Nanokdp unrecognized USB Serial Device

I can see my serial device in /dev as below:

But I couldn’t see my serial device in the nanokdp serial device list, as shown below:

So I have following question,

Q1) How do the nanokdp recognize the USB device as a serial device in your list?

Q2) Have any document or manual or any material that I can refer for the nanokdp?