Lexmark 3455 - Manual (Page 166)

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B.8 Postnet Font Support
The Postnet bar code font is available in all emulations on IPDS code level 8223 and
above.
Typeface FGID
Postnet 4094
Code pages that can be used with FGID 4094 include the following.
Codepage GCSGID Function
1301 1451 Postnet bar code
1302 1452 Facing Identification Marks
1303 1453 Business Reply Bar
In addition the Postnet font can also be used to replace numeric characters on other
code pages.