Profibus and Modbus

I receive many requests for details of the Profibus and Modbus protocols. Before you ask for more information, please look carefully at the material listed here.

If these don't help, by all means try my HART Discussion Forum / Message Board. But, especially for Profibus, you may do better elsewhere.

Profibus

From the Profibus International website:

Short brochure (6 pages) in English und Deutsch.
Technology and Application- System Description (42 pages) in English and many other languages.
Technology Description as a single long web page.
Download area - many more documents listed here.
Literature list and order form here.
Web-based training (very very slow!) in English und Deutsch.
Frequently Asked Questions.

Modbus

The 1996 specification and application notes "PI-MBUS-300 Rev. J"

online from Telemecanique's Modicon website
or as a PDF document.

An updated "Protocol Specification V1.1b", and a new "Serial Line Protocol and Implementation Guide V1.02" is accessible here, from the Modbus-IDA organisation. (Also an implementation guide for Modbus TCP/IP.)

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