JPS6345150B2 - - Google Patents

Description

[Detailed Description of the Invention] (1) Technical Field of the Invention The present invention relates to a data transfer system, and in particular, in order to reduce the amount of data transferred between the main control unit and the line support unit, when one line of data has a specific pattern, The present invention relates to a method of transferring information more efficiently than actually transferring data by issuing information from the main control section to the line corresponding section.

(2) Prior Art and Problems Conventionally, when transmitting data to and from a computer using a communication line, all data was transferred via a line buffer. Therefore, there was a drawback in that a large load was placed on the main control section and the line support section.

(3) Purpose of the Invention The purpose of the present invention is to eliminate the above-mentioned drawbacks and to perform efficient data transfer.

(4) Structure of the Invention This object includes a line adapter equipped with a line buffer that stores dot pattern data for at least one line, and a main controller that stores dot pattern data of a plurality of lines to be transferred. The system is configured such that the main control device sends out stored dot pattern data in response to a transfer request, and the line adapter transfers the sent dot pattern data for each line via a line buffer. In this case, if the dot pattern data of the line to be transferred is the same as the blank line and/or the previous line, the main control device transfers the information to the dot pattern data, which is different from the dot pattern data predetermined in each case. A small amount of command information is sent to the line adapter, and when the data of the line to be transferred is a blank line or is not the same as the previous line, the dot pattern data of the transfer line is sent to the line adapter. , the line adapter is
This is achieved by a data transfer method characterized in that, when the information sent from the main control device is the command information, data corresponding to the command is transferred.

(5) Embodiments of the invention Examples of the invention will be described below in detail with reference to the drawings.

FIG. 1 is an overall block diagram showing one embodiment of the present invention. In the figure, 11 is a CPU (central processing unit), 12 is a line control unit (main control unit of CCU),
13 is a line adapter, 14 is a modem unit (FCU) for communicating with the fax, 15 is a network control device, 1
6 is an exchange, 17 is a public communication line, 18 is a fax
It is.

FIG. 2 is a diagram showing details of a line adapter and a main control unit of a CCU showing an embodiment of the present invention. In the figure, 21 is a command register, 22 is a line buffer A, 23 is a line buffer B, 24 is an image buffer, and 25 is a data bus.

Now, the amount of data in the dot pattern of facsimile is overwhelmingly larger than that of general data communication.
For example, the amount of data for an A4 size document in G mode facsimile is 152 BYTE x 1152 ≒ 175K.
Become BYTE. Therefore, if all the information stored in the image buffer 24 is transferred to the adapter 13 as in the prior art, it will place a considerable load on the communication control device 12. Therefore, when a data request interrupt signal for image information is received from the adapter 13, a new command is sent to the command register 21 in the line adapter 13 used to control modem signals, etc. for line data with special information. Add and write by command instead of line data transfer.
With this method, information of one line (152 BYTE) of data can be reduced to one byte (command), and the load on the communication control device 12 can be reduced. Furthermore, looking at the characteristics of the transferred data, for example, when outputting text, the lines between the lines are all white. If it is a standard sentence, the white line is known in advance. Furthermore, if the output information is image data, there is a high possibility that two consecutive lines will have the same dot pattern, and if the image is enlarged several times in the vertical direction, the same dot pattern will continue. For example, WHL (white line): This line is all white information.

SAM (SAME DATA): This line is the same information as the previous line.

Create a command called Then, instead of transferring data when a data request interrupt occurs from the line adapter, if the above command applies,
After issuing the command, the line adapter 13 interprets the command and generates and prepares desired data. This method is applicable not only to communication control devices but also to other devices having similar data transfer methods.

(6) Effects of the Invention As explained above, according to the present invention, when a G standard facsimile is used as an output terminal, the amount of data is 152 bytes per line x 1152 lines. Output this in the form of a standard document. If characters are output in 16 lines and the spaces between lines are 8 lines, 384 out of 1152 lines will be white lines. Therefore, by notifying the data transfer of this line with a command, the amount of data transferred between the CCU and the line adapter can be reduced from 175KBYTE to 117KBYTE.
This can be reduced to approximately 2/3. Therefore, the load on the communication control device is reduced and the peak load is averaged when multiple lines are used.

The processor of the communication control device can perform low-level processing by reducing interrupt processing time.

It can support special fast mode processing (for example, white line skipping) of facsimile terminals.

Providing a command indicating that the information is the same as before makes it easier to enlarge the image in the vertical direction.

There is an effect.

[Brief explanation of the drawing]

FIG. 1 is an overall block diagram showing one embodiment of the present invention. FIG. 2 is a diagram showing details of a line adapter and a main control unit of a CCU showing an embodiment of the present invention. Explanation of symbols 11 is CPU (Central Processing Unit), 1
2 is a line control device (main control unit of CCU), 13 is a line adapter, 14 is a modem unit (FCU) for communicating with FAX, 15 is a network control device, 16 is a switch, 17 is a public communication line, 18 is FAX, 21 is command register, 22 is line buffer A, 2
3 is a line buffer B, 24 is an image buffer, and 25 is a data bus.

Claims (1)

[Scope of Claims] 1. A line adapter equipped with a line buffer that stores at least one line of dot pattern data, and a main control device that stores a plurality of lines of dot pattern data to be transferred, the main control device comprising: In the system, the main line adapter transmits the stored dot pattern data in response to a transfer request, and the line adapter transfers the sent dot pattern data for each line via a line buffer. If the dot pattern data of the line to be transferred is the same as the blank line and/or the previous line, the control device issues a command with a smaller amount of information than the dot pattern data, which is predetermined in each case and is different from the previous line. the information is sent to the line adapter, and if the data of the line to be transferred is a blank line or is not the same as the previous line, the dot pattern data of the transfer line is sent to the line adapter, the line adapter The data transfer method is characterized in that, when the information sent from the main control device is the command information, data corresponding to the command is transferred.