Using Dynex DX-UBDB9 USB-Serial Adapter With Mac OS X 10.6.X
Had to do some digging, but the driver needed is located here:
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Jul 26 2011, 11:43 AMMichael Newton responded:For those who don't like downloading strange disk images onto their systems, the driver needed is for a Prolific PL-2303 chipset. You can get a copy rather easily from Dynex's website but it's quite out of date.
The latest download from the manufacturer (currently version 1.4) is available here: http://www.prolific.com.tw/eng/downloads.asp?ID=31
There's also a project on Sourceforge that seems fairly current as well: http://osx-pl2303.sourceforge.net/