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10

DS-DMX250 R 0.80

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Figure 10 – Typical DMX250 to DMX/RDM controller interface

3.2

Interfacing to an existing DMX/RDM module

When interfacing to an existing DMX/RDM module that has already a built-in RS485 transceiver, an additional

RS485 transceiver is required to translate the signals to Tx and Rx 3.3V logic.

Figure 11 depicts a typical DMX250 to RS485 transceiver interface connection.

Figure 11 – Typical DMX250 to RS485 transceiver interface

3.3

DMX250 messages

3.3.1

Message structure

The DMX250 is DMX/RDM message-oriented device. The message is divided by the DMX250 into packets that are

encoded against errors and constructed into modulated powerline message (frame).

A frame is constructed from a Start-frame consisting of a preamble and optionally an arbitration sequence (in RDM

discovery process only), followed by packet/s of data bytes (at least 1 packet) and terminated with a "Frame-End”

indicating the last packet of the frame.

When the RDM discovery process is activated by the DMX-controller, unique arbitration patterns are transmitted

before the start-frame preamble pattern (see ‎3.3.4).