Wireshark-bugs: [Wireshark-bugs] [Bug 10971] CANopen dissector does not support CAN2.0B extended
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From: bugzilla-daemon@xxxxxxxxxxxxx
Date: Fri, 13 Mar 2015 07:45:35 +0000

Comment # 4 on bug 10971 from 
According to http://www.nikhef.nl/pub/departments/ct/po/doc/CANopen30.pdf:

"CMS defines 8 priority levels in its messages,
each having 220 COB-IDs, occupying COB-IDs 1
to 1760; the remaining identifiers (0, 1761-2031)
are reserved for NMT, DBT and LMT. See Table 1.
In a CAN-network the lower the value of the
COB-ID, the higher the priority of the corresponding
message on the network is.
Note that this standard assumes CAN2.0A (CAN
Standard Message Frame) having an 11-bit identifier,
allowing a range of [0, 2047], but which -for
historical reasons- is limited to [0, 2031]. However
using CAN2.0B (CAN Extended Message Frame)
with 29-bit identifier doesn't change the picture: the
11-bits range in the table maps to the 11 most significant
bits of the 29-bits COB-ID and the COBID
ranges in the table will just become (much) larger."

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