Thank you very much for the reply!

for 2:Its possible that my fixture will work with commercial desks too?
for 4: i dont want to design that way but can happen if i switch the DIP switches to start from Ch13. Whats happening then?
for 5: could you send me some example schematics(i dont want to do meaningless connections)
Its possible to use 1:1 transformer for the Transceiver part to have separate groung?
for 6: what devices are dual processor devices?