OBD-II commands/replies

**dhendrix11** · 03-21-2004, 01:09 AM

I'm pretty new to this whole forum, so bear with me. From what I have gathered, it looks like to read ODB-II info from your car, its basically just reading/writing serial data on your PC through one of the many available OBD-II to serial cables/boxes. Where can you find a list of the commands if you wanted to write your own software? Any info is appreciated!

**bambooracer** · 03-21-2004, 01:58 AM

There isn't a whole lot. Try http://www.scantool.net or http://www.obddiagnostics.com. If you are serious, look at purchasing the related standards from SAE or ISO (they publish a single book with all the related standards named something like "Diagnostics for Lightweight Vehicles").

**esteban2** · 05-16-2005, 06:58 PM

Originally Posted by bambooracer

There isn't a whole lot. Try http://www.scantool.net or http://www.obddiagnostics.com. If you are serious, look at purchasing the related standards from SAE or ISO (they publish a single book with all the related standards named something like "Diagnostics for Lightweight Vehicles").

Hi!!!!

I need your help please!!!!

I am writing code in Visual Basic in order to communicate to the ECU with ELM interface. I don’t know very well how to write and read the commands I have to send/receive to talk to the ECU.

Could you help me please?

I’ll appreciate your help!!!

Regards

e-mail:esteban.trinidad@tigo.net.py
Esteban

**tempgp** · 03-23-2008, 02:40 PM

If you wanna talk to the car you can use this http://lrcommunications.net/software/CommDebugger

If you want to get the voltage of your battery try AT CV (or AT CR) I forgot which one.
If you want to do it in VB you will need to use Serial Port Component... just open the port and send comands and read responses through the buffer

Besides all tha I'm looking for list of all AT command supported by 327 chipsert

**DarquePervert** · 03-23-2008, 03:21 PM

MAn. Way to bump a three year old thread.

**tempgp** · 03-23-2008, 03:23 PM

didnt look at the date :P
i was googling to find AT command for my ELM327 but found this thisn so I posted :P

**Curiosity** · 03-23-2008, 09:34 PM

Every AT command is in the pdf. http://www.elmelectronics.com/DSheets/ELM327DS.pdf

**tempgp** · 03-24-2008, 04:21 PM

oh
I guess i was blind when I was looking through that doc

tnx

**nation05** · 11-27-2008, 02:27 PM

hi i made a program in visual basic to read data from the rs232 , i try a simple comand like AT Z, and it should reply elm327 v1.2a but when a send the string AT Z i dont have a reply can anybody help pleass.

**tempgp** · 11-28-2008, 02:23 PM

Ok
a) do u get reply if you use HyperTerminal?
b) did u test ur app with something else?
c) id your ELM pluged in to the car bus?

You can use our Com Port debuger to see if you ELM works wit the comands u send. if it does then there is a problem with your app
Serial Comm Port Debugger Download Page