Brother QL-720NW - Manual (Page 45)

ESC/P Command Reference
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5. Control Command Details
ESC 3 Specify minimum line feed
ASCII: ESC 3 n
Decimal: 27 51 n
Hexadecimal: 1B 33 n
Parameters
0≤n≤255
Description
 Specifies a line feed of n/300 inch per line.
 The line feed is specified in 1-dot units.
ESC A Specify line feed of n/60 inch
ASCII: ESC A n
Decimal: 27 65 n
Hexadecimal: 1B 41 n
Parameters
0≤n≤255
Description
 Specifies a line feed of n/60 inch.
 The line feed is specified in 5-dot units.