Brother TD-2120N - Manual (Page 103)

ESC/P Command Reference
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5. Control Command Details
ESC i L Specify landscape orientation
ASCII: ESC i L n
Decimal: 27 105 76 n
Hexadecimal: 1B 69 4C n
Parameters
n=0, 1 or 48, 49
Description
 Applies or cancels the landscape orientation
n=1 or 49 (“1”): Applies the landscape orientation.
n=0 or 48 (“0”): Cancels the landscape orientation.
 Using this command clears all text.
 Before entering text, specify the paper orientation with this command.
 When the printer is turned on, the landscape orientation is canceled.
ABC
ABC