ZPL commandsPrinter and media
~JOHead Test Non-Fatal
Not supported by zplkit yet
Makes the printhead test non-fatal, which is the default. A failed test shows an error and stops printing, but PAUSE continues without a power cycle, unlike with ~JN.
Format
~JO~JNHead Test Fatal
Makes the printhead test fatal. If the test finds a bad element, the printer stops and reports an error.
~JPPause and Cancel Format
Cancels the format being processed and puts the printer in Pause Mode, like pressing CANCEL on the printer. Each further ~JP clears the next format in the buffer.