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:/p>

A general description document here
Download area - many documents listed here.

Modbus

From the modbus.org website:

The old 1996 specification and application notes "PI-MBUS-300 Rev. J" here
or the current specification V1.1b3 here.

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