| 摘要 |
<p>PURPOSE: To easily establish a hopping period by permitting a slave set to normally wait by means of a poling channel and permitting a master set to execute packet communication within a usage possible time at the time of a contention channel or receiving the usage possible time. CONSTITUTION: The master set and the slave set consist of a control part 11 and a radio wave part 12. The control part 11 sets a channel in the radio wave part 12, fetches data received by the radio wave part 12 and a level and transmits transmission data to the radio wave part 12. When it is recognized that the carrier sense CS of the poling channel f1, the master set transmits the contention channel f7 and the usage possible time through the use of the channel f1 to the whole slave sets and the slave sets receive the channel f7 and the usage possible time of the channel. Then, the master set and the slave set execute packet communication within the usage possible time by the channel and the master set returns the channel to f1 when the time elapses. Then, the succeeding channel f7 and the channel usage possible time are transmitted to the whole slave sets within a radio wave zone for the succeeding packet communication.</p> |
