JPH0653934A - Portable input and output device - Google Patents

Abstract

PURPOSE:To improve an operability or the reliability of communication. CONSTITUTION:A CPU 1 outputs inside data through an interface circuit 3 to a parallel/serial converter 4, and the parallel/serial converter 4 converts the data into serial data. A frequency modulating circuit 6 frequency-modulates a certain carrier by the serial data. An optical signal conversion circuit 8 converts the signal frequency-modulated by the frequency modulating circuit 6 into an optical signal, and transmits it to another side device as optical transmission data 10. An optical signal receiving circuit 9 converts optical reception data 11 transmitted from the other side device into an electric signal. A frequency demodulating circuit 7 demodulates the serial data transmitted from the other side device. A serial/parallel converter 5 converts the serial data demodulated by the frequency demodulating circuit 7 into parallel data, and the data are transmitted through the interface circuit 3 to the CPU 1.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a portable input / output device, and more particularly to a portable input / output device for performing serial data communication.

[0002]

2. Description of the Related Art Conventionally, a portable input / output device is shown in FIG.
As shown in, the data from the CPU 1 provided inside is output to the parallel-serial converter 4 via the interface circuit 3, converted into serial data by the parallel-serial converter 4, and the RS-232-C interface 12 and Cable 14 compliant with RS-232-C standard, etc.
Data is transmitted through.

The cable 15 and RS-232-
The data received through the C interface 13 is converted into parallel data by the serial / parallel converter 5 and output to the CPU 1 and the memory 2 via the interface circuit 3.

In such a conventional portable input / output device,
When performing serial data communication, always use cables 14 and 1
It is necessary to connect to a partner device (not shown) by means of 5, and there is a problem that operability is not good due to the means of connecting a cable during communication. In addition, there is a problem that the connector for connecting the cable has a physical life, and it cannot be said that it is strong in reliability and environment resistance.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to eliminate the above-mentioned problems of the conventional one, and an object of the present invention is to provide a portable input / output device capable of improving operability and communication reliability. .

[0006]

A portable input / output device according to the present invention comprises a converting means for converting internal information to be transmitted to a destination into serial data, a modulating means for frequency-modulating the serial data, and an output of the modulating means. An optical signal converting unit for converting the signal into a signal and outputting the signal to the outside, an electric signal converting unit for converting an optical signal received from the outside into an electric signal, a demodulating unit for frequency demodulating the electric signal, and an output of the demodulating unit. And means for converting into the internal information.

[0007]

An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. In the figure, a CPU 1 is connected to a memory 2 in which programs and data are stored and an interface circuit 3.

When the CPU 1 attempts to output internal data to the outside by serial data communication, the CPU 1 outputs the internal data to the parallel / serial converter 4 via the interface circuit 3. Parallel-to-serial converter 4
Converts the parallel internal data into serial data, and outputs the serial data to the frequency modulation circuit 6.

The frequency modulation circuit 6 frequency-modulates a certain carrier wave with the serial data from the parallel-serial converter 4. The signal frequency-modulated by the frequency modulation circuit 6 is converted into an optical signal by the optical signal conversion circuit 8 and transmitted as optical transmission data 10 to a partner device (not shown).

On the other hand, when the CPU 1 tries to receive data from the outside by serial data communication, the optical signal reception circuit 9 receives the optical reception data 11 sent from the partner device.
To receive by. The optical signal receiving circuit 9 receives the optical receiving data 1
1 is converted into an electric signal and output to the frequency demodulation circuit 7.

The frequency demodulation circuit 7 demodulates the electric signal from the optical signal reception circuit 9, that is, the serial data sent from the partner device. The serial data demodulated by the frequency demodulation circuit 7 is input to the serial / parallel converter 5, converted into parallel data by the serial / parallel converter 5, and then transmitted to the CPU 1 via the interface circuit 3.

Optical transmission data 10 and optical reception data 11
By using different frequencies for the optical carrier of the light, the transmission and reception signals are not disturbed. As a result, the conventional serial data communication using electric signals can be changed to serial data communication using optical signals.

As an example of a concrete carrier wave, the optical transmission data 10 is 2.8 MHz and the optical reception data 11 is 2.3 MH.
z, and digital data can be transmitted and received by frequency modulation.

The transmission speed of data to be transmitted and received is 38.4 KBPS or 76.8 KBPS,
It is technically possible to achieve even higher speeds.
In this serial data communication, it is possible to change the speed (baud rate) between transmission and reception, and it is possible to select the communication speed suitable for the application. For example, when operating on a battery, it is necessary to shorten the communication time, so high speed is selected.

As described above, the data from the CPU 1 is converted into serial data by the parallel-serial converter 4, the frequency modulation circuit 6 frequency-modulates a fixed carrier wave, which is the serial data, and the output of the frequency modulation circuit 6 is optically converted. The signal conversion circuit 8 converts it to an optical signal and outputs it as the optical transmission data 10 to the outside, and the optical reception data 11 received from the outside is converted into an electric signal by the optical signal reception circuit 9, and this electric signal is demodulated in the frequency demodulation circuit. By demodulating in 7 and converting it into parallel data in the serial-parallel converter 5 and transmitting it to the CPU 1, a cable for conventional serial data communication is not required, so that operability and communication reliability can be improved. it can.

Further, if the serial data communication is performed by the optical signal during the operation of the portable input / output device, the operation by the real-time communication becomes possible, and the wider operation as the system becomes possible.

[0018]

As described above, according to the present invention, the internal information to be transmitted to the destination is converted into serial data, and the output of the modulation means for frequency-modulating this serial data is converted into an optical signal for external use. It is said that the operability and the reliability of communication can be improved by converting the optical signal received from the outside and converting the optical signal received from the outside into an electric signal, frequency demodulating the signal, and converting the frequency demodulated signal into internal information. effective.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a conventional example.

[Explanation of symbols]

 1 CPU 4 parallel-serial converter 5 serial-parallel converter 6 frequency modulation circuit 7 frequency demodulation circuit 8 optical signal conversion circuit 9 optical signal receiving circuit 10 optical transmission data 11 optical reception data

Claims (2)

[Claims] 1. A conversion means for converting internal information to be transmitted to a destination into serial data, a modulation means for frequency-modulating the serial data, and a light for converting the output of the modulation means into an optical signal and emitting it to the outside. Provided are signal conversion means, electric signal conversion means for converting an optical signal received from the outside into an electric signal, demodulation means for frequency demodulating the electric signal, and means for converting the output of the demodulation means into the internal information. A portable input / output device characterized in that 2. The portable input / output device according to claim 1, wherein a carrier frequency of the optical signal emitted to the outside and a carrier frequency of the optical signal received from the outside are different from each other. .