obdtester.com ELM-USB specifics

I’ve bought a ELM-USB from obdtester.com. It interfaces the OBC-II bus found in just about all recent cars into a serial port over USB.

Inside the case there are two circuit boards: One marked “Generic OBDII Board” and one marked “FoCOM K-USB ELM-USB”. A pretty (an scaled on the client-side ;)) picture of the parts:

DSCN2815

ICs on the usb board:

  • PIC18F 2455-I/SO, 0823V9Q
  • MCP2515 “second generation stand-alone CAN controller”
  • A82C250 (CAN controller interface)
  • 78L08A 8v voltage regulator
  • 9241A 4x potentiometer

One 160000M crystal.

As found on: http://www.obdtester.com/elm-usb.

The OBC2 interface, or at least the protocol presented by the ELM- USB, seems easy. Slightly Hayes-inspired, start with ATZ and then  01xx\n to read sensor data.

Why? No plan. Just wanted to see what that strange looking port in my car was good for.

This entry was posted in stuff and tagged , , . Bookmark the permalink.

One Response to obdtester.com ELM-USB specifics

  1. Me(au) says:

    What is the serial?

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s