ZEBRA GT800 QR printer control commands

Hi,

I am new to the ZEBRA GT800 QR printer control.

I want to know the difference between the following commands.

^BQN,2,10  <===  There is a comma on the right side of the ^BQN.

^BQN2,10   <===  There is a comma on the right of the number ^BQN2.

Next question:

I want to know the difference between the three commands below.

^FD123zebra^FS

^FDMM,123zebra^FS

^FDMA,123zebra^FS

Regards

Cho