ENTTEC Open DMX USB

Distinguish operating-system detection from program access.

1. Close other lighting applications: only one program can access the interface at a time. Reconnect during a controlled test, away from an active show.
2. Check whether the operating system detects USB. Windows may list USB Serial Converter or USB Serial Device; it does not need to show a fixture name.
3. Try another port and a USB cable shorter than 1 m. If the system sees it but the application does not, check compatibility and that software’s platform-specific driver guide before changing drivers.

USB detection does not automatically enable a universe. The following steps refer to QLC+4; check the controls for your version if you use another application or edition.

1. Check Output and the assigned universe in Inputs/Outputs. Do not select Pro mode or an RX input.
2. Check fixture DMX address and mode, power, cabling and line termination. A fixture may need dimmer and shutter as well as color channels.
3. Test Simple Desk with a single known fixture. The interface transports channels; do not add its model to the patch as a fixture.

Timing depends on the computer; the DMX line can also cause this symptom.

1. Save the project and compare a simple scene without competing applications or heavy tasks. Record version, load and when flicker occurs.
2. Check cables and test a short known line. If the QLC+ version allows output-frequency adjustment, try gradual reductions and check fixture response.
3. Record the tested frequency and fixture response in your system before adopting a setting suggested by someone else. If the issue persists, discuss an interface with onboard processing and isolation with the responsible technician.

Open DMX USB needs the computer to remain running and does not play a show by itself. When comparing alternatives, distinguish an internal buffer from standalone playback: ENTTEC lists DMX USB Pro as buffered, but it does not offer standalone playback either.

1. For laptop operation, check the application, operating system and versions using the actual scenes. We can assess the planned system or compare an interface with documented onboard processing and isolation. For each option, verify the chosen software and prepare and rehearse backup separately.
2. To run the performance without a computer, request verification of a controller with documented standalone playback and its preparation and triggering method. Tell us whether you need live changes, recorded songs, or fixed scenes. Model, availability, programming, and operation are quoted according to the agreed scope.

The interface is only one part: computer, compatible application, output, cables, and fixtures must form a testable route. USB detection does not establish a prepared show.

1. Send the date, venue, visual goal, approximate dimensions, and setup, rehearsal, and performance times. Include operating system and application versions, known fixtures and modes, and what your production supplies. Connection photos and a provisional inventory are enough to start; flag cameras, outdoor use, or venue restrictions where relevant.
2. We can assess equipment only, project preparation and testing, or operation during the performance. To prepare the proposal, we establish who supplies the computer, licenses, profiles, cables and accessories; who programs and triggers scenes; and how the show will recover after an interruption. The proposal will describe those items and tasks, along with anything still to be confirmed.

Before programming, decide whether you need changes triggered by a person or a sequence linked to playback. That choice determines how the control system and its cues are prepared; the USB interface carries the DMX output.

1. For entrances, pauses and endings, we can assess scenes triggered by an operator following cues. For a show with prepared songs, we can assess a trigger path between playback and lighting control, checking software, versions and licenses before proposing it. Preparation should include rehearsing the triggers and the lights’ response.
2. Send the song order, who runs playback, and what happens when a song is paused, skipped, or repeated. Identify which changes need precision and the intended recovery scene. Preparation, audio/video coordination, rehearsal, and operation should be explicitly addressed in the quoted scope.