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You may improve this article, discuss the issue on the talk page, or create a new article, as appropriate. The panel receives information from devices designed to detect and report fires, monitors their operational integrity and provides for automatic control of equipment, and transmission of information necessary to prepare the facility for fire based on a predetermined sequence. The panel may also supply electrical energy to operate any associated initiating device, notification appliance, control, transmitter, or relay. There are four basic types of panels: coded panels, conventional panels, addressable panels, and multiplex systems.
Coded panels were the earliest type of central fire alarm control, and were made during the 1800s to the 1970s. Large panels could take up an entire wall in a mechanical room, with dozens of code wheels. Smaller panels could be set up in one of two ways. Most of the time, the panel would only have one zone, and therefore, only one code.