Perhaps I should have said ‘include’ rather than ‘exclude’, since you’ve misunderstood my logic. I would have answered ‘no’ (it doesn’t have one) and therefore physical /dev/ttyS* devices would be excluded from the search, solving my problem.
I’m not aware of any laser we support that uses a real serial port instead of a USB virtual serial port, so I suspect excluding /dev/ttyS* would be safe anyway.
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@space.dandy - ok, download, extract, and try this one on for size:
https://drive.google.com/file/d/1VOs7rRV1rudReIesxggZvRM-vl-dentg/view?usp=sharing
But first, create the file ~/.config/LightBurn/PortExclude.txt
And add the line ttyS0 to it.
I didn’t want to go too overboard so there’s no wildcard matching or anything. It must be name exactly as it shows up in the dropdown in LightBurn. You do not need the full path, and it’s case-sensitive, of course.
Then launch LightBurn from what you extracted. That new version should now exclude ttyS0 so that when you don’t have a laser connected it doesn’t try to connect to that.
Let me know how that works for you 
Yes, that has worked fine, thank you. 
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