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EP0834846B1
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EP
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Wireless hazard signalling system and method
Assignee: Individual
•
Filing: 1996-01-18
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Granted: 2002-01-23
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Expires: 2016-01-18
Abstract
Abstract The intruder alarm system has several detectors communicating with a central device (1). This evaluates the alarm condition from the signals provided from the detectors, as transmitted radio signals. The transmitted signals are provided via two different signal frequencies, to include a handshaking signal arrangement. A test transmitter and receiver within the central device use a test signal with at least one of these frequencies for checking the alarm signal transmission channel.
Inventors
- 👤 Peter John Goddard
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 16:04
CPC Classifications
G; G08; G08B; G08B29/00; G08B29/18; G08B29/185; G08B29/188; G08B25/00; G08B25/01; G08B25/10; G08B29/16; G08B25/008
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
75 words
Wireless hazard signalling system comprising a signalling centre (1) and at
least one signalling unit, and the signalling centre (1) receives and
evaluates a radio signal transmitted by the signalling unit in case of a
signal-relevant event, characterised by a transmit testing unit which on
detection of an alien signal by the signalling centre (1) transmits a radio test
signal on at least one frequency in order to test the availability of the
transmit channel.
Claim 2
Dependent Claim
40 words
Wireless hazard signalling system according to Claim 1, characterised by a receive testing unit (24) for receiving the radio testing signal and for
passing on an acknowledgement signal to the signalling centre (1) when
satisfactorily receiving the radio testing signal.
Claim 3
Dependent Claim
29 words
Wireless hazard signalling system according to Claim 2, characterised in
that the acknowledgement signal is passed on by wire from the test
receiver (24) to the signalling centre (1).
Claim 4
Dependent Claim
36 words
Wireless hazard signalling system according to Claim 2, characterised in
that the test receiver comprises a transponder (24) which transmits at least
one radio testing signal on at least one frequency to the signalling centre
(1).
References Cited (Backward Citations)
No citation records indexed.
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