The Modbus standard primarily defines the meaning of various Modbus commands, the addressing scheme used to place data within devices, and the formatting of the data.

The Modbus Organization is a group of independent users and suppliers of automation devices that seeks to drive the adoption of the Modbus communication protocol suite and the evolution …

The Modbus Organization is a group of independent users and suppliers of automation devices. We seek to drive the adoption of the Modbus communication protocol suite and the evolution …

The Modbus/TCP Security protocol is a security focused variant of the Mobdbus/TCP protocol utilizing Transport Layer Security (TLS). IANA has assigned the Modbus/TCP Security …

MODBUS is an application layer messaging protocol, positioned at level 7 of the OSI model, which provides client/server communication between devices connected on different types of …

Specifications and Implementation Guides Please review the license agreement before downloading any Modbus protocol or related documents.

MODBUS Protocol is a messaging structure developed by Modicon in 1979, used to establish client-server communication between intelligent devices.

Network owners can now deploy Modbus TCP/IP throughout the entire network infrastructure, or where desired while keeping reliability and security of existing serial devices intact.

For local or remote I/O expansion, the Relio R9 connects to Sealevel SeaI/O modules via the dedicated RS-485 expansion port and communicates via RS-485 Modbus RTU.