ReadInputRegisters(client, slave_address, address, quantity) ReadHoldingRegisters(client, slave_address, address, quantity) ReadDiscreteInputs(client, slave_address, address, quantity) ReadCoils(client, slave_address, address, quantity) The Arduino Modbus TCP/IP Library contains the functions to read and write slave values: This Arduino Modbus TCP library is only available for Industrial Shields' industrial PLC, but they can be modified by any user, so they can be used in other Arduino devices.
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