JPH0425341U - - Google Patents

Description

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a data transmission device according to the present invention, and FIGS. 2 and 3 are signal waveform diagrams of data signals of the same data transmission device. In the figure, 1 is a data terminal device, 2 is a first conversion unit,
3 is a transmitter, 4 is a signal line, 5 is a circulator,
6 is a second conversion unit, 7 is a photocoupler circuit, 8 is a receiver, 10 is a diagram converted to a specific frequency, 11 is a diagram converted to a digital signal, 12 and 14 are H values of data signals, and 13 and 15 are L It is a value.

Claims (1)

[Scope of claims for utility model registration] (1) A data terminal device that transmits data signals;
a first conversion unit that converts the received data signal into a frequency; a transmission unit that transmits the converted frequency signal;
A signal line that transmits these frequency signals, a circulator that extracts one corresponding frequency signal from the transmission signal transmitted via the signal line, a second converter that converts the extracted frequency signal into a pulse signal, and a pulse signal. A data transmission device equipped with a receiving device that receives. (2) A plurality of the data terminal devices, the first conversion section, and the transmitting section are installed, and the data signals from each of the data terminal devices are converted to different frequencies, and the converted frequency signals are output from each of the transmitting sections. , a plurality of circulators for mixing the outputted plurality of frequency signals and transmitting the mixed signal via a signal line, and extracting a corresponding one frequency signal from the plurality of transmitted frequency signals; and a second conversion section for each circulator; Claim (1) comprising a receiving device
) data transmission device.