Linux CNC terminal cannot display hexadecimal string

Hello, brothers:
I'm new to Linux CNC and python
Recently, I wrote a python API for communication.

My procedure is very simple:
① Accept data from serial port
② Print to terminal
③ Send it back to the serial port intact

My PC uses the serial port assistant to send the hexadecimal string to linuxcnc, and I use Python language to print it on the terminal. Then send it back to the serial port assistant intact.

There are no problems in sending and receiving. The data sent is the same as the data received. But why? My terminal displays a blank? What should I do?

You have to convert the characters to ASCII if you want to display them in the terminal.
For example if you want to have a "0" displayed, you have to send 0x30.

See: www.rapidtables.com/code/text/ascii-table.html

Hello!
Is there no other way, because I don't want to change the data structure sent. I've written the program there and don't want to change it.
Can I change it at the python receiver? Let this character show

in python3, (eg master branch) where x is an integer
hex(x)
returns a hexadecimal string.