Brother QL-720NW - Manual (Page 102)

ESC/P Command Reference
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5. Control Command Details
ESC iXX2 Specify default character size
ASCII: ESC i X X 2 n1 n2 n3 n4
Decimal: 27 105 88 88 50 n1 n2 n3 n4
Hexadecimal: 1B 69 58 58 32 n1 n2 n3 n4
Parameters
n1: 02h (Fixed)
n2: 00h (Fixed)
00h≤n3≤FFh, 00h≤n4≤01h
Description
 Specifies the default character size.
n3+(n4*256): Default character size (dots)
 The following settings (dots) are valid.
24, 32, 33, 38, 42, 46, 48, 50, 58, 67, 75, 83, 92, 100, 117, 133, 150, 167, 200, 233, 267, 300, 333, 367,
400
The manufacturer’s default is 32.
 This command is a static command.
Remarks
 Invalid if the setting is a value outside of the allowable range