Digidim 503AV User Manual - Page 11

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Digidim 503AV / 505 RS232 AV Interface User Guide
Data byte(s):
Pack byte(s):

DALI System Traffic

All messages present on the DALI system which are not generated by the interface, are
automatically returned from the interface. This allows complete monitoring of all activity of
the DALI system components. Other than the byte count, all messages are returned as
seen by the interface.

DALI Component Addressing

A DALI system, or sub-net, can consist of up to 63 individual components, each with its
own 'short address'. These short addresses are assigned at the time of configuration and
programming of the DALI system. In addition, any number of the individual components
can be put into a group with consequential group control. There are a total of 16 groups in
the DALI protocol and each component can belong to none, one or any number of the
groups. To allow communication to all components at the same time, a 'broadcast' address
is used.
This allows three methods of addressing: broadcast, group and individual short address (or
a total of 1 + 16 + 63 addresses, which is 80).
Other than the interface control commands, all messages can have one of 80 address
possibilities. Multiple addresses can only be sent by multiple messages; no combinations
within a single message are permitted.
Doc. No. 7860076
message echo or returned data to DALI protocol.
contents not defined; ignore.
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Helvar Ltd.
Issue 8