The heart of the fire alarm system is the central unit, which acts as the integration interface between all the emergency equipment installed on site. The central unit also controls other emergency-related equipment such as lifts, escalators, fire doors and smoke curtains. It transmits fire alarms and information on the operation of the fire detection system and allows remote monitoring and maintenance of the system. The central unit of the fire alarm system is controlled via a control panel or a graphical user interface.