gunrunnerjohn posted:I'm curious on the RCDR equipped Legacy if we'll have an issue with the serial data ground not being frame ground. For TMCC and early Legacy with the R4LC, frame ground and DC ground are the same.
I asked the question a while back on the BEMC boards when I installed it in my 3rd Rail loco/updating the Diagrams for BEMC and John Route responded with....
“The Ret is the serial date return reference. It provides the same ground ref as the source of the serial signal. This allows some boards to use 1/2 wave AC (required on receivers) to connect to full wave AC rectification powered PCBs like the BEMC.”
When installing those electronics I ran into a issue where I did not ground out the RET pin on the BEMC board to the frame. This was causing the board to not see the serial data clearly from the RCDR.
Dunno if this would answer your question John....
