Petar Enev comments

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                                            Petar Enev

how to use the utils.calculate_crc()

It is correct but the bytes are swapped. With the input you provide the function returns 0x61D8. If you use some [online tool](https://crccalc.com/?crc=01020001&method=CRC-16/MODBUS&datatype=hex&outtype=0) it returns 0xD861.

When "data_format='f'",Invalid CRC in response

Maybe you should investigate the parse_response method of the RtuQuery class in modbus_rtu.py