Sorry, but
CANBus is the
software/harware "architecture" that OBD-II uses.
http://en.wikipedia.org/wiki/CAN_bus
I believe what you're
actually asking about are the manufacturer's
Parameter ID (PID) codes which identify what packets of data are being transmitted and received over the CANBus protocol:
http://en.wikipedia.org/wiki/OBD-II_PIDs