You need to install the Windows device driver first if that is not done yet. Use the CD that come with the logger-device or visit the web-pages:
BT747 should be able to run on 64 bit windows when using the new RXTX version.
This has been included in the latest uploads of BT747 in the developement section on the sourceforge site but the correct scripting has yet to be confirmed.
As on all platforms, the following steps are needed:
In more detail, it goes like this: