5.1. Introduction to Alarm Systems
This section presents the concepts and definitions used to describe alarm systems in general and Laddie in particular.
5.1.1. Sensors
An alarm sensor is a small device or switch that detects movement in a room or activity in an area. An alarm system monitors several alarm sensors and reports any unexpected activity they pick up. The area that a sensor protects is called a zone. Zones are given names that usually describe the area protected; typical zone names might include Garage, Second Floor Windows, and Refrigerator.
Figure 5-1 shows an example arrangement of sensors and zones for a small business. There are door sensors on the front and back doors and a motion detector that looks for movement near the office ...
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