1. Use shielded cables and standard grounding:
Cable selection: Shielded twisted pair (STP Cat5e/Cat6) is preferred, and the shielding layer needs to be grounded at both ends.
Grounding method: Only keep a single point grounding in the DMX link (usually the controller end) to avoid multi-point grounding to form a loop. If multi-point grounding is required, use an isolated signal converter (such as an optoelectronic isolator).
2. Optimize wiring design:
Keep away from interference sources: Keep the DMX network cable away from the AC power line and frequency conversion equipment, and use vertical routing when crossing.
Shorten the exposed part: Avoid excessive exposure at the connection between the RJ45 and XLR interfaces to reduce the antenna effect.
3. Add signal conditioning equipment:
Isolator (Opto-Splitter): Block the ground loop and isolate the noise transmission.
Terminal resistor: Connect a 120Ω resistor at the end of the link (the last device) to suppress signal reflection.
4. Detection and diagnosis tools:
Oscilloscope/protocol analyzer: observe the signal waveform and check whether there is distortion or noise burrs.
Ground resistance tester: ensure that the ground resistance is ≤1Ω and avoid virtual connection or high impedance grounding.
