HP LineJet Printers - PCL-II/LinePrinter Plus Technical Reference Manual, 171249-001PX

Underline
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Underline
ASCII Code ESC - n
Hex Code 1B 2D n
Dec Code 27 45 n
Purpose Turns automatic underlining on and off.
where
n = NUL (hex 00) or 0 (hex 30) to turn off underlining
n = SOH (hex 01) or 1 (hex 31) to turn on underlining
Discussion Spaces are underlined, but graphics and grey scale characters
are not.
Example The following sample illustrates underlining.
Unidirectional Printing, 1 Line
ASCII Code ESC <
Hex Code 1B 3C
Dec Code 27 60
Purpose Causes printing to occur from left to right for one line only.
Discussion Printing normally occurs in both directions of shuttle movement.
This command causes the printer to print from left to right for one
line. The command is cancelled by a CR.
Unidirectional Printing, Set/Reset
ASCII Code ESC U n
Hex Code 1B 55 n
Dec Code 27 85 n
Purpose Causes printing to occur in only one direction of shuttle
movement (left to right).
where
n = NUL (hex 00) or 0 (hex 30) to turn off unidirectional printing
n = SOH (hex 01) or 1 (hex 31) to turn on unidirectional printing
Discussion Printing normally occurs in both directions of shuttle movement.
Unidirectional printing slows the printer down approximately
50%, but is sometimes used when very accurate dot placement
is desired in graphics.