 15 (depends on 13) The monitoring device of claim 13, wherein, the signalling element is an audible and a luminous signalling part. ### Claim 16 (depends on 12) The monitoring device of claim 12, wherein the central unit further comprising: means for checking means for measuring a noise level in each of the link channels; and means for checking a presence of an expected signal originating from the at least one intrusion detector. ### Claim 17 (depends on 12) The monitoring device of claim 12, wherein, the transmission means deliver the control signal each time the number of available link channels is modified during at least one specified time duration. ### Claim 18 (depends on 12) The monitoring device of claim 12, wherein the signalling element comprises means for being activated into different modes of operation according to whether the transmission means transmit the control signal or a signal corresponding to an intrusion detection. ### Claim 19 (depends on 12) The monitoring system of claim 12, further comprising means for checking the availability of the at least one intrusion detector. ### Claim 20 (depends on 12) The monitoring system of claim 12, comprising plural of the intrusion detector, each of the plural intrusion detectors able to transmit signals to the central unit via available link channels.