This document describes the modbus over serial line protocol. Modbus line terminator for end of rs485 line rj45 connector show more characteristics price is list price and may be subject to a trade discount check with your local distributor or retailer for actual price. Modbus Rtu Plcs Net Interactive Q A A Quick Tutorial On Rs485 And Modbus The Main Differences Between Rs 232 Rs 422 And Rs 485 An rs485 modbus must use a balanced pair for d d and a third wire for the commongnd. Modbus 485 end of line resistor . Modbus serial line protocol is a master slave protocol. 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. At each end of the bus you must put a bus te...
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