This Application Note provides some tips on testing your OBD Interfaces before connecting them to a vehicle. It’s a collection of some of the more common issues that we’ve been asked about over the years, with an emphasis on testing the CAN protocols. If you are building your own circuits, you will likely find this note to be helpful.
Visit our Application Notes page to download this Note.
We’ve taken some recent comments and used them to improve the data sheet for the ELM415 Up/Down Interface IC. There’s more information, and (hopefully) some clearer explanations.
The ELM328 IC has been updated to support all of the ELM327 v1.4 AT Commands. You still can not send any OBD commands with it, but we have changed the responses when you try (it now acts as if there is no ECU connected).
Note – This IC is only for developers that need to try the @2 and @3 commands multiple times with their software. It is not for use in scan tools.
We didn’t think that changes from a few years ago would be of much interest, so removed them.