Wireshark-bugs: [Wireshark-bugs] [Bug 7902] Improved Dissection of Modbus/TCP messages and added
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From: bugzilla-daemon@xxxxxxxxxxxxx
Date: Fri, 26 Oct 2012 09:03:39 -0700 (PDT)
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=7902

--- Comment #33 from Michael Mann <mmann78@xxxxxxxxxxxx> 2012-10-26 09:03:39 PDT ---
(In reply to comment #32)
> (In reply to comment #31)
> > Comment on attachment 9412 [details]
> > Modbus RTU (Serial) for use with User_DLT Dissector ("Modicon Float" data
> > types)
>
> As far as the CRCs go, I assume you speaking of the CRCs for the Modbus RTU
> packets?  They all checked out as valid on my test equipment/software (from a
> variety of manufacturers) and they are reported valid by the CRC-16 "Modbus"
> algorithm as found on this web site (albeit, displayed in reverse byte order):
> http://www.lammertbies.nl/comm/info/crc-calculation.html
> Chris

Packet/Frame 2 shows a CRC of 0xB079.  For that packet, the website shows a CRC
of 0x8F3B which agrees with my current CRC calculations (assuming correct
endianness).  What am I missing?

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