The error check field provides a methodįor the slave to validate the integrity of the message contents. Theĭata field must contain the information telling the slave which register to Request the slave to read holding registers and respond with their contents. The data bytes contains any additional information that the The function code in the request tells the addressed slave device what kind ofĪction to perform. It is traditionally implemented using RS232, RS422, Since Modbus protocol is just a messaging structure, it is independent of the 'read register' or 'write register'), the data, and a check sum (LRC or CRC). A MODBUS message sentįrom a master to a slave contains the address of the slave, the 'command' (e.g. Master-slave communication between intelligent devices. MODBUS© Protocol is a messaging structure, widely used to establish
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