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We have a Ethercat master wrapped in ros HERE. I think TUe wrote a driver for the beckhoff RS485 interface. It will also become available in SOEM. Further more you can have a look at the FTDI interface modules. They just require a driver that opens the device node in linux. It depends which type of functionality you wish of the RS485 interface. Personally I connect ROS to DMX (RS485 specific implementation for lighting) over a embedded controller.