Transfer program from pc to mazak fusion 640mt

Hi all,
I’m trying to get the communication working on our integrex 200sy. I can send an eia program from the machine to the pc, but then I try to send it right back and I haven’t been able to get it to work. I’m getting codes 550 & 551 something like“ couldn’t locate program on tape”. I’m using data I/o, tape, and only trying to transfer eia programs. When I send from the machine to the pc it output a % sign at the beginning of the program. I tried deleting that as well as leaving it, to no avail. Also the machine outputs several G424 codes at the beginning of the program,?.

Obviously I don’t know much about this, and am looking for some expertise on the subject.
Ay hel is appreciated.