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STM32+W5500 for Modbus RTU and Modbus TCP conversion

STM32+W5500 for Modbus RTU and Modbus TCP conversion

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Published December 12, 2025 · © Apache License 2.0 (Apache-2.0)

Original author: 玩转以太网 · ChinaOriginal source (new tab)

STM32+W5500 for Modbus RTU and Modbus TCP conversion

Project description

1. Introduction Modbus RTU Based on serial communication (such as RS-485), it uses a master-slave query-response mode. Data is transmitted in binary format, with each byte containing 1 start bit, 8 data bits, 1 parity bit (optional), and 1 stop bit. There is no fixed frame header/tail; frame boundaries are distinguished by time intervals (typically 3.5 character times). Its advantages are low hardware cost and strong anti-interference capabilities, making it suitable for short-distance, low-speed scenarios (such as sensor networks), but strict timing control is required when there are…

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