As Black94Snake mentioned, the OpenPort 2.0 has a micro SD slot for standalone logging. I created an online tool that will take a RomRaider profile.xml file and generate the required logcfg.txt from it. It makes it really easy to take your RomRaider profiles and create a config for standalone logging without having to match addresses from the definitions yourself. It also supports calculated parameters. I built it for myself, but figured I would polish it up and put it out there in case it would be useful for anyone else.
If it gains enough traction (or upon recommendation) I can create a separate post, but I thought it related pretty well to this FAQ. To learn more about what you need to do to get your Tactrix configured for standalone logging, visit: http://forums.openecu.org/viewtopic.php?f=57&t=4319