What files are mandatory to connect to ECM?

**camaro1995** · 09-30-2022

Works with 2 transistor cable to com port and $88.adx.

**In-Tech** · 10-01-2022

Originally Posted by camaro1995

Works with 2 transistor cable to com port and $88.adx.

That's really cool, I never tried 8192 with the npn's. I always assumed they wouldn't be fast enough. Post the part number and brand of the npn's if you can

**NomakeWan** · 10-01-2022

8192 is a pretty darn slow data rate all things considered. My Arduino with zero additional hardware was orders of magnitude faster than the 8192 baud ALDL, to the point where I had to actually comment delays into the code in order to slow it down enough not to trample all over the data bus when responding to messages.

So I'm not surprised a run of the mill NPN is sufficient. Still, very cool seeing homebrew cables working out!

**camaro1995** · 10-01-2022

They are 2n2222a in TO-18 package. Will look if I can see brand name on them when I get home...
This is the schematic I had used
aldltopc2.jpg

**In-Tech** · 10-01-2022

Nice, shoot, I think I still have my original that I built in the early 90's somewhere, I put all the crapola inside the db9 shell. If I can find it I'll see what I did. Seems like I used the dtr pin and am sure I had no external power. Shortly after I built that, I moved on to a max233 and 7407 inverter to "clean" the signals further. That design has worked on every baud rate I have come across, even besides the gm stuff. I'll see if I can post a pic of my "retired" stuff if I can find it :)