Paxar Monarch 9855 Operator's Handbook Manual page 80

The RFID printer pauses while programming
the RFID tag.
If the RFID tag is not programmable for any reason, the label may
print with an overstrike pattern, indicating that it should not be
used. Your System Administrator should set the desired Error
Action accordingly.
When printing on non-RFID supplies, you may also see a label
with an overstrike pattern. Do not use that label. When using
"overstrike" as the Error Action, the format prints on the non-RFID
label, but there is no format printed on the RFID label.
RFID Ovestrike Non-RFID Overstrike (verifier error)
If the printer will be unused for extended
periods of time, we recommend leaving the
printhead unlatched.
8-2 Printing