You need either a Digitrax PR3 or a RR-CirKits Locobuffer-USB to connect your computer to the Zephyr. Also a Loconet cable to connect between the interface and one of the Loconet jacks on the Zephyr.
PR3 can also be a standalone programmer (not connected to the Zephyr), the Locobuffer seems to be less trouble to install for WIndows 7 and 8.
--Randy
Modeling the Reading Railroad in the 1950's
Visit my web site at www.readingeastpenn.com for construction updates, DCC Info, and more.
I have been trying to figure out what I need to use Decoder Pro to program my HO locomotives.I have a Digitrax DCS50 system. I have several locomotives with QSI or MRC sound decoders. I have one Bachmann DCC locomotive with no sound. I also have a computer with Windows 7. What is the best way to interface the computer and a programming track? I have read quite a bit of the JMRI web site but I still not sure what I need.