I have a string that after print is like this: `\x4d\xff\xfd\x00\x02\x8f\x0e\x80\x66\x48\x71`

But I want to change this string to `"\x4d\xff\xfd\x00\x02\x8f\x0e\x80\x66\x48\x71"` which is not printable (it is necessary to write to serial port). I know that it ist problem with '`\`'. how can I replace this printable backslashes to unprintable?