| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve a following problem: freezers are arranged in different rooms and, by using a wireless data logger, convenience is improved compared with a wired system in that installation of wiring becomes unnecessary, layout change is easy to perform, or the like, but in the case that there is something shielding the radio wave propagation, a disadvantage that a radio wave is shielded and communication is interrupted in each divided space is caused. <P>SOLUTION: In a radio communication system consisting of a plurality of transmission/reception slave machines having a radio communication means and at least one transmission/reception master machine having a radio communication means, a radio repeater using a spread spectrum communication means is provided with: a low electric power radio transmission/reception part of the radio communication means; a spread spectrum transmission/reception part for performing communication with the low electric power radio transmission/reception part; and an electric light line transmission part for converting the communication contents of the spread spectrum transmission/reception part into a communication configuration for transmitting the communication contents on an electric lamp line. <P>COPYRIGHT: (C)2004,JPO&NCIPI |
