Highly reliable wireless communication technology for remote monitoring of factories and buildings

Tokyo, September 1, 2011 --Hitachi, Ltd. (NYSE: HIT/TSE: 6501, hereafter, Hitachi) today announced the development of technology to increase the reliability of remote monitoring systems using cellular mobile telephone networks to wirelessly transmit data collected from sensor terminal measuring the status equipment in factories and buildings to monitoring center. This technology reduces the arrival time of alarm signals. By avoiding other radio waves which interfere with data transmission from the sensor terminals, not only the data communication error ratio is reduced but also transmission of irregular data measured by the sensor terminal is prioritized. With apply this technology, it enables the stable wireless collection of data measured by the sensor terminals as well as important alarm information. Results of verification experiments performed with a prototype system set up in a Hitachi’s factory showed that sensor terminal data communication error ratio was reduced to about one-hundredth of previous levels and that the alarm signal arrival time delay using a cellular mobile telephone network was reduced to about onetenth.