Esc - N - Bematech LR2000 Programming Manual

 When 24-dot bit image is selected:

ESC - n

[Name] Turn underline mode on/off
[Format] ASCII
Hex
Decimal
[Range]  n2, 48 n 50
[Description] Turns underline mode on or off, based on the following values
n
0, 48
1, 49
2, 50
 The printer can underline all characters (including right-side character spacing), but
[Notes]
 The printer cannot underline 90clockwise rotated characters and white/black
 When underline mode is turned off by setting the value of n to 0 or 48, the following
 Changing the character size does not affect the current underline thickness.
ESC - n
1B 2D n
27 45 n
Function
Turns off underline mode
Turns on underline mode (1 dot thick)
Turns on underline mode (2 dots thick)
cannot underline the space set by HT.
inverted characters.
data is not underlined, and the underline thickness set before the mode is turned
off does not change. The default underline thickness is 1 dot.
LR2000 Programming Manual V1.2