Published:
The format draws several boxes or graphics, the printout shows just the final one. Seen most often on mobile units. The reflex is to rearrange the ZPL — but when a renderer draws every shape from the very same file, the file has already been acquitted, and the investigation belongs on the printer's side.
Paste the format into a ZPL preview. If every ^GB renders
and no warnings appear, nothing in the format is being silently dropped by
the interpreter — the same bytes produce different results on screen and on
paper, so the difference lives in the device. That single check saves the
hours usually spent reordering commands that were never the problem.
Mobile printers commonly ship interpreting a different page language by default, with ZPL handled by an emulation layer whose coverage varies by firmware. An emulation that implements only part of the drawing model can keep the last shape and lose the earlier ones — behaviour no ZPL edit can fix, because the format was never the cause.
Two ways, no guesswork:
! U1 getvar "device.languages" (a CPCL-style
control query) and ^XA^HH^XZ (a ZPL host query) — whichever
one answers tells you which interpreter is listening.Not sure which language your file is written in? The printer language detector answers that half — note it reads the code, not the device.
If the configuration label reports anything other than native ZPL,
switch the printer to ZPL mode — setting device.languages to
zpl is usually the whole fix. If the firmware offers only the
emulation, the gap is the emulation's, and the workaround is to simplify
what the format asks of it rather than to fight the ordering.
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