JP3228796B2 - Protocol converter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protocol converter for connecting an information processing apparatus to a group 3 facsimile (G3 FAX).

[0002]

2. Description of the Related Art Conventionally, as described in "Facsimile Communication System" of Japanese Patent Application Laid-Open No. 62-204654, G3FA
In order to connect the X.X to the packet network, an adapter device is provided between the G3 FAX and the packet network, and the adapter device executes the G3 facsimile procedure recommended by CCITT in the X.X. 25 procedures or X.25 A method of converting 25 procedures into G3 facsimile procedures has been proposed.

Further, a method has been proposed in which a printout output from a host computer is output to a facsimile via an adapter device.

[0004]

However, the above-mentioned prior art does not disclose any method for connecting a G3 FAX to a data terminal device such as a personal computer, so that the data terminal device can be easily connected to the G3 FAX. Could not. An object of the present invention is to provide a protocol conversion device that can easily connect a G3 FAX to a data terminal device such as a personal computer and can communicate with each other.

[0005]

A protocol conversion apparatus for converting a facsimile communication procedure into a bi-sync communication procedure, a means for generating one identification message based on destination information obtained in a pre-facsimile procedure, and a facsimile image data Means for generating a control message corresponding to a facsimile communication procedure signal exchanged when performing facsimile communication, and means for generating a plurality of facsimile messages by dividing the block into a plurality of blocks, I do.

[0006]

With the above arrangement, the G3 FAX can be easily connected to a data terminal such as a personal computer, and the data terminal can perform facsimile communication with the G3 FAX.

[0007]

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

[0008] 1. 1. System Configuration FIG. 1 is a system configuration diagram showing a system configuration of the present invention. In FIG. 1, a data terminal device (DTE) 2 is connected to one of the protocol conversion devices 1 via modems 6 and 7.
Is connected, and the other is connected to G3 FAX3. The protocol conversion device 1 controls a communication connection between the data terminal device 2 and the G3 FAX 3 (so-called,
Protocol conversion).

The data terminal device 2 is, for example, a personal computer, and includes a central control unit (CPU) 21,
A display 23; a display control device (CRTC) 22 for controlling the display 23;
And a keyboard control device (2
4) an external storage device 27 such as a hard disk and an external storage device control device (HDC) for controlling the external storage device 27
26, a temporary storage device (RAM) 28, and a fixed storage device (ROM). Also, an interface device (I / F) 30 that interfaces with the protocol conversion device via the modem 7, the communication line 4, and the modem 6.
Is provided. This interface device 30 has an EIA
, A so-called RS-232C interface, which is a modem interface conforming to the recommendations of Further, the interface device 30 compresses the image information in the MR or MH format and stores the image information in the MMR or MH format.
An image compression / expansion control device (DICEP) 30 'for expanding image information compressed by the system is connected, and converts normal image information into FAX image data. In addition,
Each device in the data terminal device 2 is connected to the bus 31, all of which are logically connected to the central control device 21 via the bus 31, and operates under the control of the central control device 21. . The G3 FAX 3 is a normal facsimile machine, and is connected to the protocol converter 1 via a two-wire communication line 5.

[0010] 2. 2. Protocol Converter 2.1 External View FIG. 2 is a front perspective view of the protocol converter 1. In FIG. 2, an operation panel 101 is provided on the front surface,
The operation panel 101 includes a maintenance panel unit 101-1 for performing maintenance of the apparatus and an L for displaying the state of the apparatus.
And an ED section 101-2. Further, a ventilation hole 102 for heat radiation is provided on a side surface of the housing. FIG. 3 is a rear perspective view of the protocol conversion device 1. FIG.
, A rosette 103 on the back side to which a rosette cord 103 ′ for connecting to the G3 FAX 3 is attached;
RS-232C connection port 104 for attaching a modem interface cable 104 'for connecting to a modem
, A power switch 105, and a power cable 106 connected to an AC commercial power supply.

2.2 Configuration of Panel FIG. 4 is an enlarged view of the operation panel 101. In FIG. 4, an LED unit 101-2 includes a power LED 101-20 indicating an ON / OFF state of a power supply, and an operation enabled LE indicating that the device has completed the initial diagnosis and is ready for use.
D101-21 and a communicating LE indicating that communication is in progress
D101-22, a failure LED 101-23 indicating that the apparatus is in an abnormal state, and a test LED 101- indicating that the apparatus is in an initial diagnosis or a maintenance mode.
24 are included. The maintenance panel 101-
1 includes a dip switch 101-11 for setting the state of the apparatus such as a maintenance mode, an operation mode, and a communication speed;
Indicator 1 indicating the status or error of this device
01-10, a reset switch 101-12 for returning the apparatus to an initial state, a function switch 101-13 for setting a mode of various tests by shifting to a maintenance mode together with the reset switch 101-12,
Test execution switches 101-14 and 101-15 for designating execution of various tests in the maintenance mode are included.

2.3 Hardware Configuration FIG. 5 is a block diagram showing the hardware configuration of the protocol converter according to the present invention. In FIG. 5, a protocol conversion device 1 includes a main control device (MAIN CPU) 1
07 and the sub-control device (SUB CPU) 108
It has two control units. The main control device 107
The sub-controller 108 controls the entire protocol conversion device, and is under control. The sub control device 108 controls communication with the G3FAX3.

The bus (MAIN) on the main control unit 107 side
The bus 117 includes a fixed storage device (ROM-B) 109 that stores a control program for the main control device 107 to perform a processing operation, and a temporary storage device when the main control device 107 performs control. A temporary storage device (RAM-B) 110 for storing data is connected, and the fixed storage device 109 and the temporary storage device 110 are connected.
The control is performed by and. Operation panel 1
A panel controller (KDC) for controlling the maintenance panel 101 is connected to the bus 117.
Display and key scan control are controlled by the main controller 107. The multi-protocol serial controller (MPSC-B) 112 performs parallel-serial conversion of data in accordance with a predetermined format, and is connected to the bus 117 and an RS-232C controller 113 which forms an interface of the RS-232C. ing.

On the other hand, the bus (SU
The B bus 127 has a fixed storage device (ROM-A) 118 that stores a control program for the sub-control device 108 to perform a processing operation, and a temporary storage device when the sub-control device 108 performs control. And a temporary storage device (RAM-A) 119 for storing data in the
Control is performed by the fixed storage device 118 and the temporary storage device 119. A line control unit (NCU) 123 which interfaces with G3 FAX3
And T. of CCITT. In compliance with the 30 Recommendations, the so-called
A facsimile modem (MODEM) 125 for implementing a G3 facsimile modulation / demodulation procedure, and a multi-protocol serial controller (MPSC-A) for performing parallel-serial conversion of data according to a predetermined format.
124, an image compression / expansion control device (DICE) for compressing image information by the MR or MH method and expanding the image information compressed by the MMR or MH method.
P) 121 and an image storage device (DPRAM-A) 120 for temporarily storing image information are connected to the bus 127 and operate under the control of the sub-control device 108.

The image compression / decompression control device 121 includes:
The image storage device 120 is connected by an image bus 122, and image information is transmitted and received by the image bus 122. A line controller 123 and a multi-protocol serial controller 124 are connected to the facsimile modem 125, and image information is modulated and demodulated by the facsimile
It is configured to transmit to and receive from 3FAX3.

Further, on both buses 117 and 127, the main control unit 107 and the sub control unit 108 are provided with a data transmission / reception device (DPRAM-B) 114 which is a temporary storage device for transmitting / receiving control data. And two image information transmission / reception devices (DPRAM-C, D) 115 and 116 which are temporary storage devices for transmitting and receiving image information, are connected to each other. Control data and image information are transmitted and received to and from the device 108.

FIG. 6 is a diagram showing an outline of the internal configuration of the line control device 123 shown in FIG. 6, the line controller 123 includes a bus interface 601 and is controlled by the sub controller 108.
A relay (IR) 602 for transmitting an incoming signal (for example, an AC signal of 75 V and 20 Hz) to the G3FAX3, a communication current for the G3FAX3, and a current supply for detecting a loop of the G3FAX3 are supplied to the bus interface 601. A circuit (PS) 603 is connected. A current is supplied from the current supply circuit 603 to the G3FAX via the relay contact ir and the wire CL. When the G3FAX3 forms a loop and the current flows, it is detected from the loop detection terminal (LOOP) of the current supply circuit 603. A signal is output.

A ringing power supply CR for generating a 75 V, 20 Hz AC signal is provided. When the relay (IR) 602 operates under the control of the sub-control unit 108, the AC signal is transmitted to the relay contact ir and the wire ring. It is supplied to G3FAX3 via CL, resistor R0, and power supply E.
Further, the lines L1 and L2 (the rosette code 103 ') from the G3 FAX 3 are connected to the facsimile modem 125 via the DC cut capacitors C0 and C1 from the subsequent stage of the relay contact ir.

FIG. 7 shows the protocol converter 1 and the G3FA
It is a figure showing composition of rosette cord 103 'which connects X3. In FIG. 7, the configuration is such that the rosette cord 103 'is connected to two terminals outside the modular plug 701 on the protocol conversion device 1 side and the rosette code 103' is connected to two terminals inside the modular plug 702 on the G3 FAX3 side. I have. This regulates the connection between the protocol converter 1 and the G3 FAX3.

3. 3. Interface Conditions 3.1 Interface Conditions between Protocol Conversion Device and Data Terminal Device FIG. 8 is a diagram showing interface conditions between the protocol conversion device 1 and the data terminal device 2. The protocol conversion device 1 and the data terminal device 2
32C interface, modem 6,7
The communication control is performed by a bit-oriented synchronous procedure (HDLC procedure) via. 8, the interface conditions between the protocol conversion device 1 and the data terminal device 2 will be described in detail. The synchronization mode is synchronous synchronization (SY).
N synchronization), the transmission speed is 19.2 kbps, and the electrical interface is V. CCITT recommendation. 28, transmission mode is transparent mode, connection mode is contention mode, communication mode is half-duplex communication mode, transmission error detection mode is C
The RC method and the facsimile data from the data terminal device 2 are in MH or MR coding.

3.2 Protocol Converter and G3 FAX
FIG. 9 is a diagram showing interface conditions between the protocol conversion device 1 and the G3 FAX3. Protocol converter 1
The interface between G3FAX3 and G3FAX3 is based on CCITT Recommendation T. Communication control is performed by a so-called G3 facsimile procedure conforming to G.30. Referring to FIG. 9, the interface conditions between the protocol converter 1 and the G3 FAX3 will be described in detail. The main scanning line density is 8 dots / mm, and the sub-scanning line density is 7.7 lines / mm or 3.85 lines / m.
m, document size is A4 or B5 size, minimum transmission time is 10 mS and 3.85 at 7.7 line / mm
20 mS in line / mm, MH or MR coding method, and 9600 bps transmission speed,
7200 bps, 4800 bps or 2400 bps
And

3.3 Connection State between Protocol Conversion Apparatus and Modem FIG. 10 shows the connection state between the protocol conversion apparatus 1 and the modem 6, and shows the signal line name of the RS232-C interface, its signal direction, FIG. 2 is a diagram illustrating the meaning of the signal line. In FIG. 10, the meanings of the signals will be described. An RD signal is a data signal transmitted by the protocol conversion device 1, an SD signal is a data signal received by the protocol conversion device 1, and an RS signal is a data signal transmitted by the data terminal device 2. The transmission request signal to be received, the CS signal is a response signal from the protocol conversion device 1 to the transmission request signal from the data terminal device 2, the DR signal is a status display signal indicating that the protocol conversion device 1 is operable, and the CD signal is A signal indicating that the protocol converter 1 has detected the received carrier, a T1 signal is a signal indicating that the protocol converter 1 is under test, and ST2 is a transmission signal element timing supplied by the protocol converter 1 to the data terminal device 2. And the RT signal are the protocol converter 1
Is a signal indicating the reception signal element timing supplied to the data terminal device 2. The SG signal is used as a signal return, and the FG signal is a frame ground.

3.4 Format of Information Block FIG. 11 is a diagram showing a format of an information block transmitted and received between the protocol conversion device 1 and the data terminal device 2, and FIG. 12 is a diagram showing the information block shown in FIG. FIG. 5 is a diagram for explaining the meaning of a character used in the format of FIG. 11 and 12, DLEs 1101, 1
106 is a character indicating that the transmission control function has been extended, STX1102 is a character indicating the end of the header and the start of a text block, identifier 1103 is an area indicating command name information of data to be transmitted, and effective data byte length (L) 1104 Is an area indicating the byte length of data to be transmitted, data 1105 is an area of data to be transmitted (FAX image data, control data, etc.), and ETB / ETX11.
In the case of ETB, a character indicating the end of a heading block or the end of a text block in a case where the text is divided and transmitted, and in the case of ETX, a character indicating the end of the text. In addition, CRC11
08 is an area of additional information for detecting a transmission error.

FIG. 13 shows an information block transmitted and received between the protocol conversion device 1 and the data terminal device 2. The command name notified by the text information portion (identifier 1103) of the format shown in FIG. It is a figure explaining a meaning. In FIG. 13, “message identification” is a command for notifying the start of a message, and “message end log” is a FAX transmission /
A command for notifying the completion of reception, “page identification (MP
S) "indicates that the fax image data is being transmitted.
At the end of a page, a command for notifying that there is a next page, “page identification (EOP)” is a command for notifying the end of transmission of the last page of FAX image data, and “abort message” detects an abnormality in the data terminal device. When this is done, a command to notify the protocol converter of abandonment of the message in the middle, “FAX image data” is a command to notify the transmission of FAX image data compressed by the MH or MR encoding method, and “Data request” is a protocol conversion FAX on device side
A command for notifying the data terminal device that the preparation for receiving the image data is completed, the "adapter log request" is a command for the data terminal device to send a log data transmission request in the protocol conversion device to the protocol conversion device, and ,
"Adapter log data" is a command by which the protocol conversion device notifies the data terminal device that log data in the protocol conversion device has been transmitted.

3.5 Control Signals Used in Communication Protocol FIG. 14 is a diagram for explaining control signal names used in the communication protocol between the protocol conversion device and the data terminal device and their meanings. In FIG. 14, "EOT"
Is a signal indicating the end of transmission of the information block (heading block, text block) or termination, "ENQ"
Is a signal used to invite the other party to receive a signal as a selecting sequence or to prompt a response to an information block. "ACK0" and "ACK1" are signals indicating an acknowledgment of the selecting sequence or the information block. "NAK" is a signal indicating a negative response of the selecting sequence or the information block, "WAC".
"K" is used as a response to a selecting sequence or an information block (which has a positive meaning for an information block), and a signal indicating that the reception of the next information block is temporarily impossible. "RVI" is used as an acknowledgment for an information block and indicates that it is requesting a transmission right, and "TTD" indicates that the information block to be transmitted next is not yet ready for transmission. Or a signal used when intentionally terminating transmission abnormally. Note that “ACK0” and “A
“CK1” is configured to be transmitted alternately when an acknowledgment is made, thereby facilitating the state management of the communication protocol.

4. Overview of Operation of Protocol Conversion Device 4.1 Data Transmission from G3 FAX to Data Terminal Device FIG.
FIG. 4 is a diagram illustrating an outline of an operation of the protocol conversion device 1 when transmitting image data. First, the line between the G3 FAX 3 and the line controller 123 is established by the line controller 123, and a facsimile connection sequence (pre-procedure sequence) between the facsimile modem 125 and the G3 FAX 3 is performed. Device 123,
And received by the multi-protocol serial controller 124 via the facsimile modem 125 (A
1). In this case, the pre-procedure information blade, the sub-control device 10
8 to the data transmission / reception device 114 as operation information (A5).

Next, the facsimile modem 125 sets the FA
The X image data is converted into parallel data according to a predetermined format and transferred to the temporary storage device 119 (A2).
Next, the FAX image data stored in the temporary storage device 119 is transferred to the image compression / expansion control device 121, and the FAX image data is converted into normal image data together with the image storage device 120, and the RTC signal (FAX image data (A3), which indicates the end of the process (to be described later in detail) (A3). Next, the FAX image data stored in the temporary storage device 119 is transferred to the image information transmitting / receiving devices 115 and 116 (A4), and the sub control device 108 writes the operation end information in the data transmitting / receiving device 114 (A5).

Next, the main control unit 107 reads the operation end information of the sub control unit 108 from the data transmission / reception unit 114 (A6), and the image information transmission / reception units 115, 11
FAX image data stored in the temporary storage device 110
(A7). Next, the FAX image data stored in the temporary storage device 110 is transferred to the multi-protocol serial controller 112, and the FAX image data in the parallel format is transmitted.
Converts the image data to serial FAX image data,
The data is transmitted to the data terminal device 2 via the S-232C controller 113 (A8). Thus, G3FAX3
Transmits the FAX image data to the data terminal device 2.

4.1 Data Transmission from Data Terminal Device to G3 FAX FIG. 16 shows a facsimile transmission from data terminal device 2 to G3 FAX 3.
FIG. 4 is a diagram illustrating an outline of an operation of the protocol conversion device 1 when transmitting image data. First, F from the data terminal device 2
AX image data is transmitted to the multi-protocol serial controller 112 via the RS-232C controller 113.
The FAX image data in the serial format received and transferred to the FAX image data in the parallel format is converted into the FAX image data in the parallel format.
10 (B1). Next, the facsimile image data stored in the temporary storage device 110 is transferred to the image information transmitting / receiving device 1.
15 and 116 (B2), and the main controller 107
Writes the operation end information in the data transmitting / receiving device 114 (B3).

Next, the sub control unit 108 reads the operation end information of the main control unit 107 from the data transmission / reception unit 114 (B4), and the image information transmission / reception units 115, 11
6 stores the fax image data stored in the temporary storage device 119
(B5), and further transfers the FAX image data temporarily stored in the temporary storage device 119 to the facsimile modem 125 (B6). Next, the facsimile modem 125 transfers the FAX image data in the parallel format to the G3 FAX 3 via the line controller 123 (B7). As described above, the data terminal device 2 sends the fax to the G3 fax 3
Send image data.

5. Description of Communication Operation 5.1 Communication Operation from G3 FAX to Data Terminal Device (Normal Communication) FIGS. 17 to 19 are diagrams showing a sequence of a normal communication operation when performing facsimile communication from the G3 FAX to the data terminal device. . 17 to 19,
As described above, the protocol converter 1 and the G3 FAX 3 communicate with each other according to the CCITT Recommendation T. 30. Hereinafter, the operation will be described. First, when the G3 FAX 3 closes the loop and calls the protocol conversion device 1 (170)
1), the protocol conversion device 1 returns a response signal (1702). Next, the protocol conversion device 1 outputs a called station identification signal (CED), a called terminal identification signal (CSI),
And the digital identification signal (DIS) is transmitted to the G3 FAX 3 (1703, 1704, 1705). On the other hand, in G3FAX3, the digital command signal (DC
S) and the transmitting terminal identification signal (TSI) is returned (1).
706, 1707). In this way, both terminals perform negotiation, identify the capabilities of the terminals, and transmit a training signal (1708).

Next, the protocol conversion device 1
A reception preparation confirmation signal (CFR) is transmitted to X3 (1
709), the G3 FAX 3 transmits the FAX image data to the protocol conversion device 1 (1710). Further, the protocol conversion device 1 transmits an ENQ to the DTE 2 (1
711), and receives ACK0 from DTE2 (171).
2) Send a message identification command to DTE2 (1713). The message identification command includes information indicating the capability of the G3 FAX 3 obtained by the negotiation. Next, the protocol conversion device 1
Receives ACK1 (1714) and sets EOT to DTE2
(1715). As described above, the message identification command is transmitted to the DTE 2 in the sequence from 1711 to 1715, and the DTE 2 prepares to receive FAX image data.

Next, the protocol conversion device 1 uses the G3 FAX
3 executes a sequence of transmitting one block (maximum number of bytes specified in advance) of the FAX image data received from DTE2 to DTE2. More specifically, first, an ENQ is transmitted to DTE2 (1716), and AC from DTE2 is transmitted.
K0 is received (1717). Next, a fax image data command including fax image data for one block received from the G3 fax 3 is transmitted to the DTE 2 (171).
7). Next, ACK1 is received from DTE2 (171).
9) FAX image data for one block is transmitted. Similarly, FAX image data for one page is transmitted to DTE2 one block at a time (1720, 1721, 172).
2, 1723), when transmission of one page of FAX image data is completed, EOT is transmitted to DTE2 (1724).
In the FAX image data command of the last block, the end of the text block is ETX. G3F
AX3 finishes transmitting one page of FAX image data,
The multi-page signal (MPS) is transmitted (1725). When the protocol conversion device 1 receives the multi-page signal (MPS), it transmits an ENQ to the DTE 2 (1726). ACK for this
0 is received (1727), the page identification command is
The data is transmitted to TE2 (1728). On the other hand, when ACK1 is received (1729), EOT is transmitted to DTE2 (1730), and a message confirmation signal (MCF) is transmitted to G3FAX3 (1731).

On the other hand, the G3 FAX 3 receives the MCF and transmits the FAX image data of the next page (the last page in this embodiment) to the protocol converter 1 (173).
2). Then, the protocol conversion device 1 similarly transmits a FAX image data command to the DTE 2 according to a predetermined procedure (1733 to 1737). Next, G3FAX3
Terminates transmission of all FAX image data, and outputs a procedure end signal (E
OP) (1738), the protocol converter 1 returns an MCF (1739), and the G3FAX3
When the disconnection signal is received (1740), disconnection processing is performed thereafter. Describing the disconnection process, first, the protocol conversion device 1 transmits an ENQ to the DTE 2 (1741) and receives ACK0 from the DTE 2 (1
742), and transmits a page identification command to DTE2 (1743). Next, transmission and reception of ACK1 and EOT are performed (1744, 1745). Next, after transmitting / receiving ENQ and ACK0 to / from DTE2 (1746, 1747), protocol converter 1 transmits a message end log command (1748), and receives ACK1 (174).
9) The EOT is transmitted (1750). Further, the protocol conversion device 1 transmits a disconnection signal to the G3 FAX 3 (1751), and ends the processing. As described above, G3F
A communication operation from the AX to the data terminal device is performed.

FIG. 20 is a diagram for explaining the concept of how the DTE 2 and the G3 FAX 3 transmit and receive FAX image data via the protocol converter 1. Between the protocol converter 1 and the G3 FAX3, the CCITT T. FAX image data 203 having a data structure conforming to Recommendation 30 is transmitted and received, edited by the protocol converter 1, converted into a plurality of (sometimes one depending on the amount of information) FAX image data commands 201, and transmitted and received with the DTE 2. Is possible. The RTC 20 included in the FAX image data 203
2 'is also transmitted and received as a part of the FAX image data command 201 as indicated by reference numeral 202.

5.2 Communication Operation from Data Terminal Device to G3 FAX (Normal Communication) FIGS.
FIG. 9 is a diagram showing a sequence of a normal communication operation when performing facsimile communication. Hereinafter, the operation will be described. FIG.
In FIG. 23 to FIG. 23, the DTE 2 transmits an ENQ to the protocol conversion device 1 (2101), and upon receiving ACK0 from the protocol conversion device 1 (2102), transmits a message identification command indicating a transmission request including capability information of the terminal. (2103). Next, the protocol conversion device 1
ACK1 is received (2104) from the
T is returned (2105), and the occurrence of the message is notified to the protocol conversion device 1.

On the other hand, after receiving the message identification command, the protocol conversion device 1 transmits a call signal to the G3 FAX 3 (2106). Then, the G3 FAX 3 transmits the response signal, CED, CSI, and the G3 FAX 3 DIS to the protocol conversion device 1 (2107, 210).
8, 2109, 2110). Next, the protocol conversion device 1 transmits the DCS and the TSI generated based on the capability information of the protocol conversion device 1 and the G3 FAX 3 DIS information included in the message identification command (211).
1, 11212), perform negotiation, and transmit a training signal (2113). Next, upon receiving the CFR from the G3FAX3 (2114), the protocol conversion device 1 transmits an ENQ to the DTE2 (211).
5) Receive ACK0 (2116) and transmit a data request command (2117). Next, ACK1 is received (2118), and then EOT is transmitted (211).
9) Request data transmission. Then, DTE2
Transmits the ENQ to the protocol conversion device 1 (212
0), ACK0 is received (2121), and a FAX image data command including FAX image data corresponding to the first block of the first page is transmitted (2122). On the other hand, upon receiving the FAX image data command, the protocol conversion device 1 transmits ACK1 to the DTE2 (2123), extracts the FAX image data, and transmits the FAX image data to the G3FAX3 (2124). Hereafter, DT
Similarly, E2 divides the FAX image data command appropriately and transmits it (2125, 2126, 2127, 212).
8) When transmission of one page is completed, EOT is transmitted (2129). The protocol conversion device 1 converts the FAX image data divided and sent to one page of FAX image data.
The image data is edited and transmitted to G3FAX3.

Next, after the transmission of the facsimile image data for one page is completed, the DTE 2
NQ is transmitted to the protocol converter 1 (2130), and A
When CK0 is received (2131), a page identification command indicating that there is a next page is transmitted (2132). Next, ACK1 is received (2133), EOT is transmitted (2134), and the protocol converter 1 is notified that there is a next page. Then, the protocol conversion device 1
The MPS is transmitted to G3FAX3 (21 59 ), and G3FA
Upon receiving the MC F from X3 (21 60), transmits the ENQ to DTE 2 (2135), receives the ACK0 (2
136), and transmits a data request command for requesting FAX image data of the next page (2137). Then AC
K1 is received (2138), and EOT is transmitted (213).
9) Request the DTE 2 for FAX image data of the next page. On the other hand, in DTE2, when receiving the data request command, it transmits ENQ (2140), receives ACK0 (2141), and transmits a FAX image data command including FAX image data of the next page (2142). ),
ACK1 is received (2143). In this embodiment, since this is the last block of the last page,
The OT is transmitted (2144). The protocol conversion device 1 extracts the FAX image data from the received FAX image data command and transmits the FAX image data to the G3 FAX 3 (21 61 ).

Next, the DTE 2 transmits an ENQ (21)
45), ACK0 is received (2146), and a page identification command indicating that the transmission of the last page has been completed is transmitted (2147). Next, ACK1 is received (214
8) The EOT is transmitted (2149), and the end of the FAX image data transmission of the last block of the last page is notified to the protocol conversion device 1. On the other hand, the protocol conversion device 1 transmits EOP to G3FAX3 (2150),
The MCF is received (2151). Next, after transmitting / receiving the ENQ and ACK0 to / from the DTE 2 (2152, 2153), the protocol converter 1 transmits a message end log command (2154), and receives the ACK1 (21
55), and transmits EOT (2156). Further, the protocol conversion device 1 transmits a disconnection signal to the G3 FAX 3 (2157), receives the disconnection signal from the G3 FAX 3 (2158), and ends the processing. As described above, the communication operation from the data terminal device to the G3 FAX is performed.

5.3 Outgoing Collision FIG. 24 shows that DTE2 and G3FAX3 simultaneously transmit,
FIG. 9 is a sequence diagram illustrating an operation when a transmission collision occurs.
The DTE 2 transmits an ENQ to the protocol conversion device 1 (2401), and upon receiving ACK0 from the protocol conversion device 1 (2402), transmits a message identification command indicating a transmission request including terminal capability information (240).
3). Next, ACK1 is received from the protocol conversion device 1 (2404), and EOT is returned to it (2404).
405), the occurrence of the message is notified to the protocol conversion device 1. On the other hand, at the same time, when the G3 FAX 3 closes the loop and makes a call to the protocol conversion device 1 (240
6 ′), the protocol conversion device 1 recognizes the outgoing collision,
An ENQ is transmitted to DTE2 (2408), ACK0 is received (2409), and a message end log command including information indicating transmission collision is transmitted (2410). Next, ACK1 is received (2411), and then EOT is transmitted (2412) to notify DTE2 of rejection of the transmission request from DTE2 due to transmission collision.

Thereafter, when the second transmission occurs (24)
06), the protocol conversion device 1 returns a response signal to the G3 FAX 3 (2407), and the CED, CSI, and DI
S to G3FAX3 (2413, 2414, 2)
415). On the other hand, G3FAX3 returns DCS and TSI (2416, 2417). In this way, both terminals perform negotiation, identify the capabilities of the terminals, and transmit a training signal (2418). The following sequence performs the same processing as the normal communication operation sequence when facsimile communication is performed from the G3 FAX to the data terminal device described with reference to FIGS. Thus, the processing sequence at the time of the transmission collision is performed.

5.4 Data Terminal Device Abandoned Away FIG. 25 shows that DTE2 fails when communicating FAX image data between DTE2 and G3 FAX3.
This is a processing sequence in the case where the DTE 2 aborts during transmission. When the DTE 2 transmits FAX image data to the G3 FAX 3 (2501 to 2507),
If any failure occurs in DTE2 (2509), DTE
TE2 transmits the alarm EOT to the protocol conversion device 1 (2508). Next, the DTE 2 transmits an ENQ to the protocol converter 1 (2510), and upon receiving an ACK1 from the protocol converter 1 (2511), transmits a message halfway abandon command including information indicating that a failure has occurred (2512). ). Next, ACK0 is received from the protocol conversion device 1 (2513), and EOT is returned in response thereto (2514) to notify the protocol conversion device 1 that a failure has occurred in the DTE2. Then, the protocol conversion device 1 transmits an ENQ to the DTE 2 (2515), receives the ACK 1 (2516), and transmits a message end log command including information indicating abandonment on the way (2517). Next, ACK0 is received (2
518) Then, EOT is transmitted (2519), and DT
A notification is sent to E2 to reject the transmission request from DTE2 because of a transmission collision, a disconnection signal is transmitted to G3FAX3 (2520), a disconnection signal is received from G3FAX3 (2521), and the communication process is terminated. I do.

FIG. 26 is a processing sequence in the case where a failure occurs in the DTE 2 during the pre-procedure for transmitting the FAX image data between the DTE 2 and the G3 FAX 3 and the DTE 2 abandons the transmission halfway. is there. In FIG. 26, when the DTE 2 and the G3 FAX 3 perform a pre-procedure when transmitting FAX image data via the protocol converter 1 (2601 to 2614), and the protocol converter 1 requests the DTE 2 to transmit data ( 261
5 to 2619), when a failure occurs on the DTE2 side (2620), the DTE2 notifies the protocol conversion device 1 that a failure has occurred on the DTE2, similarly to the sequence described in FIG. 25 (2621 to 262).
5), end the communication process (2626 to 263)
2). As described above, a processing sequence in the case where the transmission is abandoned is performed.

5.5 No G3 FAX Response FIG. 27 is a diagram showing a processing sequence when the G3 FAX does not respond. In FIG. 27, the DTE 2 issues a transmission request to the protocol conversion device 1 (2701 through 27).
05), and accordingly, the protocol conversion device 1
A call signal is transmitted to AX3 (2706). At this time, in the state of out of paper, not in automatic incoming call mode, fax failure, etc.
If G3FAX3 does not respond to the protocol conversion device 1,
After a predetermined time has elapsed, the protocol conversion device 1 determines that a timeout has occurred (2707), transmits an ENQ to the DTE 2 (2708), receives ACK0 (2709), and sends a message end log command including information indicating no response. Send (2710). Next, ACK1 is received (271).
1) Then, EOT is transmitted (2712), and DTE2
G3FAX3 sends a notification that transmission is rejected because there is no response. Thus, the processing sequence when the G3 FAX does not respond is performed.

5.6 G3 FAX Out of Paper FIG. 28 is a diagram showing a processing sequence when G3 FAX 3 is out of paper. In FIG. 28, DTE2 and G3F
If communication of FAX image data is normally performed with AX3 (2801 to 2807), and there is FAX image data of the next page, the DTE 2 determines that the protocol conversion device 1 has the next page. The page identification command shown is transmitted (2808 to 2812). Then
The protocol conversion device 1 transmits an MPS to the G3 FAX 3 (2813), but receives a procedure interruption acknowledgment signal (PIP) indicating a paper out from the G3 FAX 3 (2814).
An ENQ is transmitted to DTE2 (2815), ACK1 is received (2816), and a message end log command including information indicating that G3FAX3 is out of paper is transmitted (2817). Next, ACK0 is received (281).
8), EOT is transmitted (2819), and further, the protocol conversion device 1 transmits a disconnection signal to the G3 FAX 3 (282).
0), and receives the disconnection signal from G3FAX3 (282)
1) End the process. In this way, the processing sequence when G3FAX3 is out of paper is performed.

5.7 FAX Procedure Error FIGS. 29 and 30 show the protocol converter 1 and the G3F
This is a processing sequence when a FAX procedure error occurs with AX3. In FIG. 29, when an error occurs in the pre-FAX procedure between the protocol conversion device 1 and the G3 FAX 3 (2901 to 2906), the protocol conversion device 1 transmits a disconnection signal to the G3 FAX 3 (290).
7) After receiving the disconnection signal from G3FAX3 (290)
8) End the processing sequence. Referring to FIG. 30, when an error occurs (3007) during transmission of FAX image data between the protocol conversion device 1 and the G3 FAX 3 (3001 to 3005), the protocol conversion device 1
An alarm EOT is transmitted to TE2 (3006).
Next, ENQ is transmitted to DTE2 (3008), and AC
K0 is received (3009), and a message end log command including information indicating a procedure error is transmitted (3010). Next, ACK1 is received (301
1), transmits EOT (3012), and further, the protocol conversion device 1 transmits a disconnection signal to the G3 FAX 3 (301).
3) Receive the disconnection signal from G3FAX3 (301)
4), end the process.

5.8 Procedure Error Between Data Terminal Device and Protocol Conversion Device FIGS. 31 to 33 show a processing sequence when a procedure error occurs between the data terminal device and the protocol conversion device. In FIG. 31, the protocol converter 1 and G
The pre-FAX procedure is normally performed with 3FAX3 (310).
After 1 to 3109), the protocol conversion device 1
An ENQ is transmitted to E2 (3110). In contrast, D
TE2 returns ACK0 (3111), but if it cannot be returned due to some failure, retry. Here, when the timeout occurs and the retry is over (3112), the protocol conversion device 1 sets the G3FAX3
(3114), and receives the disconnection signal from G3FAX3 (3115), and terminates the process. Therefore, the transmission (3113) of the FAX image data becomes invalid.

Referring to FIG. 32, during normal transmission of FAX image data (3201 through 320)
5) When a message cannot be transmitted from the protocol conversion device 1 to the DTE 2 (3206), a retry is performed. Here, when the timeout occurs and the retry is over (3207), the protocol conversion device 1 sets the G3F
A disconnection signal is sent to AX3 (3208), and G3FAX3
(3209), and terminates the process. In FIG. 33, the protocol conversion device 1 is a DTE 2
Request for transmission of a message from the server and receives ENQ (330
1), ACK0 which is a response signal to this is returned, but if transmission is not possible due to some kind of failure, retry is performed. Here, when the retry is over (330
3) A timeout occurs, the link to G3FAX3 is released (3304), and the process ends. As described above, the processing sequence when a procedural error occurs between the data terminal device and the protocol conversion device is performed.

5.9 Log Data Output FIG. 34 shows a processing sequence when log data (communication failure data and the like) stored in the protocol converter 1 is output. First, a command is input to DTE2 (3
401), when a log data output request is made, the DTE
2 transmits an ENQ to the protocol conversion device 1 (340
2) Receiving ACK0 (3403), and transmitting an adapter log request command indicating a request for log data output (3404). Next, ACK1 is received (271).
1) After that, EOT is transmitted (2712), and a request for log data output is made to the protocol conversion device 1.

On the other hand, the protocol conversion device 1 extracts the log data table T34 stored in the temporary storage device and sends it to the DTE 2. To explain this, first, D
An ENQ is transmitted to the TE2 (3407), ACK0 is received (3408), and log data of a predetermined number of bytes is transmitted on the adapter log data command to the DTE2 (3409). Next, ACK1 is received (341).
0), EOT is transmitted (3411), and log data of one block (block A) is transmitted to DTE2. Then, in DTE2, it is printed out (P34).
A) Then, log data is output. Next, similarly, all log data stored in the log data table is divided into a plurality of blocks and transmitted to the DTE 2 (3412 to 312).
421), and in DTE2, it is sequentially printed out (P
34B, P34n), output all the log data, and end the processing.

The log data is stored in the protocol converter 1
Can be output to This will be described with reference to FIG. In FIG. 35, when the operator operates the test execution switch 101-15 on the panel 101, the key-in information 3502 is read by the control program 3501. Next, the control program 3501 accesses the log data table T34 and displays the log data in the indicator 1
The data is displayed on 01-10, and log data is output. As described above, the log data can be output to either the DTE 2 or the protocol conversion device 1.

[0053]

As described above, according to the present invention, G
3FAX and a data terminal device such as a personal computer can be easily connected via a protocol conversion device,
Facsimile communication between the G3 FAX and the data terminal device can be mutually enabled.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram of the present invention.

FIG. 2 is an external view of a protocol conversion device.

FIG. 3 is an external view of a protocol conversion device.

FIG. 4 is a diagram showing a panel of a protocol conversion device.

FIG. 5 is a hardware configuration diagram of a protocol conversion device.

FIG. 6 is a configuration diagram of a network control circuit of the protocol conversion device.

FIG. 7 is a diagram showing a rosette code for connecting a protocol converter and a G3 facsimile.

FIG. 8 is a diagram illustrating interface conditions between a protocol conversion device and a data terminal device.

FIG. 9 is a diagram illustrating interface conditions between a protocol conversion device and a G3 facsimile.

FIG. 10 is a diagram illustrating a connection state between a protocol conversion device and a modem.

FIG. 11 is a diagram showing a format of an information block transmitted and received between a protocol conversion device and a data terminal device.

FIG. 12 is a diagram illustrating characters used in the format of the information block shown in FIG. 11;

FIG. 13 is a diagram illustrating command names used in the format of the information block shown in FIG. 11 and their meanings.

FIG. 14 is a diagram illustrating control signal names used in a communication protocol between a protocol conversion device and a data terminal device and their meanings.

FIG. 15 is a diagram illustrating the operation of the protocol conversion device.

FIG. 16 is a diagram illustrating the operation of the protocol conversion device.

FIG. 17 is a diagram showing a processing sequence performed by the data terminal device and the G3 facsimile via the protocol conversion device.

FIG. 18 is a diagram showing a processing sequence performed by the data terminal device and the G3 facsimile via the protocol conversion device.

FIG. 19 is a diagram showing a processing sequence performed by the data terminal device and the G3 facsimile via the protocol conversion device.

FIG. 20 is a diagram illustrating an outline of facsimile communication performed between a data terminal device and a G3 facsimile via a protocol conversion device.

FIG. 21 is a diagram showing a processing sequence performed by the data terminal device and the G3 facsimile via the protocol conversion device.

FIG. 22 is a diagram showing a processing sequence performed by the data terminal device and the G3 facsimile via the protocol conversion device.

FIG. 23 is a diagram showing a processing sequence performed by the data terminal device and the G3 facsimile via the protocol conversion device.

FIG. 24 is a diagram showing a processing sequence at the time of a transmission collision.

FIG. 25 is a diagram showing a processing sequence when a failure occurs.

FIG. 26 is a diagram showing a processing sequence when a failure occurs.

FIG. 27 is a diagram showing a processing sequence when there is no response from the G3 facsimile.

FIG. 28 is a diagram showing a processing sequence when a G3 facsimile sheet runs out.

FIG. 29 is a diagram showing a processing sequence when a procedure error occurs between the G3 facsimile-protocol converter.

FIG. 30 is a diagram showing a processing sequence when a procedure error occurs between the G3 facsimile-protocol converter.

FIG. 31 is a diagram showing a processing sequence when a procedure error occurs between the protocol conversion device and the data terminal device.

FIG. 32 is a diagram showing a processing sequence when a procedure error occurs between the protocol conversion device and the data terminal device.

FIG. 33 is a diagram showing a processing sequence when a procedure error occurs between the protocol conversion device and the data terminal device.

FIG. 34 is a diagram showing a processing sequence when outputting log data stored in a protocol conversion device.

FIG. 35 is a diagram showing another embodiment for outputting log data stored in a protocol conversion device.

[Explanation of symbols]

 1 ... Protocol conversion device 2 ... Data terminal device 3 ... G3 facsimile 4,5 ... Line 6,7 ... Modem

Continuation of the front page (56) References JP-A-57-93754 (JP, A) JP-A-1-160254 (JP, A) JP-A-63-221760 (JP, A) JP-A-63-166343 (JP) JP-A-63-102538 (JP, A) JP-A-59-63867 (JP, A) JP-A-59-178069 (JP, A) JP-A-59-224964 (JP, A) 60-10962 (JP, A) JP-A-63-266960 (JP, A) JP-A-2-35867 (JP, A) JP-A-3-26168 (JP, A) JP-A-58-119038 (JP, A) A) Japanese Utility Model Hei 4-34070 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) H04N 1/00-1/00 108

Claims (1)

(57) [Claims] 1. A protocol conversion device for converting a facsimile communication procedure into a bi-sync communication procedure, comprising: means for generating one identification message based on destination information obtained in a pre-facsimile procedure; And a means for generating a control message corresponding to a facsimile communication procedure signal exchanged when facsimile communication is performed. .