Patent ID: 9189665
Filing Date: 2015-11-17
Classification: G06K

Abstract:
1. A method of detecting at least one contactless device that has a unique identification code (UID), the method comprising: requesting transfer of a UID; receiving at least one positive pulse indicative of a UID; and detecting whether more than one UID was transferred if the number of positive pulses received exceeds the number expected for one UID, wherein when more than one UID was detected, the method further comprising: selecting a first UID byte from UID bytes determined from the received positive pulses; requesting transfer of a UID having the selected first UID byte; receiving at least one positive pulse indicative of a UID; and detecting whether more than one UID having the selected first UID byte was transferred if the number of positive pulses received exceeds the number expected for one UID, wherein when more than one UID having the selected first UID byte was detected, the method further comprising: selecting a second UID byte from UID bytes determined from the received positive pulses; requesting transfer of a UID having the selected first UID byte and the selected second UID byte; receiving at least one positive pulse indicative of a UID; and detecting whether more than one UID having the selected first UID byte and the selected second UID byte was transferred if the number of positive pulses received exceeds the number expected for one UID.