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Short, readable definitions for common fire alarm acronyms and terms. For model-specific information, see the brand pages and manuals.
The central controller of a fire alarm system. It monitors devices, processes events, and controls notification appliances. Service and programming must be performed by licensed fire alarm technicians.
Circuit that powers and supervises notification appliances such as horns, strobes, and speakers. A NAC trouble indicates a fault that needs professional service.
Communication circuit for addressable devices. Device missing or open circuit messages usually indicate wiring or device issues that a licensed technician should diagnose.