How to control serial device from shell

setup serial port:

$ stty -F /dev/ttyUSB0 raw
$ cat /dev/ttyUSB0 > /dev/null &

send commands (translating from hex string to binary):

$ echo "ff 00 00 01 04 00 01 81 03 00 00 ff" | xxd -r -p > /dev/ttyUSB0

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