Passive RFID tags can be powered by a . Readers can be self-contained units with antennas, portable units with built-in antennas, small plates attached within printers, or integrated into larger machines. The reader is required to send energy to the tag, receive data matching the tag communications, and distinguish between these signals.
The majority of readers can read and write a tag. The reading function reads data from the chip in the tag. Similarly, the writing function writes the appropriate data to the tag's chip. If a factory sends finished goods to a distribution center, for example, the manufacturer's identification can be written on the tag.
Passive RFID tags can be powered by a RFID scanner. Readers can be standalone units with antennas, portable units with built-in antennas, small plates installed within printers, or embedded in larger machines.