A method of calling a plurality of transponders arranged in a transmission range of a calling apparatus and a method of calling a transponder

摘要

A single calling device calls multiple transponders arranged within the transmission range of the calling device and identifies multiple transponders without any mutual interference.;The non-interfering operation has an energy storage element, and for a transponder responsive to a calling pulse, with a response signal dependent on the condition that the charging voltage present in the energy storage element at the end of each calling pulse is within a predetermined voltage range A plurality of RF call pulses are sequentially transmitted and obtained by a calling apparatus in which time and its energy are changed into pulses and separated from each other.