Bidirectional, interactive fire detection system
US4470047A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 4, 1982 |
| Grant date | Sep 4, 1984 |
| Priority date | — |
| Expiry date | Feb 4, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B17/00
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A communication system useful for fire detection which transfers data/commands bidirectionally between a controller and connected transponders on a real time, interactive basis. This system makes possible accurate data recovery, whether a transponder has its output shorted, or although multiple transponders are replying and makes possible the remote determination and constant monitoring of transducer sensitivity, at the controller. The sensitivity can be adjusted remotely at the controller, and different transducers can have different thresholds simultaneously, which can be changed collectively or individually to different settings manually or automatically at the controller. The system transmits reference data for supervision of system accuracy. Compensation for long-term changes is provided for both transponders and reducers in this system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.