NetAlert NetMeter User Manual page 7

Bus Errors
Thresholds:
Error Rate High Fault
Error Rate High Warn
What do to when you see
! Press
higher error rates than other nodes. Calculate
the ratio of error rate to frame rate of suspect
nodes and check for above average ratios.
Devices with above average error ratios should
be investigated further.
! Check the other measurements and investigate
the suspect device(s) for faults consistent with
the observed symptoms.
Some techniques you can use are:
!
Replace the device and/or cabling
!
Temporarily remove the device from the
network to see of the errors cease.
!
If you suspect an intermittent cable or
connector, shake, bend or twist the suspected
cable and/or connector while watching the error
rate for changes (up or down).
A node set to the wrong baudrate causes bus errors
(affecting other nodes) when it attempts to go online.
Excessive cable lengths and faulty nodes can
cause errors in the transmissions of some/all
other nodes. Do not assume that the node(s) with
the highest error rate is faulty.
or to identify the device(s) with
15 /s
1 /s
or :
Bus Errors deal with
these two wires
(CANL & CANH)
2
7