Brother QL-720NW - Manual (Page 101)

ESC/P Command Reference
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5. Control Command Details
ESC iXk1 Retrieve default font
ASCII: ESC i X k 1 n1 n2
Decimal: 27 105 88 107 49 n1 n2
Hexadecimal: 1B 69 58 6B 31 n1 n2
Parameters
n1: 00h (Fixed)
n2: 00h (Fixed)
Description
 The default font setting is returned as 3-byte data.
[1] 01h (Fixed)
[2] 00h (Fixed)
[3] Setting
00h: Brougham (bitmap) (Manufacturer’s default)
01h: Letter Gothic Bold (bitmap)
02h: Brussels (bitmap)
03h: Helsinki (bitmap)
04h: San Diego (bitmap)
09h: Letter Gothic (outline)
0Ah: Brussels (outline)
0Bh: Helsinki (outline)
 The retrieved value is a value specified by a static command.