Line Feed Amount - Brother RJ-4030 Software Manual

3.4 Line feed amount

The amount of line feed is the amount of vertical movement from the print position of one line to the print
position of the next line.
The line feed amount is specified with ESC 0, ESC 2, ESC A, and ESC 3.
Within a single line of text, the tallest character is determined, and the baseline is moved so that the top
edge of that character is at the vertical print position.
The tallest character within a line becomes the line height.
If characters are underlined, 4 dots are added to the line height.
If the line height is greater than the specified line feed amount, the line height is used as the actual line
feed amount.
In this way, even if the specified line feed amount is small, the upper and lower lines will not overlap.
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Line feed amount
3. ESC/P Command Limitations
ESC/P Command Reference