EP 0814445 B1 20031217 - Automatic self-testing alarm system with supervision signal analysis
Title (en)
Automatic self-testing alarm system with supervision signal analysis
Title (de)
Automatisches Alarmsystem mit Überwachungssignalanalyse
Title (fr)
Système d'alarme automatique avec analyse d'un signal de surveillance
Publication
Application
Priority
- US 65029296 A 19960520
- US 68571696 A 19960724
- US 68553996 A 19960724
Abstract (en)
[origin: EP0814445A2] A self-testing data communications system suitable for use with an alarm system. In a first aspect the communications system is capable of modifying an operational parameter such as the input signal sensitivity of a receiver located at a monitoring station during receipt of a supervision signal from a remote alarm device, in order to ensure that a non-supervision alarm signal will be properly received when the operational parameter is again returned to its normal state. In a second aspect, the receiving element of the communications system is capable of receiving the message simultaneously at two different sensitivity levels, and during a supervision message, the lower sensitivity path is used in order to ensure that non-supervision alarm messages are received with an adequate signal margin. In a third aspect, the receiving element of the communications system is capable of measuring the signal strength (RSSI) of the received message signal and comparing it, if it is a supervision message, to a predetermined threshold value. When the supervision RSSI signal is above the threshold, the received message is passed to the control as being validly received; when the supervision RSSI signal is not above the threshold, then the message is ignored. <IMAGE>
IPC 1-7
IPC 8 full level
G08B 29/12 (2006.01)
CPC (source: EP)
G08B 29/123 (2013.01)
Designated contracting state (EPC)
DE ES FR GB IT NL
DOCDB simple family (publication)
EP 0814445 A2 19971229; EP 0814445 A3 19990414; EP 0814445 B1 20031217; DE 69726793 D1 20040129; DE 69726793 T2 20040617; ES 2208814 T3 20040616
DOCDB simple family (application)
EP 97201449 A 19970520; DE 69726793 T 19970520; ES 97201449 T 19970520