JPH03268666A - Facsimile communication connection device - Google Patents

Abstract

PURPOSE:To attain the communication with an equipment at a fast communication speed by converting an encoded data with encoding data conversion logic. CONSTITUTION:A control microprocessor 12 controls an SCSI controller 7 to receive a header part of a data transferred from a host computer through a control bus 14 and when a data received succeedingly is an encoded data, a command is publicated to a port control section 10 in an encoded data conversion logic 13 to use an inverted port 9. Then the direct memory access mode is set to the controller 7 to start the reception and the encoded data is converted simultaneously as the reception and the data after conversion is stored in a memory 11 through a direct access bus 15. Thus, the data is received and converted without loading the microprocessor 12 and a data is outputted without reducing the communication speed to a group 4 facsimile equipment.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an image data conversion method for a facsimile communication connection device for connecting a host computer and a facsimile machine and outputting data from the host computer to the facsimile machine.

[Prior Art] Conventionally, data between a host computer and a facsimile communication connection device is based on pixel information or CCI TT Recommendations T, 4 or T, in which one white and black point is treated as one bit of data.
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Encoding methods such as MR and MMR were used.

However, when such an encoding method is used, the relationship between the lowest bit and the highest bit of the encoded data is often different between the host computer and the facsimile.

Conventionally, these differences have been converted using software within the facsimile communication connection device.

[Problem to be Solved by the Invention] The above prior art is a method used in a facsimile communication connection device for connecting to a Group 3 standard facsimile described in CCI TT Recommendation T, 563. When applied to a facsimile communication connection device that connects to a Group 4 standard facsimile described in , the following problems arise.

(1) When trying to transmit data using pixels, Group 4 facsimile requires a larger amount of data than Group 3 facsimile, and the data transfer speed of Group 4 facsimile is about 7 times that of Group 3 facsimile. , the amount of data transferred between the host computer and the facsimile communication connection device increases and the processing speed decreases.

(2) When using the encoding method, the amount of data transferred between the host computer and the facsimile communication connection device is reduced, but since it requires software conversion processing, high-speed processing is required like Group 4 facsimile. The software load on the device increases.

[Means for solving the problem] In order to achieve the above object, an encoding method is used for data transfer between the host computer and the facsimile communication connection device in order to reduce the amount of data transferred, and the conversion of the encoded data is In order to perform conversion at high speed, instead of converting using software, logic is added to convert only encoded data when data is received by a facsimile communication connection device.

[Effect 1] Since the coded data conversion logic converts only the coded data part at high speed without intervening software while receiving data from the host, the processing capacity of the facsimile communication connection device is not reduced. This makes it possible to communicate with a device with a high communication speed, such as a Group 4 facsimile.

Embodiment] Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 4.

FIG. 1 is a diagram showing the system configuration of the present invention. l
indicates a host computer, which is connected to the facsimile communication connection device 3 by the SO8 communication procedure 2. 3 facsimile communications connections are connected to 5 group 4 facsimiles through 4 l5DNs.

That is, in this embodiment, after converting encoded data sent from a host computer so that it can be output to a group 4 facsimile using a facsimile communication connection device,
This is a system that outputs to Group 4 facsimile through a DN line.

In the system configuration shown in FIG. 1, there are differences between the encoded data sent from the host computer and the encoded data used in the group 4 facsimile, as shown in FIG. FIG. 2(1) shows the bit generation order in encoded data. Here, the first bit is defined as Q, and is hereinafter defined as Q, , Q, -1-, corresponding to the order of encoding occurrence. FIG. 2 (2) shows the bit arrangement in one byte in a host computer and the bit arrangement in a facsimile. As shown in FIG. 2 (2), the host computer and facsimile have a difference in Q bit of 2" and 2 degrees. Therefore, it is necessary to convert this difference within the facsimile communication connection device. The diagram shows the logic necessary for conversion, and FIG. 4 shows the procedure for conversion.

In FIG. 3, 6 indicates a 5C3I connected to the host computer. The SC3I is controlled by a 5C3I controller 7 within the facsimile communication connection device. 5C
The 3I controller is connected to 11 memories through encoded data conversion logic 13 consisting of 8 non-inverting ports, 9 inverting ports, and 10 boat controls. Each section described above is controlled by 12 control microprocessors.

FIG. 4 shows the processing procedure in the control microprocessor. The control microprocessor 12 issues commands to the boat control 10 within the encoded data conversion logic 13 to
Initial settings are made so that the data from the I controller 7 passes through the non-inverted baud +-8 (FIG. 4, 16). Thereafter, the control microprocessor 12 controls the SC3I controller 7 to receive part of the header of the data transferred from the host through the control bus 4 (FIG. 4, 17). If the data received thereafter is encoded data according to a part of the received header, the control microprocessor 12 issues a command to the boat control unit 10 to use an inverted port, and the data to be received is is other than encoded data, the settings of the boat control unit 1o are not changed (see Fig. 4, 1).
8.1.9).

Next, the control microprocessor 12 sets the 5C8I controller 7 to direct memory access mode,
Start reception (Figure 4, 20).

Upon starting reception, the SC3I controller 7 writes data directly to the memory 11 via the direct access bus. At this time, if the inversion port 9 is set, the received encoded data is subjected to bit conversion at the same time as it is received, and the converted data is stored in the memory 11. During the reception process, the control microprocessor 12 only waits for the reception process to end (FIG. 4, 21).
Therefore, during this time, the procedures in group 4 facsimile (each process of the Is○7 layer) can be processed. When all reception processing is completed, the control microprocessor 12 checks whether there are any errors in the received data, and if there are no errors, it terminates normally (Fig. 4, 23), and if an error occurs, it is determined that an error has occurred. is reported to the host computer and the reception process is terminated (Fig. 4, 24).
).

As described above, according to this embodiment, data from the host computer can be received and converted without imposing a load on the control microprocessor.

〔Effect of the invention〕

According to the present invention, encoded data sent from a host computer can be received and converted without imposing a load on the control microprocessor of the facsimile communication connection device, so it is possible to receive and convert encoded data sent from a host computer at high speed and Data can be output without reducing communication speed even for facsimile machines that must transfer large amounts of data.

[Brief explanation of drawings]

Figure 1 is a system configuration diagram of an embodiment of the present invention, Figures 2 (1) and (2) are diagrams showing the arrangement of encoded data, and Figure 3 is a diagram showing the arrangement of encoded data.
This figure shows the host interface part of the facsimile communication connection device, and FIG. 4 is a flowchart showing the control procedure of the encoded data conversion logic. 1--Host computer. 2---3C3I communication procedure line. 3---Facsimile communication connection device. 4---ISDN line. 5-11 Group 4 Facsimile. Line based on 5C3I communication procedure. 7---5C3I controller. 8--One non-inverting port. 9-m=inversion port. 10---Beau]・Control. 11-m-memory. 12--A control microprocessor. 13--1 encoded data conversion logic. 14-m-control bus. 15-m-direct access bus. Fig. 1 1...Host computer 2...Line 3 according to SCSI communication procedure...Facsimile communication connection device 4...l5DN line 5...Group 4 facsimile Fig. 2 ()Q. Q. Q, Q, Q. Encoding generation order Q,... Figure 2 (2) Figure 4

Claims (1)

[Claims] 1. A facsimile communication connection device for outputting data sent from a host computer to a facsimile machine, characterized by having coded data conversion logic that changes bits while receiving coded data from the host computer. Communication connection device.