The system has 3x SmartSolar RS450/200 side by side with CAN daisy chained then about 6m of cable to Cerbo. Terminators on both ends.
The _middle_ RS450/200 throws a little flurry of Error #67 for one or two seconds each (maybe half a dozen a day). Then everything works fine.
Cabling has been checked, connections plugged and unplugged (because RJ45s :-/ )
Not really sure what to try next - the customer doesn't want the errors and the system didn't always throw them. Not sure what changed - other than the system, which has several Quattros, is now in active use (so ambient electrical noise has increased). I know noise/reflection issues can be weird.
Going to try no termination, just one end etc. Contemplated split-terminations (with a capacitor in the middle) in case it's a particular noise sensitivity issue.
Suggestions?