rs485 one way
I have an application where one-way data has to be transmited over wires at about 1Mbps to a distance of about 100meters. The cost of transceivers must be very low. I have successfully used simplex Rs-485 (Rs-422) except of one Problem. Sometimes, as the receiver and transmitters are powered bu different mains sources, the RS-485 drivers get blown up. I want to have some isolation in the circuit without increasing the cost too much.
Is it possible to use some pulse transformers with RS-422 like in Ethernet to isolate the transmitter and receiver circuits.