I have looked at the Zebra documentation for ZPL as well as searched here on SO to no avail. My scenario is this, I wish to print a barcode on a label using a Zebra printer and ZPL print language but instead of the interpretation line (the human-readable bit below the barcode) being the human-readable version of the barcode I would like it to be a totally different value, e.g. a persons name.
This is the ZPL II guide I am using for reference: http://www.ypsylon.com/download/ZPLII_Guida.pdf
You cannot override the text that prints as part of the interpretation line (aka human readable), however you can turn the interpretation line off and add second text field:
^XA
^BY3,3,146^FT52,166^BCN,,N,N
^FD>:your_barcode_data_here^FS
^FT241,309^A0N,28,28^FH\^FDyour_text_data_here^FS
^PQ1,0,1,Y^XZ
To turn off the human readable set the 3rd parameter of the ^BC command to N.
You can play with the position of the text field to get the desired effect.
Check page page 89 of the current manual for more info.