Brother TD-2120N - Manual (Page 84)

ESC/P Command Reference
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5. Control Command Details
(3) \\\: End of barcode
There must be three backslashes to end 2D barcode.
Example
Refer to the section “ Summary ”.
ESC i P QR Code version
ASCII: ESC i P n
Decimal: 27 105 80 n
Hexadecimal: 1B 69 50 n
Parameters
0≤n≤40
Description
 The barcode size can be fixed.
 The default value is 0.
 The available versions differ depending on the symbol type used.
If a setting other than those listed is specified, the setting returns to its default.
The following settings are available for each symbol type.
Model1 (0–14), Model2 (0–40), MicroQR (0–4)