What port does Modbus use?

Modbus uses port 502 by default.

Unknown

Modbus

Q: What is Modbus?

Modbus (Modbus) is a Application Layer protocol in the Industrial category. Serial communication protocol developed in 1979 for programmable logic controllers. Uses master/slave architecture with register-based data access. Ubiquitous in SCADA and industrial automation.

Application Layer — Industrial

Protocol Overview

Full Name Modbus

Abbreviation Modbus

OSI Layer Application Layer

Category Industrial

Default Port 502

About Modbus

Serial communication protocol developed in 1979 for programmable logic controllers. Uses master/slave architecture with register-based data access. Ubiquitous in SCADA and industrial automation.

Application Layer Industrial Port 502

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