Identification and warning of alarm condition is such as fire systems uses detectors with associated warning message recordings

摘要

The presence of a fire is detected by a specific smoke detector [1] and the unit has a recorded message and transmitter/ receiver, RT, [2] This relays the message 'fire in area 1' to other RT units [2', 2'']. In this way the warning is relayed throughout a building. The system may also be used with intruder detection sensors.