How to change the dpi from 200 to 300 through ZPL?
I want to use the same ZPL code on printers S4M (200 dpi) and ZT230 (300 dpi).
The ^MU command sets the units of measurement the printer uses. ^MU works on a field-by-field basis. Once the mode of units is set, it carries over from field to field until a new mode of units is entered. ^MU also allows for printing at lower resolutions — 600 dpi printers are capable of printing at 300, 200, and 150 dpi; 300 dpi printers are capable of printing at 150 dpi.