SYSTEM AND METHOD OF EMERGENCY OPERATION OF AN ALARM SYSTEM

摘要

An ambient condition monitoring system (10) includes a common control unit (12), at least one primary communications bus (18) and at least one supplemental communications bus (20a-c). The control unit (12) communicates with a plurality of supplemental units, which could include ambient condition detectors, using the primary communications bus in a normal operating environment. In the event of a sensed failure of the primary bus, or one of the supplemental units, communications can be automatically implemented using the supplemental communications bus.