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Modbus Interface 4-6
© 2012 HMS Industrial Networks AB
Doc.Id. HMSI-168-25
J1939 Fault Register
The J1939 fault register is a bit string that indicates the faults that have been
detected in the J1939 network interface.
Bit
Description
0
The address claim has failed. The JMI was unable to claim a unique
J1939 network address and join network activity.
1
The CAN error counter has exceeded its warning limits at least one time
since bootup or the last fault reset.
2
The CAN controller has reported a bus-off condition at least one time
since bootup or the last fault reset.
3
A CAN receive overrun condition was detected at least one time since
bootup or the last fault reset.
4
A J1939 transport protocol error has occurred at least one time since
bootup or the last fault reset.
5
A receive message queue has overflowed at least one time since bootup
or the last fault reset.
6
A transmit message queue has overflowed at least one time since
bootup or the last fault reset.
7-15 Not used.
Table 4-6 J1939 Fault Register Bit Definitions