Process and device to transmit data between a read/write device and a transponder
First Claim
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1. A process for transmitting data between a printing and reading device and a transponder comprising the steps of:
- a) transmitting a data signal from a read/write device to a transponder via an electromagnetic or magnetic field;
b) changing the field strength of the electromagnetic or magnetic field during the data transmission while maintaining substantially the same frequency; and
c) calibrating a frequency for the field at the beginning of the data transmission by transmitting a signal between said printing and reading device and said transponder wherein the signal has predetermined time intervals.
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Abstract
The invention relates to a device and process for data transmission. The data is transmitted by changes in the field strength of an electromagnetic or magnetic field, and then the times between at least two sequential field strength changes are evaluated. A frequency serving as the time base for evaluating the times between the field strength changes is calibrated at least at the beginning of data transmission so that it has a set relationship to the cycle duration of the field strength changes.
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Citations
13 Claims
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1. A process for transmitting data between a printing and reading device and a transponder comprising the steps of:
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a) transmitting a data signal from a read/write device to a transponder via an electromagnetic or magnetic field; b) changing the field strength of the electromagnetic or magnetic field during the data transmission while maintaining substantially the same frequency; and c) calibrating a frequency for the field at the beginning of the data transmission by transmitting a signal between said printing and reading device and said transponder wherein the signal has predetermined time intervals. - View Dependent Claims (2, 3, 4, 5, 8, 9, 10)
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6. A process for transmitting data between a printing and reading device and a transponder comprising the steps of:
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a) transmitting a data signal from a read/write device to a transponder via an electromagnetic or magnetic field; b) changing the field strength of the electromagnetic or magnetic field during the data transmission while maintaining substantially the same frequency; c) calibrating a frequency for the field at the beginning of the data transmission by transmitting a signal between said printing and reading device and said transponder wherein the signal has predetermined time intervals; and d) deriving a correction value from the systematic time deviation from a set point that arises from an imprecision of an internal time base used for evaluation so that the correction value calibrates the internal time base at the beginning of the data transmission. - View Dependent Claims (7)
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11. A device to transmit data from a read/write device to a transponder comprising:
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a free-running oscillator that serves as a time base for the frequency used to evaluate the times between the field strength changes; and a plurality of frequency determining components that are changed to calibrate the time base, wherein a data signal is transmitted by changing the field strength of the electromagnetic or magnetic field while maintaining substantially the same frequency. - View Dependent Claims (12)
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13. A device for transmitting a data signal from a read write device to a transponder comprising:
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a free running oscillator serving as a time base for the frequency used to evaluate the times between field strength changes in the data signal; at least one frequency-determining component that is changed to calibrate the time base; and a frequency divider coupled to said free running oscillator and having a divider ratio that is used to calibrate the time base, wherein a data signal is transmitted by changing the field strength of the electromagnetic or magnetic field while maintaining substantially the same frequency.
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Specification