I never knew it wasn't TTL!
See, you learn something new every day.
What rating are the diodes?
Have you got any numbers handy for them? I'm quite keen to try this out
I was referring to the cross through the RX and TX line, I was always taught to stick in a dot where it joins on, and a bridge where it crosses over the top, as the straight cross could be mistaken for either, but I get the point of it
So the Op Amp is only knocking the input and output voltage one way or the other, as close as it can get (0V or 5V)? so a garbage 3.5V signal gets bumped up to 5V and a 0.4 gets knocked down to 0? Is that correct?
Bare with me as I'm still learning!
Does your setup also get better formatting back from the Hex Com tool and others?
I take it it could be adapted to be used for serial as well?
Regards,
Daniel.