Which component of the fire alarm control panel provides user feedback and interface, such as LEDs and keypads?

• A. Annunciation/interface components.
• B. End-of-Line resistor.
• C. The main processor/power supply.
• D. Signaling line circuits.

Answer: (A)

The part that provides user feedback and interaction on a fire alarm control panel is the annunciation/interface components. These are the LEDs, displays, keypads, and other indicators that let you see the system’s status—whether it’s normal, in alarm, or in a trouble condition—and give you controls to respond, like silencing horns, acknowledging alarms, or resetting the panel.

This is distinct from other parts: the main processor/power supply handles the internal processing and power for the system; the end-of-line resistor is used to monitor wiring integrity on circuits; and signaling line circuits carry the alarm signals between devices and the panel. The human-facing feedback and control points are the annunciation/interface components, making them the natural answer for how users interact with the system.