Brother RJ-4040 - Manual (Page 67)

ESC/P Command Reference
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5. Control Command Details
ESC K 8-dot single-density bit image
ASCII: ESC K n1 n2 Data
Decimal: 27 75 n1 n2 Data
Hexadecimal: 1B 4B n1 n2 Data
Parameters
0≤n1≤255, 0≤n2≤3
The data contains n1+n2*256 bytes of image data.
Description
Specifies that an 8-dot single-density bit image is printed with the number of dot positions indicated by n1 and
n2.
 n1 and n2 indicate the number of dot positions.
n1: The remainder from dividing the number of dot positions by 256
n2: The quotient from dividing the number of dot positions by 256
B7 B6 B5 B4 B3 B2 B1 B0
Relationship between the image data and the dots
 First, the data is lined up in one row as follows:
1byte 1byte 1byte 1byte 1byte 1byte
…
n1+n2*256 bytes
MSB
LSB
 One dot of image data is enlarged to 4 dots vertically by 4 dots horizontally.
 As a result, the image is 32 dots vertically by (n1+n2*256)*4 dots horizontally.