JP2004118517A - Data transfer method and device, printing method, printer, control program for data transfer device, and storage medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a data transfer method and device capable of realizing positive and rapid data transfer in a high-speed responding device of universal serial bus (USB) specification, and to provide a printing method, a printer, a control program for the data transfer device, and a storage medium. <P>SOLUTION: In the data transfer device for transferring data between a host PC 101 and the printer 102, a printer controller 104 controls to change the set time of a timer for detecting the end of data, according to a transfer mode. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a data transfer method and apparatus for performing data transfer between a host-side apparatus and peripheral devices, a printing method, a printing apparatus, a control program for the data transfer apparatus, and a storage medium.
[0002]
[Prior art]
In recent years, USB has been widely used as a method of connecting a peripheral device such as a printer (printing device) to a host device such as a PC (personal computer). USB has been developed for the purpose of integrating existing legacy interfaces, and is becoming popular due to its ease of use by plug-and-play, hot-swapping, high port expandability, and the like. Further, in the USB standard Rev 2.0 specification, whose official specification was released in April 2000, the transfer speed has been raised to 480 Mbps, and it is considered that the spread of USB will further advance.
[0003]
In addition, techniques related to high-speed data transfer using USB, IEEE1394, and the like are conventionally known. (For example, see Patent Documents 1 to 7)
[0004]
[Patent Document 1]
JP-A-10-228355
[Patent Document 2]
JP-A-10-228357
[Patent Document 3]
JP-A-10-228364
[Patent Document 4]
JP-A-11-170632
[Patent Document 5]
JP 2000-341306 A
[Patent Document 6]
JP 2001-67309 A
[Patent Document 7]
JP 2001-67310A
[0005]
[Problems to be solved by the invention]
In the data transfer method using USB, termination of data transfer on the USB protocol is not specified. In the printer using the USB data transfer method, if the end of the data transfer cannot be determined, if the data transfer in IEEE1284.4 and the data transfer in non-IEEE1284.4 are mixed, a trouble occurs in the printing operation. .
[0006]
Therefore, whether or not the data transfer has been completed is usually determined by recognizing the short packet. In USB data transfer, if an attempt is made to transfer data larger than the maximum packet size, the data is divided into packet sizes and then transferred. For example, when performing full-speed bulk transfer, the maximum packet size is 64 bytes. When attempting to transfer 200 bytes of data by full-speed bulk transfer, the data is divided into 64 bytes, 64 bytes, 64 bytes, and 8 bytes and transferred.
[0007]
Thus, in the data transfer, the data transfer is performed with the maximum packet length until the last packet at the end of the data transfer, and the data transfer is performed only on the last packet with the data amount less than the maximum packet size. That is, it recognizes that data less than the maximum packet size has been transferred, and determines that data transfer has been completed.
[0008]
However, this alone cannot recognize that the data transfer has been completed when attempting to transfer data that is an integral multiple of the maximum packet size.
[0009]
Therefore, a method using a timer is usually used to detect the transfer end in data transfer of an integral multiple of the maximum packet size. In this method, even if data of the maximum packet length is transmitted, if there is no reception of the next packet for a predetermined time, it is determined that the data transfer has been completed.
[0010]
In this method, it is necessary to carefully set the time until it is considered that the data transfer is completed. Because, in the case of USB printer data transfer, when data is transferred by mixing IEEE1284.4 data and non-IEEE1284.4 data, if the setting time is too short, the CPU will use IEEE1284.4 data. Since the number of times of determining whether to perform data transfer or non-IEEE1284.4 data transfer increases, the data transfer speed decreases. Conversely, if the length is too long, the data transfer fails because the data break cannot be recognized.
[0011]
Generally, the method of recognizing the end of data transfer by USB is performed by combining the above-described method using a short packet and the method using a set time of a timer.
[0012]
The high-speed mode newly formulated in the USB standard Rev 2.0 standard is 40 times faster than the full-speed mode, but it is necessary to support the full-speed mode in order to maintain backward compatibility. Specifically, high-speed operation is required if the host device connected to the higher-level peripheral device supports high speed, and full-speed operation is required if the host device supports full speed. Is done.
[0013]
Therefore, if the time setting of the data transfer end recognition method is set to the same time as the full speed, the time setting is too long for the high speed operation. Similarly, the optimal setting time for the high speed mode is a time setting that is too short for the full speed mode.
[0014]
SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the related art, and an object of the present invention is to provide a data transfer method, an apparatus, and a printing method that enable reliable and high-speed data transfer in a high-speed compatible device. And a control program and a storage medium for a printing apparatus and a data transfer apparatus.
[0015]
[Means for Solving the Problems]
In order to achieve the above object, a data transfer method according to the present invention has a plurality of data transfer modes and has a function of mutually determining an actual data communication mode according to a data transfer mode supported by a host device, and A data transfer method for performing data transfer between a device and a peripheral device, comprising: a data transfer mode detecting step of detecting the data transfer mode; and A data transfer end detecting step of terminating data transfer when there is no reception, and a control step of controlling to change a set time of the timer according to the data transfer mode detected by the transfer mode detecting step. It is characterized by.
[0016]
In order to achieve the above object, the data transfer device of the present invention has a plurality of data transfer modes and has a function of mutually determining an actual data communication mode according to a data transfer mode supported by the host device, and A data transfer device for performing data transfer between a host-side device and a peripheral device, comprising: a data transfer mode detecting means for detecting the data transfer mode; Data transfer end detecting means for terminating data transfer when there is no data reception, and control means for controlling to change the set time of the timer according to the data transfer mode detected by the transfer mode detecting means. It is characterized by having.
[0017]
In order to achieve the above object, a printing method according to the present invention is characterized in that data is transferred by the data transfer method.
[0018]
In order to achieve the above object, a printing apparatus according to the present invention is characterized in that data is transferred by the data transfer apparatus.
[0019]
In order to achieve the above object, a control program for a data transfer device of the present invention has a plurality of data transfer modes and a function of mutually determining an actual data communication mode based on a data transfer mode supported by a host device. A computer-readable control program for controlling a data transfer device that performs data transfer between the host-side device and a peripheral device, the data transfer mode detecting step detecting the data transfer mode; A data transfer end detection step for terminating data transfer when there is no next data reception even after the time set in the timer has elapsed after the reception, and the timer according to the data transfer mode detected by the transfer mode detection step. And controlling the computer to change the set time of the computer. Characterized in that it consists of program code for causing.
[0020]
Further, in order to achieve the above object, a storage medium of the present invention stores the control program.
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0022]
(One embodiment)
First, an embodiment of the present invention will be described with reference to FIGS.
[0023]
FIG. 1 is a block diagram illustrating a configuration of a print system that performs data transfer by the data transfer device according to the present embodiment.
[0024]
In FIG. 1, reference numeral 101 denotes a host PC (personal computer) as a host-side device, and 102, a printer (printing device) as a peripheral device (device), which are connected to each other via an external bus 102. The printer 102 has a printer controller 104 and a printer engine 105.
[0025]
Then, the image data generated by the host PC 101 is transferred to the printer 102 via the external bus 102, and the printer 102 performs a print output process. The printer controller 104 controls an interface (I / F) with an external bus 103 used for communication with the host PC 101.
[0026]
That is, the printer controller 104 interprets a printer control command (converted image data) transferred from the host PC 101, generates bitmap data, accepts various image processing when generating bitmap data, and accepts user operations. Command transmission to the engine 105 is mainly performed.
[0027]
The printer engine 105 receives the bitmap data generated by the printer controller 104 and generates ejection timing data of an ink head (not shown), print processing, ink supply / recovery processing to the ink head, paper transport, and motors in the head operation. Control is mainly performed.
[0028]
Through the above processing, the image data received from the host PC 101 is printed out by the printer 103.
[0029]
FIG. 2 is a block diagram showing a configuration of the printer controller 104 in the printer system shown in FIG. 1. As shown in FIG. 2, the printer controller 104 includes a USB controller 201, a DMA (Direct Memory Access) controller 202, and a RAM (Random). Access Memory (203), ROM (Read Only Memory) 204, EEPROM (Electrically Erasable and Programmable Read Only Memory) 205, memory controller 206, operation panel 207, operation panel interface (operation panel I / F) IC 20, CPU A A20, CPU A 208, A20 (Application Specific Integrated Circuit) 210, SDRAM (Synchronous Dyn) AIC (Random Random Access Memory) 211 and an internal bus 212.
[0030]
The USB controller 201 has an end point buffer (EP buffer) 201a. The USB controller 201 is connected to the host PC 101 via USB, and the image processing ASIC 210 is connected to the printer engine 105.
[0031]
Next, USB will be briefly described.
[0032]
The USB data transfer basically includes three packets, that is, a token packet, a data packet, and a handshake packet. One data transfer composed of these three packets is called a transaction.
[0033]
The token packet stores a packet ID (identifier) indicating the type of transaction, an address of a peripheral device (device) that is a target of data transfer, and an endpoint number. Device) and the host-side device. This token packet can be generated only by the host device. This means that only the host device manages the bus access right. Transfer data is stored in the data packet. The handshake packet stores information indicating whether data transfer has been completed normally.
[0034]
There are three types of transactions: an in-transaction, an out-transaction, and a setup transaction. In the in-transaction, data is transferred from the peripheral device to the host device. In the out transaction, data is transferred from the host device to the peripheral device. The setup transaction is used to transfer a command specified by the standard from the host device to the peripheral device. These three transactions constitute a transfer called a bulk transfer, a control transfer, an isochronous transfer, and an interrupt transfer.
[0035]
Bulk transfer is a sequence of in-transactions or out-transactions. The control transfer is a setup transaction only, or a sequence of an in transaction and an out transaction following the setup transaction. An isochronous transfer is a sequence of in-transactions or out-transactions without a handshake packet. An interrupt transfer is one in-transaction.
[0036]
These transfers are arranged in 1 ms units called frames. This control is performed by the host external bus control unit. The start of a frame is notified by a special packet called a SOF (Start of Frame) packet. Among them, the bandwidths of the isochronous transfer and the interrupt transfer are secured in the frame. The bulk transfer is an asynchronous data transfer, and the control transfer is used to initialize a peripheral device external bus control unit connected to the bus. The isochronous transfer is a synchronous transfer, and a data transfer amount per unit time is secured.
[0037]
However, unlike other transfer, data is not guaranteed only for isochronous transfer. The interrupt transfer is used for interrupt processing because it is guaranteed that the transfer is always performed every set time. A μ frame is added in the USB standard Rev 2.0 specification. Data transfer in the high-speed mode is synchronized with a μ frame. The μ frame is 125 μs, which is ８ the length of the frame. The SOF uses the same SOF packet as the frame, and the SOF having the same frame number is issued eight times consecutively.
[0038]
The USB communication as described above is performed between the host device and the endpoint. A peripheral device can have a plurality of endpoints, and can be grouped into a plurality of endpoints to form a unit called an interface. The peripheral device can further have a plurality of interfaces, and the plurality of interfaces can be grouped to form a peripheral device configuration. By defining these interfaces and peripheral device (device) configurations, it is possible to flexibly cope with peripheral devices (devices) having complicated functions.
[0039]
Next, a data transfer method when the present invention is applied to a data transfer method using USB will be described with reference to FIG.
[0040]
Here, a case in which print data is transferred from the host PC 101 to the printer 102 will be described as an example. Also, here, an example will be described in which DMA transfer is used for data transfer from the endpoint buffer (EP buffer) 201a of the USB controller 201 to the memory.
[0041]
FIG. 3 is a flowchart showing a flow of operation in print data transfer when the data transfer device according to the present embodiment is applied.
[0042]
When transferring data to the printer 102, bulk OUT transfer is used.
[0043]
In the present embodiment, an example will be described in which print data is transferred from the host PC 101 to the printer 102 using USB bulk OUT transfer.
[0044]
First, prior to data transfer, a timer set time corresponding to the transfer mode is set (step S301), and then the DMA size is set to the Max packet size (step S302).
[0045]
A method of setting the time of the timer according to the transfer mode will be described later.
[0046]
When data transfer is started from the host PC 101 and the first packet is received (step S303), the data is subjected to the interpretation of the USB protocol by the serial interface engine in the USB controller 201, and the data size of the packet received in step S303 is obtained. Is determined to be the Max packet size (step S304), and the data is stored in the endpoint buffer 201a.
[0047]
If it is determined that the data size of the received packet is not the Max packet size, a short packet reception interrupt occurs (step S313). When the short packet reception interrupt is detected, a DMA transfer end request is issued (step S314), and the DMA is stopped.
[0048]
When the DMA is stopped, a DMA transfer end interrupt is generated from the DMA controller 202 (step S305). When the DMA transfer end interrupt is detected, it is determined whether the received data is IEEE1284.4 data (step S306). If it is determined that the data is IEEE1284.4, the processing in IEEE1284.4 is performed (step S315), and thereafter, the process returns to step S301.
[0049]
Here, description of the processing contents in IEEE1284.4 will be omitted.
[0050]
On the other hand, if it is determined in step S304 that the data size of the received packet is the Max packet size, a DMA transfer end interrupt occurs (step S305), and it is determined whether the data is IEEE1284.4 data. (Step S306). Then, as in the case of the short packet described above, if the data is IEEE1284.4, the processing in IEEE1284.4 is performed (step S315), and thereafter, the process returns to the step S302.
[0051]
If it is determined in step S306 that the received data is not IEEE1284.4, it is determined whether the first packet is a short packet (step S307). If it is determined that the first packet is a short packet, the data transfer has been completed, and the process returns to step S301.
[0052]
On the other hand, if it is determined in step S307 that the first packet is not a short packet, the DMA size is set again (step S308).
[0053]
Next, it is determined whether or not the packet has been received within the set time (step S309). If it is determined that the next packet is not received within the set time, a DMA transfer end request is issued (step S317), a DMA transfer end interrupt occurs, and the DMA transfer ends (step S312). The process returns to step S301.
[0054]
On the other hand, if it is determined in step S309 that the next packet has been received within the set time, it is determined whether the size of the received packet is the Max packet size. If the size of the received packet is a short packet, a short packet interrupt is generated (step S316), a DMA transfer end request is issued (step S317), and a DMA transfer end interrupt is generated (step S312). After the transfer is completed, the process returns to step S302.
[0055]
On the other hand, if it is determined in step S310 that the size of the packet received within the set time is the Max packet size, it is determined whether the transfer of the DMA data has been completed (step S311). If it is determined that the transfer of the DMA data is not completed, the process returns to the step S309.
[0056]
On the other hand, if data of the set DMA size is received as compared with the preset DMA size, the DMA transfer is completed, and the determination result in the first embodiment described above in step S311 is: Since the result is affirmative (YES) and a DMA transfer end interrupt occurs (step S312), the process returns to step S302.
[0057]
If the data of the set DMA size has not been received, it is not known whether or not the next data packet is transmitted from the host PC 101. When the next packet arrives, DMA transfer is performed, and if no data is received even after the set time has elapsed, the DMA transfer is terminated.
[0058]
The determination as to whether or not a packet has been received may be made using an interrupt generated when the endpoint buffer 201a becomes full. Alternatively, the amount of data transferred may be counted, and whether or not a packet has been received may be determined based on whether or not the data transfer amount has changed.
[0059]
By performing data transfer by repeating the above operations, efficient data transfer can be realized.
[0060]
Next, a method of detecting the data transfer mode and a method of setting the set time of the timer will be described.
[0061]
Switching of the set time of the timer may be performed at the time of bus enumeration (data transfer speed detection) at the time of USB connection.
[0062]
The method will be described below.
[0063]
First, the printer controller 104 is initialized by turning on the power of the printer. At this time, the USB controller is initialized. At this point, the time for full speed is set in the timer setting.
[0064]
Thereafter, when the printer 102 and the host PC 101 are connected by USB, USB bus enumeration is performed. When the printer 102 and the host PC 101 are not connected, USB bus enumeration is performed at the time when the connection is made.
[0065]
The USB device can transition to the device state shown in FIG. 4 and enter the idle state.
[0066]
Hereinafter, a specific operation at the time of USB bus enumeration will be described.
[0067]
FIG. 4 is a device state diagram for describing the operation at the time of enumeration.
(1) When a USB device is connected to a hub (Hub), the hub notifies the host PC 101 of a status change. At this time, the USB device is in the attached (connection) state (401 in FIG. 4), and the port to which the USB device is connected is disabled.
(2) The host PC 101 inquires of the hub why the status has changed.
(3) The host PC 101 knows that a new device has been connected, and also knows which port it has been connected to. The host PC 101 issues a port enable / reset command to a port to which a new device is connected. The power state (402 in FIG. 4) is entered.
(4) The hub holds a reset signal to the port to which the new device is connected for 10 ms. When the reset signal is released, the port is enabled, and the hub supplies 100 mA of bus current to the USB device. The USB device is now in the Default (default) state (403 in FIG. 4). The USB device will be able to respond to the default address.
(5) Until the USB device receives a unique address, the default pipe can be accessed through the default address. The host PC 101 reads the device descriptor and determines the maximum data payload size that can be used by the default pipe.
(6) The host PC 101 assigns a unique address to the USB device, and moves the device to the Address (address assignment) state (404 in FIG. 4).
(7) The host PC 101 reads the respective configurations 0 to n in order to read the configuration information from the USB device. Several frames may be required to complete this process.
(8) Based on the configuration information and the method of using the UAB device, the host PC 101 allocates a configuration value to the device. The device is now configured
(Configuration) State (405 in FIG. 4), and all the endpoints in this configuration have the described characteristics. A USB device can obtain the amount of Vbus power described in its configuration descriptor. From a device perspective, the device is in a usable (idle) state.
[0068]
The USB device makes a state transition as described above before connecting to the bus and becoming usable. USB full-speed (FS) and high-speed (HS) arbitration is also performed during the state transition. Specifically, this is performed when the reset signal of (4) is held for 10 ms. When the HS-compatible device detects the reset signal while the hub holds the reset signal, the HS-compatible device first pulls up the D + line similarly to the FS-compatible device. After that, the HS-compatible device drives the D + and D- lines to the K state to notify the hub that the device is an HS-compatible device (referred to as a device Chirp).
[0069]
When the hub detects the device Chirp, it notifies the device that the device is an HS-compatible hub by alternately driving the D + and D- lines between the K state and the J state (referred to as a hub Chirp).
[0070]
When the device Chirp and the hub Chirp can confirm that they are HS-compatible devices, the high-speed mode is set.
[0071]
The high-speed and full-speed arbitration methods are based on the above-described means. Therefore, the USB device recognizes which one of the high-speed mode and the full-speed mode is used for the data transfer means. At the time of the arbitration, the USB device sets in the register whether to use the high-speed mode or the full-speed mode in the register, so that the printer controller 104 can use either of the transfer modes. It can be recognized whether or not. If either one of the transfer modes does not support HS, the full speed mode is set.
[0072]
By the above arbitration, in the default state where communication in the high-speed mode is determined, the register indicating the transfer mode is referred to, and when the transfer mode in the high-speed mode is adopted, the timer setting time is set. Switch to high speed time setting.
[0073]
According to the method described above, switching of the timer setting time at the time of enumeration can be realized.
[0074]
Note that the present invention is not limited to the above-described embodiment, and various applications are possible.
[0075]
In the above-described embodiment, an inkjet printer has been described as an example. However, the present invention is applicable to various peripheral devices such as a case where a USB is used for data transfer of a laser beam printer (LBP) or a storage device. It is possible.
[0076]
In addition, the present invention may be applied not only to peripheral devices but also to a host device.
[0077]
Further, in the above-described embodiment, the timer setting until the next packet reception is performed by software, but may be performed by hardware.
[0078]
(Other embodiments)
The present invention can be applied to a system including a plurality of devices (eg, a host computer, an interface device, a reader, a printer, etc.), but can also be applied to a device including a single device (eg, a copier, a facsimile machine, etc.). May be.
[0079]
Further, an object of the present invention is to supply a storage medium in which a program code of software for realizing the functions of the above-described embodiments is recorded to a system or an apparatus, and a computer (or CPU, MPU or the like) of the system or apparatus stores the storage medium. Needless to say, this can also be achieved by reading and executing the program code stored in the medium.
[0080]
In this case, the program code itself read from the storage medium realizes the functions of the above-described embodiment, and the storage medium storing the program code constitutes the present invention.
[0081]
A storage medium storing software program codes for realizing the functions of the above-described embodiments is supplied to a system or an apparatus, and a computer (or CPU, MPU, or the like) of the system or apparatus executes the program code stored in the storage medium. It goes without saying that the present invention is also achieved by reading and executing.
[0082]
In this case, the program code itself read from the storage medium implements the functions of the above-described embodiment, and the storage medium storing the program code constitutes the present invention.
[0083]
Examples of storage media for supplying the program code include RAM, NV-RAM, floppy (registered trademark) disk, hard disk, optical disk, magneto-optical disk, MO, CD-ROM, CD-R, and CD-RW. , A DVD (DVD-ROM, DVD-R, DVD-RW, etc.), a magnetic tape, a non-volatile memory card, another ROM, etc., as long as the program code can be stored, or a download via a network. Can be used.
[0084]
When the computer executes the readout program code, not only the functions of the above-described embodiments are realized, but also an OS (Operating System) or the like running on the computer based on the instruction of the program code. It goes without saying that a part or all of the actual processing is performed and the functions of the above-described embodiments are realized by the processing.
[0085]
Further, after the program code read from the storage medium is written into a memory provided in a function expansion board inserted into the computer or a function expansion unit connected to the computer, the function expansion is performed based on the instruction of the program code. It goes without saying that a CPU or the like provided in the board or the function expansion unit performs a part or all of the actual processing, and the processing realizes the functions of the above-described embodiments.
[0086]
【The invention's effect】
As described above, according to the present invention, the timer setting time can be set in accordance with the transfer mode, and in a high-speed compatible device, both in the full-speed transfer mode and the high-speed transfer mode, reliable and high-speed Data transfer can be realized. Further, by using the data transfer method for a printing apparatus, a high-speed printing apparatus can be obtained.
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating a configuration of a print system that performs data transfer by a data transfer device according to an embodiment of the present invention.
FIG. 2 is a block diagram illustrating a configuration of a printer controller in a print system that performs data transfer by the data transfer device according to one embodiment of the present invention.
FIG. 3 is a flowchart illustrating an operation flow when print data is received using USB in a print system that performs data transfer by the data transfer device according to the embodiment of the present invention.
FIG. 4 is a device state diagram for explaining an operation at the time of enumeration in the data transfer device according to one embodiment of the present invention.
[Explanation of symbols]
101 Host PC
102 Printer
103 External bus
104 Printer controller
105 Printer Engine
201 USB controller
202 DMA controller
203 RAM
204 ROM
205 EEPROM
206 Memory controller
207 Operation panel
208 Operation panel I / F
209 CPU
210 Image Processing ASIC
211 SDRAM

Claims (30)

A data transfer method having a plurality of data transfer modes, having a function of mutually determining an actual data communication mode according to a data transfer mode supported by a host device, and performing data transfer between the host device and a peripheral device And
A data transfer mode detecting step of detecting the data transfer mode,
A data transfer end detection step of terminating data transfer when there is no next data reception even after the time set in the timer has elapsed after data reception;
Controlling the timer to change the set time of the timer according to the data transfer mode detected by the transfer mode detecting step. The data transfer method according to claim 1, wherein the data transfer mode is a communication speed at which data is transferred. 2. The data transfer method according to claim 1, wherein the host device is a computer. The method according to claim 1, wherein the peripheral device is a printer. 2. The data transfer method according to claim 1, wherein the data transfer end detecting step is provided in firmware of the device side device. 2. The data transfer method according to claim 1, wherein the data transfer end detecting step is provided in hardware of the device-side device. 2. The data transfer method according to claim 1, further comprising a determining step of determining whether data transfer is performed. 8. The data transfer according to claim 7, wherein the determining step includes an ability to count the amount of transferred data, and determines whether or not data transfer is performed based on a change in the amount of data transferred counted by this function. Method. 9. The data transfer method according to claim 1, wherein a serial bus used for data transfer conforms to USB@Rev2.0 and supports a high-speed mode. A data transfer device having a plurality of data transfer modes and having a function of mutually determining an actual data communication mode according to a data transfer mode supported by a host device, and performing data transfer between the host device and a peripheral device And
Data transfer mode detecting means for detecting the data transfer mode,
Data transfer end detection means for terminating data transfer when there is no next data reception even after the time set in the timer has elapsed after data reception;
Control means for controlling so as to change the set time of the timer in accordance with the data transfer mode detected by the transfer mode detecting means. The data transfer device according to claim 10, wherein the data transfer mode is a communication speed at which data is transferred. The data transfer device according to claim 10, wherein the host-side device is a computer. The data transfer device according to claim 10, wherein the peripheral device is a printer. 11. The data transfer apparatus according to claim 10, wherein the data transfer end detection unit is provided in firmware of the device. 11. The data transfer apparatus according to claim 10, wherein the data transfer end detection means is provided in hardware of the device. The data transfer device according to claim 10, further comprising a determination unit configured to determine whether data transfer is performed. 17. The data transfer method according to claim 16, wherein said determination means has an ability to count the amount of transferred data, and determines the presence or absence of data transfer based on a change in the data transfer amount counted by this function. apparatus. 18. The data transfer device according to claim 10, wherein a serial bus used for data transfer conforms to USB @ Rev 2.0 and supports a high-speed mode. A printing method for transferring data by the data transfer method according to claim 1. A printing apparatus for transferring data by the data transfer apparatus according to claim 10. A data transfer device having a plurality of data transfer modes and having a function of mutually determining an actual data communication mode according to a data transfer mode supported by a host device, and performing data transfer between the host device and a peripheral device A computer-readable control program for controlling the
A data transfer mode detecting step of detecting the data transfer mode, a data transfer end detecting step of terminating the data transfer when there is no next data reception even after the time set in the timer has elapsed after the data reception; And a control step of controlling the timer to change the set time of the timer in accordance with the data transfer mode detected by the mode detecting step. . 22. The control program according to claim 21, wherein the data transfer mode is a communication speed at which data is transferred. 22. The control program according to claim 21, wherein the host-side device is a computer. 22. The control program according to claim 21, wherein the peripheral device is a printer. 22. The control program according to claim 21, wherein the data transfer end detecting step is provided in firmware of the device. 22. The control program according to claim 21, wherein the data transfer end detecting step is provided in hardware of the device-side device. 22. The control program for a data transfer device according to claim 21, comprising a program code for causing a computer to execute a determination step of determining whether data transfer is performed. 28. The data transfer according to claim 27, wherein the determining step includes an ability to count the amount of transferred data, and determines whether data transfer is performed based on a change in the amount of data transferred counted by this function. Device control program. 29. The control program according to claim 21, wherein a serial bus used for data transfer conforms to USB@Rev2.0 and supports a high-speed mode. A storage medium storing the control program according to claim 21.

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