JPH05336072A - Data transmitter-receiver for spread spectrum communication - Google Patents

Abstract

PURPOSE:To provide the output data transmitter-receiver for spread spectrum communication which has an inexpensive constitution and can communicate data at a high speed and is superior in secrecy of data with respect to radio data communication where output data is transmitted from the data processor side and is received on the data output device side. CONSTITUTION:A data transmitter 2 is connected to a computer C and modulates print data, control data, etc., from the computer C as a spectrum spread signal and transmits them through an antenna 280. The data transmitter 2 demodulates the reception signal by spectrum spread and takes out control information indicating the state of a printer P to send it to the computer C. Meanwhile, a data transmitter 3 is connected to the printer P and receives an SS signal from a data reception equipment through an antenna 380 and takes out print data and a print request by spectrum spread demodulation to send them to the printer P. The data transmitter 3 modulates control information indicating the state of the printer P as the SS signal and transmits it to the data transmission equipment 2 through the antenna 380.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to the transmission and reception of data,
In particular, the spread spectrum communication device connected to the data processing device such as a computer transmits the output data of the data processing device and the spread spectrum communication device connected to the data output device such as a printer receives the output data. The present invention relates to a data transmission / reception device using spread communication.

[0002]

2. Description of the Related Art Data processed by a data processing device such as a computer is usually stored in a storage device, or is output from an output device in a print format or in a screen display format, and is displayed in a character, a figure or an image, or a combination thereof. It is output and used as visual information. For example, as shown in FIG. 12, a data processing device 1 using a computer
2, the data input from the input device 122 or the data read from the mass storage device 123 is processed by the CPU 121, and the mass storage device 123
Or stored in the printer or visually output or displayed on an output device such as the printer 124 or the display 125. In this case, normally, the CPU 121 and the output device are connected by a bus or a cable, and the data sent from the CPU 121 is temporarily stored in a buffer memory (not shown) of the output device side, and then a predetermined value is stored. It is taken out for each data length and sequentially printed or displayed. Also, a plurality of data processing devices may share one output device, and vice versa.

In such a data processing device, a CPU
If the output data can be sent from the CPU side to the output device side wirelessly without the cable connecting the side and the output device side,
For example, a cable with a limited length is typified by office automation equipment such as offices, or a work is performed by going to a predetermined place in order to output an output form or a document. Since only the output result is needed, even a department that has a data output device such as a printer can provide OA.
It is possible to eliminate the situation where a set of equipment occupies a desk. Further, even when the department is changed or the processing device is moved, the construction cost can be reduced because the cable wiring is small, and the simultaneous transmission from the processing device can be easily performed without a wired network.

As a conventional technique, a wireless LAN as shown in FIG. 13 is known. This is 1 for the output of multiple computers 131-1, 131-2, 131-3.
It is a so-called printer buffer that can allocate and share one printer 134, and outputs (print data) from the respective computers 131-1, 131-2, 131-3 to the wireless modems 132-1 and 132-2. ，
132-3 FM-modulates and transmits the
This is a system for receiving by the wireless modem 133 on the side, FM demodulating and printing. Also, in a form similar to this,
As a wireless version of the data logger, there is one that wirelessly collects data from various calendar machines.

On the other hand, as a communication system, there is a spread spectrum communication system (hereinafter referred to as SS communication system) which is superior in anti-jamming property, fading property, confidentiality and concealment compared to other communication systems. Generally, it is rarely used, and narrow band FM communication is also used in the above-mentioned wireless LAN and data logger.

[0006]

However, the conventional wireless LAN is only used for printing / collecting simple data via the wireless modem as described above, and such a usage method is used for computer printing. Although the time was shortened, there was a serious drawback in use that the execution transmission rate at which data was transmitted to the printer body was slow.Because a data processing device such as a computer is used indoors,
In general, because of poor radio wave propagation conditions in narrow band FM communication systems, etc. due to indoor installations and room structure, etc., in order to perform high-speed data transmission and to compensate for the above-mentioned delay in execution transmission speed, the computer side The printer has a built-in large-capacity memory, which causes inconveniences such as large-scale structure and high device cost when high-speed data transmission is performed. It was Further, in order to maintain the confidentiality of data in the narrow band FM communication system, there is a drawback that the transmission / reception device becomes complicated or the load of software on the computer side and the printer side increases.

The present invention has been made in view of the above drawbacks and inconveniences, and in wireless data communication in which output data is transmitted from the data processing device side and received by the output device side,
It is an object of the present invention to provide a data transmission / reception device by spread spectrum communication that is capable of high-speed data communication with an inexpensive configuration and is excellent in data confidentiality.

[0008]

In order to achieve the above object, a data transmitting / receiving apparatus as a first invention of the present invention comprises:
A first transmitter connected to the data processing device to spread-spectrum-modulate and transmit the output data and control data of the data processing device; and a first receiver to spread-spectrum demodulate a received signal to obtain control information. And a second receiver connected to the data output device, which spread spectrum demodulates the received signal to extract output data and control data of the data processing device and sends the control data to the data output device.
A data receiver having a second transmitter for performing spread spectrum modulation and transmission of control information of the data output device;
It is characterized by consisting of.

Further, a data transmitting apparatus as a second invention of the present invention, an antenna, an interface for connecting to an external device to transfer data, and a transmission data from the external device obtained through the interface are temporarily stored. Memory for transmission data to be stored in memory, a spread spectrum transmitter for performing spread spectrum modulation on the transmission data and transmitting the same, a spread spectrum receiver for performing spread spectrum demodulation on the received signal to obtain the received data, and temporarily receiving the received data. And a control unit for controlling at least the interface, the transmission data memory, the spread spectrum transmitter, the spread spectrum receiver, the reception data memory, the antenna, the spread spectrum transmitter and the spread spectrum receiver. And a connection switching means for sharing with To.

Further, a data receiving apparatus as a third invention of the present invention, an antenna, an interface for connecting to a data output apparatus for transferring data, and spread spectrum demodulation of a received signal to obtain received data. A plurality of spread spectrum receivers, a reception data memory for temporarily storing the reception data, a transmission data memory for temporarily storing the transmission data from the data output device obtained through the interface, and the transmission data A spectrum transmitter for performing spread spectrum modulation and transmitting, and a control unit for controlling at least the interface, each spread spectrum receiver, reception data memory, the transmission data memory and the spread spectrum transmitter,
It is characterized by comprising a connection switching means for sharing the antenna between the spread spectrum transmitter and each spread spectrum receiver.

Further, the data receiving apparatus further includes signal dividing means for dividing the carrier wave of the received input signal, and a plurality of spread spectrum receivers are provided on one of the channels obtained from a predetermined spread signal from the divided signals. It is desirable to select one to receive the signal.

[0012]

With the above structure, in the data transmitting / receiving apparatus as the first invention, the data transmitting apparatus transmits the control data from the data processing apparatus by spread spectrum modulation by the first transmitter, and transmits the control data from the data receiving apparatus. The second receiver spread-spectrum demodulates the received signal, extracts the control data from the data processing device, and sends it to the output device, and the second transmitter spread-spectrum-modulates the control information of the data output device and sends it. Then, the data transmitting apparatus spread-spectrum demodulates the received signal by the first receiver, extracts control information of the data output apparatus, and spread-spectrum-modulates the output data from the data processing apparatus by the first transmitting apparatus by the value. To send.

Further, in the data transmitting apparatus as the second invention, the transmission data memory temporarily stores the transmission data from the external device, and the spread spectrum transmitter transmits the transmission data by performing spread spectrum modulation. A spread spectrum receiver spread spectrum demodulates the received signal to obtain received data. Then, the reception data memory temporarily stores the reception data. The control unit controls the interface, the transmission data memory, the spread spectrum transmitter, the spread spectrum receiver, and the reception data memory. The communication band is switched by the connection switching means, and the antenna is shared by the spread spectrum transmitter and the spread spectrum receiver.

Further, in the data receiving apparatus as the third invention, the spread spectrum receiver spread-spectrum demodulates the received signal to obtain the received data, and the received data memory temporarily stores the received data, The spread spectrum transmitter spread-spectrum-modulates and transmits the transmission data indicating the state of the output device, and the control unit includes at least the interface, the spread spectrum receiver, the received data memory, the transmission data memory, and the spread spectrum transmitter,
To control. Then, the connection is switched by the connection switching means and the antenna is shared by the spread spectrum transmitter and each spread spectrum receiver. Further, the data receiving device divides the carrier wave of the received signal by the signal dividing means, and the plurality of spread spectrum receivers select one of the channels obtained by the predetermined spread code from the divided signals and receive the signal. You can also do it.

[0015]

1 is a conceptual diagram showing an embodiment of an output data transmitting / receiving apparatus by spread spectrum communication as a first invention based on the present invention. In FIG. 1, C is a computer as a data processing device, 2 is a data transmission device, and 3 is a data transmission device.
Is a data receiving device, 280 and 380 are transmitting / receiving antennas, and P is a printer as a data output device.

In FIG. 1, data transmission devices 2-1 and 2-1 are provided.
-3 is connected to the computer C and modulates print data, print request (control data), etc. from the computer C as an SS (spread spectrum) signal, and antennas 280-1 to 280-2.
80-3. In addition, the data transmission device 2 receives the SS signal from the data reception device 3 via the antenna 280, performs spread spectrum demodulation, and controls information indicating the state of the printer P (for example, during printing, out of paper, printable, etc.). Is taken out and sent to the computer C. On the other hand, the data receiving device 3 is connected to the printer P, receives the SS signal from the data transmitting device 2 via the antenna 380, performs spread spectrum demodulation, extracts print data and a print request, and sends them to the printer P. Further, the data receiving device 3 modulates the control information indicating the state of the printer P as an SS signal to the data transmitting device 2 and the antenna 38.
Send through 0.

FIG. 2 is a block diagram showing the configuration of an embodiment of the data transmitting apparatus as the second invention. In FIG. 2, reference numeral 2 is the entire data transmission apparatus, 200 is an interface for connecting and receiving data to and from an external device, 210 is a memory for temporarily storing transmission data from the external device, 2
Reference numeral 20 is an SS (spread spectrum) transmitter as a first transmitter that spread-spectrum-modulates and transmits the data, and 230 is a duplexer as a band switching means.
Reference numeral 250 denotes an SS (spread spectrum) receiver as a first receiver for performing spread spectrum demodulation of a received signal to extract data, 260 a memory for temporarily storing the extracted received data, 270 for an SS transmitter 220, The controller is a controller that controls the SS receiver 250, the memories 210 and 240, and the interface 200. A Centronics interface (standard) is generally used as the interface. In addition, the SS transmitter 220 and the receiver 250 use the PN at the time of transmission.
The sign can be set freely. And the duplexer 23
At 0, the SS transmitter 230 and the SS receiver 250 share the antenna 280. In this case, the controller 270 sends the duplexer switching signal to the duplexer circuit 230 in synchronization with the transmission timing. Then, the duplexer circuit 230 switches the connection by the duplexer switching signal.

FIG. 3 is a block diagram showing the configuration of an embodiment of a data receiving apparatus according to the third invention. In FIG. 3, 3 is the entire data receiving device, 300 is a printer interface for connecting to a printer to transfer data, and 310 is transmission data (status data) from the printer.
Is a memory for temporarily storing the S, and 320 is a second transmitter for transmitting the data by spread spectrum modulation.
S transmitter, 330 is a duplexer, 340 is a power splitter as signal dividing means, 351, 352, 35
Reference numeral 3 denotes an SS receiver as a second receiver for extracting the received data by performing spread spectrum demodulation on the received signal, respectively.
Reference numerals 61, 362 and 363 denote memories for temporarily storing the retrieved reception data, and 360 denotes an SS transmitter 320, SS.
Receivers 351-353, memories 210, 241-243
And a controller as a control unit for controlling the printer interface 300. Generally, a Centronics interface (standard) is often used as the printer interface, and an RS-232C (standard) serial interface may be used.
Furthermore, the SS transmitter 220 and the receiver 250 are
The N code can be set freely. And Duplexer 3
30 SS transmitter 320 and SS receivers 351 to 35
3 shares the antenna 380. In this case, the controller 270 sends the duplexer switching signal to the duplexer circuit 230 in synchronization with the transmission timing. Then, the duplexer circuit 230 switches the connection by the duplexer switching signal. In addition, the data receiving device 3
Divides the carrier wave of the received signal by the power splitter 340. Then, the SS receivers 351 to 353 select one of the channels obtained by a predetermined spreading code from the divided signals as described later and receive the signals.

1. Transmission / Reception of Print Data FIG. 4 is a timing chart showing an example of the flow of data in this apparatus. The flow of transmission / reception data in this device will be described below with reference to FIGS.

[Step 11] Print Request The data transmission device 2-1 uses the print request (control data) from the computer C1 for the printer P as an SS signal.
Then, the data receiving device 7 receives the SS signal, takes out the print request from the computer C1 to the printer P, and sends it to the printer P.

[Step 12] Print Permission Response The printer P checks the status bit and, if printing is possible, accepts the print request from the computer C1 and responds (permits) to the computer C1. In this case, the printer P sends the control information (printable) to the data receiving device 7, and the data receiving device 7 sends them as an SS signal.

[Step 13] Transmission of print data The data transmission device 2-1 receives the SS signal, extracts the control information from the SS signal, and outputs the control information to the computer C1.
To send to. The computer C1 determines whether or not the value of the control information is "printing permitted", and when it is "printing permitted", the print data is sequentially transmitted by the data transmitting device 2-1 as an SS signal.

[Step 14] Response from Printer The printer P transmits the transmission status data (SS signal) of each data to the data transmitting device 2-1 as control information via the data receiving device 7. When the print data is normally transmitted, the control information that means normal reception is continuously transmitted.

[Step 15] Transmission of Print Data While the control information indicating normal reception is transmitted from the data receiving device 7, the computer C1 sends the print data to the data transmitting device 2-1 until the print data is completed. To send over.

[Step 16] Interrupt Normally, data is delivered as in step 15. However, during the transmission of print data from the computer C1 to the printer 8, for example, a print request (control data) is also sent from C2. If it is issued, parallel processing is performed as follows.

[Steps 18, 20, 22] Parallel Processing As one of the interrupt processing methods, if this apparatus has a plurality of channels capable of simultaneously communicating (described later), as shown in Steps 18, 20, 22. To the data transmitter 2-2
As in steps 11 to 15, the data receiving device 7 determines the status data (print permission response), print data transmission, and control information (normal reception response) so that the data transmitting device 2-2 can be used by another computer (for example, the computer C1). ) And the data receiving device 7 regardless of the communication state of the printer P.

[Steps 17, 19, 21] In this case, the data transmitting device 2-1 and the receiving device on the printer P side also perform print data transmission / reception processing in parallel. As described above, the data transmitting device 2 does not need a large-capacity storage device because the waiting time is eliminated when outputting the print data.
Also, the time required for printing can be saved. In this way, the load on the data transmission device (as shown in FIG. 2) can be lightened and the price of the data transmission device can be suppressed. Therefore, when using this device, it is necessary to provide a data transmission device for each computer. The burden on the user can be reduced. The capacities of the memories 210 and 340 shown in FIG. 2 are the same as those of the computer C and the SS transmitter 220 (or SS).
It is for absorbing (buffering) the difference in operation speed between the receivers 250), and a small capacity is sufficient.

2. Data transmission in data transceiver
Specific Operation of Device and Data Receiving Device The operation of the data transmitting device and the data receiving device which enables the print data transmitting / receiving operation in the data transmitting / receiving device according to the above 1 will be described below. However, in the following description, it is assumed that the following items (1) to (4), which are well known to those skilled in the art as an electronic engineer, are defined. The description of these items is omitted.
In addition, in the present embodiment, not all the following items are necessary, and some items may be optionally added.

(1) A communication method in which communication data is packetized and transmission / reception data is transmitted / received in packet units. (2) Access method for packet transmission (3) Protocol for data communication (4) Wireless data error detection and error correction procedure

2-1. Channels in SS communication device
For the channel division in the split SS communication device (the data transmission device 2 and the data reception device 3 in this embodiment), CDMA (Co
de Division Multiple Access). CDMA is S
This is a method of dividing a communication channel by a PN code used during S communication. In the present embodiment, the above-mentioned [Step 18,
20 and 22], the communication channel is divided into a common channel and a plurality of data channels by a PN code by the CDMA method.

First, a common channel is used for transmitting control data such as a print request as represented by step 11 in FIG. 4 and a packet of control information used for confirming the print state. The data transmitter 2 of FIG. 2 uses the SS transmitter 22 so that the common channel is used at the start of printing.
The PN code used in 0 is selected, and a print start request is issued to the data receiving device 3. The data receiving device 3 uses one of the plurality of SS receivers 351 to 353 as a common channel SS receiver and a plurality of transmitters 2-1, 2-2, 2-
3 (see FIG. 1). When the data receiving device 3 receives the print start request from the data transmitting device 2, after judging whether the request is possible or not, the SS transmitter 320 sends a response (print permission, print disable, etc.) from the common channel. Then, when the transmission of the print data is permitted, the SS transmitter 320 of the data receiving device 3 specifies the channel to be used for the data transmitting device 2.

The print data is then transmitted using the data channel. In the data transmission device 2, the print data output from the computer C is packetized, and P corresponding to the channel number designated by the SS transmitter 320 is packetized.
Transmission of print data is started by the N code. The data receiving device 3 causes one of the SS receivers 351 to 353 to receive the print data by the PN code corresponding to the data channel number previously designated by the transmitter 320. After the transmission of all the print data is completed, the print completion packet is transmitted again from the transmitter 320 of the data receiving device 3 through the common channel. As a result, the data receiving device 3 finishes the print data receiving operation and can use the used data channel for receiving the next print data.

The data receiving device 3 shown in FIG. 3 is equipped with three receivers 351, 352, 353. According to this configuration, even when a packet for print data transmission is being transmitted / received between a data transmission device A and the data reception device 3, a print start request from another data transmission device B is accepted. At the same time, print data can be received from a plurality of data transmission devices. The print data received from multiple data transmission devices is stored in the memory according to the receiving source,
Alternatively, they are stored in different areas of the same memory (in FIG. 3, different memories 361, 362 and 363 are used, but one memory is provided and the SS receivers 351, 352 and 353 have different heads from each other). You may set the address point). This is to identify a plurality of print data when sending the print data received to the printer P. In this way, the channel division method of the present embodiment is an operation mode that makes full use of CDMA in the SS communication method. In the present embodiment, each data channel is not dedicated to a specific data transmission device and can be used by any data transmission device, and is used by a transmission start request from the transmission device from a vacant data channel. Further, the SS receiver of the receiving device is composed of at least two.

2-2-1. Control of data transmission device 2
Operation of Controller 270 FIG. 5 is a flowchart showing the basic operation of the controller 270 of the transmitter 2 of FIG.
In steps 51 to 59 below, the print data from the computer C is packetized and transmitted to the receiving device 3, and the packet received from the receiving device is decomposed and the state of the printer P is sent to the computer C.

[Steps 51-53] Initial Settings All internal memories of the transmitter 2 are set to known states (step 51), and the SS transmitter 220 and the SS receiver 2 are set.
The PN code of 50 is set to PN1 (steps 52 and 5).
3).

[Step 54] Judgment of Presence / Absence of Transmission Packet to be Transmitted to Receiving Device 3 It is judged whether or not there is a transmission packet. If there is a transmission packet, step 55 is executed, and if there is no transmission packet, step 58 is executed. ..

[Step 55] Determining Whether Transmission is Possible The transmitting device 2 transmits a print request (control data), obtains a response (control information) from the receiving device 3, and determines whether transmission is possible. If the response from the receiving device 3 is transmittable (printable), steps 56 and 57 are executed. If the response from the receiving device 3 is untransmittable (printing, print cancel, transmission data reception cancel, etc.). Step 58 is executed.

[Steps 56 and 57] Transmission processing The transmission packet is output from the memory 210 to the SS transmitter 220, SS-modulated by the SS transmitter 220, and then the packet is transmitted. After the transmission, the control is transferred to step 58.

[Step 58] Determination of Presence / Absence of Received Packet from Receiving Device 3 It is determined whether or not a receiving packet is received from the receiving device 3, and if there is a receiving packet, the receiving packet processing means of Step 59 (see FIG. 6) is used. After executing, the process returns to step 54. If there is no received packet, the process directly returns to step 54.

2-2-2. The received packet processing means
Operation of Controller 270 FIG. 6 is a flowchart showing the operation of the controller 270 in the received packet processing means of FIG. The reception packet processing means processes the reception packet received by the SS receiver 250 from the reception device 3. SS receiver 250
Since the received packet received in step 1 uses a common channel, it includes control information on the receiving device 3 side.

[Step 60] Control information (state confirmation)
Judgment as to whether or not it is a packet It is judged whether or not the received packet is a packet of control information whose contents are the status confirmation of the printer P (type of packet). If the packet is a control information packet whose contents are status confirmation, steps 61 and 62 are executed, otherwise step 63 is executed.

[Steps 61, 62] Transmission of Status Confirmation Information The status of the printer P is confirmed, and the status confirmation information is transmitted to the computer C via the interface 200, as shown in FIG.
Return to step 54 of.

[Step 63] Control information (print permission)
It is determined whether the received packet is a control information packet having print permission as its content. If the packet is a control information packet having print permission as its content, step 64 is executed, and if not, step 65 is executed. To do.

[Step 64] Setting of transfer enable flag The transfer enable flag is set, and the process returns to step 54 of FIG.

[Step 65] Judgment as to whether or not Print End Packet It is judged whether or not the received packet is a packet of control information containing the content of print completion, and if the packet is a packet of control information containing the content of print completion, a step is carried out. 66 to 68 are executed, otherwise the received packet is discarded in step 69, and the process returns to step 54 in FIG.

[Steps 66 to 68] Transmission of print end information A print data transfer disable flag is set (step 66),
The state of the printer P is confirmed (step 67), the print end information is sent to the computer C via the interface 200 to the computer C (step 68), and the process returns to step 54 of FIG.

2-3-1. Control of data receiving device 3
Operation of Controller 370 FIG. 7 is a flowchart showing the basic operation of the controller 370 of the receiving apparatus 3 of FIG.
Sends the print data from the transmission device 2 to the printer P by the following steps 70 to 79, while packetizing the control information received from the printer P and transmitting it to the transmission device 2.

[Steps 70 to 74] Initial Settings All internal memories of the receiving device 3 are set to known states (step 70), and the SS transmitter 320 and the SS receiver 3 are set.
The PN code of 51 is set to PN1 (steps 71 and 7).
2), set the PN code of the SS receiver 352 to PN2 (step 73), and set the PN code of the SS receiver 353 to PN.
Set to 3 (step 73).

[Step 75] Determination of Presence / Absence of Transmission Packet to be Transmitted to Transmitting Device 2 It is determined whether or not there is a transmission packet. If there is a transmission packet, steps 76 and 77 are executed. If there is no transmission packet, step 78 is performed. Run.

[Steps 76, 77] Transmission Processing A transmission packet is output from the memory 310 to the SS transmitter 320, SS-modulated by the SS transmitter 320, and then the packet is transmitted. After the transmission, the control is transferred to step 78.

[Step 78] Judgment of Presence / Absence of Packet Received from Transmitting Device 2 It is judged whether there is a packet received from the receiving device 3, and if there is a received packet, the received packet processing means (1, 2 or 3) of the step 79. (See FIG. 8)) and execute step 75.
Return to step, if there is no received packet, just step 7
Return to 5.

2-3-2. In the received packet processing means 1
Operation of Controller 370 FIG. 8 is a flowchart showing the operation of the controller 370 in the received packet processing means 1 of FIG. In the received packet processing, the transmitter 2 received by the SS receiver 351
Process received packets from. Since the received packet received by the SS receiver 351 uses the common channel, the control data on the transmitter 2 side is included.
Therefore, control such as printer status confirmation, print start request, and print data end notification is performed.

[Step 80] Judgment as to Whether or Not Control Data (Status Confirmation) Packet It is judged whether or not the received packet is a control data packet whose content is to confirm the status of the printer P. If the packet is a control data packet whose contents are status confirmation, steps 81 and 82 are executed, otherwise step 83 is executed.

[Steps 81, 82] Transmission of Status Confirmation Information The status of the printer P is confirmed (step 81), a response packet containing the status confirmation (control information) is created and stored in the memory 310 (step 82). ), Step 7 of FIG.
Return to 5.

[Step 83] Judgment of control data (print request) It is judged whether the received packet is a control data packet having a print request as a content. If the packet is a control data packet having a print request as a content, a step is carried out. 84-86 are executed, otherwise step 87 is executed.

[Steps 84-86] Determining Whether Data Receiving is Possible It is determined whether the receiving device 3 can receive data (step 84). If data can be received, a print permission response packet is created in step 85. After storing in the memory 310, the process returns to step 75 of FIG. Otherwise, after creating a print disable response packet and storing it in the memory 310,
Returning to step 75 of FIG.

[Step 87] Judgment as to whether or not the received packet is a print data end packet It is judged whether or not the received packet is a packet of control data containing the end of print data, and the packet is a packet of control data containing the end of print data. If so, steps 88 and 89 are executed; otherwise, the received packet is discarded at step 90 and the process returns to step 75 in FIG.

[Steps 88 and 89] A print response packet of print data is created and stored in the memory 310, the print processing means is executed, and the process returns to step 75 in FIG.

2-3-3. Reception packet processing means 2, 3
Operation of Controller 370 in FIG. 9 and FIG. 10 are flowcharts showing the operation of the controller 370 in the received packet processing means 2 and 3 of FIG. In the reception packet processing means 2, the SS receiver 35
The received packet from the transmitter 2 received in 1 is processed.

[Step 91] Decomposition of Received Packet The received packet from the transmitter 2 received by the SS receiver 352 is decomposed into print data having a predetermined data length.

[Step 92] Restoration of print data The print data is subjected to spread spectrum demodulation to restore the original print data and stored in the memory 362, and the process returns to step 75 of FIG. In the reception packet processing means 3, the SS receiver 352
The processing of the received packet from the transmission device 2 received in step 1 is performed by the same processing as steps 91 and 92 above.
02, the restored original print data is stored in the memory 363, and the process returns to step 75 of FIG. 7.

2-3-4. Control in print processing means
Operation of Printer 370 FIG. 11 shows the controller 370 in the print processing means of FIG.
3 is a flowchart showing the operation of FIG.

[Step 111] Selection of Read Memory A memory (8 memory 361 or memory 362) from which print data is read is selected.

[Steps 112 and 113] Data read and data transmission The print data is read from the selected memory and the read data is transmitted to the printer P via the printer interface 300.

[Step 114] Judgment of End of Print Data It is judged whether or not the print data is ended. If the print data is ended, steps 115 to 117 are executed, and if not ended, the process returns to step 112.

[Steps 115 to 117] The memory from which the print data is read is cleared, the output of the final print data is waited for, a print end information packet is created for the transmitter 2 of the print data transmission source, and the steps of FIG. 7 are performed. Return to 75.

<Modification> Further, although FIG. 3 shows only one system of the printer interface, for example, 2
A system interface is provided, and printing of print data sent from each transmission device can be performed by a selected printer as necessary. To this end, for example, a printer selection switch is provided on an operation panel (not shown) on the side of the transmitting device in FIG. 2, the printer selecting information is transmitted as additional information when the transmitting device issues a print start request, and the receiving device side Then, this additional information may be stored in the same memory block as the print data, and then the received print data may be stored in the memory for each output printer.

Depending on the type of printer, there is a type in which a plurality of types of paper can be selected and the printing paper can be switched to perform printing. When such a printer is used, for example, a paper changeover switch is provided on the operation panel of the transmission device side, and this paper changeover information is transmitted as additional information when the transmission device issues a print start request, and the reception device side The additional information may be stored in the same memory block as the print data, and then the received print data may be stored in the memory for each output printer. These are all controllers 270, 3 shown in FIGS. 3 and 4 as applied functions of basic functions.
It is controlled and realized by 70.

In this embodiment, a printer is used as a data output device connected to the receiving device, but the present invention is not limited to this, and a visual display device such as a display may be used, or a floppy disk or the like. It may be a storage device. Further, the data processing device connected to the transmission device is not limited to the office data processing device, and may be, for example, an analog data processing device or an output unit of the control device. Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment,
Needless to say, various modifications can be made.

[0070]

As described above, according to the present invention, since the memory provided in the transmitter may have a small capacity, the transmitter can be provided at a low cost. Further, it is possible to provide an environment in which a plurality of data processing devices can easily output to a desired data output device. Therefore, data can be obtained with a small number of data output devices without purchasing the number of data output devices corresponding to the number of data processing devices, so that the data processing devices can be effectively used. Further, the output data transmitting / receiving apparatus of the present invention has confidentiality and confidentiality during wireless communication (during data transmission / reception), which is a characteristic of spread spectrum communication, so that crosstalk to the outside can be prevented. The security of can be established.

[Brief description of drawings]

FIG. 1 is a conceptual diagram showing an embodiment of an output data transmitting / receiving apparatus by spread spectrum communication as a first invention based on the present invention.

FIG. 2 is a block diagram showing a configuration of an embodiment of a transmission device as a second invention.

FIG. 3 is a block diagram showing a configuration of an embodiment of a transmission device as a third invention.

FIG. 4 is a timing chart showing an example of a data flow in the apparatus of FIG.

FIG. 5 is a flowchart showing a basic operation of a controller of the transmission device.

6 is a flowchart showing the operation of a controller in the received packet processing means shown in FIG.

7 is a flowchart showing a basic operation of a controller of the receiving apparatus of FIG.

8 is a flowchart showing the operation of the controller in the received packet processing means of FIG.

9 is a flowchart showing the operation of the controller in the received packet processing means of FIG.

10 is a flowchart showing the operation of the controller in the received packet processing means of FIG.

11 is a controller 370 in the print processing unit of FIG.
3 is a flowchart showing the operation of FIG.

FIG. 12 is an example of a data processing device.

FIG. 13 is an explanatory diagram of a wireless LAN as a conventional technique.

[Explanation of symbols]

2 data transmitter 3 data receiver 200,300 interface 210, 260, 310, 361, 362, 363 memory 220 SS (spread spectrum) transmitter (first transmitter) 230, 330 duplexer (connection switching means) 250 SS Receiver (first receiver) 270,370 Controller 280,380 Transmission / reception antenna 320 SS transmitter (second transmitter) 340 Power splitter (channel switching means) 350 SS receiver (second receiver) C Computer (data processing device) P printer (data output device)

Claims (4)

[Claims] 1. A first transmitter which is connected to a data processing device and spread-spectrum-modulates output data and control data of the data processing device for transmission; and a first transmitter which spread-spectrum demodulates a received signal to obtain control information. Second receiver connected to a data output device and a data output device, the output data and control data of the data processing device are taken out and sent to the data output device. And a second transmitter that spread-spectrum-modulates and transmits the control information of the data output device,
And a data receiving device having spread spectrum communication. 2. A transmission data storage device, wherein the data transmission device temporarily stores transmission data from the external device obtained through the interface, an interface connected to the external device for data transmission and reception. A memory, a spread spectrum transmitter for performing spread spectrum modulation of the transmission data and transmitting the same, a spread spectrum receiver for performing spread spectrum demodulation of the reception signal to obtain the reception data, and reception data for temporarily storing the reception data A memory, at least the interface, the transmission data memory, the spread spectrum transmitter, the spread spectrum receiver, a control unit for controlling the reception data memory, the antenna, the spread spectrum transmitter and the spread spectrum. Connection switching means for sharing with the receiver 1. The method according to claim 1, wherein
The data transmission / reception device according to. 3. The data receiving device, an antenna, an interface for connecting to a data output device to transfer data, a plurality of spread spectrum receivers for performing spread spectrum demodulation of a received signal to obtain received data, A reception data memory for temporarily storing the reception data, a transmission data memory for temporarily storing the transmission data from the data output device obtained via the interface, and spread spectrum modulation of the transmission data. And a spread spectrum transmitter for transmitting at least the interface, each of the spread spectrum receivers,
A control unit for controlling the reception data memory, the transmission data memory and the spread spectrum transmitter, and connection switching means for sharing the antenna between the spread spectrum transmitter and each of the spread spectrum receivers. The data transmission / reception apparatus according to claim 1, further comprising: 4. The data transmitting / receiving apparatus according to claim 3, further comprising signal dividing means for dividing a carrier wave of a received input signal, wherein each of the plurality of spread spectrum receivers has a predetermined spread code from the divided signal. A data transmission / reception device, characterized in that one of the more obtained channels is selected to receive a signal.