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3

DS-DMX250 R 0.80

www.yamar.com

Tel: +972-3-5445294 Fax: +972-3-5445279

2.

Description

2.1

The DMX250 network

The DMX250 operates as part of a powerline (DC-BUS) communication network consisting of multiple DMX250

devices. The DMX/RDM data is phase modulated by a sine wave at a user predefined carrier frequency with built-

in error correction protection.

All network topologies (e.g. Star, ring, line, tree, etc.) are applicable, as long as the RX signal level at RXI is above

Users may create multiple DMX250 networks operating over a single powerline, where each network

communicates using a different carrier frequency (channel).

2.2

DMX250 channel parameters

Carrier frequency:

251 selectable frequencies between 5MHz - 30MHz with 100 kHz spacing.

Powerline bitrate:

250Kbit/s

Powerline voltage:

Any, with proper powerline coupling interfacing (see ‎2.5.6)

Cable length:

Depends on the powerline loads AC signal-attenuation (100m is practicable)

Cable type:

Any cable.

2.3

Device architecture

Figure 2 depicts the DMX250 blocks.

Figure 2 - DMX250 block diagram

The DMX250 main building blocks:

•

Protocol handling - Interprets the DMX512 & RDM protocols.

•

CODEC - Encodes/decodes the data.

•

Modem - Phase modulates and demodulates the data to and from the DC-BUS powerline.

•

Sleep - Ensures low power consumption during Sleep mode.