Solution:

485DRCi switch settings 2 wire no termination 5---OFF 6---ON 7---Off 4 wire no termination 5---OFF 6---ON 7---ON If you are using termination resistor (which is not recommended unless you are going long distances at high baud rate) 2 wire with termination 5---ON 6---ON 7---Off 4 wire with termination 5---ON 6---ON 7---ON