5525B/31/32 Line Matrix Printer LinePrinter Plus Programmer's Reference

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Chapter 3 Configuring the Proprinter III XL Emulation with Control Codes
Underline
ASCII Code ESC - n
Hex Code 1B 2D n
Dec Code 27 45 n
Purpose Enables or disables automatic underlining of all characters.
Discussion When automatic underline is enabled, all characters, including
spaces, are underlined until disabled.
where
n may range from 0 through 255 (hex 01 through hex FF).
n = 1, 3, 5 (any odd value) selects underlining.
n = 0, 2, 4 (any even value) cancels underlining.
Example The following sample illustrates automatic underlining and
underlining reset.
Unidirectional Printing
ASCII Code ESC U n
Hex Code 1B 55 n
Dec Code 27 85 n
Purpose Sets or cancels unidirectional printing. While this feature reduces
print speed by 1/2, the increased print quality will improve the
readability of barcodes and graphics.
Discussion This code sets or cancels unidirectional printing, as follows:
where
n may range from 0 through 255 (hex 00 through hex FF).
n = 1, 3, 5 (any odd value) selects unidirectional text printing.
n = 0, 2, 4 (any even value) cancels unidirectional text printing.