Patent ID: 9661401
Date: 2017-05-23
CPC Classifications: G06K,H04Q

Claim:
1. A method comprising: receiving, by a transponder, a locating command for locating the transponder; in response to receiving the locating command, transmitting, by the transponder, in a persistent operating state, a locating signal for locating the transponder; comparing, by an impedance control device coupled to a memory and a counter, a counter state of the counter with a counter value stored in the memory; in response to determining that the counter state matches the stored counter value, changing, by the impedance control device, a state of a modulation signal, such that a phase of the locating signal is changed; in the persistent operating state, receiving, by the transponder, a switch-off command while simultaneously transmitting, without an interruption for receiving the switch-off command, the locating signal; and discontinuing transmission of the locating signal in response to one or more of: