KR20010039108A - Method for canceling of printing job - Google Patents

Abstract

PURPOSE: A print task cancellation method is provided to make a host computer transmit a preset control signal to a printer via a printer driver and make the DMA type data receiving printer cancel the corresponding print task according to the control signal. CONSTITUTION: The method comprises steps of a printer CPU checks if data is transmitted via an interface(S301), a DMA controller storing the transmitted data at a memory(S302), the DMA controller detecting a data size in a header of the transmitted data(S303), the DAM controller checks if the data is transmitted as many as the detected data size(S304), the DMA controller drives a printer engine via an engine controller and prints the data stored in the memory in the case that the data is transmitted as many as the detected data size(S305), the DMA controller checks if a control signal of "Request Device ID" is transmitted in the case that the data is not transmitted as many as the detected data size(S306), the DMA controller determining if the current printer is in a DMA receiving mode in the case that the control signal of "Request Device ID" is transmitted(S307), the DMA controller stopping the data transmission in the case that the current printer is in the DMA receiving mode and deleting the print data stored in the memory(S308,S309), and the DMA controller transmitting a signal for forcefully discharging the paper in print(S310).

Description

How to cancel a print job {METHOD FOR CANCELING OF PRINTING JOB}

The present invention relates to a method of canceling a print job, and more particularly, when a printer receives data transmitted from a host computer by a direct memory access (DMA) method in a printer and prints the data, the user may perform a print job during data transmission. When canceling, the present invention relates to a method of canceling a print job, which can quickly cancel a print job in a printer receiving data by a DM method by sending a preset control signal to cancel a print job from a host computer.

DMA stands for Direct Memory Access and refers to a method of information transfer that means direct memory access. In the general information transmission method, the central processing unit outputs information stored in the storage device to the peripheral device, while the DMA method transfers the information stored in the storage device to the peripheral device without the intervention of the central processing unit. In DMA, a device called a controller reads information directly from a memory device and transfers the information to a peripheral device, or stores information in a memory device.

Such a DMA method can improve the processing speed of the system because data transmission and reception are performed without the intervention of the central processing unit.

Here, the operation of the printer for receiving data transmitted from the host computer in a DMA manner will be briefly described.

When data is received from the host computer, the DMA controller detects the size of the data transmitted in the header of the data while storing the received data in the storage device. When the size of data transmitted from the host computer in the header of the data is detected, the DMA controller waits until reception of data corresponding to the size of the data detected in the header of the data is completed. That is, one process process is terminated and the next process process is performed only when data is received as much as the size of the detected data.

When the data of the size defined in the header of the data is received, the DMA controller transfers the data stored in the storage device to the printing device and performs the following process of performing a print job.

On the other hand, it is possible to interface with a printer that receives data in a DMA manner, and the host computer that transmits data to be printed to the printer selects a print command in order to print data created by an application program to the printer. The data is divided into predetermined sizes, and the size of the divided data is indicated in the header of the data and transmitted to the printer.

Here, when the user cancels a print command through the printer driver of the host computer while transferring data from the host computer to the printer, the host computer is configured to add and transmit dummy data of arbitrary size.

That is, since a printer receiving data in the DMA manner does not end one process until the data of the size defined in the header of the data is received from the host computer, the host computer does not terminate the print job by the user. Is to send additional dummy data.

In this case, the host computer adds dummy data having a value as large as the maximum block size because the host computer cannot exactly know the size of the data actually transmitted to the printer in comparison to the data size defined in the header of the data. Therefore, the data transmitted to the actual printer may be larger than the size defined in the header of the data.

When the size of data transmitted from the host computer is larger than the size defined in the header of the data, the DMA controller determines the data transmitted from the host computer and stored in the storage device as invalid data and deletes it.

As such, when the user cancels a print job of data being transmitted from the host computer to the printer, the host computer transmits dummy data to the printer, and the printer sets the size of the data transmitted from the host computer to the size defined in the data header. Cancel the print job if it is larger than Therefore, a problem arises in that it takes a considerable time to actually cancel the print job in the printer according to the user's cancel job print command.

Accordingly, an object of the present invention is to solve such a problem, and an object of the present invention is to provide a printer driver of a host computer to quickly cancel a print job in a printer receiving data in a DMA manner according to a user's cancel job command. When a user cancels a print job through the host computer, a predetermined control signal is sent from the host computer to the printer, and the printer receives the data in a DMA manner according to the preset control signal.

1 is a schematic block diagram of a computer and a printer applied to the present invention,

2 is an operation flowchart of a computer for canceling a print job according to the present invention,

3 is an operation flowchart of a printer for canceling a print job according to the present invention.

A feature of the present invention for achieving the above object is a method for canceling a print job of a printer that receives and prints data transmitted from a computer in a direct memory access method, wherein: Confirming that the cancel print command is selected for dividing by size, sending the divided data to the printer, and canceling the print job.If the cancel print command is selected, the computer stops sending the divided data and cancels the print job. Transmitting a predetermined control signal to a printer; checking whether a predetermined control signal is received from the computer while receiving and printing the divided data transmitted from the computer by the printer in a DM method; and preset control from the computer. When a signal is received, the printer sends it from the computer. Includes stopping the print job of the divided data.

Preferably, the step of stopping a print job includes stopping receiving the divided data transmitted from the computer when a preset control signal is received from the computer, and deleting data stored in the memory of the printer among the divided data transmitted from the computer. And forcibly ejecting the print paper for recording the data received from the computer.

Here, the preset control signal is preferably a "Request Device ID" based on IEEE 1284 defined by the Institute of Electrical and Electronic Engineers (IEEE).

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First, in adding reference numerals to the elements of each drawing, it should be noted that the same elements are denoted by the same reference numerals as much as possible even if they are displayed on different drawings. In addition, in the following description there are shown a number of specific details, such as components of the specific circuit, which are provided only to help a more general understanding of the present invention that the present invention may be practiced without these specific details. It is self-evident to those of ordinary knowledge in Esau. In describing the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

1 is a schematic block diagram of a computer and a printer applied to the present invention, FIG. 2 is a flow chart of a computer for canceling a print job according to the present invention, and FIG. A flow chart of the printer for canceling a print job is shown.

Referring to FIG. 1, the present invention is divided into a computer and a printer for performing a method of canceling a print job. Referring to the computer part, the central processing unit 10 for a computer generally controls the system according to a set operation program. In particular, according to a preferred embodiment of the present invention, each component is controlled to transmit a preset control signal to the printer according to the user's cancel command.

The computer memory 11 stores an operation program of the central processing unit 10 for a computer, general control programs, and data according to program execution.

The application program 12 is a program that a user can create various documents.

The printer driver 13 converts the data created by the application program 12 into data that can be interpreted by the printer, and displays a print information selection screen for selecting various print information of the document created by the application program 12.

The interface unit 14 is a part connecting the computer and the printer, and transmits a control signal for controlling the data generated by the application program 12 and the printer output from the central processing unit 10 for the computer, and controlling the host computer. Receive a signal from the printer in response to the signal. Here, the control signal transmitted and received between the computer and the printer is based on IEEE 1284 defined by the Institute of Electrical and Electronic Engineers (IEEE).

On the other hand, looking at the printer parts that can interface with the computer, the printer central processing unit 20 controls the system as a whole according to the set operation program.

The printer memory 21 stores an operation program of the central processing unit 20 for a printer, a general control program, and data according to program execution.

The interface unit 22 is a part connecting the printer and the computer, and receives data and control signals from the computer.

The DMA controller 23 stores the data received through the interface unit 22 in the printer memory 21, and prints the data stored in the printer memory 21 when data of a predetermined size is received. The controller 24 is controlled.

The engine controller 24 drives the printer engine 25 to print data stored in the printer memory 21 under the control of the DMA controller 23, and the printer engine 25 controls the control of the engine controller 24. Therefore, it is in charge of the actual printing work to print the data on the recording paper.

An operation of the present invention having such a configuration will be described in detail with reference to FIGS. 2 and 3.

First, referring to FIG. 2, when a computer command is selected, the central processing unit 10 for a computer may print data of a document created by an application program 12 through the interface unit 14 when a print command is selected. In step S202.

Here, the data of the document created in the application program 12 and stored in the computer memory 11 is divided into predetermined sizes and transmitted to the printer, and represents the size of the data transmitted from the head of the data to the printer.

The central processing unit 10 for the computer transmits data to the printer through the interface unit 14, and when a signal for requesting data transmission is received from the printer, the central processing unit 10 transmits the next data and checks whether data transmission is completed ( S203).

As a result of the check, if the data transfer is completed, the job is terminated. If the data transfer is not completed, it is checked whether a cancel print command is selected (S204).

Here, the print cancel command can be selected by the user through the printer driver 13. That is, when the user wants to cancel the print job of the data being transmitted from the computer to the printer, the user drives the printer driver 13 and presses the cancel print button to cancel the print job on the print information selection screen provided by the printer driver 13. To choose.

When the user selects a cancel print command through the printer driver 13, the central processing unit 10 for the computer stops the transmission of data being transmitted to the printer through the interface unit 14 (S205), and according to IEEE 1284. By transmitting a "Request Device ID" signal to the printer (S206).

Here, the "Request Device ID" control signal is for identifying a device connected through the interface unit 14 of the computer and is a control signal for requesting an identifier (ID) of a device that can be interfaced.

Further, in the present invention, when the user selects a print cancel command while transmitting data from the computer to the printer, it is set in advance to transmit a "Request Device ID" control signal to the printer.

Therefore, in the computer applied to the present invention, when the user selects the cancel printing command, instead of adding dummy data of a predetermined size to the data transmitted to the printer, a preset control signal indicating cancel printing, that is, "Request Device ID" control is performed. The signal is sent to the printer.

Meanwhile, an operation of a printer that can interface with the computer as described above will be described with reference to FIG. 3.

The central processing unit 20 for the printer checks whether data is received through the interface unit 22 (S301), and when data is received from the computer, the DMA controller 23 signals permission to control the input / output of the data. Outputs

Thereafter, the DMA controller 23 stores the data received from the computer through the interface unit 22 in the printer memory 21 according to the permission signal of the central processing unit 20 for the printer (S302).

The DMA controller 23 detects the size of the data in the header of the data received from the computer (S303), and compares whether the data is received from the computer by the size of the detected data (S304).

As a result of the comparison, when data is received from the computer by the amount of data detected in the data header, the DMA controller 23 controls the engine controller 24 to drive the printer engine 25, and the printer engine 25 controls the engine controller. According to the control of step 24, a print job for printing data stored in the printer memory 21 on a recording sheet is performed (S305).

As a result of the comparison, if data is not received from the computer by the size of the data detected in the data header, the DMA controller 23 checks whether a "Request Device ID" control signal is received from the computer (S306).

As a result of the check, when the "Request Device ID" control signal is received from the computer, the DMA controller 23 determines whether the current printer is in the DMA reception mode (S307).

As a result of determination, if the current printer is in the DMA receiving mode, the DMA controller 23 stops receiving data transmitted from the computer via the interface unit 22 (S308), and deletes the data stored in the printer memory 21. (S309). Thereafter, the DMA controller 23 sends a predetermined control signal to the engine controller 24 to forcibly eject the paper being printed. The engine controller 24 drives the printer engine 25 under the control of the DMA controller 23 to discharge the paper on which the print job is stopped (S310).

That is, the "Request Device ID" control signal received from the computer while the printer is receiving data in the DMA manner indicates that the user has selected a cancel print command to cancel the print job. Therefore, the printer stops receiving the current data. The print job is canceled by forcibly ejecting the print paper.

As a result of the determination, if the current printer is not in the DMA receiving mode, the printer central processing unit 20 transmits the ID of the printer to the computer in response to the "Request Device ID" control signal received from the computer (S311).

On the other hand, if the "Request Device ID" control signal is not received as a result of the check in step 306 (S306) of confirming whether the "Request Device ID" control signal is received from the computer, the DMA controller 23 prints the data received from the computer. The process returns to step 302 (S302) for storing in the memory 21 for use.

Therefore, the printer receiving the data by the DMA method can quickly cancel the print job of the data currently in progress as the "Request Device ID" control signal is received from the computer.

As described above, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined by the claims below and equivalents thereof.

As described above, according to the method of canceling a print job according to the present invention, when a user selects a command for canceling a print job in progress in a printer receiving data by a DMA method, a preset control signal for canceling a print job from a computer is received. By transmitting to the printer, the printer deletes the data stored in the memory in accordance with a preset control signal and forcibly ejects the sheet, thereby advantageously canceling the print job.

Claims (3)

In a method of canceling a print job of a printer that receives and prints data transmitted from a computer using a direct memory access method, the method includes: Dividing the data created by the application program of the computer into a predetermined size and confirming that a cancel print command for canceling a print job while transmitting the divided data to the printer is selected; If the print cancel command is selected, transmitting, by the computer, a predetermined control signal to the printer to stop transmission of the divided data and to cancel a print job; Confirming whether the predetermined control signal is received from the computer while receiving and printing the divided data transmitted from the computer by the printer in a DM method; And stopping the print job of the divided data transmitted from the computer when the preset control signal is received from the computer. The method of claim 1, wherein the stopping of the print job comprises: Stopping reception of the divided data transmitted from the computer when the preset control signal is received from the computer; Deleting data stored in a memory of the printer among the divided data transmitted from the computer; And forcibly discharging the print paper for recording the data received from the computer. The method of claim 2, wherein the preset control signal, Method of canceling a print job, characterized in that the "Request Device ID" according to IEEE 1284 as defined by the Institute of Electrical and Electronic Engineers (IEEE).