DMX Lighting: A Brief Overview
DMX512 is a standard for digital communication networks commonly used to control lighting and effects. It was originally developed for controlling stage lighting dimmers, but it has since expanded to various applications, including non-theatrical interior and architectural lighting, electronic billboards, and stadium concerts.
Key Points:
- Functionality: DMX (Digital Multiplex) is a unidirectional protocol used to control devices such as lights or fog machines. It allows for the control of individual lights or groups of lights assigned to one or more channels.
- Network: DMX512 is a bus network that can be no more than 400 meters long, with not more than 32 unit loads (individual devices connected) on a single bus. If more than 32 unit loads need to communicate, the network can be expanded across parallel buses using DMX splitters. Network wiring consists of a shielded twisted pair, with a characteristic impedance of 120 ohms, and a termination resistor at the end of the cable furthest from the controller to absorb signal reflections.
- Expansion: Wireless DMX512 adapters have become popular, especially in architectural lighting installations where cable lengths can be prohibitively long. These networks typically employ a wireless transmitter at the controller, with strategically placed receivers.
In conclusion, DMX lighting is a versatile and widely used standard for controlling lighting and effects in various settings, from stage productions to architectural lighting installations.
