| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a method and system for reading a tag which is provided with an ID code and is capable of getting in and out from an electromagnetic field transmitted by a polling device. SOLUTION: The list of all the tags existing in the electromagnetic field of a polling device is generated and after then, a tag already entering the list is re-activated, whether the device still exists in the magnetic field or leaving it is confirmed from these tag and a tag entering the field is added. Thus, in order to permit execution of the update (step 30) of this list during a following reading cycle, first reading cycle (step 20) where each tag recognized during it is locked and an ordering number is assigned to each tag recognized during it is executed.</p> |
