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AN07-00180-3E
4.
High-speed version and low-speed version
There are two CAN specifications with different communication speeds. One of them is
High-speed-CAN. High-speed-CAN is standardized as ISO11898 and its maximum and
minimum communication speeds are 1 Mbits/sec and 125 kbits/sec. The other is
Low-speed-CAN.
Low-speed-CAN is standardized as ISO11519 and its maximum
communication rate is 125 kbits/sec. The communication speeds currently popular are, in order
of rates, 500 kbits/sec, 250 kbits/sec, 125 kbits/sec, 83.3 kbits/sec, 33.3 kbits/sec and so forth.
5.
5.2
Node control with error counters against errors
CAN supports five types of error detection. Each node has error counters. If an error occurs,
either counter is increased by a specified count. On the contrary, when communication is
successful, the counter is decreased by a specified constant. The communication status of each
node is determined by the values of the error counters. This mechanism serves to limit
communication by node.
CAN specifications
This section provides brief descriptions of the CAN specifications.
For more information about the specifications, access the web site of the CAN promoting organization
CiA (CAN in Automation) ( http://www.can-cia.org/ ) and make a registration; you can get the
specifications.
5.2.1
CAN frame configurations
This section describes frames that are the fundamental communication unit of CAN.
CAN provides four types of frames, which are respectively named the data frame, remote frame, error
frame, and overload frame as shown in “ Figure 5-3 CAN frame configurations ”.
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