JP2003050777A - Method for controlling peripheral devices and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technology, capable of securing reliability of processing regarding data transfer among peripheral equipment and preventing lowering of processing speed as well, even if the peripheral devices are connected via a network. SOLUTION: These are provided a printer driver 33, having a function 37 for acquiring information ϕ5 with a maximum band width, usable immediately prior transmission of a data group 41, a control function 38 for calculating transferable speed of the data group 41 based on the information ϕ5 and to set operating speed on the side of a printer 3 by a command ϕ1 and a function 39 for outputting the data group 41, is provided. Thus, transfer of the data group 41 at the maximum transferable speed is enabled, and printing is conducted in the shortest processing time, while maintaining reliability of the processing regarding data transfer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for controlling a peripheral device used by being connected to an information processing terminal.

[0002]

2. Description of the Related Art In recent years, peripheral devices such as printers and scanners compatible with USB and IEEE 1394 interfaces have become widespread. These peripheral devices can construct a network system in which a plurality of personal computers (hereinafter, information processing terminals, host computers or hosts) are connected in a tree type or a daisy chain type using a repeater or a hub.

[0003]

In a system in which peripheral devices are connected by a network, traffic on the transmission path between the peripheral devices and the host becomes one problem. For example, when a group of data processed by the host is printed by the printer, if the traffic on the transmission path between the printer and the host is large, the transfer rate of the print data may be lower than the processing speed of the printer. If the speed difference is large, a data overrun error may occur, and a part of the data group transferred from the host may not be printed, or a blank page may be output in an extreme case. Particularly, in a page printer such as a laser printer, since print data for one page is collectively printed as one data group, such a phenomenon is likely to occur.

Also, when the image data generated by the scanner is loaded into the personal computer, if the transfer rate of the network is lower than the speed at which the image data is transmitted from the scanner, data loss occurs and the image captured by the host is captured. Missing data may occur.

Such a problem is caused by IEEE1394 and US
The present invention is not limited to a network constructed by using B as an interface, and may occur similarly in a network constructed by a LAN interface (Ethernet (registered trademark)). Therefore, considering the increase in opportunities to operate peripheral devices in the network environment in the future, there is a strong demand for a technology that can securely print jobs with peripheral devices and obtain image data without data loss. There is.

As means for solving a problem such as a data overrun error, isochronous transfer is supported by IEEE1394, USB and the like. This transfer method secures a desired bandwidth between the host computer and peripheral devices and divides the data group at a fixed cycle, as opposed to the general asynchronous transfer that transmits data at any time. This is a transfer method for transferring data by using a transfer method. Therefore, by securing a sufficient bandwidth in advance between the peripheral device and the host, it is possible to prevent the above-described overrun error and data loss. However, when the transmission path between the host and the peripheral device or a part of the transmission path is occupied by communication for another purpose, it is impossible to set the isochronous transfer because a sufficient bandwidth cannot be secured. Therefore, if an attempt is made to use the isochronous transfer, there is a problem that the transfer itself of the data group is delayed and the total processing time for transferring the data with the peripheral device is extended. Therefore, if the isochronous transfer is adopted, the reliability of data transfer with the peripheral device is improved, but the processing speed itself is likely to decrease.

Therefore, according to the present invention, even in an environment in which peripheral devices are connected via a network, the reliability of the process related to the data transfer with the peripheral devices is ensured and the processing speed is reduced. The purpose is to provide a technology that can also prevent. Further, it is an object of the present invention to provide a technique capable of transferring data in a short time without causing an overrun error or missing data.

[0008]

[Prior Art] Conventionally, peripheral devices have been adjusted to maximize their capabilities. For example, a printer is set so that it can print at the maximum printable speed. Then, the data transfer rate is also set accordingly, and if the bandwidth matching the data transfer rate can be secured by isochronous transfer, it is possible to print at the maximum speed of the printer and an overrun error occurs. do not do. However, because the conditions are such that only such maximum performance can be exhibited, data transfer itself cannot start unless the bandwidth can be secured by isochronous transfer, while overrun occurs when the data transfer speed is slow. An error will occur. Therefore, in the present invention, when the transferable speed is low, the operating speed or processing speed of the peripheral device is not always kept at the maximum, but is controlled according to the data transferable speed. Job delay is prevented by performing reliable processing at the transfer speed, and on the other hand, when transferable speed is high, reliable processing can be performed at high speed at the high transfer speed.

Therefore, in the present invention, the operation speed of the peripheral device is controlled according to the speed at which the data group can be transferred between the information processing terminal and the peripheral device, thereby improving the reliability of the processing related to the data transfer. Then, two contradictory problems of improving the processing speed can be solved at the same time. That is,
In the present invention, before transferring a data group between an information processing device and a peripheral device connected via an interface, a first step of acquiring information on an element that affects a transfer rate of the data group Then, a transferable speed of the data group is obtained based on the element information, and at least one operation of the peripheral device is controlled so that the peripheral device has a processing speed suitable for processing the data group at the transferable speed. Provided is a method of controlling a peripheral device, which has a second step of controlling a speed and a third step of transferring a data group to and from the peripheral device. In the peripheral device control method of the present invention, for each data group transferred between the information processing terminal and the peripheral device, the speed at which the data group can be transferred is obtained, and an input / output mechanism for inputting and / or outputting data is provided. You can set the operating speed of the peripheral device you have. For jobs that transfer multiple data groups, it is possible to set the operating speed on the peripheral device side for each data group and transfer the data group at the maximum transferable speed. Jobs can be executed in the shortest processing time while maintaining reliability.

The peripheral device control method of the present invention can be provided as programs such as driver software for controlling peripheral devices connected via an interface from the side of the information processing terminal, firmware for controlling the peripheral devices themselves. And the program has instructions for performing the above steps. And
If the firmware controls the peripheral device itself, the second
The step of controlling the speed of operation of at least one of the input / output mechanisms. On the other hand, if the driver program is installed in the information processing terminal, it transmits a command for controlling the speed of at least one operation of the peripheral device.
Any of the programs of the present invention can be recorded and provided in a recording medium readable by a host computer such as a CD-ROM, or can be distributed via a computer network such as the Internet.

By installing these programs, means for acquiring information on elements that affect the speed at which data groups are transferred between devices connected via an interface, and data groups based on the information on the elements Data transfer between the device and a means for controlling the speed of at least one operation of the peripheral device so as to obtain a transferable speed of the data and a processing speed suitable for processing the data group at the transferable speed. It is possible to provide the information processing terminal and the peripheral device of the present invention having means for transferring a group. Then, the processing system according to the present invention can be constructed by the information processing terminal and the peripheral devices.

As factors that affect the transfer rate of the data group, the processing status on the information processing terminal side and the processing status on the peripheral device side may be considered in addition to the communication speed of the interface. For example, the communication speed may decrease because the processing other than communication is simultaneously operating in the information processing apparatus. However, the processing on the information processing device side and the peripheral device side can reduce the influence on the communication processing by task management. On the other hand, the communication speed of the interface is influenced by the communication with the third party information processing terminal or the peripheral device, so that the information processing terminal or the peripheral device side as the host can freely manage the communication speed. Difficult to do. Therefore, it is most effective to acquire the maximum allowable communication speed of the interface immediately before the transfer of the data group as an element of the transfer speed of the data group and obtain the transferable speed based on the acquired maximum allowable communication speed.

Then, means for ensuring the maximum permissible communication speed of the interface is provided in the information processing terminal or the peripheral device, and in the second step of controlling the operating speed of the peripheral device, the maximum permissible communication speed for which the transferable speed is obtained is obtained. By ensuring that the data group can be transferred, the data group can be transferred at a speed matching the set operation speed of the peripheral device. Therefore, it is possible to more reliably prevent a processing error associated with data transfer.

In the interface of USB or IEEE 1394 interface standard, it is possible to acquire the maximum bandwidth of the interface immediately before transferring the data group as an element, and in the second step, this maximum bandwidth is secured. Commands can be sent to the interface. Then, in the second step, it is possible to set the data to be transferred by the isochronous transfer supported by these interfaces. The interface is not limited to a wired interface and may be wireless. For example, a wireless interface such as Bluetooth (registered trademark) also supports isochronous transfer.

In the present invention, for each data group to be transferred, the operating speed of the peripheral device can be set so that the data can be transferred at the maximum transfer speed at that time. Therefore,
In order to maximize the transfer speed and shorten the job processing time, the unit of the data group should be small. However, when the peripheral device is a printing device such as a printer, a facsimile, or a copier, changing the operating speed in units of lines may deteriorate print quality. Therefore, it is desirable that the data group be data in page units.

If the peripheral device is a printing device, the speed of the operation relating to the printing speed as the operating speed, for example, the speed of feeding the printing paper, the speed of the print head in the case of a serial type such as a thermal type or an inkjet type. ,
Further, the printing speed can be changed by adjusting the number of nozzles used in the print head.

Further, if the peripheral device is a scanner for generating image data, the operation speed related to the image data generation speed, for example, the moving speed of the reading carriage, the document feeding speed, and the image pickup device such as CCD. It is possible to control the storage time of the data.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in more detail below with reference to the drawings. FIG. 1 shows an example of a processing system in which an information processing terminal of the present invention and peripheral devices are connected by a network. In the processing system 1 of this example, three information processing terminals (host computer or host) 2, one inkjet printer 3, one page printer 4, and one scanner 5 are connected by a network 9. Has been done. Peripheral devices of these host 2, inkjet printer 3, page printer 4 and scanner 5 are U
An interface compatible with the SB standard is installed. Therefore, the network 9 of this example includes two repeaters or hubs 6 and the USB cable 10, and data can be freely transferred between any of the hosts 2 and any of the peripheral devices 3 to 5. It is like this.

FIG. 2 shows a schematic configuration when a data transfer is carried out when a connection is established between any one of the hosts 2 constituting the processing system 1 of FIG. 1 and the ink jet printer 3. Inkjet printer 3 of this example
Is a print head 12 having a plurality of nozzles 11 for ejecting ink, a carriage motor 15 for reciprocating the print head 12 along a shaft 13 in the paper width direction (scanning direction), and a paper feed perpendicular to the scanning direction. A paper feed motor 16 for driving a roller 14 for feeding a printing paper 19 in a predetermined direction, a controller 18 for controlling the entire printer, and a USB interface 17 for connecting to the host computer 2 via the transmission path 10. ing. The command φ1 from the host computer 2 acquired via the interface 17 is interpreted by the command interpreting unit 27 of the control unit 18 and controls each of the controllers 21 to 23. Therefore, the printer 3 controls the feed motor 16 to change the paper feed speed by adjusting the rotation speed or timing of the feed motor 16 and the carriage motor 15 adjusts the rotation speed or timing of the print head 12 according to the command φ1 from the host 2. Control to change the moving speed,
Furthermore, control such as changing the number of nozzles 11 used in the print head 12 can be performed.

The host computer 2 has an operating system (OS) 31, an application 32 for processing image data and text data, and a printer driver 33 for printing images and characters specified by the application 32. . Printer driver 33
Is a program or software that controls the printer 3 via the USB interface 34 so that the inkjet printer 3 can print an image or the like instructed to be output by the application 32.

The printer driver 33 of this example has a function 36 of converting application data .phi.7 to be printed such as image data or character data into print data .phi.2, and the generated print data .phi.2 in an appropriate unit such as a printer. Print data φ2 in units of 3 receive buffers
It has a function 39 for dividing and outputting. Furthermore, U
From the SB interface 34, the host 2 and the printer 3
Information on the maximum bandwidth that can be used or secured between
5 and a control function 38 for obtaining a speed at which the print data φ2 can be transferred based on the acquired bandwidth information φ5.

The control function 38 further has a function of determining the operation of the ink jet printer 3 so that the processing speed is suitable for processing the print data φ2 transmitted at the obtained transferable speed. There is. That is, the control for changing the paper feed speed by adjusting the rotation speed or timing of the feed motor 16, the control for changing the movement speed of the print head 12 by adjusting the rotation speed or timing of the carriage motor 15, and the print head described above. The print speed is changed so as to match the transfer speed of the print data φ2 by one of the controls for changing the number of nozzles 11 used in 12. Then, the command φ1 for controlling the motor 16 or 15 to be controlled or the head 12 is sent from the interface 34 to the printer 3.

Further, the control function 38 also transmits the command φ3 to the interface 34 to secure the maximum bandwidth obtained as the information φ5. After that, the output function 39 sends the print data φ2 to the printer 3. Therefore, the printer driver 33 of the present example secures the maximum bandwidth that can be secured by the USB interface 34 when transmitting the print data φ2 to the printer 3, and the printer 3 when the data is transferred in that bandwidth.
The print speed of the printer 3 is controlled so that the error does not occur. Therefore, no time is wasted waiting until sufficient bandwidth can be secured in the interface 34,
It is possible to transfer the data at the maximum speed of the network when the print data φ2 is transmitted from the host 2 to the printer 3, and the printer 3 can be adjusted according to the data transfer speed.
Since the print speed of is also set, an overrun error does not occur. Therefore, it is possible to make full use of network resources and output a highly reliable printout in the shortest time in the situation of printing.

Further, the control mechanism 38 of the printer driver 33 of this example acquires information φ5 of the maximum bandwidth of the USB interface that can be used or secured between the host 2 and the printer 17, and based on the information φ5. The processing for controlling the printing speed of the printer 3 by obtaining the speed at which the print data φ2 can be transferred is performed in page units. That is, the print data φ2 for one page is treated as one data group 41, and each time the data group 41 is output to the printer 3,
Review the transfer rate and set the network to obtain the maximum transfer rate at that time. At the same time, the printing speed of the printer 3 is controlled so that an error does not occur on the printer side when the data group 41 is transferred at the transfer speed. Therefore, in units of printing a page,
Since the transfer speed of the print data φ2 and the print speed of the printer 3 can be optimized, the processing time of the processing (job) for printing a plurality of pages can be further shortened.

FIG. 3 is a flow chart showing an outline of the processing of the printer driver 33. First, in step 51, when there is an instruction to print an image or a character from the application 32, in step 52, the interface 34 of the host 2 by the function 37 for acquiring the information of the maximum bandwidth
The maximum bandwidth information φ5 that can be used on the transmission path between the printer 3 and the interface 17 of the printer 3 is acquired. Then, in step 53, the control function 38 sends a command φ3 to the interface 34 to secure the bandwidth, and in this example, sets the communication environment so that isochronous transfer is possible.

If Linux (registered trademark) is adopted as the OS and the transmission path is the USB standard,
In step 52, the command "usb_check_bandwidth ()"
The information of the vacant bandwidth can be acquired by transmitting Then, in step 53, the command "usb_claim
The bandwidth can be secured by transmitting "_bandwidth ()".

If the interface is the IEEE 1394 standard, in step 52 the command "REQUEST_GET_SP
By transmitting "EED_BETWEEN_DEVICES", it is possible to acquire the maximum bandwidth capable of isochronous transfer as the maximum communication speed available at that time. Next, in step 53, the command "REQUEST_ISOCH_ALLO
CATE_BANDWIDTH "can be sent to allocate the communication speed between devices. In addition, the command "REQUEST
Send _ISOCH_ALLOCATE_CHANNEL "to allocate sync channel as bandwidth and use command" REQUEST_ISOCH_
Send ALLOCATE_RESOURCES "to allocate sync resources and then use the command" REQUEST_ISOCH_ATTACH_BUFFERS "
To prepare a sync buffer. This allows bandwidth to be reserved, and the command "REQU
By transmitting "EST_ISOCH_TALK", the communication condition can be set so that data is isochronously transferred using the reserved bandwidth.

As described above, the maximum bandwidth that can be secured between the host 2 and the printer 3 is secured depending on the situation immediately before the data transfer. In the driver 33, further, in step 54, the control function 38 determines the operating speed of each function of the inkjet printer 3 so as to obtain the printing speed suitable for the maximum secured bandwidth.
Then, in step 55, a command φ1 for controlling each function of the inkjet printer 3 is generated so as to have the determined operation speed, and is transmitted to the printer 3. Accordingly, on the side of the inkjet printer 3, the operating speed of each function such as the speed at which the print head 12 moves is suitable for processing the data φ2 transferred thereafter at the transfer speed set in the above processing. It is set to the condition.

Then, in step 56, the print data φ2 is output from the function 39 to the interface 34. At this time, the state of the transmission path between the interface 34 and the interface 17 is designed to be isochronous transferred in accordance with the secured bandwidth, so that the printer 3 is transferred at the maximum transfer rate when transferring the data φ2. Then, the inkjet printer 3 prints without causing an error due to the difference between the transfer speed and the printing speed.

In step 57, one data group 4
When one page of print data φ2 corresponding to 1 is output, in step 58, if printing is not completed, but there is a data group 41 of the next page, the process returns to step 52 and the maximum bandwidth at that time is returned. The process of acquiring the information φ5, securing the band, and setting the operating speed of the printer 3 to match the transfer speed is repeated. When all printing is completed, the reserved bandwidth is released and the printing process is completed in step 59.

The printer driver 33 that executes these processes can be provided as a program having instructions for executing the above steps, and is provided by being recorded in a computer-readable recording medium such as a CD-ROM. Alternatively, it can be distributed via a computer network such as the Internet. By installing the printer driver 33 in a computer having an appropriate hardware resource such as a communication function, the host 2 having the functions shown in FIG. 2 can be realized.

Thus, the printer driver 33 of this example
2 having a host and a printer 3 controlled thereby
In the processing system 1 in which peripheral devices such as are connected via the network 9, the host 2 controls the processing speed of the printer 3, that is, the printing speed, in accordance with the transferable speed via the network 9. Therefore, even when the transfer speed of the network 9 is slower than the maximum print speed of the printer 3, it is possible to print out from the printer 3 without causing an error due to the transfer speed. Furthermore, even if the transfer speed is slow, the network 9
It is possible to output from the printer 3 through the network without error, and even under a situation where a plurality of jobs are flowing through the network 9, it is possible to print through the network in the shortest processing time according to the situation.
On the other hand, if the transferable speed is sufficiently high, the printing speed of the printer 3 can be maximized, so that it is possible to print with the maximum capacity of the printer 3 whenever possible.
Therefore, according to the present invention, it is possible to obtain a highly reliable output in the shortest processing time according to the state of the traffic of the network 9 without sacrificing the maximum capacity of the processing system 1.

Therefore, the print job is not started because the network traffic is high and the isochronous transfer cannot be performed in the desired bandwidth, or the transfer speed is low with respect to the print speed and an overrun error occurs. Therefore, it is possible to surely obtain the printout from the printer 3 without any error due to the transfer speed. Therefore, it is possible to construct a processing system that is extremely convenient and has a short processing time without reprinting. It is also possible to mount a large-capacity memory on the printer 3 in order to absorb the difference between the transfer speed and the printing speed. However, by applying the present invention, it is possible to add hardware to the printer 3 without adding hardware. Problem can be solved at low cost.

Particularly, in the printer driver 33 of this example,
The print data for one page is set as one data group, and the data can be transferred at the maximum transfer speed according to the network condition at that time. Therefore, when executing a job for printing a plurality of pages, the processing time can be further shortened. Since printing is performed under the same conditions within the same page, print quality does not change in the middle of the page, and high-quality printouts can be obtained in a short time.

In the above description, an example of printing with the ink jet printer 3 has been described, but the same processing can be performed when printing with the laser printer 4. The printing method of the printer is not limited to the inkjet type, and may be a dot impact type or thermal type printing device. Further, the present invention can be applied not only to the printer but also to the case where a facsimile, a copying machine or the like is connected to the network 9 as a printing device. In printing apparatuses other than the inkjet type, the printing speed can be adjusted by controlling the operating speeds of not only the above-mentioned feed motor and carriage motor, but also motors that control other mechanisms and other actuators. . For example, the rotational speed of the polygon mirror, the laser scanning speed, etc. may be controlled from the host 2 via commands.

The present invention can also be applied to the scanner 5 which is a peripheral device connected by the network 9. When the image data is transferred from the scanner 5 to the host 2, if the transfer speed of the network 9 is slower than the reading speed of the scanner 5, data loss may occur in the host 2. On the other hand, a driver for controlling the scanner 5 installed in the host 2, for example, TW
Similar to the printer driver 33 described above, the AIN driver can be equipped with a function of obtaining the maximum transmission speed of the network when transferring data and controlling the reading speed of the scanner 5 accordingly. Then, by matching the speed of reading and transmitting by the scanner 5 with the transfer speed of the network 9, loss of data can be prevented in advance. Then, in order to control the image data transmission speed without increasing the memory capacity of the scanner 5, it is desirable to control the operation speed of the reading mechanism by a command, and the movement speed of the reading carriage and the paper feed speed of the document are controlled. It is conceivable to control or control the time (accumulation time) for accumulating data by the CCD mounted on the reading carriage.

In the scanner 5, when the buffer for transmitting image data becomes full, it waits for the buffer to become empty, and then returns to some distance to start reading so as to keep the speed of the reading head constant, so-called carriage. Repeat the return process. This allows network 9
Even if the transfer speed of the data is slower than the reading speed of the scanner 5, data is transmitted so that the host 2 does not lose data.
Therefore, if the scanning speed of the scanner is faster than the transfer speed of the network 9, not only is the transfer speed of the network 9 limited, but since carriage returns are repeated frequently, the actual transmission speed is higher than the transfer speed of the network. May be slowed down. On the other hand, if the reading speed is matched with the transfer speed of the network 9 by controlling the operation speed of the reading mechanism of the scanner 5 such as the moving speed of the reading carriage, the buffer does not become full and the carriage return is repeated. Can be prevented. Therefore, it is possible to perform data transfer at a reading speed that maximizes the transfer speed of the network 9.

The interface for constructing the network 9 is not limited to the USB or IEEE 1394 standard interface, and the present invention can be applied to a system using an Ethernet (registered trademark) or a wireless interface. Also, in the above, the transfer rate of the network, which is considered to have the greatest effect on the speed at which data is transferred from the host to the peripheral device, is adopted as an element that affects the data transfer. It is also possible to determine the transferable speed by further considering the other factors.

In the above description, the example in which the present invention is realized by the driver software installed in the information processing terminal on the host side has been described, but the present invention can also be provided as firmware to be installed in the peripheral device side. Is.

[0040]

As described above, in the present invention, for each data group transferred between the information processing terminal and the peripheral device, the speed at which the data group can be transferred is calculated to determine the peripheral device side. The operating speed can be set. Therefore, if it is a job to transfer a plurality of data groups, it is possible to set the operation speed of the peripheral device side for each data group and transfer the data group at the maximum transferable speed. Jobs can be executed in the shortest processing time while maintaining the reliability of processing.

[Brief description of drawings]

FIG. 1 is a diagram showing a processing system in which an information processing terminal according to the present invention and peripheral devices are connected via a network.

FIG. 2 is a diagram showing a schematic configuration of a host computer and a printer of this example.

FIG. 3 is a flowchart showing a schematic process of a printer driver installed in a host computer.

[Explanation of symbols]

1 processing system 2 Host computer (information processing terminal) 3 printers 12 print head 17,34 interface 33 Printer driver 37 Functions to acquire 38 Control function 39 Output function 41 data groups φ1, φ3 command φ2 print data φ5 Maximum bandwidth information

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Shuji Yamamoto             2-10-1, Minatomachi, Shimizu City, Shizuoka Prefecture Romankan             14F Narutech Co., Ltd. (72) Inventor Masatoshi Yokota             2-10-1, Minatomachi, Shimizu City, Shizuoka Prefecture Romankan             14F Narutech Co., Ltd. F-term (reference) 2C061 AP01 AQ05 AQ06 HJ08 HK11                       HQ01 HQ21                 5B021 AA01 BB01 BB02 CC06                 5B077 NN02

Claims (23)

[Claims] 1. A program for controlling a peripheral device connected to an information processing terminal via an interface, wherein the program stores the data group before transferring the data group between the information processing terminal and the peripheral device. A first step of acquiring information of an element that affects a transfer rate; a speed at which the data group can be transferred is obtained based on the information of the element, and the peripheral device acquires the data group at the transferable speed. A second controlling a speed of at least one operation of the peripheral device so as to obtain a processing speed suitable for processing;
And a third step of transferring the data group between the information processing terminal and the peripheral device. 2. The program according to claim 1, wherein the element is a maximum allowable communication speed of the interface immediately before transferring the data group. 3. The program according to claim 2, wherein in the second step, processing for ensuring the maximum allowable communication speed of the interface is further performed. 4. The program according to claim 1, wherein the interface is an interface corresponding to the USB or IEEE1394 standard. 5. The program according to claim 4, wherein the element is the maximum bandwidth of the interface immediately before transferring the data group. 6. The program according to claim 5, further comprising: in the second step, transmitting a command for securing the maximum bandwidth to the interface. 7. The program according to claim 5, further comprising: in the second step, transmitting a command for transferring the data group to the interface in an isochronous manner in accordance with the maximum bandwidth. . 8. The program according to claim 1, wherein the peripheral device is a printing device, and the data group is print data in page units. 9. The program according to claim 1, wherein in the second step, a command for controlling a speed of at least one operation of the peripheral device is transmitted to the peripheral device. 10. The program according to claim 1, wherein the peripheral device is a printing device, and in the second step, a program that changes an operation speed related to a printing speed. 11. The program according to claim 1, wherein the peripheral device is a scanner that generates image data, and in the second step, a program that changes an operation speed related to an image data generation speed. 12. A means for acquiring information of an element that influences a speed of transferring a data group to / from a peripheral device connected through an interface, and the data group can be transferred based on the information of the element. And a command for controlling the speed of at least one operation of the peripheral device so that the processing speed is suitable for processing the data group at the transferable speed, and the peripheral device. An information processing terminal having means for transferring the data group to and from the information processing terminal. 13. The information processing according to claim 12, wherein the element is a maximum allowable communication speed of the interface immediately before transferring the data group, and further comprising means for ensuring the maximum allowable communication speed of the interface. Terminal. 14. The information processing terminal according to claim 12, wherein the interface is an interface compatible with a USB or IEEE 1394 standard, and the element is a maximum bandwidth of the interface immediately before transferring the data group. . 15. An input / output mechanism for outputting and / or inputting data, and a means for acquiring information on an element that affects a speed of transferring a data group between an information processing terminal connected via an interface. , A transferable speed of the data group is obtained based on the information of the element, and at least one of the input / output mechanisms is set so as to have a processing speed suitable for processing the data group at the transferable speed. A peripheral device having means for controlling the speed of operation and means for transferring the data group to and from the information processing terminal. 16. The peripheral device according to claim 15, wherein the element is a maximum allowable communication speed of the interface immediately before the transfer of the data group, and means for ensuring the maximum communication speed of the interface. 17. The peripheral device according to claim 15, wherein the interface is an interface compatible with a USB or IEEE 1394 standard, and the element is a maximum bandwidth of the interface immediately before transferring the data group. 18. A processing system including the information processing terminal according to claim 12 and a peripheral device. 19. A processing system including the peripheral device according to claim 15 and an information processing terminal. 20. A first step of acquiring information of an element affecting a transfer speed of the data group before transferring the data group to / from a peripheral device connected to the information processing apparatus via an interface. And a transferable speed of the data group is obtained based on the information of the element, and the peripheral device has a processing speed suitable for processing the data group at the transferable speed. A second for controlling the speed of at least one movement
And a third step of transferring the data group between the information processing device and the peripheral device. 21. The element according to claim 20, wherein the element is a maximum allowable communication speed of the interface immediately before the data group is transferred, and in the second step, the maximum allowable communication speed of the interface is further set. How to control peripheral devices to be secured. 22. The interface according to claim 20, wherein the interface is a USB or IEEE 1394 standard compatible interface, and the element is a peripheral device having a maximum bandwidth of the interface immediately before transferring the data group. Control method. 23. At least one of the peripheral devices according to claim 20,
A method of controlling a peripheral that sends a command to control the speed of one operation.