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How to Build a Modbus TCP Slave with WIZnet W5500 on AI8051U?

This AI8051U commercial embedded project uses WIZnet W5500 to implement a Modbus TCP slave over wired Ethernet.

gavinchang

Published May 16, 2026

Original author: 单片有机机Original source (new tab)

How to Build a Modbus TCP Slave with WIZnet W5500 on AI8051U?

Project description

How to Build a Modbus TCP Slave with WIZnet W5500 on AI8051U? Summary This AI8051U commercial embedded project uses WIZnet W5500 to implement a Modbus TCP slave over wired Ethernet. The AI8051U firmware controls W5500 through SPI, while W5500 provides the Ethernet MAC/PHY, hardware TCP/IP stack, TCP socket transport, and packet buffering needed for a Modbus TCP client to read and write device registers. The public CSDN page confirms the project goal is to understand Modbus TCP, learn a Modbus TCP slave driver, and test with Modbus Poll. What the Project Does The project implements a Modbus…

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