Compatibility between Modbus revisions

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Thread Starter

Marek Vasko

Dear all,

Is there any compatibility between the revisions of Modicon Modbus Protocols as defined in PI-MBUS-300?

There are the revisions from A to J at this time, but I am wondering about the compatibility between revisions (can I use the device with Rev. D for communication with device running Rev.A?)

Thanks in advance

Mark
 
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Lynn at Alist

Because of their age I doubt you'll get a good answer. Likely 'newer' revs added clarifying points. It's UNLIKELY any specific details or rules CHANGED between revs. A few of the revs are likely just format changes as big corporations struggle to keep documentation looking consistant.

So you're likely Ok - unless the product Rev A and Rev D selected different solutions for an ambigous point clarified in a later revision of the document. Only actual usage will help you see this, but I would doubt you'll notice any problems.

- LynnL, www.digi.com
 
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