RFID > Readers
RFID readers, which are often called Interrogator or scanners, send and receive RF signals that transmit data to and from the tag via antennas. A reader may have multiple antennas for the transferring and receiving of data. RFID readers are usually in the on state waiting for a response from any tag that comes within the vicinity of the read zone. However, there are situations (for example with hand held readers) where they are activated via a trigger so as to conserve power. Tag readers can come in many shapes and sizes from small hand held PDA type readers to more industrial fixed readers such as those typically found in warehousing loading bays.