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i'm doing some work with OpenDMX controllers (e.g. see this Entec one, but many versions) and i wanted to control them with processing on windows. i realized that there was no library that worked, so i rolled my own.
you can find the source and the library itself here:
hopefully it's useful to some folks! there was some other DMX stuff on the processing list of contributed libraries, but they don't seem to work with OpenDMX. perhaps we'll get this one listed.