I did a cursory scan through the Introduction of the document, and that pointed me at the "Examples" section. If I read correctly, you format your document using their mark-up language(ZPL) and then "save the document and copy it to the printer" (one assumes they mean drag-and-drop, since it appears to be a Windows only device). So, you might be able to send the command string to the printer using print(). It would be worth a try. (If this particular brand of bar-code printers is fairly popular in the Wild, this might well be a good module to develop for CPAN.)

Good luck, let us know what you find out.