Communications: electrical – Condition responsive indicating system – Specified housing
Patent
1989-05-01
1990-10-09
Orsino, Joseph A.
Communications: electrical
Condition responsive indicating system
Specified housing
340505, 340518, 340533, G08B 2300
Patent
active
049623737
ABSTRACT:
An arrangement for conserving the alarm-state power supplied to numbers of light emitting devices included in respective addressable terminal units of a fire alarm system or the like. The addressable terminal units are connected to a transmission line or loop; and a loop controller cyclically transmits address signals to the terminal units (polling routine); the controller functions, responsive to received data from those units, to generate an alarm-state display command signal for causing illumination of the light emitting devices of terminal units that are in alarm. In the case where a terminal unit comprises a master transponder to which a group of non-addressable conventional "slave" detectors is connected, the loop controller is programmed to disconnect such slave detector from the loop or line when more than one of them is in alarm. However, in the event of a large number of terminal units at scattered locations being in alarm, a tell-tale signal from each unit is highly desirable. Accordingly, it is arranged that all of their light emitting devices will be capable of indicating an alarm state. To this end, a blinking mode of operation is selected, whereby limited groups of devices (except for one) are turned on in sequence, the "ON" times being the same for all off the devices, but the "OFF" times being varied in dependence on the total number of devices being supplied with power. Consequently, power ON is time-divided among the groups, so that the total power consumed by all groups is no greater than would be consumed by a single group.
REFERENCES:
patent: 4103337 (1978-07-01), Whiteside
patent: 4489312 (1984-12-01), Yoshizaki
patent: 4506255 (1985-03-01), Saski
patent: 4518952 (1985-05-01), Tanaka et al.
patent: 4525700 (1985-06-01), Kimura et al.
patent: 4531114 (1985-07-01), Topol et al.
patent: 4550306 (1985-10-01), Kimura
patent: 4581604 (1986-04-01), Kimura et al.
patent: 4636649 (1987-01-01), Kimura et al.
patent: 4658243 (1987-04-01), Kimura et al.
patent: 4668939 (1987-05-01), Kimura et al.
patent: 4673920 (1987-06-01), Ferguson et al.
patent: 4701625 (1987-10-01), Kimura
patent: 4725819 (1988-02-01), Sasaki et al.
patent: 4725821 (1988-02-01), Kimura et al.
patent: 4733224 (1988-03-01), Kimura
patent: 4742335 (1988-05-01), Vogt
patent: 4850018 (1989-07-01), Vogt
General Signal Corporation
Hubbard Robert R.
Mullen Jr. Thomas J.
Ohlandt John F.
Orsino Joseph A.
LandOfFree
Scheme for power conservation in fire alarm system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Scheme for power conservation in fire alarm system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Scheme for power conservation in fire alarm system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-975849