Brother PT-9700PC - Manual (Page 26)

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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 per text line.
・ If n is less than 8, the line feed amount is set to 8/60 inch (approximately 0.34 cm).