Modbus TCP Protocol Explained | MBAP Header, Frame Structure & Practical Example

Published: 09 May 2026
on channel: ControllersTech
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Understand the Modbus TCP protocol and learn how Modbus messages are structured and transmitted over Ethernet using TCP/IP.

In this tutorial, we break down the Modbus TCP frame and explain the ADU, PDU, and 7-byte MBAP header. We go through the Transaction Identifier, Protocol Identifier, Length, and Unit Identifier fields, and understand how each one is used when a Modbus TCP client communicates with a server.

#STM32 #ModbusTCP #LWIP #EmbeddedSystems

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