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Modbus TCP/IP has a unit identifier instead address field for Modbus devices which means that the original device address is not needed as the Ethernet devices already contains their own unique MAC addresses. In Modbus TCP/IP error checking field also known as checksum(LRC or CRC) is not considered, as the standard Ethernet TCP/IP link layer checksum methods instead used to guaranty data integrity. #MODBUS SERVER TCP SERIAL MOXA CODE#The function code and their functions are defined below:- Sr No. The PDU includes the function code of 1 byte and the data with no fix size. Thus, MBAP and PDU merges to form a Modbus TCP/IP Application Data Unit shown in the figure below.įirst 4 is Part of MBAP(Modbus Application Protocol) and Remaining 2 is Part of PDU(Protocol data Unit) Transaction/invocation Identifier The unit ID is set to 00 or FFin most of the typical Modbus TCP/IP server application, ignored by the server, and simply echoed back in the response.
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