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To minimize the reflections from the end of the rs485 cable it is required to place a line termination near each of the 2 ends of the bus modbus specifies that a network not requiring line bias shall use a 120w w resistor between the differential pair. Some devices provide integral termination resistors. Resolved Use Of Analog Switch With Rs485 Transceiver Rs 485 Wikipedia Rs422 Rs485 Bus The termination impedance should be equal to the characteristic impedance of the cable zo and is used only once at the end of the cable. Rs485 resistor termination . Termination should be placed at the end of the network for each wire pair. Because matching termination impedance to zo often is difficult to achieve and is application dependent typically 20 is sufficient. Place a termination resistor matching the cable impedance at a convenient location as close to the end of...