What ^JM does
^JM switches the printer between full resolution and half the dots per millimetre. Half density prints faster and uses less memory but at lower quality; it must appear before ^XA takes effect on the next format.
Syntax
^JMaParameters
| Parameter | Description | Values | Default |
|---|---|---|---|
a | Dots per mm mode | A = full, B = half | A |
Example
^XA
^JMA
^XZPaste this into the free ZPL viewer to see it render, or convert it to PDF.
Notes & tips
- B halves resolution (e.g. 12 dpmm → 6 dpmm).
- Takes effect on the next label.
Related commands
See the full ZPL command reference for all 92 documented commands.