Monitoring system with improved alerting and locating
US4999607A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 13, 1989 |
| Grant date | Mar 12, 1991 |
| Priority date | — |
| Expiry date | Mar 13, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B25/04
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An expansive and expandable monitoring system which in one of its broadest embodiments includes a multi-sector, multi-condition monitoring system including radio linked alert monitors, smoke monitors and an expandable range of activity monitors such as door-opening monitors and toilet-flushing monitors and including method and apparatus for identifying a particular monitor within a sector; wherein each sector stands itself as a unique sub-system built about a two-wire bus on which both power identifying signals are simultaneously conveyed along the same two wires; and within each sector, the plurality of monitoring devices receive operating power from a common power source and convey identifying signals to a common discriminator (identifier) arrangement all along the common two-wire bus, each monitoring device being constructed with a unique arrangement of current modulating and signal/voltage isolation elements to facilitate the common bus--common power source--common discriminator scheme of the present invention; and wherein the system includes unique, all coded receivers including method and apparatus for accepting, encoding, conveying and decoding the coded signals of a plurali…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.