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

Doc. No. 7860076 Page 8 Issue 8

6. Programming a DIGIDIM system

Before commands can be sent to the DIGIDIM system it has to be programmed.

Programming usually covers assigning device addresses, allocation of groups and setting

scene levels. This is done with DIGIDIM Toolbox Software or, in case of a small system,

with the DIGIDIM IR remote controller 303.

Note: Ensure that you fully understand the operation of the ‘Toolbox’ Software before

programming. For full instructions on the use of the application see the DIGIDIM

Toolbox online help manual.

7. Messages

Refer to documents ‘RS232 to DALI Command List’ (7860077) and ‘RS232 to 900 Lighting

Router Command List’ (D004102,) for more information on messaging formats.

7.1. Message Handling

Synchronisation

Data transfer to the interface is auto-synchronising. An incomplete or damaged string of

message bytes will be discarded after approximately 3 byte periods. Subsequent bytes will

be considered a new message string.

Data Transfer

Messages are handled singularly. Passing a message to the interface will generate a reply,

either as a message acknowledgement or the returned data to a query request. A

subsequent message can not be passed to the interface until after the reply; an attempt to

do so will result in its loss.

Each transmitted message will result in a single return message.

7.2. Message Structure

Transmission to Interface

This is the message to be transmitted to the DALI system or to configure the interface.

The normal message type is 3 bytes; 4 or 5 bytes for special types.

Length byte: this defines the number of bytes to FOLLOW.

Message type: refer to following description.

DALI data byte(s): 2 bytes to the DALI protocol: 1

byte is address and 2

command or data.

Return from Interface

This is the message from the DALI system, or acknowledgement from the interface.

The message can be 2, 3 or 4 bytes in size.

Length byte: this defines the number of bytes to follow.

Message type: defines reply status and if there is data to follow (refer to table in

section 8.3 Message List).

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