| 摘要 |
<P>PROBLEM TO BE SOLVED: To make a communication between a terminal and an apparatus by radio, and to change a periodic signal transmission interval in response to the distance. <P>SOLUTION: A terminal 1000 and an apparatus 2000 comprise a first transmitting and receiving means 100, and a second transmitting and receiving means 200 which can control a mutual communication distance stepwise. When the terminal 1000 can be communicated with the apparatus 2000 at a long distance (S500), a middle distance (S540), a short distance (S570), an approach distance (S600) or a contact distance (S630), respectively; a transmission interval of a periodic signal is changed at respective distances. <P>COPYRIGHT: (C)2007,JPO&INPIT |
