A community for the Modbus communications protocol - data communication between devices over TCP/IP and over serial line – open and royalty-free since 1979. Visit Modbus.org to …

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.

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.