Monitoring system for a direct-wire alarm system
US4283717A · kind A · utility
12Cited by
5References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 1, 1979 |
| Grant date | Aug 11, 1981 |
| Priority date | — |
| Expiry date | Oct 1, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B29/06
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A direct-wire alarm system for scanning and monitoring a plurality of security alarm systems located in various user's facilities. The device monitors each line sequentially and converts current levels present on each line to a digital value. A digital filter is utilized to eliminate periodic line noise while a second digital filter is utilized to eliminate pulse noise. The system further comprises a line ringing system for notifying the user of a line condition and an adjustable comparator for obtaining high resolution of line current values.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.