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					Originally Posted by mcquackers  If that works for you, then do it that way. I connected all four and had zero problems. I am no electrician , so I can't pretend that me doing it my way without frying the board wasn't just pure dumb luck.
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 But I am.  

  For about 60 years now.
Dumb luck plus that warning to not connect both USB and serial at the same time.