Brother QL-720NW - Manual (Page 40)

ESC/P Command Reference
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5. Control Command Details
ESC – Apply/cancel underlining
ASCII: ESC - n
Decimal: 27 45 n
Hexadecimal: 1B 2D n
Parameters
n=0, 1, 2, 3, 4 or 48 (“0”), 49 (“1”), 50 (“2”), 51 (“3”), 52 (“4”)
Description
 Applies or cancels underlining.
n=4 or 52 (“4”): Applies underlining with a width of 4 dots.
n=3 or 51 (“3”): Applies underlining with a width of 3 dots.
n=2 or 50 (“2”): Applies underlining with a width of 2 dots.
n=1 or 49 (“1”): Applies underlining with a width of 1 dot.
n=0 or 48 (“0”): Cancels underlining.
 This command is valid anywhere in a text line.
 The underlining specified with this command is a continuous line.
 Spaces between characters and words are also underlined.
 Areas with the “specify absolute horizontal position” (ESC $) and “specify relative horizontal position”
(ESC \) commands are not underlined.
 Bit images and barcodes are not underlined either.
 4/300 inch (4 dots) is added to the line feed amount for lines that include underlined characters.
 The underline is positioned as follows:
Underline Underline Position
1 dot wide 2/300 inch (second dot) below the characters
2 dots wide Between 2/300 inch (second dot) and 3/300 inch (third dot) below the characters
3 dots wide Between 1/300 inch (first dot) and 3/300 inch (third dot) below the characters
4 dots wide Between 1/300 inch (first dot) and 4/300 inch (fourth dot) below the characters
ABCDE ABCDE ABCDE
(1-dot width) (3-dot width)
Example
Code: ABC ESC - 1 ABC ESC - 0 ABC FF
Print result: ABCABCABC