I already had software lined up to put the ELM327 OBD adaptor through its paces. It would of bothered me if it had no disc.
If you don't know which communication protocol is used by the ECU of the vehicle it's advisable to leave it in automatic mode.
ELM327 USB version - To do this we will set the type of interface 'Serial (RS232 or Virtual COM Port Driver), leaving the port in autodetect mode.