3.0—Home Security and Surveillance Systems
3.0—Home Security and Surveillance Systems
3.0—Home Security and Surveillance Systems
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138<br />
Chapter<br />
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3<br />
Physical Devices<br />
The six major physical components of a home security <strong>and</strong> surveillance system<br />
are described in this section. Although some designs include additional<br />
components for enhanced performance or custom installations, the physical<br />
devices described here are considered the basic building blocks for a security<br />
<strong>and</strong> surveillance system that will provide adequate protection from intrusion.<br />
The essential physical assemblies include<br />
➤ Keypads<br />
➤ Sensors<br />
➤ <strong>Security</strong> panels<br />
➤ Cameras<br />
➤ Monitors<br />
➤ Switchers<br />
Keypads<br />
The keypad is the device used by the home residents to initiate comm<strong>and</strong>s<br />
for control options <strong>and</strong> observe the status of the security system. As shown<br />
in Figure 3.3, it usually contains an alphanumeric keypad <strong>and</strong> LED displays<br />
that indicate the status of the alarm system.<br />
Figure 3.3 Keypad.<br />
The keypad is used to arm <strong>and</strong> disarm the system <strong>and</strong> often includes a panic<br />
switch by which the alarm can be triggered instantly in an emergency situation.<br />
The alarm can be silenced by the owner by entering the correct coded<br />
sequence of numbers on the numerical keypad. The keypad is typically<br />
installed inside the home near a door that is most frequently used by the residents.<br />
A programmed delay is included as a feature of most systems to<br />
enable the users to enter <strong>and</strong> disarm the system within a fixed delay period<br />
(normally 30–45 seconds). The same fixed delay is also used to allow the user<br />
to arm the system <strong>and</strong> exit the home within the fixed delay period. Keypads<br />
can also be used to bypass certain areas.<br />
The bypass function is used to arm the system but disable selected zones or motion<br />
detectors inside the home when the family is present. Residents often desire to secure<br />
the perimeter area of doors <strong>and</strong> windows after retiring for the evening but need to<br />
bypass interior area motion detection sensors that are activated only when the home<br />
is not occupied.