Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1992-01-07
1993-12-07
Crosland, Donnie L.
Communications: electrical
Condition responsive indicating system
With particular system function
340518, 34082507, G08B 2600
Patent
active
052686680
ABSTRACT:
A security/fire alarm system includes a plurality of event-sensors, e.g. intrusion and smoke sensors, each being identifiable by a unique digital address defined by a multibit binary address code. A central control unit operates to repeatedly address the sensors to determine their respective alarm and/or operating status. To minimize the cycle time required to sequentially interrogate all sensors, the central control unit operates to address groups of sensors simultaneously, each of the groups consisting of a sub-plurality of all the sensors. In response to being addressed, each sensor in an addressed group of sensors transmits a different binary bit or digit of a multibit digital response code which is defined collectively by the transmitted bits. The logical state of each of such binary bits indicates the general status (i.e. normal/abnormal) of the event-sensing unit that transmitted the bit. The control unit is responsive to the multibit response code to sequentially re-address only those event-sensing units that, through their respective binary bit, have indicated an abnormal status.
REFERENCES:
patent: 4071908 (1978-01-01), Brophy et al.
patent: 4361832 (1982-11-01), Cole
patent: 4538138 (1985-08-01), Harvey et al.
patent: 4658243 (1987-04-01), Kimura et al.
patent: 4667193 (1987-05-01), Cotie et al.
patent: 4996518 (1991-02-01), Takahashi et al.
Crosland Donnie L.
Detection Systems Inc.
Kurz Warren W.
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