fault readign State
In [5]: dev.status() Out[5]: 'The device is in ON state.'
In [6]: dev.state() API_CorbaException: IMP_LIMIT CORBA system exception: Unknown minor code: b (For more detailed information type: tango_error)
In [7]: a=dev.read_attribute('State') Data Error: Invalid Head (For more detailed information type: tango_error)