Brother QL-720NW - Manual (Page 43)

ESC/P Command Reference
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5. Control Command Details
ESC X Specify character size
ASCII: ESC X m nL nH
Decimal: 27 88 m nL nH
Hexadecimal: 1B 58 m nL nH
Parameters
Character width: The value of m is irrelevant.
Character size:
Valid only with:
nL=24, 32, 48 dots
nH=0
Valid only with:
nL=33, 38, 42, 46, 50, 58, 67, 75, 83,
92, 100, 117, 133, 150, 167, 200, 233
nH=0
nL=11, 44, 77, 111, 144
nH=1
Description
 This command is used only to change the size.
 Outline must not be specified.
 The character width cannot be specified.
 The character size is specified as n=nL+nH*256 dots.
 The width and the height are the same.
 With bitmap fonts, only n=24, 32 and 48 are valid.
 With outline fonts, n is valid only when it is one of the following values:
33, 38, 42, 46, 50, 58, 67, 75, 83, 92, 100, 117, 133, 150, 167, 200, 233, 267, 300, 333, 367, 400
 The commands for specifying stretched characters, compressed characters and the character spacing
(SO, ESC W, SI, ESC !, ESC SP) remain available.
Example
For “ABC” at a 24-dot size and “DEF” at a 50-dot size:
Code: ESC k 01h
ESC X 00h 18h 00h ABC
ESC k 09h
ESC X 00h 32h 00h DEF FF
Print result: ABC
DEF