ZPL commandsPrinter and media

^JTHead Test Interval

Not supported by zplkit yet

Sets how often the printer runs its automatic printhead test, counted in labels.

Format

^JT####,a,b,c

Parameter	Description	Default
`####`	Number of labels between head tests0000 to 9999 (0000 turns the test off)	0000 (off)
`a`	Choose the range of elements to test yourselfY or N	N
`b`	First element to test when a is Y0 to 9999	0
`c`	Last element to test when a is Y0 to 9999	9999

~JSChange Backfeed Sequence

Controls when the printer backfeeds labels after tear-off or peel-off, as a percentage before and after printing.

^JUConfiguration Update

Saves the current settings to permanent memory, or reloads saved or factory settings.