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Across 4. A program or signal that is broadcast or sent out 6. Term which defines the direction of communications as being from transponder to reader 9. A device used to communicate with RFID tags 14. A credit card or loyalty card that contains an RFID chip to transmit information to a reader without having to be swiped through a reader. Such cards can speed checkout, providing consumers with more convenience 15. Term which defines the direction of communications as being from reader to transponder

Down 1. The main frequency of a transmitter, or RFID reader 2. The rules that govern how tags and readers communicate 3. An RFID tag with a battery. Can be read over a greater distance, but usually expensive. They have a limited lifetime as they are battery-powered 4. The tag 5. An RFID tag without a battery. They take the power they need from the electromagnetic signals transmitted by the reader. Can be easily made into a label as they are made thin 7. A device that detects the presence of an object and signals another device. Proximity sensors are often used on manufacturing lines to alert robots or routing devices on a conveyor to the presence of an object. They can be used in RFID systems to turn on readers 8. The reader 10. Same as the reader 11. A standard method of identifying the manufacturer and product category of a particular item 12. An event in which two or more data communication sources compete for attention at the same time and cause a clash of data 13. The amount of data that can be stored on the microchip in an RFID tag