JPS6068763A - Picture information controller - Google Patents

Abstract

PURPOSE:To attain retransmission processing even if a transmission error occurs by providing a memory capable of storing at least one page's share of picture information, and transmitting the information to an input/output device after the picture is stored once to the said memory. CONSTITUTION:When a connection command to establish a transmission line is outputted from a central processing uint 10, the connection command is outputted from a picture information controller 20 to a picture information input/ output device 30 so as to establish the transmission line. Then a data representing the attribute of picture information is transmitted from the central processing unit 10 and attribute information is exchanged with the information input/ output device 30. The picture information is transmitted from the central processing unit 10 succeedingly, the picture information is stored in a page memory A of a picture information memory circuit at first, the information is read under the control of a main control circuit 22 and transmitted to the input/output device 30. If the picture information of a page is not received normally, the notice is fed from the main controller 22 to the picture information memory circuit 21, where retransmission processing is conducted.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to an image information control device having a function of relaying image information from a central processing unit to an image information input/output device. It's about trying to do well.

Prior Art and Problems As shown in Fig. 1, a central processing unit 10 such as a boss I-CP LJ is sent to an image information input/output device 30 such as a facsimile (FAX) via a dual information system β11 device 20. A system for transmitting image information is being considered.

This image information control device 20 looks like a modem from the central processing unit 10, and looks like a similar facsimile (sending side FAX) from the image information input/output device 30. The image information control device 20 is a computer/facsimile connection device (
CF'C), and the device 20 and the image information input/output device 3
0 is connected via a telephone line or the like.

In such a system, the central processing unit 10 gives image information (compressed data for one page) to the control device 20, and the control device 20 sends this to the input/output device 30, and when the sending is completed, the next image information is sent. The input/output device 30 receives the information from the central processing unit.
This process is repeated to transmit all the image information of a predetermined number of pages to the input/output device 30. If there is an error in the image information received by the input/output device 30 during data transmission, the central processing unit 10 performs retransmission processing on a page-by-page basis. But 1
Even if the image information for one page is compressed, there is a considerable amount of image information, and if the central processing unit retransmits this information, the load on the central processing unit increases considerably.

OBJECTS OF THE INVENTION The present invention attempts to reduce the load on a central processing unit by providing an image information control device with a buffer memory for image information and performing retransmission processing.

Structure of the Invention The present invention provides an image information control device installed between a central processing unit and an image information input/output device, which includes a memory capable of storing image information for at least one page. The image information to be transmitted from the image information input/output device to the image information input/output device is stored in the memory, and if a transmission error occurs between the image information control device and the image information input/output device, the image information control device stores the image information in the memory. It is characterized in that the corresponding image information is read out from the image information input/output device and retransmitted to the image information input/output device, and this will be explained in detail with reference to the illustrated embodiment.

Embodiment of the Invention Figure 2 is a detailed block diagram of the control device 20, in which 21 is a newly installed image information memory circuit, and 22 is a main control circuit that controls the entire system. 23 is an interface circuit for the image information input/output device ζ (0, and 24 is an interface circuit for the central processing unit 1o. In this example, Image information memory circuit 2
1 has memories A and B for two pages, but this may be for one page or three or more pages.

FIG. 3 shows the overall control procedure when the image information control device 20 having the configuration of FIG. 2 is applied to the system of FIG. 1. ■, ■, ■, etc. indicate the order, which will be explained in order below. ■The central processing unit 10 is connected to establish a transmission path between the device and the image information input/output device 30. Indicates a directive.

■Image information control device 2 is connected by a connection command from the central processing unit.
A connection command is issued from 0 to the image information input/output device 3o, and a transmission path is established.

(2) Prior to transmitting the image information, the central processing unit 10 transmits data indicating attributes of the image information (size of one page, communication speed, etc.).

(2) The attribute information transmitted from the central processing unit 10 and the attribute information of the image information input/output device 30 are exchanged, and an image information transmission method is determined.

■After the attribute data has been exchanged, the image information for the first page (compressed data of 40 to 100 Kbytes) is sent from the central processing unit 1o.
is sent.

(2) The image information transmitted from the central processing unit is stored in page memory 8 of the image information memory circuit 21 shown in FIG.

(2) Read the first page of image information received from the central processing unit from the page memory A and transmit it to the image information input/output device 30.

■At the same time, from the image information control device 20 to the central processing unit lO
Issues a request to send the next image information to.

(2) As a result, the image information of the second page is transmitted from the central processing unit 10.

[Phase] When reception is performed normally, the image information input/output device 30
Is the image 1 of the first page transmitted from the image information control device 2o? # Notify that the message was successfully received.

(1) Central processing unit (2) Image information transmitted from 0 is stored in page memory B of the image information memory circuit 21 shown in FIG.

@Image information i1i The control device 20 reads the second page of the image information received from the central processing unit 10 from the page memory B, and transmits it to the image information input/output device 30.

The 0-image information control device 20 also issues a request to the central processing unit 10 to transmit the next image information.

■Assuming that the second page is not received normally, the image information input/output device w30 and the image information Mil control device 20
A (abnormality) notification is issued to the effect that the image information of the second page sent from the server could not be received correctly.

[Phase] During this period as well, the image information of the third page is transmitted from the central processing unit IO, and this image information is stored in the page memory A in the same way as in step (2).

[Phase] When an abnormality notification is received, the image information control device 20 enters a retransmission process, reads out the second page of image information from the page memory B of the image information memory circuit, and resends it to the image information input/output device 30.

Assuming that this transmitted portion has been received normally, the image information input/output device 30 issues a notification that the image information of the second page has been received normally. The same applies below.

[Phase] If the image information to be transmitted ends after three pages, the central processing unit 10 issues an image information transmission completion notification upon completion of the image information transmission for the third page.

[Phase] Upon receiving this, the image information control device 20 issues an image information transmission end notification to the image information input/output device 30 after completing the transmission of the third page of image information.

[Phase] Next, the central processing unit 10 issues a command to disconnect the transmission path between the device and the image information input/output device 30.

(2) Upon receiving this, the image information control device 20 issues a disconnection command to the image information input/output device 30, and the transmission path is disconnected.

Effects of the Invention As described above, according to the present invention, if a transmission error occurs while transmitting image information from the image information control device to the image information input/output device, the image information control device performs retransmission processing, so that central processing is not required. This has the advantage of reducing the load on the device.

[Brief explanation of the drawing]

1 is a schematic block diagram of a system using the image information control device, FIG. 2 is a block diagram showing an embodiment of the present invention, and FIG. 3 is an explanatory diagram showing its control procedure. In the figure, 1 is a central processing unit, 2 is an image information control device, 3 is an image information input/output device, and 21 is an image information memo 11 circuit. Applicant Fujitsu Stock Representative Company Representative Patent Attorney Aoyagi 4♂

Claims (1)

[Claims] An image information control device installed between a central processing unit and an image information input/output device, which is equipped with a memory capable of storing image information for at least one page, and has a memory that can store image information for at least one page; Image information to be transmitted to is stored in the memory, and when a transmission error occurs between the image information control device and the image information input/output device, the image information control device reads the corresponding image information from the memory. An image information control device characterized in that the image information is retransmitted to an image information input/output device.