Brother RJ-4040 - Manual (Page 83)

ESC/P Command Reference
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5. Control Command Details
(3) \\\: End of barcode
There must be three backslashes to end 2D barcodes.
Example
For data “12345” with symbol type ECC square at 40 × 40 with a 3-dot cell size, the command will be as
shown below.
ESC i D 03h 00h 28h(40d) 28h 00h 00h 00h 00h 00h “12345” \\\