User´s Manual - I+ME ACTIA GmbH

Error Interpretation
The status bar of CAT provides in any mode but the Diagnostic Online mode information about the
CAN bus status:
Bus Status:
The Bus Status as provided by the status flag of the CAN chip is displayed.
Rx Errors:
Different to the bus status not the Rx counter as provided by CAN chip is displayed but the real number
of Rx Errors that have occurred on the bus since going online are displayed. Independent of the Error
Type the counter is increased each time by one.
Tx Errors:
Different to the bus status not the Tx counter as provided by the CAN chip is displayed but the real
number of Tx Errors that have occurred on the bus since going online are displayed. Independent of the
Error Type the counter is increased each time by one.
In Offline Mode the Trace List View as shown below provides additionally an interpretation of the
Error Code Capture register of the SJA1000 CAN controller used by CAT.
Accu:
The accumulated numbers of Rx and Tx errors occurred on the bus are displayed. (The same value that
is provided by the status bar.)
Chip:
The Rx and Tx error counter values are displayed, as provided by the CAN chip.
Note: The error counters are modified according to certain rules. So the step size of increasing a
counter allows already an interpretation. Generally the counter increases by 8 if the node probably is
responsible for the error itself. Otherwise it is increased by 1.
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