Brother TD-2120N - Manual (Page 39)

ESC/P Command Reference
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5. Control Command Details
SI Specify compressed characters
ASCII: SI
Decimal: 15
Hexadecimal: 0F
Parameters
None
Description
 Prints the subsequent text at half width.
ESC SI Specify compressed characters
ASCII: ESC SI
Decimal: 27 15
Hexadecimal: 1B 0F
Parameters
None
Description
 Same as SI