Can a Reader Detect That a Tag Has Been Removed?

By RFID Journal

  • TAGS
Ask The ExpertsCan a Reader Detect That a Tag Has Been Removed?
RFID Journal Staff asked 6 years ago

Is it possible, using a contactless Near Field Communication (NFC) reader, to determine if a tag is still there after a certain span of time?

—Name withheld

———

Yes. With any passive RFID reader, the device continually communicates with a tag. If the tag is removed, it no longer responds. Readers can be set up to indicate when a tag no longer responds, and to transmit that information to a back-end system.

—Mark Roberti, Founder and Editor, RFID Journal

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