| 摘要 |
PROBLEM TO BE SOLVED: To provide a system where data can be collected with simple configuration and by means of efficient data communication by forming a radio channel in a direct communication mode between slave machines and transmitting data to a data collection device through the radio channel by bearer transmission. SOLUTION: The PHS data communication equipment 111 on a master side sequentially accesses the PHS data communication equipments 112-11N on a slave side and selectively transmits the request of data collection through the radio channel in the direct communication mode between the slave machines. The PHS data communication equipments 112-11N on the slave side transmit data generated by respective user units 212-21N through the radio channel by the polling system when the request of data collection is arrived from the PHS data communication equipment 111. Then, the PHS data communication equipment 111 collects respective pieces of data arrived from the PHS data communication equipments 112-11N to a data collection device 31. |
