Please help me,

We have numbered labels that we want to print with Browser print, we send each label like this:

^XA^FO100,100^A0N,50,50^FD Label: 1^FS^XZ

^XA ^FO100,100^A0N,50,50^FD Label: 2^FS^XZ
^XA^FO100,100^A0N,50,50^FD Label: 3^FS^XZ
.
.
But the printed labels are never in order and it's random, does anyone know a ZPL command to set the numbering of each label for the printer to print them in the order defines 1,2,3, ...etc. ?
Thanks
Alexander