| 摘要 |
PURPOSE: To shorten communication time by decreasing the number of repeater stations without lowering communication reliability when transmitting information from a master station through repeater slave stations to a terminal slave station by low power radio. CONSTITUTION: The repeater station between a master station M and a terminal slave station S4 is defined as S2 and a response monitoring station S1 with the repeater station S2 as a station to be monitored a response and a response monitoring station S3 with the slave station S4 as a station to be monitored a response are provided. The master station M sends information to the repeater station S2 (1) and the S2 sends the information to the slave station S4 (8). The information sent through such a route (3) to the repeater station S2 is sent to the response monitoring station S1 as well like (2) and when the repeater station S2 receives the information from the master station M, the response showing such a state is reported to the response monitoring station S1 like (6), (5). In this case, when the information of the master station M is not dispatched to the repeater station S2, there is no response of the repeater station S2 even after the lapse of prescribed time from the information transmission of the master station so that the response monitoring station S1 can relieve it by sending the information received from the master station to the repeater station S2. |
