ZPL commandsPrinter and media
~JLSet Label Length
Not supported by zplkit yet
Sets the label length by feeding labels until the printer finds it. Run it after changing media.
Format
~JL^JJSet Auxiliary Port
Configures the auxiliary port that connects an applicator or other external device.
^JMSet Dots per Millimeter
Sets print density: ^JMA is full density, and ^JMB halves it (8 dots/mm becomes 4, for example), doubling the size of everything on the label, ^FO positions included. Place it before the first ^FS in the format, and the setting stays in effect.