An RFID tag simulator for the FDX and HDX protocols

A tag simulator is a device that can exchange data with an RFID reader in the same way as a real transponder. It may be of help for reader developers in the process of testing the device response and adjusting the communication algorithms. It may equally help system integrators in testing and tuning the performance of the complete RFID system that comprises the readers, the network to which they are connected and the database. The simulator described here is based on the Atmel AT91SAM7S64 micro-controller and covers the “transponder talk first” protocols of full duplex (FDX) and half duplex (HDX) types for the carrier frequencies of 125 KHz and 134.2 KHz.