Specifications

Table Of Contents
~JN
Head Test Fatal
Description: The ~JN command resets the printhead element error override, acting
as a toggle for ~JO. If the Head Test Fatal option is activated, it will cause the printer
to halt when a head test failure is encountered.
Format: ~JN
~JO
Head Test Non-fatal
Description: The ~JO command is the default printhead test condition and overrides
a failure of printhead element status check. This state is changed when the printer
receives a ~JN (Head Test Fatal) command. The printhead test will not produce an
error if the ~JO default is active.
Format: ~JO
ZPL II Programming Guide Volume One: Command Reference for X.10
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