urmet domus 1067/024, Руководство по установке

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DS1067-063D
32
LBT20064
2.3.3.3 Communicator
The communicator is an interface, sometimes also called the auto-dialler, which enables the system to send alarm
signals or other signals at a distance and, if configured to do so, receive commands from remote. There are two types of
devices: the one to connect to the traditional telephone network (PSTN) and the one to connect to the mobile phone
network (GSM and later). The two interfaces can co-exist in the same system, where each one constitutes the back-up of
the other. These interfaces are usually hosted inside the control panel, but they can also be an independent device,
physically separated from it.
The signals sent from a communicator can be either vocal or SMS (towards telephone numbers) or in numeric format (for
an alarm reception centre). The commands can be received from the control panel in the form of DTMF signals or SMS,
or in numerical format. What can be obtained by using a communicator depends on the network and on the channel of
communication used, as well as the functions the control panel can carry out.
The level of detail of the signals received may vary considerably and depend on the control panel, on the channel of
communication used, and on the auto-dialler. It may range from a simple vocal message like "Intrusion alarm in ....street"
to a signal that includes the indication of which detector signalled the alarm, the time it occurred, and so forth.
2.3.4 The complementary devices
The complementary devices complete the alarm system by adding functions and simplifying its use. The main
complementary devices are:
2.3.4.1 Keypad
The keypad is a device with multiple functions, including:

authenticating the users on several levels;

totally or partially arming and disarming the alarm system;

signalling alarms saved and potential malfunctions;

activating alarms;

programming the alarm system;

enabling and disabling functions.
The keypad has the advantage, compared to other systems used to arm and disarm the alarm system, of separating the
physical objects that acts (the keypad) from the enabling to do it (the authentication code that the user memorizes),
contributing to a higher level of security. Some keypads have other functions, like the possibility to conduct ambient
listening or establish a remote vocal communication.
Not all the keypads are separate objects. In some cases, the keypad is an integral part of the control panel.
2.3.4.2 Reader
The readers are devices for totally or partially arming and disarming the alarm system. They are typically located outside
of the space protected by the system. The reader has LEDs to signal the system status (armed/disarmed) and potential
alarms or anomalies present. The two most common types of readers are those with electronic keys and a transponder.
With the first, a device with surface contacts that resembles a key (hence the name) is introduced into the reader. With
the second, a proximity key is put near the reader. In both cases the reader reads a code that, if recognised, enables the
system status to be changed.
They are easier to use than a keypad, but the electronic and proximity keys should be stored carefully and kept separate
from the other security keys (it is the same time of precaution taken with a debit card and its PIN).
2.3.4.3 Remote control
The remote control is a radio device that allows the arming and disarming of the alarm system from a distance. The latest
models have the possibility to personalise the use of some keys, for example to activate or deactivate a commandable
output. For this type of device, the warnings indicated for the reader are also valid.
2.3.4.4 Power supply
The power supply is used to provide electricity to the system devices, drawing it from the electrical network and
transforming it into low voltage.
The supplementary power supplies are used when those already present, like the one of the control panel, are not
capable of distributing all the electricity necessary or when, due to long connection wires, the correct voltage may not be
reaching the remote device.
The more advanced power supplies make it possible to also connect a local back-up battery.
More detailed information on how the alarm system is powered can be found in
The alarm system power supply .
2.3.4.5 Expansion
The generic term of expansion is used to identify an entire series of devices that can increase the dimension of the
system or add new functions or capacities to it.