Specifications

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5502DAL C-Bus DALI Gateway Programming Guide
© 2011 Schneider Electric. All Rights Reserved.
2.0 Concepts
The C-Bus and DALI systems share many similar concepts. This similarity provides
a basis for interconnecting the two systems. Before exploring the mapping between
the two systems, it is worth summarising the basic concepts in the two systems.
2.1 C-Bus
C-Bus is a microprocessor-controlled network system that uses Unshielded Twisted
Pair cable (UTP, Category 5e). The system is highly flexible in the way it operates
because each device communicating on C-Bus has its own inbuilt microprocessor.
These devices are field programmed with Toolkit software to provide optimum
performance in any installation.
Control messages come from input units such as key units, light level and passive
infrared occupancy sensors. Messages are sent over the C-Bus network to output
units such as relays and dimmers. These messages are used to control the loads
connected to the output units.
Unit Addresses
All units on the C-Bus network have a unique identity code called a unit address.
This code forms part of the messages sent to C-Bus, so that only one unit
corresponding to that address responds. These messages are typically used to
activate the operating variables of the C-Bus devices.
The unique unit address means that:
• AseachC-Busunithasitsownmicroprocessorwithnon-volatilememory
(EEPROM), it is possible through the unique unit address to individually
program each unit.
• TheuniqueunitaddressisthenusedbyC-Bustopasscommandsoverthe
network to specific units with instructions on what to do.
In this way you can program individual units without removing them from the
C-Bus network.
Application Addresses
An application address can identify devices on the C-Bus network. Units can be
grouped together so that commands issued to that group will not affect other groups.
For example, commands to execute scenes on the trigger control application will
not affect a load on the lighting application. This grouping separates all lighting units
from other types of units and commands.
23446_F2255-01 5502DAL C-Bus DALI Gateway APPROVED.indd 5 30/08/2011 10:38:17 AM