• Drivers Installer for Windows (XP, Vista, 7 and 8)
  USB Drivers are required to use XCTU with the XBIB-U (USB) interface board and the PKG-U Modems and Adapters.
• Linux and Mac OS X Drivers (provided by FTDI)
  The USB interface boards Digi provides use FTDI chip drivers. Linux and Mac users are advised to download drivers directly from FTDI
  
  Note: Legacy drivers and installation instructions can be found here.