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Keysight Technologies
Debug Automotive Designs Faster with
CAN-dbc Symbolic Trigger and Decode
For Keysight InfiniiVision
4000 and 6000 X-Series Oscilloscopes
Application Note
Introduction
The differential Controller Area Network (CAN) bus is used extensively in all of today's automobiles
for drive-train and body control. This protocol was developed by Bosch more than 30 years ago, and
it is still considered the "workhorse" serial control bus of the automobile. The CAN bus has also been
heavily adopted for industrial and medical equipment control applications.
The oscilloscope is the primary measurement tool used today to test and debug the physical layer
of this serial bus. Although CAN bus protocol analyzers, such as Vector's CANanalyzer, are also
commonly used for testing and debugging at a higher-abstraction application level, the advantage of
an oscilloscope is that it provides you with the ability to monitor the analog quality (signal integrity)
of the physical layer of the CAN bus. The electrical environment in automobiles is naturally harsh
with lots of noise and often unexpected transients. The core competence of an oscilloscope is that it
can capture and show you details of those infrequent automotive transients and noise that could be
producing CAN bus errors.
This application note will begin by showing the difference between oscilloscope hexadecimal triggering
and decode versus CAN-dbc symbolic triggering and decode of a CAN differential bus. We will then
provide some background on the core element required to symbolically decode the CAN bus, which
is an industry-standard .dbc file. In addition, we will provide step-by-step instructions on how to
perform CAN symbolic-level triggering and decode using a Keysight Technologies, Inc. 4000 and 6000
X-Series oscilloscope. CAN-dbc symbolic triggering and decode is standard with the DSOX4AUTO
and DSOX6AUTO CAN/LIN options.
03 | Keysight | Debug Automotive Designs Faster with CAN-dbc Symbolic Trigger and Decode