my zebra zt410 cannot print thai characters

now, i already finished installing thai font, ANGSA.TTF and i use below zpl command to command my printer.

















^FD26 สิงหาคม ๒๕๖๑^FS





then the printer print only HELLO, 500 and bangkok. For more information, i send this command by using rs232. i hope you can solve this problem. Thank you for your help.