Brother QL-720NW - Manual (Page 62)

P-touch Template Command Reference
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7. Control Command Details
ESC iXf2 Change the prefix character
ASCII: ESC i X f 2 n1 n2 n3
Decimal: 27 105 88 102 50 n1 n2 n3
Hexadecimal: 1B 69 58 66 32 n1 n2 n3
Parameters
n1: 01h (Fixed)
n2: 00h (Fixed)
00h≤n3≤FFh
Description
 Changes the prefix character code.
n3: Character code
 The default text string for the prefix character is “^”.
 This command is a static command.
Example
 To change the prefix character to “_”:
ESC i X f 2 01h 00h 5Fh (“_”)
(1Bh 69h 58h 66h 32h 01h 00h 5Fh)