Hado,
It sounds like you are working with a USB to DMX adapter. I'm not sure
which one you are using but there is an open design that uses the FTDI
USB - Serial chip (FT232BM, or equiv.). As far as I know these devices
work as a serial port from Mac OS X's point of view. The biggest
problem is getting the 250kbs that is needed since it is nonstandard
and gets eaten by the OS along the way. There is a group of people that
are working on a solution and at least one hack as been developed that
works for some. These people are working with the open USB DMX adapter
on the following mailing list:
email@hidden
"Change itself is not painful it is resistance to change that causes
pain."
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