Patent ID: 6980100

Claim:
An alarm system, comprising: an RFID reader having means for transmitting and receiving query and reply signals, respectively, said RFID reader including means for transmitting a plurality of unique alarm signals; a plurality of RFID tags remote from said RFID reader, each said RFID tag including a respective tag receiver for receiving said query signals from said RIFD reader and a respective tag transmitter for transmitting said reply signals, each said tag transmitter having a predetermined tag transmission identifier different from a predetermined tag transmission identifier of any other said tag transmitter, each said RFID tag including means for including a respective tag transmission identifier in a respective reply signal, each said RFID tag being associated with a respective unique alarm signal; wherein said RFID reader includes means for recognizing a respective tag transmission identifier included in a received reply signal and for associating said recognized tag transmission identifier with a corresponding RFID tag and a corresponding unique alarm signal; and an alarm unit remote from said RFID reader and said plurality of RIFD tags having an alarm receiver for receiving said unique alarm signals transmitted by said RFID reader, said alarm unit including means for energizing said alarm according to said corresponding unique alarm signal received by said alarm receiver, whereby to indicate said corresponding RFID tag.