It's embarrassing how often the simple act of documenting your problem leads you to find the cause. In this case, I had a variable ($handle) defined both locally and globally - an old, old story. Fixing that did get me past the problem I described above, not surprisingly. Now of course there is another problem, but I'll consider that one myself a little more before asking for help. --- Marais

In reply to Re: Destroying tied serial port by Marais
in thread Destroying tied serial port by Marais

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