How to `watch` output of `xxd` or `hexdump` command?

My tool is wtiting binary chars to stdout and I can view it in hex with # ./md /dev/ttyUSB0 | xxd 0000000: 6f03 1100 0003 0084 8400 0000 0900 0a00 o............... 0000010: 0008 0004 0000 0000 2c00 0000 0000 0000 ........,....... ... 00000b0: 8000 8000 8000 8000 8000 8000 8000 8000 ................ 00000c0: 8047 ffff ff6f 04fd 2180 ff02 f700 f702 .G...o..!....... 00000d0: fbb6 00bf 10e1 a57f 4004 fb00 a780 7e00 ........@. unfortunately, when I am trying to watch this screen watch ./md /dev/ttyUSB0 | xxd watch ./md /dev/ttyUSB0 | hexdump It prints something like either corrupting or misinterpretting output. What do I do wrong?