https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=7902
--- Comment #32 from Chris Bontje <cbontje@xxxxxxxxx> 2012-10-26 08:18:00 PDT ---
(In reply to comment #31)
> Comment on attachment 9412 [details]
> Modbus RTU (Serial) for use with User_DLT Dissector ("Modicon Float" data
> types)
>
> Chris,
>
> The CRCs for these packets don't seem to match the CRC algorithm for Modbus
> (per Modbus.org). Is that intentional?
Glad to see part of the patch made it in! Agreed, it was getting large and a
little difficult to manage!
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
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