DMX512 RGBW Lighting Control

How a DMX Console communicates with RGBW Luminaires via daisy-chained serial data

DMX CONSOLE 512 Channels / Universe R G B W DMX OUT 120Ω TERM FIXTURE 1 RGBW LED Luminaire CH 1–4 R G B W FIXTURE 2 RGBW LED Luminaire CH 5–8 R G B W DMX512 DATA FRAME BREAK MAB START CH1:255 CH2:255 CH3:255 CH4:255 CH5-8 ... 1 2 3 4 RS-485 • 250 kbps • DAISY CHAIN

Fixture 1 — RGBW DMX 1–4

255
255
255
255
DMX → CH1:255 CH2:255 CH3:255 CH4:255

Fixture 2 — RGBW DMX 5–8

255
255
255
255
DMX → CH5:255 CH6:255 CH7:255 CH8:255

① DMX Console

The console generates a DMX512 data stream — a serial protocol sending 512 channels of data (0–255 per channel) at 250 kbps over an RS-485 differential pair.

② Fixture 1 — Address 1

Set to start address 1, it reads channels 1–4: R, G, B, W. It passes the entire DMX packet downstream to the next fixture.

③ Fixture 2 — Address 5

Set to start address 5, it ignores channels 1–4 and reads only channels 5–8 for its own RGBW values.

④ Line Termination

A 120Ω resistor at the end of the daisy chain prevents signal reflections. The entire universe refreshes ~44 times per second, ensuring flicker-free dimming.