On complex labels, starts printing from the given dot row before the whole format is ready (a throughput setting). It does not affect the preview.
^SPaThis command is a printer setting: the preview recognises it and skips it, because it does not change how the label looks. Its effect shows on the real printer.
^SP500| Parameter | Description | Type | |
|---|---|---|---|
a | dot row at which printing starts | int | Default: 0 · Range: 0–32000 · ignored in preview |
The marked parameters are part of the ZPL specification and work on a real printer; the preview engine ignores them today.