Brother International QL-810W ESC/ P Command Reference - Page 22

Line feed amount, If characters are underlined, 4 dots are added to the line height.

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ESC/P Command Reference 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. HHHHHHHHHHHHH HHHHHHHHHHHHH HHHHHHHHHHHHH Line feed amount 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. - 16 - 3. ESC/P Command Limitationsi

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ESC/P Command Reference
- 16 -
3. ESC/P Command Limitationsi
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.
Line feed amount
HHHHHHHHHHHHH
HHHHHHHHHHHHH
HHHHHHHHHHHHH
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.