has initiate the alarm. The detection circuits wired as a loop and capacity of panel for devices is connected to each loop. Panel output is 24VDC to operate the system and devices. Each device has microprocessor based. Device can address by given particular no with rotary switch or binary switch. Additional field devices are available which may be wired to the loop for detection only. It is possible to detect normally open contact, normally closed contact such as flow switch. To alert occupant or building management sounder as installed in loop. If any devices initiate alarm, these sounder make sound for intimation of initial stage of fire. To prevent fire relay module used to shut down air handling units, open fire dampers, ground the lifts, open all access door within premises, start pressurization fans in staircase etc.