Esp32 -S3 Ethernet W5500 Modbus TCP Connect to Modbus Poll

gunn

Published December 11, 2025

100 UCC

6 VAR

Original author: Deny Tech · IndonesiaOriginal source (new tab)

Components

Hardware components

WIZnet - W5500

x 1

Espressif - ESP32S

x 1

Software Apps and online services

Witte Software - Modbus Poll

x 1

WIZnet parts

W5500 Datasheet

Project description

Modbus TCP Communication Using the ESP32 S3 and W5500 1. Project Overview and Environment Setup This project aims to implement Modbus TCP communication using the ESP32 S3 microcontroller and the W5500 Ethernet module. The primary hardware used is the ESP32 S3 and W5500 modules. An example using a router is provided for wiring configuration. 2. Hardware Connection and Library Configuration 2.1. ESP32 S3 GPIO Pin Configuration The pin configuration for SPI communication on the ESP32 S3 is as follows: The MOSI pin is connected to GPIO 36. The MISO pin is connected to GPIO 35. The SCK pin is…

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