10
Installation/Configuration ER600
2 - BASIC INFORMATION
2.1
HOW AN INTRUSION RADIO ALARM SYSTEM AND BUS IS MADE
2.1.1
Radio and Bus system
This main distinction between installations is based on the technology used to connect the various devices to the control panel and
each other. The radio system connection is also called wireless.
Pros
Cons
Requires no wiring: all communications occur via radio and
components can be positioned where it is most convenient.
It is sensitive to radio shielding: some materials can affect the
radio waves, impeding or making communication more difficult
among the various devices.
The devices can be easily moved if the need should arise, for
example if the arrangement of furniture should change in a room
protected by a volumetric detector.
It is more sensitive to sources of electromagnetic disturbances
(ex. electric meters, electric motors, washing machines,
refrigerators, etc.), which may make communications among the
various devices difficult.
It is possible to create a system where all the components are
powered by long-life batteries, so it is not necessary to connect
the system to the electrical power supply
*
.
It is necessary for at least one radio channel to be free (in other
words, one channel with no other systems using it).
Quick installation: it is sufficient to install the system components
where needed, with no need to wire them.
Installation times are considerably shorter, so as not to create
inconveniences in the home or workplace.
*
Not all manufacturers have radio alarm systems that can function entirely without being connected to the electrical utility.
Table 1 - Radio technology (tips)
Radio technology is particularly indicated:
in inhabited buildings or where it is not possible to intervene on the wall structure;
where wiring can be particularly costly and difficult;
for temporary intrusion alarm systems.
2.1.1.1
Radio apparatus
There are two types of radio apparatus used in the alarm systems: those that allow the system to connect to the external environment,
like the radio modules for the cell phone network, and those that allow wireless communications within the system, mainly between
radio devices and the control panel.
It is important to verify that the radio devices of the alarm system use the specific frequencies established by legislation and that they
are capable of using more than one radio channel.
Some may ask: can these radio devices create disturbances for other equipment present? Are all these electromagnetic waves
harmful?
The answer to the first question is very simple: the conformity with laws practically excludes this type of problem.
The same is true for the second question, but in this case it is better to analyse the topic in more detail. Above all, the radio devices
transmit with extremely low power; secondly they mainly work as receivers and transmit only when necessary and for durations of just
a few seconds. In other words: they almost never transmit and so do not emit electromagnetic waves; when they must do so it i s only
for very brief moments and very low power.
2.1.1.2
The bus
A particular type of connection is the bus, which can be either wired or radio. It is essentially a channel of communication that transfers
data and information among the various devices of the system, guaranteeing their interaction.
