Brother TD-2120N - Manual (Page 33)

ESC/P Command Reference
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5. Control Command Details
ESC G Apply double-strike printing
ASCII: ESC G
Decimal: 27 71
Hexadecimal: 1B 47
Parameters
None
Description
 Prints the subsequent text in bold.
 This command is valid anywhere in a text line.
ESC H Cancel double-strike printing
ASCII: ESC H
Decimal: 27 72
Hexadecimal: 1B 48
Parameters
None
Description
 Cancels the bold style.
 This command is valid anywhere in a text line.
Example
Code: ABC ESC G DEF ESC H GHI FF
Print result: ABCDEFGHI