DMX Addressing Guide for Small Rigs

Universes, channels, addresses

One DMX512 universe carries 512 channels. Every fixture occupies a block of consecutive channels starting at its address — a moving head on 17 channels set to address 1 uses channels 1–17, so the next fixture starts at 18.

Two fixtures may share the same address only when you want them to respond identically (audience blinders on opposite sides of the stage are the classic case).

A clean scheme for small rigs

For rigs up to roughly 32 fixtures, one universe is usually enough. Beyond that, or when adding video/media servers, plan for a second universe from the start.

• Group by function, not by brand: all beams first, then washes, then effects. Cues become range-based instead of scattered.
• Leave the last few channels of the universe empty for late additions.
• Use consistent channel modes across the same model — mixing 17 and 25 channel modes on identical wash heads only complicates programming.
• Label addresses on the fixture yoke or base; the next technician will thank you.

Wiring and termination

Daisy-chain fixtures from the console out using quality 3- or 5-pin XLR data cable — never use microphone cable for permanent installs, as its shielding and impedance cause flicker at length.

Termination is not optional on long runs: a 120 Ω terminator on the last fixture prevents signal reflections that show up as random strobing.

Run without a console

Many compact fixtures include sound-activated and auto modes, which let bars and mobile DJs run a rig without any console. Set identical fixtures to the same auto mode and address group, and the rig moves together.

When the show grows a console later, the same addressing scheme carries over unchanged.