Quote Originally Posted by oslinux View Post
Ok, but they are simple pics from microchip, right?
so there's a way to code a software for a pic to do that...
True they are just pics with code. You're welcome to spend the hundreds of dollars to buy the SAE standards, and then hours and hours creating code. I can say from personal expirence its a major task. I found that spending $14 on a device the handles all the communications was money well spent. Plus by changing Elm chips I can "talk" to different cars without rewriting my code.

with that chip i can use all of the function of OBD?
Depends what you mean. The product was designed to be an ODBII diagnostics tool. With the chip you will get all the normal engine data and diagnostic codes. The following site has some more information about the chip plus some free software and schematics. http://scantool.net/

i can use the normal software for linux or windows that works with the serial obd?
Not sure what you mean. If you're asking if you can tie your computer directly to the OBD buss the answer is no. There are currently 4 OBDII communications protocols all with very different communications methods but none are RS232 or TTL.