JPH06168192A - Printer terminal system for radio data communication - Google Patents

Abstract

PURPOSE:To enlarge communication coverage, to prevent wire tapping, and to improve a data quality by making it difficult to be affected by a transmission disturbance or interference due to other transmission signals or the like, and reducing the interference given to other transmission signals. CONSTITUTION:In a transmission side 11, a data signal is spread spectrum- processed by a direct sequence system by a spread spectrum processing circuit 12, FSK modulated by an FSK modulating circuit 13, and a weak radio wave signal suitable to an electric wave modulus is transmitted. In a reception side 21, the received weak radio wave signal is FSK-demodulated by an FSK demodulating circuit 23, then inverse spread spectrum-processed by the direct sequence system by an inverse spread spectrum processing circuit 24, and extracted as the data signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printer / terminal system for wireless data communication, and more specifically, to monetary data, medical data, technical / research data, confidential data between a personal computer and a printer requiring a high security function. The present invention relates to an improvement of a wireless printer terminal useful when used as a part of a wireless data communication such as data or a LAN (local area network).

[0002]

2. Description of the Related Art Generally, when it is necessary to transmit a data signal at high speed by this type of wireless communication, a wireless communication device of a specific low power format has been conventionally used and a buffer memory is provided inside the device. To improve the transmission efficiency. In addition, in the case of this type of wireless communication system, a wireless data communication system is known in which the electric field strength per frequency uses a relatively small weak electric wave within a range where a radio station license is not required under the Radio Law. .

[0003]

However, the conventional wireless data communication system using the wireless communication device having the buffer circuit therein has the following various problems. That is, a. The buffer memory is not always effectively used, and the transmission speed is relatively slow, b. The content of data communication is relatively easy to be tapped, c. Data quality may be degraded relatively easily due to interference from other communications, etc. d. The reach of radio waves is relatively wide (a radius of about 100
within a range of about m to 200 m), which easily interferes with other devices, e. Since the transmission output is relatively large (about 10 mW),
For example, it is easy to interfere with a production line of high-frequency related equipment (for example, image adjustment of a television / video production line) or a production line using a robot.

Therefore, the object of the present invention is to
It is an object of the present invention to provide a printer / terminal system for wireless data communication of this kind, which can solve the various problems of the related art.

[0005]

In order to achieve the above object, a printer / terminal system in wireless data communication according to the first aspect of the present invention is connected to a personal computer via a central control unit. And a data receiving unit connected to the printer. The data transmitting unit temporarily stores transmission data output from the personal computer of the own station, and the data receiving unit. For this, a common buffer memory for temporarily storing received data input from another station is provided and configured, and the printing process by the printer is terminated before the personal computer and the printer are connected by wire. It is characterized by having been obtained.

A printer / terminal system in wireless data communication according to a second aspect of the present invention includes a data transmission unit connected to a personal computer and a data connected to a printer via a central control unit. And a receiver, and for the data transmitter,
Temporarily stores the transmission data output from the personal computer of its own station, and for the data receiving unit,
A common buffer memory for temporarily storing received data input from another station is provided, and a switching means for connecting the personal computer and the printer to each other by wire or wirelessly is built in, and in the case of wire connection, the buffer is provided. It is characterized in that the data to be printed by the printer and the data to be transmitted can be simultaneously buffered in the memory.

Furthermore, a printer / terminal system in wireless data communication according to a third aspect of the present invention is
On the transmission side, the transmission data is spread spectrum processed by the spread spectrum processing circuit by the direct sequence method, and then FSK modulated by the FSK modulation circuit.
The weak radio wave signal conforming to the Radio Law is transmitted, and the receiving side demodulates the received weak radio wave signal by the FSK demodulation circuit and then the spectrum despreading circuit by the direct sequence spread spectrum processing by the spectrum despreading processing circuit. It is characterized in that it can be taken out as reception data.

[0008]

Therefore, according to the first aspect of the present invention, the data transmission section connected to the personal computer temporarily stores the transmission data output from the personal computer of the own station, and the data reception section connected to the printer. Since the common buffer memory for temporarily storing the received data input from another station is provided in the above configuration, the printing process by the printer can be completed before the personal computer and the printer are connected by wire.

Further, according to the second aspect of the present invention, the transmission data output from the personal computer of the own station is temporarily stored in the data transmission unit connected to the personal computer, and the data reception unit connected to the printer. Since a common buffer memory for temporarily storing received data input from another station is provided and a switching means for connecting a personal computer and a printer to each other by wire or wirelessly is built in, a buffer is used in the case of wire connection. The memory may allow data to be printed by the printer and data to be transmitted to be buffered at the same time.

Further, according to the third aspect of the present invention,
In each of the above configurations, on the transmission side, the transmission data is input to the spread spectrum processing circuit, and first the direct
After performing the spread spectrum processing using the sequence method, by continuously inputting the transmission data subjected to this spread spectrum processing to the FSK modulation circuit and performing FSK modulation, it is possible to transmit by a weak radio signal that complies with the Radio Law.
On the receiving side, the received weak radio wave signal is input to the FSK demodulation circuit, first FSK demodulated, and then input to the spectrum despreading processing circuit to perform spectrum despreading processing using the direct sequence method. As a result, the received data can be taken out.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a printer / terminal system in wireless data communication according to the present invention will be described below with reference to FIG.
It will be described in detail with reference to FIGS.

FIG. 1 is a circuit block diagram showing an outline of a circuit configuration of a wireless data communication system to which the present invention is applied, here, a spread spectrum communication system in wireless data communication, and FIG. 2 is a block diagram of the present invention. FIG. 4A is a circuit block diagram showing an outline of a circuit configuration of a wireless data communication device to which an embodiment is applied, FIG. 3 is an explanatory diagram showing an outline of an example of a printer / terminal system in the wireless data communication device of the same, FIG. 6A and 6B are operation explanatory diagrams showing modes of operations at the time of sending and receiving and at the time of local printing in the printer / terminal system.

First, in the wireless data communication system shown in FIG. 1, on the transmission unit 11 side, transmission data is transmitted by a direct sequence system (so-called DS system) by a spread spectrum processing circuit (hereinafter, referred to as a transmission side SS modem) 12. ) Is used to perform spread spectrum processing, and FSK
After the FSK modulation by the modulation circuit 13, the electric field strength per frequency is transmitted by a relatively small weak radio signal which does not require a license of a radio station under the Radio Law.
Send from

On the receiving section 21 side, the weak radio wave signal received by the receiving antenna 22 is FSK demodulated by the FSK demodulation circuit (detection circuit) 23, and a spectrum despreading processing circuit (hereinafter referred to as receiving SS modem). ) 24, the spectrum despreading process using the direct sequence method is performed, and then the received data is extracted.

Next, the wireless data communication device 31 to which this embodiment shown in FIG. 2 is applied has the transmitting section 11 and the receiving section 21.
C for controlling and operating each of these parts 11 and 21 including
The CPU has a PU (central control unit) 32
The section 32 includes a personal computer interface 33 connected to a personal computer (not shown) (not shown), a printer interface 34 similarly connected to a printer as an output terminal (not shown), and a transmitter / receiver. A buffer memory 35 for temporarily storing data is provided, and an operation display unit 36 and a power supply unit 37 are arranged therein.

Further, as shown in FIG. 3, a specific example of the printer terminal system in the wireless data communication apparatus in this embodiment is, in this case, a plurality of printer terminals TM1, TM2, for example. TM3
.., TMn in one system, each of which is a personal computer PC1, PC2, PC3, ..., PCn, and a printer (public setting) PR for each of the personal computers PC1, PC2, PC3 ,. , And a printer (local setting) PL are connected, and each is operated as follows.

That is, first, as shown in FIG. If the receiving terminal is waiting: In this case, the receiving terminal is monitoring the control channel and
When there is a call from the local station, a call response signal is transmitted through the control channel, the reception frequency is changed to enter the confirmation call waiting state, and a select signal L is output to the wired PC to output a boogie. Set the signal to H.

B. When the receiving terminal is linking with another station: In this case, the receiving frequency has been changed to the data channel and no response is made even if the control channel is called.

C. When the receiving terminal is inputting data from the personal computer and the control channel is being monitored:
In this case, the receiving terminal returns a deadlock signal on the control channel and continues to monitor the control channel.

Also, d. When the transmitting terminal receives a call response signal after transmitting a call signal, it moves to the data channel according to the call response instruction and transmits a confirmation call signal, and when a deadlock signal is received, The processes from a to c are repeated.

E. When the receiving terminal receives the confirmation call signal, it acknowledges that the link is possible and returns a confirmation response signal.

F. When the transmitting terminal receives the acknowledgment signal, it assumes that the link is possible and starts the data transmission process.

G. In any of the procedures from a to f, when a timeout occurs, the process from the beginning is repeated.

Next, taking local printing as an example, FIG.
As shown in (b), h. When there is a print input from the personal computer of your station to the printer of your station (regardless of public or local settings) during standby, the printing operation starts immediately and the control channel Even if there is a call signal from the own station, this is ignored.

I. When the previous data is being printed, the data of the own station is printed after the printing is completed.

Therefore, in the case of the apparatus of the above-mentioned configuration, since the buffer memory is provided, the open time between the personal computer and the printer can be shortened, and the personal computer and the printer can be connected by wire / wirelessly. Since it has a built-in change-over switch, it can effectively use the buffer memory in the case of a wired connection, and since it spreads the data and communicates it with weak radio waves, it has high security and is strong against interference from others and There is little interference, and the communicable distance is as low as specified low power (for example,
In the case of this embodiment, the range is approximately 100 m), and a bit error rate of 10 −6 can be easily realized, and the transmission speed can be increased.

[0027]

As described above in detail with reference to the embodiments,
According to the spread spectrum communication system of the present invention, the spread spectrum communication system has a data transmission section connected to a personal computer and a data reception section connected to a printer. Since a common buffer memory for temporarily storing the output transmission data and temporarily storing the reception data input from another station is provided for the data receiving unit, the personal computer and the printer can be opened. The time can be shortened and the printing process by the printer can be completed before the wired connection between the personal computer and the printer, and in this configuration, the wired or wireless connection can be established between the personal computer and the printer. In the case of wired connection, it has a built-in switching means to connect. There are, in the buffer memory, the data to be printed in the printer, there is an advantage that the data to be transmitted simultaneously can be buffered.

Further, in this configuration, the transmission data is input to the spread spectrum processing circuit, is subjected to spread spectrum processing using the direct sequence method, and is then input to the FSK modulation circuit to perform FSK modulation. The weak radio signal that complies with the Radio Law is transmitted, and the received weak radio signal is input to the FSK demodulation circuit,
After FSK demodulation, the signal is input to the spectrum despreading processing circuit and subjected to spectrum despreading processing using the direct sequence method so that it is taken out as received data. In addition, despite using a relatively small weak radio signal that does not require a license of a wireless station, high security,
It is possible to easily realize a communication range as low as a specific low power and a low bit error rate, and it is possible to relatively reduce the interference given to other transmission signals. At the same time, the entire circuit configuration is simple and economical. Can exhibit excellent characteristics such as having sufficient practicality.

[Brief description of drawings]

FIG. 1 is a circuit block diagram showing an outline of a circuit configuration in a spread spectrum communication system in wireless data communication to which the present invention is applied.

FIG. 2 is a circuit block diagram showing an outline of a circuit configuration in a wireless data communication device to which an embodiment of the present invention is applied.

FIG. 3 is a configuration explanatory diagram showing an outline of an example of a printer / terminal system in the wireless data communication device.

4 (a) and 4 (b) are operation explanatory views showing modes of operations at the time of sending / receiving and at the time of local printing in the printer / terminal system.

[Explanation of symbols]

11 Transmitter 12 Spread Spectrum Processing Circuit (Transmission Side SS Modem) 13 FSK Modulation Circuit 14 Transmission Antenna 21 Reception Section 22 Reception Antenna 23 FSK Demodulation Circuit (Detection Circuit) 24 Spread Spectrum Processing Circuit (Reception Side SS Modem) 31 Radio Data Communication device 32 CPU unit (central control unit) 33 Personal computer interface 34 Printer interface 35 Buffer memory 36 Operation display unit 37 Power supply unit TM1, TM2, TM3, ..., TMn printer terminal PC1, PC2, PC3. , PCn Personal computer PR printer (public setting) PL printer (local setting)

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Reference number within the agency FI Technical indication location H04L 29/12 (72) Inventor Kazuo Yoshida 3-6 Tsukioka-cho, Toyama City, Toyama Prefecture Tateyama Science & Technology Co., Ltd. In-company (72) Kaoru Ikeya 3-6 Tsukioka-cho, Toyama-shi, Toyama Tateyama Science & Technology Co., Ltd. (72) In-house Sada Toi 3-6 6 Tsukioka-cho, Toyama, Toyama-ken

Claims (3)

[Claims] 1. A data transmission unit connected to a personal computer and a data reception unit connected to a printer, each of which is connected via a central control device. Temporarily stores the transmission data output from the personal computer, and
A common buffer memory for temporarily storing received data input from another station is provided for the data receiving unit, and print processing by the printer is performed before the personal computer and the printer are connected by wire. A printer / terminal system in wireless data communication, characterized in that it can be terminated. 2. A data transmission unit connected to a personal computer and a data reception unit connected to a printer, each of which is connected to a personal computer via a central control unit. A common buffer memory for temporarily storing transmission data output from a personal computer, and temporarily storing reception data input from another station is provided for the data receiving unit, and a data buffer between the personal computer and the printer is provided. The wireless communication device is configured to have a built-in switching means for connecting to a wired or wireless connection, and in the case of the wired connection, data to be printed by the printer and data to be transmitted can be simultaneously buffered in the buffer memory. Printer / terminal system for data communication. 3. On the transmitting side, after the transmission data is subjected to spread spectrum processing by a spread spectrum processing circuit by a direct sequence method, it is FSK modulated by an FSK modulation circuit and transmitted by a weak radio wave signal conforming to the Radio Law. On the receiving side, the weak radio wave signal to be received is FSK demodulated by the FSK demodulation circuit, and then the spectrum despreading circuit is subjected to spectrum despreading processing by the direct sequence method so that it can be taken out as received data. Printer / terminal system for wireless data communication.