Model FSD901-U3 / R3 are separate LED / LCD remote annunciators that show the existing status of the 50-point addressable FACP (Model FC901). Each remote annunciator connects to the 50-point FACP through a built-in RS─485 connection on the main board. A 3.5-inch (8.9 centimeters) by 1.5” (3.8 centimeters) LCD screen will give details of the event in alphanumeric form. The display screen can be scrolled to reveal additional events. Each screen supports 182 characters: seven (7) lines with 26 characters per line. Optional remote-system-control capabilities are also available. A key-switch is also provided to prevent unauthorized access to the control operations. Additionally, Model FSD901-U3 / R3 contains navigation keys that are used for scrolling through the list of FACP events. The programming software is held in flash electrically erasable programmable read-only memory (EEPROM).