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RFID tags are polled input devices. The computer must send out a radio frequency polling request and any RFID tags that recognize the request transmit back their reply code (including ID info.). The computer must then sort out the various codes it received back. If there is more than one RFID tag responding at the same time, this sorting must still be performed successfully at the computer so that all RFID tags will be correctly logged.

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Q: Is RFID an input or output device?
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