Female Jack 8P8C RJ45 to 2 Wires RS485 Screw Terminal Blocks
you may choose other options as below:

pin4-A + pin5-B
pin5-A + pin6-B
pin6-A + pin7-B
pin7-A + pin8-B
pin2-A + pin7-B
Pin1-A + pin2-B
pin3-A + pin1-B
pin1-A + pin4-B
( pin3 & pin5 ) -A + ( pin4 & pin6 ) -B
( pin4 & pin5 ) -A + ( pin7 & pin8 ) -B