Data communications system
First Claim
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1. A data communications system in which a communications interface circuit is provided with and receives a signal from another apparatus comprising:
- a high impedance input circuit, whose impedance is predetermined, receiving an input signal from said another apparatus with its specified input impedance; and
a power supply circuit which obtains said input signal from an input terminal of said high impedance input circuit and draws electric power from said input signal to supply power to said data communications system, whereby said input signal is also used as a drive power source to said data communications system.
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Abstract
A data communications system includes a high impedance input circuit, which serves as an input circuit linking between a communications interface and a data terminal equipment, and a power supply circuit which obtains a receiving signal from an input terminal of the high impedance input circuit and draws electric power from the receiving signal to supply to the data communications system.
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Citations
20 Claims
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1. A data communications system in which a communications interface circuit is provided with and receives a signal from another apparatus comprising:
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a high impedance input circuit, whose impedance is predetermined, receiving an input signal from said another apparatus with its specified input impedance; and a power supply circuit which obtains said input signal from an input terminal of said high impedance input circuit and draws electric power from said input signal to supply power to said data communications system, whereby said input signal is also used as a drive power source to said data communications system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A data communications system in which a communications interface circuit is equipped with and receives a signal from another apparatus via a plurality of signal receiving lines, comprising:
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a plurality of high impedance input circuits, whose impedance is predetermined, receiving an input signal through said signal receiving line with their predetermined input impedance; and a plurality of power supply circuits which obtain said input signals from input terminals of said plurality of high impedance input circuits and draw electric power from said input signals; an electric power output block which combines every output produced by said power supply circuits and supplies the combined electric power to said data communications system, whereby said input signals are also used as a drive power source to be supplied to said data communications system. - View Dependent Claims (13, 14, 15, 16, 17)
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18. A data communications system in which the RS 232C interface circuit is provided with and receives signals from another apparatus via a signal receiving line incorporating a plurality of lines comprising:
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a plurality of high impedance input circuits, whose impedance are predetermined, receiving input signals through said signal receiving lines with their predetermined input impedance; and a plurality of power supply circuits, which obtain said input signals from said input terminals of said plurality of high impedance input circuits and draw electric power from said input signals to supply power to said data communications system, whereby said input signals are also used as a drive power source to be supplied to said data communications system, wherein said high impedance input circuits comprise; (1) clamp circuits incorporating resistors which restrict the power of said input signals and the power of said clamp circuits putting a clamp on signals sent from said resistors and producing output of them; (2) level conversion inverters which convert signals obtained from said clamp circuits to a predetermined level and produce the output of the converted signals; and
also said power supply circuits comprise;(1) rectifiers which produce said full-wave-rectification of the signals obtained from said input terminals of said plurality of high impedance input circuits; and (2) DC-DC converters, that is, self-exciting converters comprising; self-exciting oscillators which perform a self-excitation with a predetermined frequency determined by a circuit constant and a load; transformers which transform oscillation output produced by said self-exciting oscillators; rectification output blocks which produce output by rectifying the output from said transformers. - View Dependent Claims (19, 20)
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Specification