Registers – Systems controlled by data bearing records – Credit or identification card systems
Patent
1995-04-11
1996-03-26
Shepperd, John
Registers
Systems controlled by data bearing records
Credit or identification card systems
235449, G06K 500
Patent
active
055022952
ABSTRACT:
A wireless communication system for communicating between a host system and a stand-alone device through an electromagnetic coupling medium is disclosed. The communication system has the capabilities of bi-directional data communications between the host and the stand-alone device and of powering the stand-alone device with energy pulses coupled through the electromagnetic coupling medium from the host. The electromagnetic medium is capable of supporting the bi-directional flow of energy pulses and energy transitions thereof between the host and stand-alone device. In one embodiment, bi-directional communication is provided by transmitting and detecting predetermined numbers of consecutive energy transitions coupled through the medium. Resting durations immediately precede and follow each predetermined number of consecutive energy transitions. In a preferred embodiment of the present invention, the host communicates a first binary value to the stand-alone device by coupling a first predetermined number of consecutive energy transitions to the device and a second binary value to the device by coupling a second predetermined number of consecutive energy transitions. Additionally, the host system receives data from the stand-alone device by first coupling a third predetermined number of consecutive energy transitions to the stand-alone device. The stand-alone device then responds by coupling a predetermined number of energy transitions to the medium during the resting duration following the host's transmission of the third predetermined number of consecutive energy transitions. The number of energy transitions sent by the stand-alone device during this resting duration is related to the value of the data digit being sent to the host.
REFERENCES:
patent: 4650981 (1987-03-01), Foleta
patent: 4827115 (1989-05-01), Uchioa et al.
Jaffe James M.
Owen William H.
Minh Le T.
Shepperd John
Xicor Inc.
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