JPH01111365U - - Google Patents

Description

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a write/read control unit of an article identification system according to an embodiment of the data communication device of the present invention, FIG. 2 is a block diagram showing the overall configuration, and FIG. 3 is an ID unit. 4 is a time chart showing the waveforms of each part when transmitting a signal from the ID unit to the write/read control unit. Figure 5 is a time chart showing the waveform of each part when transmitting a signal from the ID unit to the write/read control unit. This is a time chart showing the waveforms of each part when transmitting. 1...Write/read control unit, 3...ID unit, 4...Control equipment, L1, L2, L3...
Coil, 11...Clock generator, 12...Time controller, 13...Transmission pulse generation circuit,
14... Reception gate signal generation circuit, 15... Oscillator, 17, 30... Resonance circuit, 19... Analog switch, 20, 31... Detection circuit, 22... Sample hold circuit, 23, 24, 33... Comparator, 25... Display drive circuit, 26... Light emitting diode, 34... Constant voltage circuit, 35... Clock discrimination circuit, 36... Counter, 37... Digital comparator, 38... Memory control unit, 39... ...Memory, 40...Residual control pulse generator, 41,4
2...FET, 43...Data demodulation means, 44...
...Reverberation control means.

Claims (1)

[Claims for Utility Model Registration] A data communication device that performs half-duplex data transmission of serial data between a write/read control unit and an ID unit, wherein the write/read control unit is opposite to the ID unit. an oscillator having a first coil provided on a surface that transmits data; a transmission pulse generating means that generates a transmission pulse signal with a certain period and intermittents the oscillation by providing the transmission pulse signal with a certain period to the oscillator; A first resonant circuit including a second coil provided on a surface facing the ID unit; and a signal corresponding to the transmission pulse of the transmission pulse generating means are applied to determine the timing when the oscillator stops oscillating. a first detection circuit that detects an electromagnetic induction signal obtained in the first resonant circuit while the reception gate signal of the reception gate signal generation means is applied; , a sample and hold circuit that samples the output of the detection circuit at a predetermined timing of the reception gate signal; a first comparator that discriminates the hold signal of the sample and hold circuit at a predetermined level to obtain a reception signal; a second comparator that discriminates the output at a predetermined threshold level; and a display means driven by the output of the second comparator, the ID unit: a second resonant circuit including a third coil having a resonant frequency substantially equal to the oscillation frequency of an oscillator of the control unit and provided on a surface facing the write/read control unit; a second detection circuit that detects a signal obtained in the circuit; a third comparator that obtains a transmission pulse signal by discriminating the output of the second detection circuit at a predetermined threshold level; /a data demodulating means for demodulating the transmitted data signal from the transmitted pulse signals of the first and second duty ratios based on the output of the third comparator when receiving data from the read control unit; and the second resonant circuit. oscillation of the oscillator based on a transmission pulse signal of a third duty ratio obtained from the third comparator during data transmission to the write/read control unit. 1. A data communication device comprising: reverberation control means for controlling reverberation generated in a second resonant circuit by turning on and off the switching element in accordance with transmission data at a stop timing.