Brother TD-2120N - Manual (Page 75)

ESC/P Command Reference
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5. Control Command Details
ESC L 8-dot double-density bit image
ASCII: ESC L n1 n2 Data
Decimal: 27 76 n1 n2 Data
Hexadecimal: 1B 4C 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 double-density bit image is printed with the number of dot positions indicated by n1
and n2.
 Same behavior as M=1 specified in ESC *.