| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To remove interference of a communication radio wave between a plurality of entrance/exit zone management devices arranged on near positions, and to thereby perform proper communication with a wireless dosimeter. <P>SOLUTION: After being started by a start signal from a desired entrance/exit zone management device 3A, the wireless dosimeter 2A performs radio communication with the desired entrance/exit zone management device 3A through a peculiar radio channel based on set information in the start signal. Even if the plurality of entrance/exit zone management devices 3A-3C are arranged on near positions, each of them communicates with the wireless dosimeter 2A through each different radio channel, radio wave interference between each entrance/exit zone management device is removed. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
