title: How to interface with obd ii elm327?
body: <p>Do I have to purchase <a href="http://standards.sae.org/j1939_201206/" rel="nofollow">this</a> in order to get all the PIDs and the full instruction set for communicating with the car's obd ii interface via an ELM327? I tried looking for some kind of api for the ELM327 connector, but couldn't find any documentation besides the actual chip's schematics. </p>
  
  <p>The standards linked above seem to provide the instruction set for all current obd2 protocols, can anyone confirm this?</p>