Patent ID: 6498923
Filing Date: 2002-12-24
Classification: G06K

Abstract:
A multiple mode capable data communication apparatus for data communication with an interrogator, said interrogator being adapted to operate in a one-wave mode operation in which a first signal of a first frequency modulated with interrogation data is transmitted, or in a two-wave mode operation in which the first signal of the first frequency is not modulated and a second signal of a second frequency modulated with the interrogation data is transmitted, said data communication apparatus comprising:power generating means for generating power from the first signal transmitted from said interrogator; demodulating means for demodulating the interrogation data of the first signal when the interrogator is in the one wave mode operation, and demodulating the interrogation data of the second signal when the interrogator is in the two wave mode operation; switching means for switching the demodulating means between a one wave mode operation and a two wave mode operation; and modulating means for modulating response information for the interrogation data obtained by the demodulated first signal, to a signal of the first frequency when said interrogator is in the one-wave mode operation, and for modulating the response information for the interrogation data obtained by the demodulated second signal, to a signal of the second frequency when said interrogator is in the two-wave mode operation.