The font used to generate the barcode and either the font height (in points) are displayed here and may be changed by pushing the Change button and selecting the required options. Alternatively the equivalent X unit value (the thickness of the thinnest bar in mils) may be entered (the font height will then be set automatically).
The barcode font must be one of UNAx, UNBx, UNCx, UNDx or UNEx, where x will normally be W (for the wide font), but may be R (reduced width) or N (narrow width) to suit specific printer technologies.
Note that Clocked barcodes (eg. Postnet or RM4SCC) must be created using the UNF font and using the recommended font heights which are:
Australia Post 16-17 point
Korean PA 26-28
point
PostNet/Planet 18 point
RM4SCC 16-17 point
More: