The ID verification method null in the wireless radio use type automatic management

摘要

PURPOSE: To extend a battery life in a radio communication type control system. ;CONSTITUTION: In a radio communication type automatic control system performing the communication of the information of an automatic inspection gas meter 6 between a radio master machine 4 and a radio slave machine 5 by radio and between the radio master machine 4 and a control center 1 via a telephone line 2, respectively, by connecting the control center 1 and the radio master machine 4 by the telephone line 2 and connecting the automatic inspection gas meter 6 and the radio slave machine 5 through wire, a differentiation circuit 11 is connected with the level output terminal of an ID confirmation modulation circuit 8, the waveform outputted from this differentiation circuit 11 is judged as an ID confirmation signal when the waveform rises by carrier sense timing, an ID confirmation operation is perfomed, and the wave is judged as a noise radio wave when the waveform is the one deviated from the carrier sense timing and carrier sense is halted.;COPYRIGHT: (C)1996,JPO