I'm hooked up the same way, 24/7 to car-pc. You just have the right angle cord going from the car's connection, to the unit itself, use zip-ties to secure the unit into the console cabling somewhere, then run the usb line to the car-pc, done. Just realize when purchasing some of these units will be powered 24/7 if left connected, if you don't want that minor draw, as it can add up fast, read the documentation for it to make sure it won't draw power from the ODB-II connection after the PC is off.
rs-232 = serial port.Originally Posted by gulleyman
I really think you should get one of the largely used and known adapters that have been mentioned rather than some ebay listed knock-off. They have more documented options, the least of which is working in many instances with older vehicles ODB I, and certain other pre-ODBII methods, that and people have reliable experience with these here.
My personal preference if I were to do it over again would be the OBDPro Smart Switch here since it's no longer powered once the PC is shut-down. But I believe the ODBLink is switchable from what to draw from now, can't remember for certain.