Brother QL-720NW - Manual (Page 62)

ESC/P Command Reference
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5. Control Command Details
ESC U Specify minimum margin
ASCII: ESC U n
Decimal: 27 85 n
Hexadecimal: 1B 55 n
Parameters
2≤n≤3 or “2”≤n≤“3”
Description
 Specifies the minimum margin amount.
 n=2 or 50 (“2”): Specifies a minimum margin of 2 mm.
 n=3 or 51 (“3”): Specifies a minimum margin of 3 mm.
 Using this command clears all text.