text: <s>[INST] Controlling a PowerFlex 755 with serial MODBUS over RS485? Summary: Controlling a PowerFlex 755 with serial MODBUS over RS485? Can I controll a PowerFlex 755 with serial MODBUS over RS485, using the built in DPI port? [/INST] You will most likely have to use the 20-COMM-M Modbus/TCP communication adapter option. http://literature.rockwellautomation.com/idc/groups/literature/documents/um/20comm-um014_-en-p.pdf \\n </s>