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 Traceback (most recent call last):
  File "ac.py", line 63, in <module>
    main()
  File "ac.py", line 41, in main
    hex_result = moxa.send_command(ser, cmd, req_type)
  File "/opt/zabbix/pymoxa/MoxaClass.py", line 55, in send_command
    crc = modbus_crc(cmd)
  File "/usr/lib/python2.7/site-packages/minimalmodbus.py", line 1975, in _calculateCrcString
    _checkString(inputstring, description='input CRC string')
  File "/usr/lib/python2.7/site-packages/minimalmodbus.py", line 2224, in _checkString
    raise TypeError('The {0} should be a string. Given: {1!r}'.format(description, inputstring))
TypeError: The input CRC string should be a string. Given: u'\x02\x03\t\xea\x00\x02'

 cond_addr = cfg['conditions'][cond]['id']
                for req_type in sorted(cfg['reqs'].iterkeys()):
                    if cfg['reqs'][req_type].get('disable'):
                        continue
                    cmd = cond_addr + cfg['reqs'][req_type]['req']
                    #cmd = cmd.encode('hex')
                    #cmd = cmd.decode('hex')
                    hex_result = moxa.send_command(ser, cmd, req_type)
                    count = 3