Brother TD-2120N - Manual (Page 67)

ESC/P Command Reference
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5. Control Command Details
 One dot of the image data is enlarged as follows, according to the value of m.
m=32 m=33 m=38 m=39
 As a result, the image is sized depending on the value of m, as follows:
m=32 24 dots vertically×(n1+n2*256)*4 dots horizontally
m=33 24 dots vertically×(n1+n2*256)*2 dots horizontally
m=38 24 dots vertically×(n1+n2*256)*3 dots horizontally
m=39 24 dots vertically×(n1+n2*256)*1 dots horizontally