Crestron SP-SC Podręcznik Użytkownika Pobierz pdf (Strona 11)

Digidim 503AV / 505 RS232 AV Interface User Guide Helvar Ltd.

Doc. No. 7860076 Page 9 Issue 8

Data byte(s): message echo or returned data to DALI protocol.

Pack byte(s): contents not defined; ignore.

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.

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Crestron SP-SC Podręcznik Użytkownika Strona 11