I already had the USB to ODBII cable as I've been using GuzziDiag for quit a while. I bought the ODBII to Ducati 4 pin cable as it was cheap (~$20 shipped to CA) and downloaded the latest M3C9 version of JPDiag which is supposed to support the Siemans/Conti MC3 ECU.
I setup everything as suggested but have not been able to log into the ECU yet. I keep getting a "can't init ELM" error which suggests it's not talking to the cable properly. I have the com port setting correct and GuzziDiag works with that cable just fine so I know the drivers are OK. My USB to ODBII cable is the exact one they spec on their website.
So...., not sure where the hiccup is but it's not straight forward yet. I've used a variety of ECU programs (GuzziDiag, TuneECU, DealerTool, and Power Commander) so I'm not a newbie at this.
It looks like I'll be buying a Rexxer to get the map plus have service tools as I do all my own work. I wish they had it worked out as good as TuneECU or GuzziDiag, but I fully understand the Gov't regs are making hacking ECUs even harder and most of this stuff is being developed by a few very talented people on their own time.