If one transmission error occurs in CAN, then how many error counters are added and same for receiving error?

Author: Dr Kaarthick Balakrishnan

Each node maintains two error counters: the Transmit Error Counter and the Receive Error Counter. There are several rules governing how these counters are incremented and/or decremented. In essence, a transmitter detecting a fault increments its Transmit Error Counter faster (usually 8) than the listening nodes will increment their Receive Error Counter. This is because there is a good chance that it is the transmitter who is at fault! When any Error Counter raises over a certain value (usually 128), the node will first become “error passive”, that is, it will not actively destroy the bus traffic when it detects an error, and then “bus off”(usually 255), which means that the node doesn’t participate in the bus traffic at all.

Using the error counters, a CAN node can not only detect faults but also perform error confinement.

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