JP5381476B2 - Facsimile communication device and serial signal transmission line assignment program - Google Patents

Description

The present invention is, off Akushimiri communication device, and a serial signal transmission line allocation program.

  Patent Document 1 proposes a distributed arbitration of serial bus usage rights, and a bus usage right request unit is used for the purpose of digesting messages without bias in the entire system in a station where message transmission is permitted within the shared time zone. However, based on the current situation of the own station, the priority data of the own station is dynamically created, and a bus use right request to which the dynamic priority data is added is transmitted by broadcast, and the priority data storage unit However, the priority data storage of the local station and the other station that transmitted the bus use right request is stored, and the arbitration unit arbitrates the bus use right based on the priority data stored in the priority data storage unit. It is disclosed.

JP 2006-148815 A

The present invention provides communication control and operation when communication control for transmitting and receiving communication procedure information and operation control for storing and reading image information in a storage medium are executed by a common serial signal transmission line (serial bus). without affect each other in the control, full Akushimiri communication device that can be prevented from reaching the error handling processing including communication interruption, and it is an object to obtain a serial signal transmission line allocation program.

The invention according to claim 1 transmits / receives procedure information necessary for communication between the local station and the partner station using a facsimile modem via the serial signal transmission line and the serial transmission signal line, and Communication control means for transmitting and receiving image information between the local station and the partner station, and an operation for controlling an operation for storing image information in a storage medium or a reading operation for reading from the storage medium via the serial transmission signal line Control means, assignment means for assigning the serial transmission signal line to the communication control means or the operation control means in time series, transmission / reception of procedure information for ensuring the communication by the facsimile modem in the communication control means, and the requisite period between the reception of the image information, so as to store or period to perform reading of image information by the operation control means, varying the allocation destination of the allocation means It has determination means for determining when the.

According to the second aspect of the present invention, the serial signal transmission line and the procedure information necessary for communication between the local station and the partner station using a facsimile modem via the serial transmission signal line are transmitted and received. Communication control means for transmitting and receiving image information between a station and a partner station, and operation control for controlling an operation for storing image information in a storage medium or a reading operation for reading from the storage medium via the serial transmission signal line means and said serial signal transmission line, when said allocation means for allocating the communication control means or said operation control means sequence, the reception of transmission and reception between the image information of the procedure information by facsimile modem in the communication control unit essential during the 75ms timer period, so that the period for executing the storing or reading of the image information by the operation control means, determine the timing of changing the allocation destination by said allocation means Has determination means for the.

According to a third aspect of the present invention, there is provided a serial signal transmission line, and through the serial transmission signal line, procedure information necessary for communication between the local station and the partner station using a facsimile modem is transmitted and received. Communication control means for transmitting and receiving image information between a station and a partner station, and operation control for controlling an operation for storing image information in a storage medium or a reading operation for reading from the storage medium via the serial transmission signal line Means, temporary storage means for temporarily storing image information for a plurality of pages on the basis of output paper, and image information to be transmitted and received between the local station and the partner station, and the serial transmission signal line. image information for transmitted and received at a station and the other station, the to the storage medium from the temporary storage unit, or the image information transfer control means for transferring from the storage medium said to the temporary storage means, the serial transmission signal line ,Time series And assigning means for assigning to said communication control means or said operation control means, between the pages of the image information transmitted and received by the facsimile modem in the communication control unit, a period for executing the transfer of image information by the image information transfer control means As described above, there is a determination means for determining a change timing of the assignment destination by the assignment means.

According to a fourth aspect of the present invention, in the invention of the third aspect , a non-use period of the serial signal transmission line is forcibly generated between the pages by the communication control means for a predetermined period. It further has a use period setting means.

According to a fifth aspect of the present invention, in the invention of the fourth aspect , the non-use period setting means is configured such that when the communication control means transmits image information from the local station to the counterpart station, The period until the message confirmation command MCF is received again from the other station, which is executed by ignoring the received message confirmation command MCF, is defined as the non-use period.

According to a sixth aspect of the present invention, in the invention of the fourth aspect , the non-use period setting means is configured such that when the communication control means receives image information from the partner station to the own station and when communication fails. When the function for resending the command is activated, after receiving the image information for one page, the predetermined period is set by transmitting the reception disabled command RNR with a delay for a predetermined period. The message confirmation command MCF is determined in advance when the communication control means is in a non-use period, and when the communication control means receives image information from the partner station to its own station, and when the function for resending the command when communication fails is not activated. By stopping the period transmission, the predetermined period is set as the non-use period.

According to a seventh aspect of the present invention, in the invention according to any one of the fourth to sixth aspects, in the transfer of the image information between the temporary storage means and the storage medium, a predetermined amount of image information Is not transferred, the allocating unit allocates the serial transmission signal line to the communication control unit, and transmits a command for waiting the partner station to the partner station.

The invention according to claim 8 transmits / receives procedure information necessary for communication between the local station and the partner station using a facsimile modem via the serial transmission signal line, and the local station and the partner station transmit an image. A communication control means for transmitting and receiving information; an operation control means for controlling an operation for storing image information in a storage medium or a read operation for reading from the storage medium via the serial transmission signal line ; Image information to be transmitted / received to / from the partner station is temporarily transmitted / received between the own station and the partner station via the serial transmission signal line and temporary storage means for temporarily storing the amount of image information for a plurality of pages with reference to the output paper Image information transfer control means for transferring image information to be transmitted from the temporary storage means to the storage medium or from the storage medium to the temporary storage means, and the serial transmission signal line in time series, the communication control means Or And assigning means for assigning the serial operation control means, between the pages of the image information transmitted and received by the facsimile modem in the communication control unit, so that the period for executing the transfer of image information by the image information transfer control means, said A serial signal transmission line allocation program for causing a computer to execute a function including a determination unit that determines a change timing of an allocation destination by an allocation unit.

According to the first aspect of the present invention, an indispensable period is set between the transmission / reception of the command and the transmission / reception of the image information for ensuring the communication of the facsimile modem in the communication control unit. Compared with the case where the period for executing the reading is not set, the communication control and the operation control do not affect each other, and the serial signal transmission line can be shared under the existing hardware configuration.

According to the second aspect of the present invention, a 75 ms timer period is essential between the transmission / reception of the procedure information and the transmission / reception of the image information by the communication control unit of the facsimile modem in the communication control unit. Compared to the case where the period for storing or reading information is not set, it is possible to share the serial signal transmission line under the existing hardware configuration without affecting each other of the communication control and the operation control.

According to the third and eighth aspects of the present invention, the interval between the pages of the image information transmitted / received by the facsimile modem in the communication control means is not a period for executing the image information transfer by the image information transfer control means. As compared with the above, the serial signal transmission line can be shared under the existing hardware configuration without affecting each of the communication control and the operation control.

According to the invention described in claim 4 , each of the communication control and the operation control is mutually compared with the case where the non-use period of the serial signal transmission line by the communication control means forcibly determined in advance is not generated. The serial signal transmission line can be shared without any influence and under the existing hardware configuration.

According to the invention described in claims 5 to 7 , the non-use period can be easily generated as compared with the case where the present configuration is not provided.

It is a control block diagram of the image processing apparatus according to the present embodiment. It is a schematic block diagram which shows the control system of the multifunction control part which concerns on this Embodiment. It is a communication protocol diagram by the facsimile modem which concerns on this Embodiment. The flow of control for securing the right to use the data signal line (DO) 44 and the data signal line (DI) 46 of the storage medium access device 34 based on “Necessary non-use period 1” according to the present embodiment is shown. It is a flowchart. It is a flowchart which shows the flow of control for ensuring the use right of the serial bus of a storage-medium access device based on "Necessary non-use period 2" concerning this Embodiment. It is a flowchart which shows the flow of control for securing the use right of the serial bus of a storage-medium access apparatus based on the "forced non-use period" concerning this Embodiment. FIG. 10 is a communication protocol diagram in which an extension measure is taken when there is an ECM. It is a block diagram which shows the specific example which shows the difference in the data transfer time based on a buffer increase.

  FIG. 1 shows a control block diagram of the image processing apparatus 10 in the present embodiment.

  The image processing apparatus 10 is a so-called multi-function machine and has a configuration having a facsimile function, a scanner function, and a printer function.

  The scanner module unit 12 and the printer module unit 14 are connected to each other by a bus 16, and a control panel 18 is connected to the bus 16.

  The bus 16 is connected to a multifunction device control unit (hereinafter referred to as “multifunction control unit 22”) via the interface 20. The multi-function control unit 22 controls the scanner module unit 12 and the printer module unit 14.

  Here, the multifunction control unit 22 of the present embodiment is provided with a facsimile modem 24.

  The multifunction control unit 22 includes a CPU 26, a RAM 28, and a ROM 30, which are connected to each other by a bus 32.

  The CPU 26 is connected to the facsimile modem 24 and a storage medium access device 34 for storing and reading image information for transmission / reception with a partner station under the communication function of the facsimile modem 24.

  For this connection, a serial bus (PCI) 36 (corresponding to each or both of a data signal line (DO) 44 and a data signal line (DI) 46 (see FIG. 2) which will be described later) is applied, and a facsimile is used. The modem 24 and the recording medium access device 34 are connected to the CPU 26 by a common data signal line (DO) 44 and data signal line (DI) 46.

  In the present embodiment, an SD card (not shown) is applied as a storage medium and is loaded in the storage medium access device 34. Note that the storage medium is not limited to an SD card, but is an MS (Memory Stick), CF (Compact Flash), MD (Mini Disk), SM (Smart Media (registered trademark)), or other so-called multimedia cards. Alternatively, it can be applied to an EEPROM (Electrically Erasable Programmable Read Only Memory) capable of serial communication, a serial RAM (Random Access Memory), or the like.

  FIG. 2 is a detailed diagram of the hardware configuration of the multi-function control unit 22 mainly composed of facsimile communication by the facsimile modem 24.

  The RAM 28 connected to the CPU 26 by the bus 32 functions as a temporary storage unit in the present embodiment.

  The CPU 26 and the facsimile modem 24 are connected by four signal lines: a clock signal line 40, a chip select signal line 42, a data signal line (DO) 44, and a data signal line (DI) 46.

  The CPU 26 and the storage medium access device 34 are connected by four signal lines: a clock signal line 48, a chip select signal line 50, a data signal line (DO) 44, and a data signal line (DI) 46. The data signal line (DO) 44 and the data signal line (DI) 46 are shared by being branched and connected to the facsimile modem 24 and the storage medium access device 34. Each of the data signal line (DO) 44 and the data signal line (DI) 46 has a serial transmission method in which data is transmitted in series by one bit at a time.

  Here, the facsimile modem 24 executes a predetermined communication protocol (procedure control for communication) as a preparation for transmitting and receiving image information between the local station and the partner station, and during execution of the communication protocol. , Send and receive image information.

  On the other hand, the storage medium access device 34 executes a process of storing image information as a facsimile document when it is received and reading it when transmitting it.

  These elements are executed at the same time, and it is necessary to establish arbitration (assignment of usage rights) of the shared data signal line (DO) 44 and data signal line (DI) 46.

  However, the difference from normal arbitration is that, particularly, in the facsimile modem 24, a communication error may occur if there is no command from the partner station during a predetermined period during execution of the communication protocol. More specifically, if the data signal line (DO) 44 and the data signal line (DI) 46 are opened (not used) during transmission / reception (PIX) of image information by the facsimile modem 24 or between communication protocol commands. If the right to use the data signal line (DO) 44 and the data signal line (DI) 46 is not returned to the facsimile modem 24 within 5 ms, a communication error occurs and real-time communication cannot be established.

  Also in the storage medium access device 34, if the right to use the serial bus 24 is interrupted while image information is being stored and image information is being read (hereinafter collectively referred to as “image information access”), the image information can be accessed accurately. It may disappear.

  Therefore, in the present embodiment, at least during the non-use period of the data signal line (DO) 44 and the data signal line (DI) 46 that are necessarily present in the facsimile modem 24, the right to use the storage medium access device 34 is granted. To give.

(Necessary period of non-use 1)
An open (non-use) period of the data signal line (DO) 44 and the data signal line (DI) 46 generated during the transmission / reception (PIX) of the image information by the facsimile modem 24 or between communication protocol commands, The usage right period of the storage medium access device 34 is assumed. This period is 5 ms. On the storage medium access device 34 side, assuming that the amount of image information is 64 KB, a communication speed of 64 KB / 5 ms = 104.4 Mbps is required. This is extremely high speed compared to the normal communication speed (around 10 Mbps), but is in the range of application in view of the future clock speed.

(Necessary period of non-use 2)
A 75 ms timer is started between transmission / reception of a command for ensuring communication and transmission / reception of image information (PIX) in the communication protocol. In other words, transmission / reception on the communication protocol is not executed for 75 ms.

  This period is shown in FIG. 3 between (A) image information transmission / reception PIX-match page command MPS, (B) transmission terminal identification / digital command command TSI / DCS-training check command TCF, and (C). This corresponds to between the reception preparation confirmation CFR and the image information transmission / reception PIX. The training check command TCF is handled in the same way as PIX because image information is embedded.

  3A, 3B, and 3C, the 75 ms timer is started. At this time, the data signal line (DO) 44 and the data signal line are connected to the storage medium access device 34. The right to use (DI) 46 is given.

This 75ms, in order to transmit image information amount (64KB), relative to 5ms in the inevitably non-use period 1, because it requires a rate of 1/15 (= 75/5 ) (6.83Mbps), Special A communication device or the like is unnecessary.

  In the present embodiment, in addition to the inevitable period of the data signal line (DO) 44 and the data signal line (DI) 46 that exist inevitably, it is forcibly not used within a range where no communication error occurs. A period is set, and the storage medium access device 34 is given a right to use the forcibly generated non-use period.

(Forced non-use period)
The RAM 28 used as the temporary storage device has a storage area for temporarily storing image information for two pages of the facsimile document size.

  This image information amount is 9 MB when the document size is JIS standard and A3 size, and 4.5 MB when the document size is A4 size.

  Here, on the assumption that transmission / reception by the facsimile modem 24 extends over two pages, image information is transferred between the pages by the RAM 28 and the storage medium access device 34.

  In order to realize the above, in the communication protocol, a command is waited or repeated transmission is requested so that communication is not interrupted.

  More specifically, the target communication protocol command differs between when the facsimile modem 24 transmits and when it receives.

  When the facsimile modem 24 is transmitting, the message confirmation command MCF received from the partner station is ignored once. Due to this ignorance, the partner station retransmits the message confirmation command MCF.

  As a result, a time of about 1 second is secured until the local station re-receives the message confirmation command MCF. During this period, the right to use the data signal line (DO) 44 and the data signal line (DI) 46 is given to the storage medium access device 34.

When receiving by the facsimile modem 24, it depends on whether or not there is a function ECM to be retransmitted when an error occurs.
(With ECM)
After receiving the image information for one page, the message confirmation command MCF for the next page is originally transmitted, but the unreceivable command RNR is transmitted 1.5 seconds later.

  In this case, since a receivable command RR is returned from the partner station, the receivable command RNR is transmitted 1.5 seconds later after a limit of 1 minute from the first receivable command RNR.

The one minute limit is because the communication is cut off if the message confirmation command MCF is not transmitted within one minute from the first reception disabled command RNR. In other words, the right to use the data signal line (DO) 44 and the data signal line (DI) 46 of the storage medium access device 34 for 1 minute is secured.
(Without ECM)
Transmission of the message confirmation command MCF is stopped for 1 to 1.5 seconds. Basically, if communication is interrupted for 1.5 seconds or more, communication may be interrupted. By stopping the transmission, the right to use the data signal line (DO) 44 and the data signal line (DI) 46 of the storage medium access device 34 is secured for a period of 1 to 1.5 seconds.

  In the following, according to the flowcharts of FIGS. 4 to 6, the control for granting the right to use the data signal line (DO) 44 and the data signal line (DI) 46 of the storage medium access device 34 is performed. It demonstrates according to form.

(Inevitable setting control for non-use period 1)
FIG. 4 is a flowchart showing a control flow for securing the right to use the data signal line (DO) 44 and the data signal line (DI) 46 of the storage medium access device 34 based on “Necessary non-use period 1”. is there.

In Step 100, the chip select signal CS of the facsimile modem 24 is set to Low (in this embodiment, Low → Active, High → Inactive ), and the control of the facsimile modem 24 by the CPU 26 is started, and the process proceeds to Step 102. . In step 102, facsimile communication is started.

In the next step 104, it is determined whether or not the chip select signal CS of the facsimile modem 24 is low, and is maintained (during facsimile communication) while an affirmative determination is made. If a negative determination is made in this step 104, that is, if the chip select signal CS becomes High, the process proceeds to Step 106, and the chip select signal CS of the storage medium access device 34 is changed to Low (in this embodiment, Low → Active, High). → inactive ), and control of the storage medium access device 34 by the CPU 26 is started. This is about 5 ms.

  In the next step 108, it is determined whether or not the access to the storage medium access device 34 has been completed. If an affirmative determination is made, the process proceeds to step 110 where the chip select signal CS of the storage medium access device 34 is set to High. The chip select signal CS of the facsimile modem 24 is set to Low, the control of the facsimile modem 24 by the CPU 26 is started (restarted), and this routine ends.

(Inevitable setting control for non-use period 2)
FIG. 5 is a flowchart showing a flow of control for securing the right to use the data signal line (DO) 44 and the data signal line (DI) 46 of the storage medium access device 34 based on “Necessary non-use period 2”. is there. At present, securing the right to use the data signal line (DO) 44 and the data signal line (DI) 46 of the storage medium access device 34 during this 75 ms timer period is an effective means.

In step 120, the chip select signal CS of the facsimile modem 24 is set to Low (in this embodiment, Low → active, High → inactive ), and the control of the facsimile modem 24 by the CPU 26 is started, and the process proceeds to step 122. . In step 122, facsimile communication is started.

  In the next step 124, it is determined whether or not the signal of the facsimile modem 24 is between the image information PIX and the command (see (A), (B), and (C) of FIG. 3).

  When an affirmative determination is made at step 124, the routine proceeds to step 126, where it is determined whether or not the chip select signal CS of the facsimile modem 24 is low. Normally, the chip select signal CS should be low between the image information PIX and the command, but it is determined for confirmation.

In this step 126, it is maintained (during the facsimile communication) while an affirmative determination is made. If a negative determination is made in this step 126, that is, if the chip select signal CS becomes High, the process proceeds to Step 128, and the chip select signal CS of the storage medium access device 34 is changed to Low (in this embodiment, Low → Active, High). → inactive ) and control of the storage medium access device 34 by the CPU 26 is started.

  In the next step 130, it is determined whether or not 75 ms has elapsed from the beginning of the signal switching between the image information PIX and the command. This period is a period in which the 75 ms timer is activated, and the right to use the data signal line (DO) 44 and the data signal line (DI) 46 is given to the storage medium access device 34 in synchronization with this period. Count period.

  When an affirmative determination is made at step 130, that is, when the 75 ms timer expires, the routine proceeds to step 132 where the chip select signal CS of the storage medium access device 34 is set to High and the chip select signal CS of the facsimile modem 24 is set to Low. The control of the facsimile modem 24 is started (restarted), and this routine ends.

(Forced inevitable non-use period setting control)
FIG. 6 is a flowchart showing a flow of control for securing the right to use the data signal line (DO) 44 and the data signal line (DI) 46 of the storage medium access device 34 based on the “forced non-use period”. .

  In step 150, the transmission image information is temporarily stored in the RAM 28 for transmission by the facsimile modem 24. At this time, image information for two pages is stored.

In the next step 152, the chip select signal CS of the facsimile modem 24 is set to Low (in this embodiment, Low → active, High → inactive ), and the control of the facsimile modem 24 by the CPU 26 is started. Transition. In step 154, facsimile communication is started.

  In the next step 156, upon reception by the facsimile modem 24, the received image information is temporarily stored in the RAM 28.

  In the next step 158, it is determined whether or not the signal of the facsimile modem 24 represents between pages. If the determination is negative, facsimile communication is maintained. If an affirmative determination is made in step 158, that is, it is determined that there is a page interval, the process proceeds to step 160, the chip select signal CS of the facsimile modem 24 is set to High, and the process proceeds to step 162.

In step 162, the chip select signal CS of the storage medium access device 34 is set to Low (in this embodiment, Low → active, High → inactive ), and the CPU 26 starts control of the storage medium access device 34.

  At this time, in step 162, at the time of transmission, the next page is read from the SD card attached to the storage medium access device 34 and transferred to the RAM 28. At the time of reception, the received image information (for one page) is transferred from the RAM 28 to the SD card attached to the storage medium access device 34.

  In the next step 164, it is determined whether 1000 ms (1 second) has elapsed since the signal switching of the facsimile modem 24. For example, an interruption of 1.5 seconds or more may result in a communication interruption, and when a period before (here, 1 second) elapses, a data signal line (DO) 44 to the storage medium access device 34, The right to use the data signal line (DI) 46 is removed, and the right to use the data signal line (DO) 44 and the data signal line (DI) 46 is transferred to the facsimile modem 24.

  In the next step 166, the chip select signal CS of the storage medium access device 34 is set to High, the chip select signal CS of the facsimile modem 24 is set to Low, and the control of the facsimile modem 24 by the CPU 26 is started (restarted), and this routine ends. To do.

  As a reference, Table 1 shows commands used for the communication protocol in the facsimile modem 24. The command in Table 1 is an example.

  By the way, in FIG. 6, since the storage medium access device 34 obtains the right to use the data signal line (DO) 44 and the data signal line (DI) 46 for 1 second (1000 ms) between pages, However, in the case of a photographic image or the like, the amount of image information may be larger than that of a character image.

  Therefore, the communication protocol between pages is extended by operating the communication procedure within a range where communication is not interrupted.

  FIG. 7 shows a communication protocol in which an extension measure is taken when there is an ECM (a function to retransmit when an error occurs).

  After receiving the image information for one page, the unreceivable command RNR is transmitted 1.5 seconds later. As a result, a use right securing period of 1.5 seconds is obtained.

  A receivable command RR is returned from the partner station that has received the receivable command RNR. At this time, the unreceivable command RNR is transmitted again after 1.5 seconds.

  Here, if the message confirmation command MCF is not transmitted within one minute from the first unreceivable command RNR, the communication is cut off, and thus the repetition is limited to this one minute.

  If there is no ECM, transmission of the message confirmation command MCF may be stopped for 1 to 1.5 seconds.

  In this embodiment, the buffer of the facsimile modem 24 is set to normal 16 bytes. However, the buffer may be enlarged to 256 bytes by using an extra buffer.

  The overhead is reduced by increasing the number of transmission data at one time and reducing the number of accesses and interruptions of the facsimile modem 24. In this case, it is not necessary to make the timer accuracy finer than when the number of buffers is not increased, and versatility is enhanced.

  FIG. 8 shows a specific example showing the difference in data transfer time based on this buffer increase.

First, the performance at the time of the default buffer (16 bytes) is calculated.
・ The interrupt frequency is 1 ms timer interrupt (every 1 ms during transmission).
-The delay tolerance may cause the FIFO to empty with a delay of 2 ms to 4 ms.
・ The data transfer time of the serial bus is assumed to operate at 20.833 MHz as a precondition (0.048 us / bit = 0.384 us / Byte).
・ Write 8 bytes to the buffer every 1 ms.
・ The data transfer time of the serial bus is about 50 μsec (during 8-byte data transfer).

  Under the above conditions, the communication time is calculated below.

  To write 1 byte to the buffer, it is necessary to read and write a total of 4 bytes including status reading and commands.

  Further, the overhead amount is four times as long as the communication time from the FAXMINI measurement. Therefore, if 4 bytes are transmitted to the facsimile modem 24 via the serial bus every 1 ms, the data transfer time is (0.384 μs × 4 × 4 × 4 × 8 =) 49.152 μs (about 100 μs when MAX16 bytes are transmitted).

Next, the performance is calculated when the extended buffer threshold is 64 bytes in the transmission extended buffer 128 bytes (default).
-As for the interrupt frequency, an interrupt occurs when the expansion buffer becomes 64 bytes or less (about 16 ms in 33.6 Kbps communication).
-With interrupt delay tolerance, even if interrupt processing is delayed, the FIFO will not be emptied if processing is completed within 16 ms.
・ As for the data transfer time of the serial bus, it is assumed that the serial bus operates at 20.833 MHz as a precondition (0.048 μs / bit = 0.384 μs / Byte).
• The buffer is written with 64 bytes in one interrupt. • The serial bus data transfer time is about 400 μsec (when transferring 64 bytes of data).

  The communication time is calculated below under the above conditions.

  To write 1 byte to the buffer, it is necessary to read and write a total of 4 bytes including status reading and commands.

  Further, the overhead amount is four times as long as the communication time from the FAXMINI measurement. Therefore, when 64 bytes are transmitted to the facsimile modem 24 via the serial bus, the data transfer time is (0.384 μs × 64 × 4 × 4 =) 393.2 μs.

  In this embodiment, a facsimile modem is taken as an example of the communication control means. However, in the communication between computers, a CCU that controls transmission and reception of data between a computer and a communication line such as the Internet or a LAN (Local Area Network). (Communication Control Unit) may be used.

DESCRIPTION OF SYMBOLS 10 Image processing apparatus 12 Scanner module part 14 Printer module part 16 Bus 18 Control panel 20 Interface 22 Multifunction control part 24 Facsimile modem 26 CPU
28 RAM
30 ROM
32 bus 34 storage medium access device 40 clock signal line 42 chip select signal line 44 data signal line (DO)
46 Data signal line (DI)

Claims (8)

A serial signal transmission line;
Communication for transmitting / receiving procedure information necessary for communication between the local station and the partner station using a facsimile modem via the serial transmission signal line, and for transmitting / receiving image information between the local station and the partner station. Control means;
Operation control means for controlling an operation for storing image information in a storage medium or a reading operation for reading out from the storage medium via the serial transmission signal line;
Assigning means for assigning the serial transmission signal line to the communication control means or the operation control means in time series;
An indispensable period between the transmission / reception of the procedure information and the transmission / reception of the image information for ensuring the communication by the facsimile modem in the communication control means, and a period for executing the storage or reading of the image information by the operation control means as to the determining means for determining a timing of changing the allocation destination by said allocation means,
A facsimile communication apparatus. A serial signal transmission line;
Communication for transmitting / receiving procedure information necessary for communication between the local station and the partner station using a facsimile modem via the serial transmission signal line, and for transmitting / receiving image information between the local station and the partner station. Control means;
Operation control means for controlling an operation for storing image information in a storage medium or a reading operation for reading out from the storage medium via the serial transmission signal line;
Assigning means for assigning the serial transmission signal line to the communication control means or the operation control means in time series;
The 75 ms timer period, which is essential between the transmission / reception of the procedure information by the facsimile modem in the communication control means and the transmission / reception of the image information, is set as a period for storing or reading the image information by the operation control means. Determining means for determining when to change the assignment destination by the assigning means;
A facsimile communication apparatus. A serial signal transmission line;
Communication control for transmitting and receiving procedure information necessary for communication between the local station and the partner station using a facsimile modem and transmitting and receiving image information between the local station and the partner station via the serial transmission signal line Means,
Operation control means for controlling an operation for storing image information in a storage medium or a reading operation for reading out from the storage medium via the serial transmission signal line;
Temporary storage means for temporarily storing image information for transmitting and receiving between the local station and the partner station, the amount of image information for a plurality of pages on the basis of output paper;
Image information transfer control for transferring image information for transmission and reception between the local station and the partner station via the serial transmission signal line from the temporary storage means to the storage medium or from the storage medium to the temporary storage means. Means,
Assigning means for assigning the serial transmission signal line to the communication control means or the operation control means in time series;
An allocation destination change time is determined by the allocating unit so that the interval between the pages of the image information transmitted and received by the facsimile modem in the communication control unit is a period for executing the image information transfer by the image information transfer control unit. A decision means to
A facsimile communication apparatus. Between the pages, the facsimile communication apparatus according to claim 3, further comprising forcibly further non-use period setting means for generating a non-use period of the serial signal transmission line by the communication control means of the predetermined period. The non-use period setting means is
When the communication control means transmits image information from its own station to the other station, it re-receives the message confirmation command MCF from the other station, which is executed by ignoring the message confirmation command MCF received from the other station. 4. The facsimile communication apparatus according to claim 3 , wherein a period up to is the non-use period. The non-use period setting means is
When the communication control means is receiving image information from the other station to its own station , and when the function of resending a command when communication fails is activated, it is determined in advance after receiving one page of image information. By transmitting the non-receivable command RNR after a predetermined period, the predetermined period is set as the non-use period,
When the communication control means is receiving image information from the partner station to its own station, and when the function of resending the command when communication fails is not activated, the transmission of the message confirmation command MCF is stopped for a predetermined period. 5. The facsimile communication apparatus according to claim 4 , wherein the predetermined period is the non-use period. In the transfer of image information between the temporary storage means and the storage medium, when the predetermined amount of image information has not been transferred , the assigning means assigns the serial transmission signal line to the communication control means, The facsimile communication apparatus according to any one of claims 4 to 6 , wherein a command for causing the station to wait for the other station is transmitted . Communication control means for transmitting and receiving procedure information necessary for communication between the local station and the partner station using a facsimile modem via the serial transmission signal line, and for transmitting and receiving image information between the local station and the partner station When,
Operation control means for controlling an operation for storing image information in a storage medium or a reading operation for reading out from the storage medium via the serial transmission signal line;
Temporary storage means for temporarily storing image information for transmitting and receiving between the local station and the partner station, the amount of image information for a plurality of pages on the basis of output paper;
Image information transfer control for transferring image information for transmission and reception between the local station and the partner station via the serial transmission signal line from the temporary storage means to the storage medium or from the storage medium to the temporary storage means. Means,
Assigning means for assigning the serial transmission signal line to the communication control means or the operation control means in time series;
An allocation destination change time is determined by the allocating unit so that the interval between the pages of the image information transmitted and received by the facsimile modem in the communication control unit is a period for executing the image information transfer by the image information transfer control unit. A decision means to
A serial signal transmission line assignment program for causing a computer to execute a function including: