Telemetry and like signaling systems

Details Telemetry and like signaling systems Telemetry and like signaling systems

1983-11-14

1986-07-29

Olms, Douglas W.

Communications: electrical

Systems

Selsyn type

340505, 340518, H04M 1104, H08B 2600

Patent

active

046033181

ABSTRACT:
A system for sensing multiple conditions, such as alarm conditions, at each of a number of remote stations, the sensing being accomplished solely through a pair of power lines by means of which the remote stations are connected in a cascade arrangement with a central station. When power is applied to the first of the remote stations, a current pulse is drawn through the power lines and is modulated in accordance with a sensed condition at the remote station. At the end of the current pulse, there is at least one zero-current interval, the duration of which is varied in accordance with another sensed condition at the remote station. The central station, after applying power to the first remote station, identifies the sensed conditions from the modulated current pulses and the durations of the zero-current intervals. Each remote station also includes a line power switch that remains open until the completion of interrogation of the sensed conditions at that particular station. Then the line power switch is closed and power is transmitted to the next remote station in sequence. Additional features disclosed include the use of power for secondary purposes during zero-current intervals, the detection of cumulative sensor activity at a remote station, and a power-seeking line switch to permit remote stations to receive power from either direction.

REFERENCES:
patent: 4093946 (1978-06-01), Fowler
patent: 4162489 (1979-07-01), Thilo et al.
patent: 4206449 (1980-06-01), Galvin et al.
patent: 4290055 (1981-09-01), Furney et al.
patent: 4359721 (1982-11-01), Galvin et al.
patent: 4385287 (1983-05-01), Eatwell
patent: 4413259 (1983-11-01), Lutz et al.
patent: 4491828 (1985-01-01), Galvin et al.

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