exactly right. if there ain't no port, there ain't no loggin! eventually (maybe) i'll add logic to detect the usb events of physically plugging/unplugging the cable. until then, plug it in first and make sure your pc/laptop knows its out there.
currently i only have it set up to recognize a roving networks bluetooth module or an ftdi usb/rs232 device. i'll add the standard rs232 serial cable/generic usb converter routines soon, as well as fixing a few bugs and adding some other features that were in the old version i still haven't gotten around to yet.
i've only tested it using my smecstim. i'll be curious to see what the logging speed will be on an actual vehicle and if there is any difference.