Changeing projector designation

I am using the UD-3900PDZ to output to three projectors that have specific screen locations. Left/Center/Right. Video elements move from screen to screen.
If I unplug the UD-3900PDZ or power-down the projectors they never seem to come back in the same position.
Assuming the UD-3900PDZ is powered up and plugged into my M2 MacBook pro properly, does it matter what sequence I turn the projectors on in?
I am using Qlab 5 and I have to rebuild the ques every time I power cycle the projectors. Qlab thinks the projectors should still be in the same positions as befor the power cycle.

thanks

Hello,

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Display orientation, and position is managed by the operating system. Apple macOS uses unique display identifiers to restore the display positions on re-connection, this requires each of the displays ( projectors in this case ) to have a unique identifier. It is possible the projects do not have unique identifiers, or they are not properly transmitting their EDID ( Extended Display Identification Data ) to the computer.

Assuming the UD-3900PDZ is powered up and plugged into my M2 MacBook pro properly, does it matter what sequence I turn the projectors on in?

Generally I would recommend powering on all three projectors, then connecting the docking station to the computer, if this doesn’t cause them to identify correctly it may require connecting the docking station to the computer the powering on each projector in the same order ( for example left, then center, then right ), however without a unique identifier macOS may still incorrectly position the displays even if they are powered on in the same order allowing for each display to be detected before moving on to the next display.

If you have access to three HDMI monitors you can try the same setup replacing the projectors with monitors to see if this issue is isolated to the projectors, or if it also affects the monitors on this same computer.

Normally we recommend our docking stations for desktop use cases, for example at the office to add three external displays to a notebook computer, or at home for the same purpose. A single projector shouldn’t be a problem. I do not recommend the docking station for use in installations like digital signage, display walls, art installations etc where direct access to the docking station is limited as USB is not a 100% reliable data connection and may periodically require manually unplug/plug cycling to ensure connectivity. These use cases may require specific AV hardware and software to function reliably and I recommend consulting an AV installer with experience in digital signage.

Please let me know if you have any additional questions, or if there is anything else I can do to help.

Pat
Plugable Technology
support@plugable.com