| 摘要 |
PROBLEM TO BE SOLVED: To provide a relaying apparatus used for a wireless guard system that is immune to a noise radio wave and can surely identify whether or not received data are regular data transmitted from a wireless sensor. SOLUTION: A control circuit 13 receives a signal demodulated by a demodulation circuit 12 and discriminates whether or not the signal has a predetermined prescribed format and whether or not an ID number in the format is equal to an ID number having been registered in advance in an ID number table 132. When the signal has the prescribed format and the ID number is registered, the control circuit 13 discriminates that the received signal is regular data transmitted from the wireless sensor 1, and retransmits the signal. The transmission frequency is the same as the transmission frequency of the data from the wireless sensor 1. COPYRIGHT: (C)2004,JPO |
