So, it's NOT just logic states that need to be send, but there are also data bytes that must be decoded by a UART and the data sent to the other side of the wall. Has your study discovered what the maximum number of logic changes that can occur per millisecond on each logic line?
Well that is all you need for full dulpex RS232.
Just connect two Arduinos together.
TX->RX
RX<-TX
Do you plan on making a PCB?
That describes half-duplex. one sends while the other listens.
There is no reason why both can't send and receive at the same time.
Over the same two wires? Need to see a demonstration.
Right, I did assume there was a ground wire.
The RS-232 specs include a secondary tx-rx pair and some modems did support that. The Bell 212 modem. And Data General sold modems that allowed two data paths. Were very useful under certain conditions.
I thought there was a ground. Had to read through the whole topic again
Post #27
RS232, outputting it on 2 wires + ground (3 wires total).
Sure enough, there it is! But I don't expect to read about the OP having such and Arduino project running in our lifetimes.
I think I have a few years left.