HP DMXTM 400/430 Operator's Manual page 49

If any letter or number is entered in the FNT position other than
those specified above, the 'Invalid Font Type' message will
appear.
You will need to re-enter the data. After entering the desired font
and pressing the return key, the cursor will move to the XW
position.
DMX 400/430 Operator's Manual
Creating Labels Using Internal Batach Software
A bar code, followed by the return key. Choices are
uppercase A through R, except for P (Postnet). For bar
codes that include the human-readable interpretation
line, or lowercase a through r for bar codes without
human-readable lines, see Appendix C for examples of
each available bar code.
X is a special font choice that is not actually a font. The
X font selects box and line drawing. Later, in the
data/prompt position, the format for lines or boxes must
be entered .
Y is another special font choice that is not actually a
font. The Y font selects a graphic image that has already
been loaded into the memory module. If this font is
selected, enter the name of the graphic image in the
data/prompt position. This name must be uppercase
characters when printing an image.
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