System and method for initiating communications between a controller and a selected subset of multiple transponders in a common RF field

摘要

The method involves initially transmitting a digital signal from the controller to the transponders representative of a possible it of the n-bit digital address. A signal is responsively transmitted for a subset of transponders to the controller. The non-responsively transmitting transponders alternatively enter a reset state. A next digital signal is transmitted form the controller to a responding number of transponders representative of a possible next bit of the digital address of the subset. A signal is responsively transmitted from a second subset of transponders. Additional next digital signals are alternatively transmitted from the controller to the transponders representative of possible additional next bits of the n-bit digital address of the responsively transmitting transponders until the digital signals transmitted form the controller to the transponders representative of the possible first, next and additional next bits of the n-bit address correspond with the first, next and additional next bits of the n-bit address of the selected subset of the transponders.