This is the quote I read on Data on a cat5 line
{You can only run data from 1 output on 1 wire. Data, unlike power and ground, is single path. You cannot run the same data on two wires, the signal cannot be split and put back together. Just wanted to clarify. Depending on how you run your display you can realistically run up to 4 controller outputs on 1 cat5 wire since there are 4 pairs (need the ground wrap around data to get the distance}
Can anyone say if this is true or not