Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1990-01-23
1991-02-26
Crosland, Donnie L.
Communications: electrical
Condition responsive indicating system
With particular system function
340505, 340506, 340517, 34082506, 34082508, G08B 2600
Patent
active
049965182
ABSTRACT:
A fire alarm system includes a receiver unit connected to a plurality of terminal unit groupings, each of the terminal unit groupings made up of a plurality of terminal units. The fire alarm system operates in one of a system polling mode, a point polling mode and a selecting mode. In the system polling mode, the receiver units polls all of the terminal units and provides a grouping response period in which each of the terminal unit groupings is permitted to respond to the receiver unit polling. If one of the terminal units of a particular grouping undergoes a status change, such a terminal unit transmits to the receiver unit a group response signal during the corresponding group response period. Then, the system enters the point polling mode, in which the terminal units of the terminal unit grouping corresponding to the group response period in which a group response signal was received are polled. During a corresponding terminal unit response period, the terminal unit having the status change transmits a terminal unit response period to the receiver unit. Thereafter, the fire alarm system enters the selecting mode, in which status information is transmitted to the receiver from the terminal unit having the status change.
REFERENCES:
patent: 3516063 (1970-06-01), Arkin et al.
patent: 3559177 (1971-01-01), Benson
patent: 4400694 (1983-08-01), Wong et al.
patent: 4586040 (1986-04-01), Akiba et al.
patent: 4847593 (1989-07-01), Igarashi
Shutoku Ryuji
Takahashi Kaoru
Tsumiji Akio
Crosland Donnie L.
Nohmi Bosai Co., Ltd.
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