Very quick question regarding serial communications. I have several Arduino serial communication TX's (all common ground), linked through a digital switch IC to a single RX on another Arduino processor.
All works fine. I can select the source I want, and it all works as expected.
However, there is a possibility that you could select two of the sources at the same time, and therefore they would be 'mixed' in the switch IC before leaving (it is a basic 4 pole 1 way switch IC).
I totally understand that the serial isn't going to work in any form, but will it cause damage? To my thinking (which may be incorrect), you are not exceeding the levels, just making a mess of them.
Otherwise, I may have to implement some complicated logic to ensure you cannot select more than one source at a time, but I was trying to keep the board as simple as possible.