JP2002229925A - Data processing unit with multiple logical channel communication facility, data processor and recording device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multiple logical channel communication facility such that a plurality of logical channels can communicate independently without obstructing each other. SOLUTION: Transmitted data are stored in a FIFO memory 202. The reception data are read out from the FIFO memory 202, and the logical channels are identified. Then, buffers 104 to 106 corresponding to the identified logical channels are selected, the pieces of the reception data other than ones used for the channel identification are read out from the FIFO memory 202, and are transferred to the selected buffers.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data processing device, a data processing method, and a recording device having a multiplex logical channel communication function.

[0002]

2. Description of the Related Art Multiple logical channel communication in which data transmission / reception processing is performed using a plurality of logical channels is widely used in a LAN or the like in which a large number of terminals and a center device are connected. On the other hand, with the recent improvements in the functions of personal computers, especially network functions, multiple logical channel communication functions have become available not only for personal computers, but also for peripheral devices connected to the personal computers, particularly printers such as printers. It has been demanded. In particular, IEEE P1284, which is an interface widely used for connecting a personal computer and a printer.
IEEE P128, which is assumed to be operated on
A multiple logical channel communication protocol of 4.4 (Draft 1.70 issued on April 13, 1998) has also been proposed.

[0003]

In a conventional recording apparatus, due to cost restrictions, all data transmitted by a host computer is stored in a reception buffer at any time without discrimination between control commands and print data. In many cases, this configuration is adopted.

Incidentally, the above-mentioned IEEE P1284.
In multiplex logical channel communication, it is necessary to guarantee that a plurality of logical channels can communicate independently without blocking each other. Generally, in a recording device, the communication amount of print data is very large compared to the communication amount other than print data such as a control command, and therefore, for example, a logical channel dedicated to control commands and a logical channel dedicated to print data are provided. Even if
As in the case of the conventional recording apparatus, if a configuration is adopted in which all received data is stored in the same reception buffer regardless of the logical channel, logical channels other than the logical channel for print data are blocked. May be lost.

Accordingly, an object of the present invention is to provide
An object of the present invention is to provide a data processing device, a data processing method, and a recording device such as a printer having a multiplex logical channel communication function so that a plurality of logical channels can communicate independently without blocking each other.

[0006]

According to one aspect of the present invention, there is provided a data processing apparatus having a data communication function of a multiplex logical channel, comprising: Logical channel identifying means for identifying a channel, and storing means for storing, for each logical channel, data other than the data used for identifying the logical channel among the received data based on the identification result by the logical channel identifying means. Is provided.

According to a second aspect of the present invention, in the data processing apparatus according to the first aspect, the storage means is a plurality of buffers provided for each logical channel.

According to a third aspect of the present invention, in the data processing apparatus according to the first aspect, the logical channel identification means is provided in a data receiving unit for storing the received data.

According to a fourth aspect of the present invention, in the data processing apparatus according to the first aspect, the microprocessor for inputting the received data also serves as the logical channel identification means.

According to a fifth aspect of the present invention, there is provided a recording apparatus comprising the data processing apparatus according to any one of the first to fourth aspects, and performing image formation based on the received data.

According to a sixth aspect of the present invention, there is provided a data processing device having a data communication function of a multiplex logical channel,
Data receiving means for receiving data transferred from the outside, logical channel identifying means for identifying a logical channel of the received data from the data received by the data receiving means, and a logical channel for receiving the data received by the data receiving means. Buffer means for storing each of the buffer means, buffer selecting means for selecting the buffer means according to the identification result of the logical channel identifying means, and for the selected buffer means, the logical channel identifying means used for logical channel identification. Receiving data writing means for writing data other than the above from the data receiving means.

According to a seventh aspect of the present invention, in the data processing apparatus according to the sixth aspect, the data receiving means can store at least received data sufficient for the logical channel identification means to specify a logical channel. Having a configuration.

The present invention according to claim 8 is a data processing apparatus having a data communication function of a multiplex logical channel,
Data receiving means for receiving data transferred from the outside, and buffer means for storing data received by the data receiving means for each logical channel, wherein the data receiving means comprises: receiving data from the received data; Logical channel identifying means for identifying the logical channel of the above, buffer selecting means for selecting the buffer means according to the identification result of the logical channel identifying means, and for the selected buffer means, the logical channel identifying means Receiving data writing means for writing data other than the data used for identification from the receiving means.

According to a ninth aspect of the present invention, in the data processing apparatus of the eighth aspect, the data receiving means can store at least received data sufficient for the logical channel identification means to specify a logical channel. Having a configuration.

According to a tenth aspect of the present invention, there is provided a recording apparatus comprising the data processing apparatus according to any one of the sixth to ninth aspects, wherein the recording apparatus forms an image based on the data received by the data receiving means.

The present invention according to claim 11 is a data processing method for performing data communication of multiple logical channels, comprising: a logical channel identifying step of identifying a logical channel of data received from the outside; and a logical channel identifying step. And storing, on the basis of the identification result, data other than the data used for identifying the logical channel among the received data, for each logical channel.

According to a twelfth aspect of the present invention, in the data processing method according to the eleventh aspect, the storing step uses a plurality of buffers provided for each logical channel.

According to a thirteenth aspect of the present invention, in the data processing method according to the eleventh aspect, the logical channel identification step is performed by a data receiving unit that stores the received data.

According to a fourteenth aspect of the present invention, in the data processing method according to the eleventh aspect, the logical channel identification step is executed by a microprocessor that inputs the received data.

The present invention according to claim 15 is based on the data processing method according to any one of claims 11 to 14,
This is a recording method for forming an image based on the received data.

The present invention according to claim 16 is a data processing method for performing data communication of a multiplex logical channel, comprising: a data receiving step of receiving data transferred from outside; and a data receiving step of the data receiving step. A logical channel identifying step of identifying a logical channel of the received data from a buffer selecting step of selecting buffer means for storing the data received in the data receiving step for each logical channel according to the identification result of the logical channel identifying step. Receiving data writing step of writing data other than the data used for the logical channel identification in the logical channel identification step to the selected buffer means.

According to a seventeenth aspect of the present invention, in the data processing method of the sixteenth aspect, the data receiving step can store at least received data sufficient to specify a logical channel in the logical channel identification step. Use memory.

The present invention according to claim 18 is a data processing method having a data communication function of a multiple logical channel, comprising the steps of receiving data transferred from outside, and inputting the received data to a microprocessor. hand,
Identifying a logical channel of the received data, selecting one of a plurality of buffers based on the result of the identification, and, for the selected buffer, Writing received data.

According to a nineteenth aspect of the present invention, in the data processing method according to the eighteenth aspect, the step of receiving the data includes a step of identifying the logical channel by at least a step of identifying the logical channel. Use a memory that can store data.

According to a twentieth aspect of the present invention, there is provided a recording method for receiving data from outside using the data processing method according to any one of the sixteenth to nineteenth aspects, and forming an image based on the received data. .

According to a twenty-first aspect of the present invention, as a data processing method for performing data communication of a multiplex logical channel, a logical channel identifying step of identifying a logical channel of data received from outside, and an identification result by the logical channel identifying step. A storage step of storing, for each logical channel, data other than the data used for identifying the logical channel among the received data, in the form of a readable program.

According to a twenty-second aspect of the present invention, in the storage medium according to the twenty-first aspect, the storing step uses a plurality of buffers provided for each logical channel.

According to a twenty-third aspect of the present invention, in the storage medium according to the twenty-first aspect, the logical channel identification step is performed by a data receiving unit that stores the received data.

According to a twenty-fourth aspect of the present invention, in the storage medium according to the twenty-first aspect, the logical channel identification step is executed by a microprocessor that inputs the received data.

According to a twenty-fifth aspect of the present invention, there is provided a recording medium storing, in the form of a readable program, performing image formation based on received data based on the steps according to any one of the twenty-first to twenty-fourth aspects. It is.

According to a twenty-sixth aspect of the present invention, as a data processing method for performing data communication of a multiplex logical channel, a data receiving step of receiving data transferred from the outside; A logical channel identifying step of identifying a logical channel of data; a buffer selecting step of selecting buffer means for storing data received in the data receiving step for each logical channel based on an identification result of the logical channel identifying step; And a receiving data writing step of writing data other than the data used for the logical channel identification in the logical channel identification step in the buffer means.

According to a twenty-seventh aspect of the present invention, in the storage medium according to the twenty-sixth aspect, the data receiving step stores at least received data sufficient to specify a logical channel in the logical channel identification step. Is used.

According to a twenty-eighth aspect of the present invention, as a data processing method having a data communication function of a multiplex logical channel,
Receiving data transferred from outside;
Inputting the received data to a microprocessor, identifying a logical channel of the received data, selecting one of a plurality of buffers based on a result of the identification, hand,
And writing the received data other than the data used for the logical channel identification in the form of a readable program.

According to a twenty-ninth aspect of the present invention, in the storage medium according to the twenty-eighth aspect, the step of receiving the data includes at least receiving data sufficient to specify a logical channel in the step of identifying the logical channel. Is used.

According to a thirtieth aspect of the present invention, there is provided a recording medium storing, in the form of a readable program, an image formation based on received data based on the steps according to any one of the twenty-sixth to twenty-ninth aspects. It is.

The present invention according to claim 31 is the invention according to claims 21 to
30. In the storage medium according to any one of the above, as the storage medium, a floppy disk, a hard disk, a magneto-optical disk storing a program that can be read by a server computer and a client computer,
An optical disk, a CD-ROM, a CD-R, a magnetic tape, a nonvolatile memory card, and a ROM are used.

The present invention according to claim 32 is the invention according to claims 21 to
30. The storage medium according to any one of 30), wherein the storage medium is detachable from a server computer and a client computer.

According to a thirty-third aspect of the present invention, there is provided a program for causing a computer to execute a data processing procedure for performing data communication of multiple logical channels, the program comprising: a logical channel for identifying a logical channel of data received from outside An identification step; and a storage step of storing, for each logical channel, data other than the data used for identifying the logical channel among the received data, based on an identification result of the logical channel identification step.

According to a thirty-fourth aspect of the present invention, there is provided a program for causing a computer to execute a data processing procedure for performing data communication on multiple logical channels, the program comprising a data receiving step for receiving data transferred from outside. And a logical channel identifying step of identifying a logical channel of the received data from the data received in the data receiving step; and storing the data received in the data receiving step for each logical channel according to the identification result of the logical channel identifying step. And a receiving data writing step of writing data other than the data used for the logical channel identification in the logical channel identification step in the selected buffer means.

The present invention according to claim 35 is a program for causing a computer to execute a data processing procedure having a data communication function of a multiplex logical channel, the program comprising a step of receiving data transferred from the outside. , Input the received data into the microprocessor,
Identifying a logical channel of the received data, selecting one of a plurality of buffers based on the result of the identification, and, for the selected buffer, Writing received data.

[0041]

Embodiments of the present invention will be described below in detail with reference to the drawings.

Embodiment 1 FIG. 1 is a block diagram showing a control mechanism of a recording apparatus according to a first embodiment of the present invention. In this figure, 101
Denotes a microprocessor, which controls the entire recording apparatus according to the present embodiment according to a program stored in the ROM.

The interface unit 102 controls connection between an external device (not shown) such as a host computer and the recording apparatus. The print data and the control command transmitted by the host computer (not shown) are received by the interface unit 102, and transmitted to the buffers 0 to 0 via the multiplex logical channel communication control unit 103.
The data is stored in one of the buffers 2 (104 to 106).

In this embodiment, it is assumed that multiplex logical channel communication of three channels is performed, and a channel for managing multiplex logical channel communication (hereinafter referred to as channel 0).
Is stored in a buffer 0 (104), and all data of a print data channel (hereinafter referred to as channel 1) is stored in a buffer 1 (105). The data of channel 2 is stored in the buffer 2.

The print buffer 111 is a buffer for storing an amount of print data required for one printing, and the print data read from the buffer 1 by the microcomputer 101 is sequentially stored.

The print control unit 112 controls transfer of print data to the print head, reads print data from the print buffer 111 in accordance with a print control signal from the microcomputer 101, and transfers the print data to the print head according to a predetermined drive timing. I do.

In the configuration described above, the microcomputer 101 performs printing by the recording head 113 and CR
(Carriage) motor 109, LF (transport) motor 11
By controlling the rotation of 0, an image is formed on the recording medium in accordance with the print data.

FIG. 2 is a block diagram showing the internal configuration of the multiplex logical channel communication control section 103 shown in FIG.

The data receiving unit 1031 comprises a channel identifying unit 201 and a FIFO memory 202.
The data that has passed through the interface unit 102 is temporarily stored in the FIFO memory 202, and the channel identification unit 201 specifies which logical channel the data is.

In multiplex logical channel communication, communication data always includes information about a logical channel. For example, communication data has a structure as shown in FIGS. 3 (a) and 3 (b). If so, the logical channel can be specified from the first two bits.

FIG. 3C shows an example of the IEEE P12.
84.4 indicates a data structure defined in this case. In this case, a logical channel can be specified from a combination of a first socket ID (1 byte length) and a second socket ID (1 byte length). .

The FIFO memory 202 of the data receiving unit 1031 must be at least large enough to store the amount of data required to specify a logical channel. Therefore, the data structure of the communication data is shown in FIG.
(A), at least 2 bits, IEEE
In the case of P1284.4 compliant (FIG. 3C), a size of at least 2 bytes (16 bits) is required.

When the logical channel of the received data is specified by the channel identifying unit 201 shown in FIG. 2, the buffer selecting unit 1032 selects a buffer corresponding to the specified logical channel, and Connect the output signal to the input terminal of the selected buffer.

Note that the buffer writing unit 1033
It exists to control data transfer from the O memory 202 to the buffer selected. Specifically, this is because the information obtained by removing the information used to specify the logical channel from the contents of the FIFO memory 202 is stored in the selected buffer.

Then, the microprocessor 101 reads data from each buffer (each channel) according to a predetermined time schedule and sequentially processes the data.

FIG. 5 is a flowchart showing the processing procedure of the microprocessor 101 (stored in the form of a program in the ROM). In this figure, step S
In step 1, the transmitted data is stored in a FIFO memory. In step S2, the received data is read from the FIFO memory. In step S3, a logical channel is identified from the read received data. In step S4, a buffer corresponding to the specified logical channel is selected.
In step S5, the received data other than the data used for specifying the channel is read from the FIFO memory. In step S6, the read data is transferred to the selected buffer.

With the above configuration, the data amount (communication amount)
Logical channel (channel 1) for print data with many
Other logical channels (channel 0, channel 2) can be completely disconnected. Therefore, for example, when the data processing related to printing by the microprocessor 101 is interrupted for some reason, the buffer for channel 1 becomes full, and it is no longer possible to receive print data (that is, the channel 1 is blocked). If so, the effect does not affect other logical channels.

Even when the printing operation of the print data being transmitted is stopped or postponed, the stop command or the postponement command is sent to the channel for controlling the recording device (in this embodiment, channel 2). If you send the print data at the same time, you can immediately stop or postpone printing, and if only one print data has already been sent and another print data is being sent, It is possible to disable it.

In this embodiment, the microcomputer 101 performs processing for transmission from the recording apparatus to an external host computer (not shown) without providing a mechanism for multiplex logical channel communication. However, since the amount of data transmitted from the recording apparatus to the host computer is very small and the possibility of blocking the logical channel is low, the configuration of the present embodiment does not cause any practical problem. The interface and protocol governed by the interface unit 102 are IEEE
It is needless to say that the present invention is not limited to the EP1284, but may be anything.

Embodiment 2 FIG. 4 is a block diagram showing a control mechanism of a recording apparatus according to a second embodiment of the present invention. In the figure, components having the same functions as those in FIG. 1 are denoted by the same reference numerals.

The present embodiment has a configuration in which the functions other than the FIFO function are removed from the multiplex logical channel communication control section 103 shown in FIGS. 1 and 2, and the multiplex logical channel communication control section in the first embodiment. The function controlled by 103 is substituted by the microprocessor 101.

That is, the data transmitted via the interface unit 102 is stored in the reception buffer 401,
After the microprocessor 101 reads out the content and specifies the logical channel, it is stored in one of the buffers 104 to 106 by the microprocessor 101.

In this embodiment, as in the first embodiment, a mechanism for multiplex logical channel communication is not particularly provided for transmission from the recording apparatus to a host computer (not shown). As described above, there is no practical problem.

The present embodiment requires less hardware than the first embodiment, and is advantageous in terms of cost.

When the interface unit 102 controls an extremely low-speed interface and protocol, the receiving buffer 401 may be removed and the microprocessor 191 may directly process data received via the interface unit 102. Good.

Further, in both the first embodiment and the second embodiment, dedicated buffers 104 to 106 are provided for each logical channel. Alternatively, the same physical memory or another area of the buffer may be allocated.

According to the present invention, a storage medium storing a program code of software for realizing the functions of the above-described embodiments is supplied to a system or an apparatus, and a computer (or CPU or MPU) of the system or the apparatus is provided. Can also be achieved by reading and executing the program code stored in the storage medium.

In this case, the program code itself read from the storage medium realizes the novel function of the present invention, and the storage medium storing the program code constitutes the present invention.

As a storage medium for supplying the program code, for example, a floppy disk, hard disk, magneto-optical disk, optical disk, CD-ROM, C
A DR, a magnetic tape nonvolatile memory card, a ROM, or the like can be used.

The functions of the above-described embodiment are implemented when the computer executes the readout program code. In addition, the OS or the like running on the computer is executed based on the instructions of the program code. Some or all of the processing is performed, and the functions of the above-described embodiments can also be realized by the processing.

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, based on the instructions of the program code, The CPU or the like provided in the function expansion board or function expansion unit performs part or all of the actual processing, and the functions of the above-described embodiments can also be realized by the processing.

The present invention is also applicable to a case where the program is delivered from a storage medium storing a program code of software for realizing the functions of the above-described embodiments to a requester via a communication line such as a personal computer communication. It goes without saying that you can do it.

[0073]

As described above, according to the present invention,
A multiplex logical channel communication function can be added to a recording device such as a printer so that a plurality of logical channels can communicate independently without blocking each other.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a control mechanism of a printing apparatus according to a first embodiment of the present invention.

FIG. 2 is a multiplex logical channel communication control unit 101 shown in FIG.
FIG. 2 is a block diagram showing an internal configuration of the device.

FIG. 3 is a diagram illustrating an example of a data structure of communication data used in multiplex logical channel communication.

FIG. 4 is a block diagram illustrating a control mechanism of a printing apparatus according to a second embodiment of the present invention.

FIG. 5 is a flowchart illustrating a processing procedure of the microcomputer 101 according to the first embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 101 Microprocessor 102 Interface unit 103 Multiple logical channel communication control unit 104 Buffer 0 105 Buffer 1 106 Buffer 2 107 CR motor driver 108 LF motor driver 109 CR motor 110 LF motor 111 Print buffer 112 Print control unit 113 Recording head 1031 Data receiving unit 1032 buffer selection unit 1033 buffer writing unit 201 channel identification unit 202 FIFO memory 401 reception buffer

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2C087 AB06 AC02 BA03 BA05 BC02 BC07 BC12 BC13 BC14 BC15 BD46 2C187 AC02 AE06 5B014 GC02 GC05 GC21 5B021 BB01 BB09 BB14 DD20 5B077 DD02 DD06

Claims (35)

[Claims] 1. A data processing device having a data communication function of a multiplex logical channel, comprising: a logical channel identifying unit for identifying a logical channel of data received from the outside;
Storage means for storing, for each logical channel, data other than the data used for identifying the logical channel among the received data. 2. The data processing device according to claim 1, wherein said storage means is a plurality of buffers provided for each logical channel. 3. The data processing device according to claim 1, wherein the logical channel identification unit is provided in a data receiving unit that stores the received data. 4. The data processing apparatus according to claim 1, wherein the logical channel identification unit is also used by a microprocessor that inputs the received data. 5. A recording device comprising the data processing device according to claim 1, wherein the recording device performs image formation based on the received data. 6. A data processing device having a data communication function of a multiple logical channel, comprising: a data receiving means for receiving data transferred from outside; and a logical channel for receiving data from the data received by the data receiving means. A logical channel identifying unit for identifying data, a buffer unit for storing data received by the data receiving unit for each logical channel, a buffer selecting unit for selecting the buffer unit based on an identification result of the logical channel identifying unit, A data processing device, comprising: a received data writing unit that writes data other than the logical channel identification unit used for logical channel identification from the data reception unit to the buffer unit. 7. The data processing apparatus according to claim 6, wherein said data receiving means can store at least received data sufficient for said logical channel identification means to specify a logical channel. apparatus. 8. A data processing device having a data communication function of a multiplex logical channel, comprising: a data receiving means for receiving data transferred from the outside; Buffer means for storing, the data receiving means, a logical channel identifying means for identifying a logical channel of the received data from the received data, and a buffer selecting means for selecting the buffer means according to the identification result of the logical channel identifying means Means for writing, to the selected buffer means, data other than the data used by the logical channel identification means for logical channel identification from the reception means. . 9. The data processing apparatus according to claim 8, wherein said data receiving means can store at least received data sufficient for said logical channel identification means to specify a logical channel. apparatus. 10. A recording device comprising the data processing device according to claim 6, wherein the recording device performs image formation based on data received by the data receiving means. 11. A data processing method for performing data communication of a multiplex logical channel, comprising: a logical channel identifying step of identifying a logical channel of data received from the outside; and Storing a data of the received data other than the data used for identifying the logical channel for each logical channel. 12. The data processing method according to claim 11, wherein said storing step uses a plurality of buffers provided for each logical channel. 13. The data processing method according to claim 11, wherein the logical channel identification step is executed by a data receiving unit that stores the received data. 14. The data processing method according to claim 11, wherein the logical channel identification step is executed by a microprocessor that inputs the received data. 15. A recording method, wherein an image is formed based on the received data based on the data processing method according to claim 11. 16. A data processing method for performing data communication on multiple logical channels, comprising: a data receiving step of receiving data transferred from outside; and a logical channel of received data from the data received in the data receiving step. A logical channel identifying step for identifying; a buffer selecting step for selecting buffer means for storing data received in the data receiving step for each logical channel according to an identification result of the logical channel identifying step; and the selected buffer means A data write method for writing data other than data used for logical channel identification in the logical channel identification step. 17. The data processing method according to claim 16, wherein the data receiving step uses a memory capable of storing at least received data sufficient to specify a logical channel in the logical channel identification step. Data processing method. 18. A data processing method having a data communication function of a multiplex logical channel, comprising the steps of: receiving data transferred from the outside; and inputting the received data to a microprocessor; Identifying, based on the result of the identification, selecting one of a plurality of buffers; and writing received data other than the data used for the logical channel identification to the selected buffer. A data processing method comprising: 19. The data processing method according to claim 18, wherein the step of receiving the data includes at least a memory capable of storing received data sufficient to specify a logical channel in the step of identifying the logical channel. A data processing method characterized by using. 20. Receiving data from the outside by using the data processing method according to claim 16,
A recording method, wherein an image is formed based on the received data. 21. A data processing method for performing data communication of a multiplex logical channel, comprising: a logical channel identifying step of identifying a logical channel of data received from the outside;
A storage step of storing, for each logical channel, data other than the data used for identifying the logical channel among the received data, in the form of a readable program. 22. The storage medium according to claim 21, wherein said storage step uses a plurality of buffers provided for each logical channel. 23. The storage medium according to claim 21, wherein the logical channel identification step is executed by a data receiving unit that stores the received data. 24. The storage medium according to claim 21, wherein the logical channel identification step is executed by a microprocessor that inputs the received data. 25. A storage medium characterized by storing in a form of a readable program, performing image formation based on received data based on the steps according to claim 21. 26. As a data processing method for performing data communication of multiple logical channels, a data receiving step of receiving data transferred from the outside, and a logical channel of received data is identified from the data received in the data receiving step. A logical channel identification step, and a buffer selection step of selecting buffer means for storing the data received in the data reception step for each logical channel according to the identification result of the logical channel identification step;
And a reception data writing step of writing data other than the data used for the logical channel identification in the logical channel identification step in the selected buffer means in the form of a readable program. Medium. 27. The storage medium according to claim 26, wherein said data receiving step uses a memory capable of storing at least received data sufficient to specify a logical channel in said logical channel identification step. Storage media. 28. As a data processing method having a data communication function of multiple logical channels, a step of receiving data transferred from the outside and inputting the received data to a microprocessor to identify a logical channel of the received data. And the step of selecting any one of a plurality of buffers based on the result of the identification, and the step of writing received data other than those used for the logical channel identification to the selected buffer. A storage medium stored in the form of a readable program. 29. The storage medium according to claim 28, wherein the step of receiving the data uses a memory capable of storing received data enough to specify a logical channel at least in the step of identifying the logical channel. A storage medium characterized by the above-mentioned. 30. A storage medium characterized by storing in a form of a readable program, performing image formation based on received data based on the steps according to claim 26. 31. The storage medium according to claim 21, wherein the storage medium includes a floppy (registered trademark) disk, a hard disk, and a storage medium that stores a program that can be read by a server computer and a client computer. Magneto-optical disk, optical disk, CD-ROM,
CD-R, magnetic tape, nonvolatile memory card, RO
A storage medium using M. 32. The storage medium according to claim 21, wherein said storage medium is detachable from a server computer and a client computer. 33. A program for causing a computer to execute a data processing procedure for performing data communication of multiple logical channels, the program comprising: a logical channel identifying step of identifying a logical channel of data received from outside; A storage step of storing, for each logical channel, data other than the data used for identifying the logical channel among the received data, based on an identification result obtained by the identifying step. 34. A program for causing a computer to execute a data processing procedure for performing data communication of a multiplex logical channel, the program comprising: a data receiving step of receiving data transferred from the outside; A logical channel identification step for identifying a logical channel of the received data from the received data; and a buffer for selecting buffer means for storing the data received in the data receiving step for each logical channel based on the identification result of the logical channel identification step. A program comprising: a selection step; and a reception data writing step of writing data other than the data used for logical channel identification in the logical channel identification step in the selected buffer means. 35. A program for causing a computer to execute a data processing procedure having a data communication function of a multiple logical channel, the program comprising: a step of receiving data transferred from outside; And identifying a logical channel of the received data; selecting one of a plurality of buffers based on a result of the identification; and identifying the logical channel with respect to the selected buffer. And writing received data other than the used data.