Brother RJ-4040 - Manual (Page 32)

ESC/P Command Reference
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5. Control Command Details
ESC E Apply bold style
ASCII: ESC E
Decimal: 27 69
Hexadecimal: 1B 45
Parameters
None
Description
 Prints the subsequent text in bold.
 This command is valid anywhere in a text line.
ESC F Cancel bold style
ASCII: ESC F
Decimal: 27 70
Hexadecimal: 1B 46
Parameters
None
Description
 Cancels the bold style.
 This command is valid anywhere in a text line.
Example
Code: ABC ESC E DEF ESC F GHI FF
Print result: ABCDEFGHI