Patent ID: 7174268
Filing Date: 2007-02-06
Classification: H04Q

Abstract:
1. A wireless measuring device comprising: a plurality of child units each having a specified identifier; and a parent unit to receive data measured by the child units by wireless communication; wherein each of said child units comprises a controlling section that can move to a standby state, a measuring unit, a measurement instructing signal receiving unit to receive a measurement instructing signal from said parent unit, an external timer and a measured data transmitting unit to transmit data measured by said measuring unit by wireless communication, wherein said parent unit comprises a measurement instructing signal transmitting unit to transmit the measurement instructing signal to said child units by wireless communication and a measured data receiving unit to receive the measured data transmitted from said measured data transmitting unit, wherein said child unit is so configured that said controlling unit of said child unit is put into a driving state from a standby state in every determined time and, when said measurement instructing signal receiving unit receives the measurement instructing signal, transmits data measured by said measuring unit to said parent unit in synchronization with individual transmission start time determined based on the identifier of each of said child units by using, as a reference time, transmission start reference time obtained based on reference time data contained in said measurement instructing signal, and wherein said child unit is so configured that a time delay occurring between a standby state and a driving state of said controlling unit is compensated for in a manner to match real time shown by the external timer.