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Troubleshooting
Communications Problems
1/13/2016 ZD420 User’s Guide 212485-001 Rev. A
Communications Problems
Table 3 identifies problems with communications, the possible causes, and the recommended
solutions.
Table 3 • Communications Problems
Problem Possible Cause Recommended Solution
A label format was sent
to the printer but was
not recognized. The
DATA light does not
flash.
The communication
parameters are incorrect.
Check the printer driver or software
communications settings (if applicable).
Check the printer’s handshake protocol
and serial port settings. The setting used
must match the one being used by the host
computer. See Serial Interface on page 46
for the printer’s default serial port settings.
The serial cable you are trying to use may
not be a standard DTE or DCE type cable.
See Serial Port Interface - Auto-detecting
DTE and DCE on page 135
A label format was sent
to the printer. Several
labels print, then the
printer skips,
misplaces, misses, or
distorts the image on
the label.
The serial communication
settings are incorrect.
Ensure that the flow control settings match
the host system.
Check the communication cable length.
Check the printer driver or software
communications settings (if applicable).
A label format was sent
to the printer but was
not recognized. The
DATA light flashes but
no printing occurs.
The prefix and delimiter
characters set in the
printer do not match the
ones in the label format.
Verify the ZPL programmings prefix
(COMMAND CHAR) and delimiter
(DELIM./CHAR) characters. Configuration
Setting to Command Cross-reference
on page 146
Incorrect data is being
sent to the printer.
Check the communication settings on the
computer. Ensure that they match the
printer settings.
If the problem continues, check the label
format.
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