Conventional RGB/RGBW tape: use a decoder
Analog constant-voltage tape does not understand DMX directly. A DMX decoder receives DMX512 and modulates the DC output channels feeding the tape.
| Tape | Typical controlled channels |
|---|---|
| Single color | 1 |
| RGB | 3 |
| RGBW | 4 |
| RGB+CCT | 5 |
The decoder must match the tape voltage and be rated for both total current and per-channel current.
Addressable tape: use a pixel controller
WS2811, WS2812B, WS2815, SK6812, APA102 and similar products use pixel protocols rather than separate PWM power channels for every color across the whole strip. A compatible pixel controller receives lighting data and generates the timing/data format required by the tape.
Professional pixel controllers commonly accept Art-Net or sACN over Ethernet. ENTTEC, for example, documents controllers that map Art-Net/sACN universes to supported pixel protocols and allow pixel grouping, color order, and universe assignment.
How many DMX channels do pixels need?
At 8-bit control:
- RGB pixel = 3 channels.
- RGBW pixel = 4 channels.
A DMX universe contains 512 slots. Therefore a universe can carry up to 170 complete RGB pixels (510 channels) or 128 RGBW pixels (512 channels), assuming one DMX channel per color and no extra control parameters.
What if the tape groups LEDs?
If three physical LEDs share one WS2811 driver, they behave as one RGB pixel in the control data. Enter the physical LED density and the number of LEDs per IC/group in the calculator to estimate the number of controllable pixel groups.
DMX512 vs sACN vs Art-Net
DMX512 is the familiar serial lighting-control link. Art-Net and sACN carry DMX-style universe data over Ethernet, making them practical for projects that need many universes or distributed controllers.
A common signal chain is:
Console / software → Ethernet (sACN or Art-Net) → Pixel controller → Pixel data → LED tapeFor analog tape, the last stage is usually a DMX or network-connected constant-voltage decoder instead of a pixel controller.
Plan universes before installation
Pixel projects can consume universes quickly. A 1,000-pixel RGB installation requires 3,000 control channels, or at least six DMX universes. Controller port limits, maximum pixels per port, refresh rate, network traffic, and data-cable distance all become part of the design.
Keep raw pixel data runs short
Many pixel protocols are timing-sensitive and are not intended to travel hundreds of feet directly from a controller to the first pixel. For large projects, use a system designed to transport control data over Ethernet or another robust long-distance link and regenerate the pixel protocol near the tape.
Run the numbers for your project
Use the free calculator to estimate connected load, power-supply size, feeder voltage drop, power injection, controller channels, and addressable pixel groups.
Open LED Tape CalculatorRelated guides
Sources & further reading
- ENTTEC ELM manual — LED controllers and Art-Net/sACN signal flow
- ENTTEC Pixelator Mini Mk2 manual — universes, pixel grouping and sACN/Art-Net
- ENTTEC — Art-Net vs sACN
Planning disclaimer
This guide is for project planning and education. Verify calculations against the exact tape, power supply, controller, conductor, connectors, and manufacturer instructions. Final installation must comply with applicable electrical requirements.