John Deere Model X485 Lawn and Garden Tractor Parts John Deere Model X485 Lawn and Garden Tractor Parts - The 13-digit product identification number (serial number) (A) is located on the right-hand side frame, just below engine compartment[PDF] RS-485 Wiring Guide - go4b greater than, 10Mbps. RS-485 is designed to transmit this information over significant lengths, and 1000 meters are well within its capability. The distance and the data rate with which RS-485 can be successfully used depend a great deal on the wiring of the system. Wire. RS-485 is designed to be a balanced system. John Deere Wiring - YouTube Sep 11, 2016I made sure that every wire was clean making a good connection at the connector. Every place there was a ground wire it was taken off and cleaned and replaced. John Deere X485 - Discussion Forums - Yesterday's Tractors Jul 20, 2016Anyway, I studied the wiring diagram in the technical manual to find the switch that controlled this and rewired it so it was permanently bypassed. I don't have a manual/wiring diagram for the X485 so I have no idea as to how it would work on your mower. The switch on mine was on the reverse pedal linkage if I remember correctly.