KR20090012623A - Printer sharing device using wireless usb communication - Google Patents

Printer sharing device using wireless usb communication Download PDF

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Publication number
KR20090012623A
KR20090012623A KR1020070076590A KR20070076590A KR20090012623A KR 20090012623 A KR20090012623 A KR 20090012623A KR 1020070076590 A KR1020070076590 A KR 1020070076590A KR 20070076590 A KR20070076590 A KR 20070076590A KR 20090012623 A KR20090012623 A KR 20090012623A
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KR
South Korea
Prior art keywords
interface unit
wireless interface
printer
client
usb port
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Application number
KR1020070076590A
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Korean (ko)
Inventor
이필원
천익종
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(주)싸이퍼일렉트로닉
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Priority to KR1020070076590A priority Critical patent/KR20090012623A/en
Publication of KR20090012623A publication Critical patent/KR20090012623A/en

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F11/00—Error detection; Error correction; Monitoring
    • G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
    • G06F11/08—Error detection or correction by redundancy in data representation, e.g. by using checking codes
    • G06F11/10—Adding special bits or symbols to the coded information, e.g. parity check, casting out 9's or 11's
    • G06F11/1004—Adding special bits or symbols to the coded information, e.g. parity check, casting out 9's or 11's to protect a block of data words, e.g. CRC or checksum
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/12—Digital output to print unit, e.g. line printer, chain printer
    • G06F3/1201—Dedicated interfaces to print systems
    • G06F3/1278—Dedicated interfaces to print systems specifically adapted to adopt a particular infrastructure
    • G06F3/1285—Remote printer device, e.g. being remote from client or server
    • G06F3/1286—Remote printer device, e.g. being remote from client or server via local network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0061—Error detection codes
    • H04L1/0063—Single parity check

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  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Human Computer Interaction (AREA)
  • Computer Security & Cryptography (AREA)
  • Quality & Reliability (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)

Abstract

In the present invention, a printer sharer (host) having an effective wireless communication means that can use the USB port of the computer and the printer as it is so that the wireless printing environment can be built very easily; And a client for a printer router. The printer router of the present invention includes: a first wireless interface unit for performing communication of a physical layer by a radio frequency communication method with a wireless interface unit of a client; A first USB port that can be wired to the USB port of the printer; And after outputting a connection acceptance signal for the connection request signal of the client received through the first wireless interface unit to the same client through the first wireless interface unit, while maintaining the first radio interface unit to maintain radio frequency communication with the same client. The USB print request signal of the same client received through the first wireless interface unit is transmitted to the first USB port, and the USB print response signal received from the first USB port is transferred to the first wireless interface unit and controlled to be transmitted to the same client. It includes a first control unit.

Description

Printer sharing device using wireless USB communication}

TECHNICAL FIELD The present invention relates to communication between a printer and a computer, and more particularly, to a "printer sharing device" that enables a plurality of computers to communicate with one printer.

Traditional printer routers were wired. That is, in the conventional printer router, the connection of the printer router and the printer; And a connection of a printer router and a plurality of computers; this was done by a parallel or serial communication cable. Therefore, in constructing a printer sharing system, a large number of communication cables have been used, and therefore, very troublesome problems have arisen.

For example, cables are entangled and twisted together, making the user's work environment very cumbersome. Also, due to the entangled and tangled cables, repositioning of the computer or printer becomes very complicated. Accordingly, in the work of changing the position of the computer or printer, a lot of work time is required, and the labor of the user is excessively wasted. In addition, due to the physical use of the communication cable and the limitation of the effective distance of the communication cable, the printer must be located within a limited distance from the computer, or the printer must be located within a limited area of the office space. The degree of freedom is very limited. Accordingly, there are frequent cases where it becomes difficult to position the printer at the optimum place desired by the user.

In order to solve the shortcomings of the wired printer, various efforts have been made to wirelessly implement the communication between the printer and the computer and / or the printer and the printer.

For example, Korean Patent Laid-Open Publication No. 1998-013610 includes a receiving unit which receives serial data of a constant frequency, a central processing unit which analyzes the received data and transmits a command signal to a printer and outputs the signal or sends a signal to a computer. The printer wireless router, which consists of a transmitter for transmitting data output from the central processing unit at a constant frequency, is connected to the Centronics parallel interface, which is a standard data communication interface at the terminal of a computer or printer connected to the central processing unit. There is disclosed a printer wireless sharing system configured to allow multiple computers to share a single printer by sending and receiving data at a constant frequency.

In another example, Korean Patent Laid-Open Publication No. 1999-019424 discloses a wireless interfacing method for interfacing information communicated between at least one personal computer and at least one printer, wherein any one of the at least one personal computer is provided. A first transmission step of selecting any one of a plurality of preset configuration identifiers preset in a personal computer and wirelessly transmitting them to the at least one printer; A determination step of receiving the setting identifier at the at least one printer to determine whether the same as a preset unique identifier; A preparation step of wirelessly transmitting a response signal to the personal computer and switching to a reception waiting state of document data to be printed in any one printer in which the setting identifier and the unique identifier are the same; A second transmission step of receiving the response signal transmitted from the printer at the personal computer and wirelessly transmitting the document data; And a printing step of receiving and printing, at the printer, document data transmitted from the personal computer.

On the other hand, a recent trend shows that most computers and printers have a universal serial bus (USB) port, so that the communication between the computer and the printer is also better than that of the parallel port. It is a general trend that communication is done.

However, in the conventional wireless printer router including the patent document, no effective wireless communication means capable of using the USB port included in the computer and the printer as it is is proposed at all. Thus, when using the conventional wireless printer router, the user can not use the printer driver for the USB port provided by the printer company as it is, the user is very inconvenienced.

As such, in the conventional wireless printer router, since no effective wireless communication means capable of using the USB ports of the computer and the printer has been proposed at all, many ideas have been flickered, and thus the technology development speed is very high compared to other industrial fields. Despite the fast computer peripheral industry, it is very difficult to encounter commercially available wireless printer routers, and wireless printer routers are not widely used.

On the other hand, as another alternative for establishing a wireless print environment, a method of connecting a printer (also called a network printer) incorporating a network interface card to a wireless router (for example, a wireless IP router) may be considered. However, this approach is relatively expensive than a printer with a built-in network interface card, and requires a complicated network construction and configuration. It is a horseshoe for development.

In the present invention, a printer sharer (host) having an effective wireless communication means that can use the USB port of the computer and the printer as it is so that the wireless printing environment can be built very easily; And a client for a printer router.

A printer router provided by the present invention; And a client for a printer router (hereinafter, simply referred to as a "client") can be combined to form a printer sharing system of a wireless USB communication method. The printer router of the present invention is wired to the USB port of the printer, and the client of the present invention is wired to the USB port of each computer. Clients and printer routers exchange USB signals wirelessly with each other. As a result, each computer and printer can communicate based on a wired USB protocol through an invisible line. As a result, existing printer drivers for wired USB ports can be used.

The printer router of the present invention,

A first wireless interface unit performing communication of a physical layer by a radio frequency communication method with a wireless interface unit of a client;

A first USB port that can be wired to the USB port of the printer; And

After outputting the connection acceptance signal for the connection request signal of the client received through the first wireless interface unit to the same client through the first wireless interface unit, while maintaining the first radio interface unit to maintain radio frequency communication with the same client, The first USB port transmits a USB print request signal from the same client, which is received through the wireless interface unit, to the first USB port, and the USB print response signal received from the first USB port is transmitted to the first wireless interface unit. 1 control unit;

It includes.

The printer router client of the present invention,

A second wireless interface unit for performing communication of a physical layer by a radio frequency communication method with a wireless interface unit of a printer router;

A second USB port that may be connected to a USB port of the computer; And

After outputting the connection request signal to the printer router through the second wireless interface unit, receiving a connection acceptance signal from the printer router through the second wireless interface unit, and then receiving the USB print request signal of the computer received from the second USB port. A second control unit which transmits to the wireless interface unit to be transmitted to the printer router and transfers a USB print response signal received through the second wireless interface unit to the second USB port;

It includes.

In another embodiment of the printer router of the present invention, the first control unit outputs the connection acceptance signal for the connection request signal of the client received through the first wireless interface unit to the first wireless interface unit, and then the first wireless interface unit. In response to the connection request signal of another client received through the first wireless interface unit before the print job according to the USB print request signal of the same client received through the same, the connection wait signal for the other client to the first wireless interface unit You can print

In another embodiment of the client of the present invention, the second control unit outputs the connection request signal to the printer router via the second wireless interface unit, and then receives the connection wait signal from the printer router via the second wireless interface unit. After the waiting time has elapsed, the connection request signal may be output again to the printer router through the second wireless interface unit.

In still another embodiment of the printer router of the present invention, the first control unit includes: a function of verifying data integrity of a communication packet received from a client through the first wireless interface unit; And inserting an error check code for data verification into a communication packet sent to the client through the first wireless interface unit.

In another embodiment of the client of the present invention, the second control unit includes: a function for verifying data integrity of a communication packet received from the printer router via the second wireless interface unit; And inserting an error check code for data verification into a communication packet sent to the printer router through the second wireless interface unit.

A printer router provided by the present invention; And the client can be combined to form a printer sharing system of a wireless USB communication method. The printer router of the present invention is wired to the USB port of the printer, and the client of the present invention is wired to the USB port of each computer. Clients and printer routers exchange USB signals wirelessly with each other. As a result, each computer and printer can communicate based on a wired USB protocol through an invisible line. As a result, existing printer drivers for wired USB ports can be used.

Hereinafter, with reference to the accompanying drawings will be described in more detail the present invention. Fig. 1 is a block diagram showing a printer sharing system of a wireless USB communication system comprising an embodiment of a printer router of the present invention and an embodiment of a client of the present invention.

The printer router 100 may include a first wireless interface unit 120, a first USB port 130, and a first control unit 140, and may optionally include a first memory unit 110.

The first wireless interface unit 120 performs communication of the physical layer by a radio frequency communication method with the wireless interface unit 220 of the client. The first wireless interface unit 120 may transmit data to the wireless interface unit 220 of the client by modulating data or requests received from the first control unit 140 to a radio frequency. In addition, the first wireless interface unit 120 may output data or a request obtained by demodulating the radio frequency signal received from the wireless interface unit 220 of the client to the first control unit 140. Meanwhile, the first wireless interface unit 120 may include a plurality of radio frequency communication channels capable of performing radio frequency communication with a plurality of clients simultaneously. The first wireless interface unit 120 may use, for example, an ultra wide band (UWB) band for radio frequency communication with the wireless interface unit 220 of the client.

The first USB port 130 is a USB port that can be wired to the USB port of the printer. The first USB port 130 transfers the USB print data signal received from the first controller 140 to the USB port of the printer.

The first memory unit 110 may be an active memory means, an inactive memory means, or a combination thereof. The first memory unit 110 may store a program or data for implementing a function of the printer router 100.

The main function of the first control unit 140 is to output the connection acceptance signal for the connection request signal of the client received through the first wireless interface unit to the same client through the first wireless interface unit, and then the first wireless interface unit is the same client. While maintaining the radio frequency communication with the first wireless interface unit, the USB client request signal transmitted from the first client via the first USB port, and the USB print response signal received from the first USB port is transmitted to the first wireless interface It is controlled to be sent to the same client by passing it to the same client. To this end, the first control unit 140, for example, the flow of the USB signal between the first wireless interface 120 and the first USB port 130, the operation of the first wireless interface 120, 1 may control the overall operation of the printer router 100 including the operation of the USB port 130, reading and writing to the first memory unit 110, and the like.

The client 200 may include a second wireless interface unit 220, a second USB port 230, and a second control unit 240, and may optionally include a second memory unit 210.

The second wireless interface unit 220 performs communication of the physical layer by the radio frequency communication method with the wireless interface unit 120 of the printer router. The second wireless interface unit 220 may modulate data or requests received from the second control unit 240 to a radio frequency, and transmit the data or request to the wireless interface unit 120 of the printer router. In addition, the second wireless interface unit 220 may output data or a request obtained by demodulating the radio frequency signal received from the wireless interface unit 120 of the printer router to the second control unit 240. The second wireless interface unit 220 may use, for example, UWB (ultra wide band) band for radio frequency communication with the wireless interface unit 120 of the printer router.

The second USB port 230 is a USB port that can be wired to the USB port of the computer. The second USB port 230 transmits the USB print data signal received from the computer to the second control unit 240.

The second memory unit 210 may be an active memory means, an inactive memory means, or a combination thereof. The second memory unit 210 may store a program or data for implementing a function of the client 200.

The main function of the second controller 240 is to output the connection request signal to the printer router through the second wireless interface unit, and then receive the connection acceptance signal from the printer router through the second wireless interface unit, and then the second USB port. The computer transmits the USB print request signal received from the computer to the second wireless interface unit to be transmitted to the printer router, and transmits the USB print response signal received through the second wireless interface unit to the second USB port. To this end, the second control unit 240, for example, the flow of the USB signal between the second wireless interface 220 and the second USB port 230, the operation of the second wireless interface 220, 2 may control the overall operation of the client 200 including the operation of the USB port 230, reading and writing to the second memory unit 210, and the like.

Again, referring to Figure 1, the operation of the printer router of the present invention constituting the printer sharing system of the wireless USB communication method and the client of the present invention in detail as follows.

When the USB print request signal of the computer is received through the second USB port 230 of the client 200, which is wired to the USB port of the computer, the second control unit 240 of the client 200 firstly obtains a second message. The wireless interface unit 220 transmits the connection request signal to the printer router 100.

The first control unit 140 of the printer router 100 that receives the connection request signal of the client 200 through the first wireless interface unit 120 transmits the connection acceptance signal through the first wireless interface unit 120. After transmitting to the client 200, the first wireless interface unit 120 maintains radio frequency communication with the same client 200.

Note that the connection request signal and the connection acceptance signal are signals exchanged only between the printer router 100 and the client 200. Computers and printers are not involved in the exchange of connection request signals and connection acceptance signals at all.

By exchanging the connection request signal and the connection acceptance signal, eventually, the USB communication between the second USB port 230 connected to the computer and the first USB port 130 connected to the printer is as though a wired USB communication cable is connected. The channel is implemented.

Thus, the USB print request signal output from the computer is, through the second USB port 230, the second control unit 240 and the second radio interface unit 220, as a modulated radio frequency signal as a first radio interface unit ( 120). Next, the USB print request signal demodulated by the first wireless interface unit 120 is input to the printer through the first control unit 140 and the first USB port 130.

In addition, the USB print response signal output from the printer, through the first USB port 130, the first control unit 140 and the first radio interface unit 120, as a modulated radio frequency signal as a second radio interface unit ( 220). Next, the USB print response signal demodulated by the second wireless interface unit 220 is input to the computer through the second control unit 240 and the second USB port 230.

Through this process, even if a USB cable is not connected between the computer and the printer, the computer and the printer can exchange USB print signals with each other. Also, in this process, the printer and the computer do not need to recognize the existence of the printer router 100 and the client 200. As a result, the printer router 100 and the client 200 may provide a "wireless" communication channel through which the printer and the computer may exchange "wired" USB print data signals.

Of course, the printer router 100, after processing the USB print request signal received from the client 200 connected to a specific computer, the same process, received from a client connected to the same computer or another computer The USB print request signal can be processed sequentially.

Thus, by using the printer router of the present invention and the client of the present invention, the printer sharing system of the wireless USB communication system can be configured very easily. That is, the user only needs to remove the USB communication cable between the existing computer and the printer and attach the client and the printer router of the present invention to each USB port, and there is no need to install a separate driver software on the computer. Printing can be done successfully only with the existing printer driver for USB port support.

In another embodiment of the printer router of the present invention, the first control unit outputs the connection acceptance signal for the connection request signal of the client received through the first wireless interface unit to the first wireless interface unit, and then the first wireless interface unit. In response to the connection request signal of the other client received through the first wireless interface unit before the print job according to the USB print request signal of the same client received through the first wireless interface, the connection wait signal for the other client is transmitted to the first wireless interface. You can output negative.

This implementation can be usefully applied when there is contention of connection request signals from a plurality of clients. The contention of the connection request signals from the plurality of clients may include outputting the connection acceptance signal for the connection request signal of the specific client received through the first wireless interface unit to the first wireless interface unit, and then receiving the connection request signal through the first wireless interface unit. This is a case where a connection request signal from another client is received through the first wireless interface unit before the print job according to the USB print request signal of the same client is completed. In this case, the first controller of the printer router transmits the connection standby signal to the other client through the first wireless interface unit. In order to enable the first control unit of the printer router to identify each client, the connection request signals from the plurality of clients may include an identification code of each client.

In another embodiment of the client of the present invention, the second control unit outputs the connection request signal to the printer router via the second wireless interface unit, and then receives the connection wait signal from the printer router via the second wireless interface unit. After the waiting time has elapsed, the connection request signal may be output again to the printer router through the second wireless interface unit.

This implementation can be usefully applied when there is contention of connection request signals from a plurality of clients. The contention of the connection request signals from the plurality of clients may include outputting the connection acceptance signal for the connection request signal of the specific client received through the first wireless interface unit to the first wireless interface unit, and then receiving the connection request signal through the first wireless interface unit. This is a case where a connection request signal from another client is received through the first wireless interface unit before the print job according to the USB print request signal of the same client is completed. In this case, the other client receives a connection wait signal from the printer router. Next, the second control unit of the other client re-outputs the connection request signal to the printer router via the second wireless interface unit after the waiting time set in the second control unit has elapsed. At this time, if the print job requested from the specific client is completed, the other client can receive a connection acceptance signal from the printer router. However, if the print job requested from the specific client has not yet been completed, the other client receives a connection wait signal from the printer router again. In order to enable the first controller of the printer router to identify the client, the client may transmit a connection request signal including its own identification code.

In still another embodiment of the printer router of the present invention, the first control unit includes: a function of verifying data integrity of a communication packet received from a client through the first wireless interface unit; And inserting an error check code for data verification into a communication packet sent to the client through the first wireless interface unit.

This embodiment makes it possible to compensate for the loss of communication data in the process of radio frequency communication between the printer router and the client. As the data integrity verification method, for example, a parity verification method or a cyclic redundancy check (CRC) verification method may be used. The first control unit of the printer router verifies the data integrity of the communication packet received from the client, and then sends a resend signal for the communication packet in error to the client. The first control unit of the printer router inserts the data verification error check code into the communication packet sent to the client so that the client can verify data integrity with respect to the communication packet sent to the client. In this way, if data integrity verification related to the radio frequency communication is performed between the printer router and the client, the computer and the printer are not affected at all by the loss of data related to the radio frequency communication, and thus the printing job can be completed smoothly. have.

In another embodiment of the client of the present invention, the second control unit includes: a function for verifying data integrity of a communication packet received from the printer router via the second wireless interface unit; And inserting a data verification error check code into a communication packet sent to the printer router through the second wireless interface unit.

This embodiment makes it possible to compensate for the loss of communication data in the process of radio frequency communication between the printer router and the client. As the data integrity verification method, for example, a parity verification method or a cyclic redundancy check (CRC) verification method may be used. After verifying the data integrity of the communication packet received from the printer router, the second control unit of the client sends a resend signal for the communication packet in error to the printer router. In addition, the second control unit of the client inserts the data verification error check code into the communication packet sent to the printer router so that the printer router can verify data integrity with respect to the communication packet sent to the printer router. In this way, if data integrity verification related to the radio frequency communication is performed between the printer router and the client, the computer and the printer are not affected at all by the loss of data related to the radio frequency communication, and thus the printing job can be completed smoothly. have.

Fig. 1 is a block diagram showing a printer sharing system of a wireless USB communication system comprising an embodiment of a printer router of the present invention and an embodiment of a client of the present invention.

Claims (6)

A first wireless interface unit performing communication of a physical layer by a radio frequency communication method with a wireless interface unit of a client; A first USB port that can be wired to the USB port of the printer; And After outputting the connection acceptance signal for the connection request signal of the client received through the first wireless interface unit to the same client through the first wireless interface unit, while maintaining the first radio interface unit to maintain radio frequency communication with the same client, The first USB port transmits a USB print request signal from the same client, which is received through the wireless interface unit, to the first USB port, and the USB print response signal received from the first USB port is transmitted to the first wireless interface unit. 1 control unit; Printer router comprising a. The method of claim 1, wherein the first control unit, After the connection acceptance signal for the connection request signal of the client received through the first wireless interface unit is output to the first wireless interface unit, the print job according to the USB print request signal of the same client received through the first wireless interface unit is completed. And a connection wait signal for the other client to the first wireless interface unit in response to a connection request signal of the other client previously received through the first wireless interface unit. The method of claim 1, wherein the first control unit, Verifying data integrity of a communication packet received from a client through a first wireless interface unit; And a function of inserting an error verification code for data verification into a communication packet sent to the client through the first wireless interface unit. A second wireless interface unit for performing communication of a physical layer by a radio frequency communication method with a wireless interface unit of a printer router; A second USB port that may be connected to a USB port of the computer; And After outputting the connection request signal to the printer router through the second wireless interface unit, receiving a connection acceptance signal from the printer router through the second wireless interface unit, and then receiving the USB print request signal of the computer received from the second USB port. A second control unit which transmits to the wireless interface unit to be transmitted to the printer router and transfers a USB print response signal received through the second wireless interface unit to the second USB port; Client for a printer router comprising a. The method of claim 4, wherein the second control unit, After outputting the connection request signal to the printer router through the second wireless interface unit, receiving the connection standby signal from the printer router through the second wireless interface unit, and after the waiting time has elapsed, through the second wireless interface unit to the printer router. Client for a printer router, characterized in that for re-outputting the connection request signal. The method of claim 4, wherein the second control unit, Verifying data integrity of a communication packet received from the printer router via the second wireless interface unit; And a function of inserting an error verification code for data verification into a communication packet sent to the printer router through the second wireless interface unit.
KR1020070076590A 2007-07-30 2007-07-30 Printer sharing device using wireless usb communication KR20090012623A (en)

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