Points & Deviations - A pattern language for fire alarm systems
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Peter Molin and Lennart Ohlsson
University College of Karlskrona/Ronneby
Department of Computer Science and Business Administration
Soft Center
S-372 25 Ronneby
Sweden
Peter.Molin@ide.hk-r.se,Lennart.Ohlsson@ide.hk-r.se

Abstract
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After an object-oriented framework for micro-processor based fire
alarm systems had been implemented and the first instantiated system
had reached product status an effort was undertaken to clearly
document the architecture embedded in the framework. The result of
this effort was a small pattern language which is presented in this
paper. Important patterns are the Point pattern, which covers the
abstraction of sensors and actuators, and the Deviation pattern which
deals with alarms, faults and other abnormal conditions. The described
framework is intended to cover a spectrum of fire alarm systems
ranging from small office systems to large complex systems intended
for industrial multi-building plants.