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How to Build a Maker Modbus TCP Server with WIZnet W5500 on STM32F4?

This article explains a firmware-oriented Maker project based on STM32F4, WIZnet W5500, TCP server operation, and standard Modbus communication.

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Published July 03, 2026

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Original author: bond007Original source (new tab)

How to Build a Maker Modbus TCP Server with WIZnet W5500 on STM32F4?

Project description

1. Title How to Build a Maker Modbus TCP Server with WIZnet W5500 on STM32F4? 2. Summary This article explains a firmware-oriented Maker project based on STM32F4, WIZnet W5500, TCP server operation, and standard Modbus communication. The GitCode project is described as a resource package for bringing up STM32F4 + W5500 TCP server communication with standard Modbus, intended to help a microcontroller communicate stably with a Modbus client over Ethernet. In this architecture, the STM32F4 runs the application firmware and Modbus logic, while the W5500 provides the wired Ethernet interface…

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