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>> Download 5991-4166EN Characterizing CAN Bus Arbitration - Application note c20140924 [8] documenatation <<Text preview - extract from the documentKeysight Technologies
Characterizing CAN Bus Arbitration
Using InfiniiVision 4000/6000 X-Series Oscilloscope
Application Note
Introduction
The differential CAN bus, which is used extensively in automobiles for drive-train and body control, is
based on asynchronous transmission of packets of data from multiple nodes in the system. The CAN
bus is also used in many non-automotive applications including control of industrial machinery, as
well as medical equipment. Because of the asynchronous nature of packet transmission, there are
often collisions of data when two or more nodes begin transmission at the same time... or nearly
same time. When collisions occur, although there is a non-destructive bit-wise arbitration process
that determines which CAN message has the highest priority to continue data transmission,
transmission of lower priority messages can be delayed. In addition, CAN bus error rates can
theoretically increase based on the level of bus load and number nodes in the system. This
directly affects the frequency-of-occurrence of data collisions. This application note will review
the CAN non-destructive bit-wise arbitration process, and will use the InfiniiVision 4000 and
6000 X-Series oscilloscopes to show examples of the following:
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