Mystery AD-20 Function

I checked my stash of the non-modular AD20 boards and didn't see any with a green dot. I'm also not aware of another use besides the 691-PCB1-012 with the red dot for a diesel's ditch lights, and the 610-8056-200 with the white dot for the wireless tether and back-up light/coupler.

These non-modular boards were only in use for a limited time -- basically around late 1997 -- before changing to the modular form of the board in 1998.

There is another part number associated with these boards, 610-8232-110, but it references back to the 691-PCB1-012. The 6-18232 Soo Line SD-60 may be the only diesel to use non-modular board, the 610-8232-110 and/or the 691-PCB1-012.

And the two Hudsons from late 1997, the 6-18056 NYC with the Vanderbilt Tender and the 6-18062 Santa Fe Warhorse, were I think the only two that used the non-modular AD20 steam board.

Lastly, I've had a heck of a time getting working non-modular steam AD20 boards from Lionel. Not sure if they were defective or just never programmed (although they did have a white dot) but they were completely DOA, just like your green dot boards.

Sorry I can't help further, but would love an update if you learn the answer.

TRW

I'll keep looking, I was surprised there was a green dot one that doesn't seem to do anything.  The fact that I actually have three of them that all do the same nothing seems to indicate I'm probably not looking in the right place for their function.  I just don't see any activity regardless of what serial commands come in.

I am only aware of the two functions for these boards, the ditch lights for diesels and the tender IR link and light/coupler function for steam.

Maybe that identified unprogramed boards, or defect board. G

@GGG posted:

Maybe that identified unprogramed boards, or defect board. G

Maybe, but these were ordered from Lionel and we not supposed to be defective!

Well, to wrap up this topic.  I actually ordered these to be IR link boards for upgrades using the ERR RS Commander and the IR link.  However, I got the ones with the green dot.  Since that's obviously an error, I explained the colored dots to Lionel since they seemed to ship them interchangeably.  I sent the green dot ones back and got the proper 610-8056-200 white dot boards.