| 摘要 |
<p>PROBLEM TO BE SOLVED: To cause a master station and a data collection center system to receive rapidly and surely an alarm call issued by a slave station, even if the master station is continuously collecting data from a multiplicity of slave station over a long time. SOLUTION: This wireless system is equipped with the master wireless station, by plurality of slave wireless stations, and the data collection center system. The center system is used, in such a way that when the center system transmits to the master station, a data collection directing telegraphic message signal for directing the master station to collect data provided in a slave station, if a master station to which a data collection directing telegraphic message signal has been transmitted immediately before the transmission of this message signal is the same as the above master station, a time interval at least larger than a first prescribed time period is set between the two transmissions to the same master station.</p> |
