The ELM327 is actually a PIC18F248
Ya and there are a few people that even made there own copies of the elm chip, and the elm chip is slow because it converts to ascii etc. etc.
Originally Posted by Lukeyson
Ive read up on it all i just dont get how the obdII works, is it like RS232 with data and stop bits ? Any sample routines on how to send a clear code ?
There are a few protocols encapsulated by OBDII. J1979 lists them.
But SAE J1850, ISO9141, ISO14230 and ISO15765 are your next references. These standards will help you detemine the electrical and signalling definitions for each.
A good description of protocols for iso9141 (OBD11)can be found here