Send string to record to TAG RFID with letters and numbers

Good day, as I can send a TAG through printer ZEBRA ZD500R I have the following code but nothing else pure pure hexadecimal but if some character differs from hexadecimals {0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,F} you can not record the Tag .

^XA
^FO50,50
^A0N,65

//Aquí mando grabar el TAG 
^RFW,H
^FD1234567890321456987451XZ
^FS

^XZ