13 Facts About Modbus

Modbus is a data communications protocol originally published by Modicon in 1979 for use with its programmable logic controllers.

Modbus has become a de facto standard communication protocol and is a commonly available means of connecting industrial electronic devices.

Modbus is popular in industrial environments because it is openly published and royalty-free.

Modbus protocol uses character serial communication lines, Ethernet, or the Internet protocol suite as a transport layer.

Development and update of Modbus protocols have been managed by the Modbus Organization since April 2004, when Schneider Electric transferred rights to that organization.

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The Modbus Organization is an association of users and suppliers of Modbus-compliant devices that advocates for the continued use of the technology.

Modbus Organization, Inc is a trade association for the promotion and development of the Modbus protocol.

Versions of the Modbus protocol exist for serial ports, and for Ethernet and other protocols that support the Internet protocol suite.

Many modems and gateways support Modbus, as it is a simple and often-copied protocol.

Modbus command contains the Modbus address of the device it is intended for.

All Modbus commands contain checksum information to allow the recipient to detect transmission errors.

Maximum length of a Modbus PDU is 253, up to 125 registers can be requested at once when using the RTU format, and up to 123 over TCP.

Maximum length of a Modbus PDU is 253, up to 123 registers can be written at once.