Introduction
Page 4
The control unit contains the main processing unit, the power supply and
stand-by battery. The stand-by battery can keep the alarm system
operational for several hours if the mains supply fails.
Several different control units are available. Each provides a different
number of zones, outputs, users and other features. The control unit
selected should match the requirements of the site.
Alarm communication
When the control unit detects an alarm, it starts an external sounder/strobe
unit and operates sounders (such as the sounder in keypads).
If configured, the control unit can also communicate alarm information to an
Alarm Receiving Centre (ARC) across the internet, or (depending on the
hardware fitted) over a fixed-line or mobile telephone network.
Also depending on the hardware fitted and system configuration, the
control unit may send alarm information by email, SMS text message, or to
a specified telephone number using a pre-recorded speech message.
SMS command message control
If the control unit has appropriate hardware fitted, you can change or query
the status of the alarm system using commands contained within SMS text
messages sent from a mobile phone or other messaging device.
You can send SMS command messages to set/unset the system,
activate/deactivate outputs, omit/un-omit zones or query the current status
of the system.
For further information, please refer to the "SMS Command Messaging
User's Guide".
Detectors (zones)
Detectors are the physical devices that detect alarm conditions. They
include devices such as passive infra-red movement detectors, door
contacts and smoke detectors. Each detector may use a wired or radio
connection to the alarm system, depending on the type of detector.
In addition to fixed detectors, the control unit can monitor small portable
Hold-Up Alarm (HUA) transmitters, which users can use to start alarms
remotely. HUA transmitters are also known as Panic Alarms (PAs).
A zone is the lowest-level item within the intrusion system that can be set
or unset, but since there is normally only one detector per zone, the terms
"zone" and "detector" are often used interchangeably.
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