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The only OBD device I have used on my car was the ELM323 connected to a computer and it worked with no problems.
I hope to do some work on it tonight.
So, you were using the Serial Freeduino with the RS232 connector connected directly to the ELM's output. I may have to get a Serial Freeduino to give that a shot if I can't get my Deciema with MAX233 to work.
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