Alarm system having improved communication
US6693532B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 28, 2002 |
| Grant date | Feb 17, 2004 |
| Priority date | — |
| Expiry date | May 28, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B26/001
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An alarm system is provided which includes multiple notification appliances for signaling an alarm condition. The system controller intelligently controls the notification appliances including notification devices such as an audible or visual alarm through multi-bit digital messages sent over communication lines. The alarm system has both a standby and active mode of operation in which communication between the controller and notification appliances is possible in both modes of operation. In the standby mode, the notification appliances are powered at a first voltage level. Communication between the notification appliances and the system controller is provided by sending data pulses along the communication lines relative to the first voltage level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.