Model FDOT421 utilizes advanced, multi-criteria detection technology. The multi-criteria detector also has state-of-the-art microprocessor circuitry
(with error check), as well as detector selfdiagnostics and supervision programs that is used on Desigo Fire Safety 50-point (Model FC2005),
252-point (Model FC2025 / FV2025) and 504-point (Model FC2050 / FV2050) addressable fire alarm control panels (FACPs).
https://www.downloads.siemens.com/download-center/d/FDOT421-...

https://en.wikipedia.org/wiki/Fire_alarm_control_panel
A Fire Alarm Control Panel (FACP), or Fire Alarm Control Unit (FACU), is the controlling component of a Fire Alarm System. The panel receives information from environmental sensors designed to detect changes associated with fire, 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 sensor, control, transmitter, or relay.
There are four basic types of panels: coded panels, conventional panels, addressable panels, and multiplex systems.

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Note added at 3 hrs (2016-08-11 23:09:19 GMT)
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Addressable Fire Alarm Control Panel employ one or more Signaling Line Circuits - usually referred to as loops or SLC loops
Each device on a SLC has its own address, and so the panel knows the state of each individual device connected to it. Common addressable input (initiating) devices include:

https://www.silentknight.com/Pages/Category.aspx?category=Ad...
The IntelliKnight 5600 is a 25 point single loop hybrid conventional-addressable fire alarm control/communicator system. It provides the value and performance of addressable technology combined with an easy to use conventional interface. A perfect fit for small fire alarm or sprinkler supervisory applications.
The IntelliKnight 5820XL is a 127 point, expandable to 792 points, multi-loop addressable fire alarm control/communicator system. Powerful features such as drift compensation, maintenance alert, built-in digital communicator, and distributed intelligent power are delivered in this powerful FACP from Silent Knight.

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Note added at 10 hrs (2016-08-12 05:30:47 GMT)
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Hope my answer helps.

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Note added at 13 hrs (2016-08-12 08:30:28 GMT)
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Ask more. This is my beloved theme. Two years ago i had a long romance with FACU...

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Note added at 4 days (2016-08-16 09:11:12 GMT) Post-grading
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Děkuji!