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Try USB via ethernet.
Here at work, part of our control system runs 200m via fibre. Ie the computer is 200m away from the desk. The connection is done via fibre optic ethernet and a simply USB converter at each end. Happily runs USB2.0 with a Canon 40D + keyboard + mouse + WD 750GB local drive + several memory sticks with no reliability issues. Been operating since 2009 when it was first commissioned.
You probably don't need this level of hardware but USB over ethernet is a viable alternative and commonly used in heavy industry to overcome limits of length and keep computers in proper air conditioned areas and secured (eg power generation).
Cheers,
Darrin...
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