Toshiba B-EP Series Interface Specification page 500

7.5.15 ERROR CORRECTION LEVEL SET COMMAND
Function Sets the error correction level.
Format [GS] qn
Term n: Error correction level to be set
Initial value n: M (Standard level)
Explanation (1) When "n" is set to any value other than the above, a command error occurs.
(2) This command is effective for the QR code only. If this command is set when
printing other barcode/two-dimensional codes, the command will be ignored.
Refer to Barcode/Two-Dimensional Code Print Command ([GS] k)
L: High density level
M: Standard level
Q: Reliability level
H: High reliability level
CHAPTER 7 RECEIPT MODE (INTERFACE COMMANDS)
[GS] q
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B-EP Series