| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a multiplex radio LAN device for realizing highly reliable communication without laying a cable. SOLUTION: When first and third antenna monitoring devices 30 and 32 detect that the transmission/reception success rate of first and third antennas 50 and 52 becomes less than a prescribed value or first and second radio LAN monitoring devices 16 and 17 detect re-transmission for more than the prescribed number of times, by the control signals of first and second changeover switch control parts 60 and 61, first and second changeover switches 20 and 21 switch a transmission line from the first and third antennas 50 and 52 to second and forth antennas 51 and 53.</p> |
