Brother TD-2120N - Manual (Page 109)

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.
The maximum valid setting is n=400.
*The manufacturer’s default is 24.
 This command is a static command.
Remarks
 Invalid if the setting is a value outside of the allowable range