JPS6014569A - Facsimile communication system - Google Patents

Abstract

PURPOSE:To realize facsimile communication at high speed and with high efficiency by allowing the reception station side to detect whether or not various functions of the reception station are operated normally by means of a sensor thereby attaining a prescribed abnormality processing and allowing the transmission station side to conduct the prescribed abnormality processing when a procedure break signal is received amidst the transmission. CONSTITUTION:A G3 control section 30 of the reception station 10 confirms the detection signal of sensors 11, 12...1n and when it is discriminated that a fault such as paper clogging or the like takes place, the section 30 gives a command to a G2 control section 40 for the operation of a PIS transmission circuit 41 to transmit a procedure break PIS signal, displays an error code representing the content of the fault to a display section and conducts a proper abnormality processing such as the disconnection of line. When PIS detection circuit 81 of a transmission detects the PIS signal transmitted from the reception station 10, a G2 control section 80 informs it to the G3 control section. The G3 control section recognizes that the reception station 10 cannot continue the normal reception and executes the proper abnormality processing such as error display or line disconnection.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a facsimile communication system, and particularly to a system for realizing highly efficient facsimile communication in a transmitting/receiving station having both group 2 and group 30 communication modes.

[Prior art]

CCITT 5GXPI Recommendation T30 defines a procedure for document facsimile transmission over general telephone switched lines, a so-called protocol. In this regulation, the protocol is divided into five phases as shown below.

Phase A; call setup phase B; pre-message procedure phase C; mid-message procedure and message transmission phase D; post-message procedure phase E; call recovery However, in this regulation, communication is performed in group 3 (hereinafter referred to as G3) mode. In this case, even if a failure occurs on the receiving station side that makes it impossible to continue communication (for example, a recording paper jam) during image information reception (phase C), the receiving station will notify the transmitting station of the error. Information can be transmitted only after the transmitting station has finished transmitting the image information for one page of the original and the protocol has moved to the group D stage.

This means that after an error occurs at the receiving station, phase D
This means that the transmitting station is transmitting useless image information to a destination that cannot receive the information until it moves to the stage 2, which means that communication time is wasted.

[Purpose of the invention]

This invention was made in view of the above circumstances, and aims to provide a facsimile communication method that eliminates the above disadvantages and realizes high-speed and highly efficient facsimile communication without adding new hardware. do.

[Structure of the invention]

The present invention is applied to communications between a receiving station and a transmitting station that operate in group 2 (hereinafter referred to as G2) and G3 communication modes Mj. That is, in the present invention, on the receiving station side, for example, an appropriate sensor detects whether or not various functions of the receiving station are working normally, and during reception of a facsimile message in the G3 mode, the sensor is activated. For example, if it is determined based on the detection output that the function of the component is not working normally, the hand 11r interrupt signal (PIS) in the G2 mode is transmitted to the transmitting station to perform predetermined abnormality processing; Transmitting station 11
111, a method for immediately stopping the facsimile message transmission operation when the procedure interruption signal is received during the facsimile message transmission in the G3 mode will be described in detail with reference to an embodiment shown in the accompanying drawings.

FIG. 1 shows exemplary configurations of a receiving station and a transmitting station for carrying out the invention.

The receiving station 1O and the transmitting station 50 shown in FIG. Communicate via.

The receiving station 10 is equipped with a plurality of sensors 11, 12, . . . 1n, each of which is installed to detect a different operating state.

For example, the sensor 11 is a sensor for detecting a paper jam in recording paper, and the sensor 12 is a sensor for detecting a paper break in recording paper, and each detection output from these plurality of sensors 11, 12, . . . 1n is sent to the control unit 20. sent to. The control unit 20 is G
It is comprised of a 5G3 control unit 30 that performs communication control in 3 modes and a 5G2 control unit 40 that performs communication control in 02 mode. Normally, a facsimile machine that has both G2 and G3 mode functions has a control section that has two functions like this.
The controllers are divided into two controllers, which normally operate separately depending on the selected communication mode. Under the control of the control section 20, the reading section 45, the recording section 46, and the network control/modulation/demodulation section 47# are driven as appropriate.

Here, the 02 control unit 40 is equipped with a PIS sending circuit 41. The PIS detection circuit 41 is a circuit that is normally set as obcisin in 62 mode for sending out a PIS signal.

The PIS signal (procedure interruption signal) is a signal used in the CCITTG2 protocol, and has a frequency of 462Hz±1.5H.
A single tone of z will be transmitted for a minimum of 3 seconds.This signal can be applied in both directions, from the receiving station to the transmitting station and from the transmitting station to the receiving station, and its functions include (1) stopping the remote equipment; (2) There is a re-call of the operator.Therefore, by transmitting this PIS signal to the transmitting station 50, the receiving station IO can immediately stop the operation of the transmitting station 50. Similarly to the receiving station 10, the 03 control unit 70 and the G2 control unit 8
0, a reading section 85, and a recording section 8.
6 and a network control/modulation section 87. In this case, in particular, the 02 control section 80 has a PIS
A detection circuit 81 is provided. The PIS detection circuit is normally set as an option in the 02 mode for sending out the PIS signal.

This embodiment has such a configuration in order to realize the functions of the present invention without adding new hardware.

Next, the operation of the embodiment shown in FIG. 1 will be explained with reference to the flowchart shown in FIG.

2(a) is a flowchart of the receiving station 10, and FIG. 2(b) is a flowchart of the transmitting station 50.

The protocol has completed Phase A1 Phase B and the procedure has proceeded to Phase C.

Steps 100 and 110> After transmitting the training carrier wave, the transmitting station 50 starts transmitting the image information read from the document, that is, the facsimile message.

Steps 200 and 210> After receiving the training carrier wave sent by the transmitting station 50, the receiving station 10 starts an image information receiving operation and converts the transmitted image information into a hard copy.

Step 120> When the 03 control unit 70 of the transmitting station 50 starts transmitting the image information, it immediately transmits the P that may be sent from the receiving station IO.
In order to detect the IS signal, the PIS signal is sent to the 02 control unit 80.
Instructs to activate the detection circuit 81. As a result, the PIS detection circuit 81 of the 02 control unit 80 becomes active from now on.

Steps 130 and 14(1) After that, the transmitting station 50003 control unit 70 executes Steps 130 and 14(1).
Check to see if you have sent all the image information for one page.
When the transmission for one page is completed, an RTC signal indicating this is sent to the transmitting station IO, and the procedure then moves to phase D.

Steps 220 and 230> In step 220, the 03 control unit 30 of the receiving station IO
Check whether the C signal is also sent from the transmitting station 50,
If reception of an RTC signal is detected, the procedure then moves to Phase D. If the RTC signal cannot be detected in step 22θ, the procedure proceeds to step 230, and if the message carrier wave or image information is not received, the procedure proceeds to phase D, but if the message carrier wave is not received. If so, the procedure continues to step 240.

<Steps 240, 250, 260, 270> Here,
The receiving station 10003 control unit 30 has sensors 11, 12, . . .
・Check the 1n detection signal. If it is determined based on the detection output of the sensor that the facsimile machine can continue normal receiving operations, the procedure advances to step 210 and thereafter continues normal receiving operations. However, if it is determined based on the sensor output that normal reception operation cannot be continued due to a problem such as a paper jam, the 03 control unit 30
2. Instructs the control unit 40 to operate the PIS sending circuit 41. As a result, the PIS sending circuit 41 becomes active and sends a PIS signal to the transmitting station 50. after that,
03 control unit 30 displays an error code indicating the content of the failure on a display unit (1' in the figure), for example, and performs appropriate abnormality processing such as disconnecting the line.

Steps 150 and 160> Here, the transmitting station 500 PIS detection circuit 81 detects the receiving station 10
If no PIS signal is detected, the procedure proceeds to step 130, after which a normal facsimile transmission operation is executed. However, when the PIS detection circuit 81 detects the ps signal sent from the receiving station 10, the 02 control unit 80 notifies the 03 control unit of this fact. 03 control unit recognizes that the receiving station 10 is no longer able to continue normal receiving operations, and thereafter executes appropriate abnormality processing such as displaying an error and disconnecting the line.

As described above, according to this embodiment, by only slightly changing the facsimile communication procedure, it is possible to efficiently eliminate wasted transmission time caused by a failure during reception of image information at the receiving station.

Note that facsimile machines usually have a transceiver type configuration that includes a receiver and a transmitter. In such a case, the 02 control section may be provided with both a PIS detection circuit and a PXS transmission circuit, and the present invention may be realized from the two standpoints of a receiver and a transmitter.

Also, according to the G2 standard, the PI8 signal is required to transmit a single tone of 462 Hz for at least 3 seconds, but of course if it is possible to increase the detection capability of the PIS detection circuit, the above transmission method can be used. The time may be further reduced.

〔Effect of the invention〕

As explained above, according to the facsimile communication system according to the present invention, if a failure that makes communication impossible occurs at the receiving station during phase C, the communication operation is immediately stopped, resulting in unnecessary communication. It is possible to save time and realize highly efficient facsimile communication.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention, and FIG. 2 is a flowchart showing four operational examples shown in FIG. 911. l...Telephone line, 10...Receiving station, 11.12...
・in...sensor, 20, GO...control unit, 30
, 70... G3 control unit, 40, 80... G2 control unit, 41... PIS sending circuit, 50... Transmitting station, 8
1...PIS detection circuit. Figure 2 (0). (b) 389-

Claims (1)

[Claims] In a facsimile communication system between a receiving station and a transmitting station that has both Group 2 and Group 3 communication modes, detection detects a force/resultant force that allows the receiving station to continue normal receiving operations. means, and during the reception of a facsimile message in the group 3 mode, the receiving station power (if it is determined that it is impossible to continue normal reception operation), the said group Procedure interrupt signal (P
means for transmitting the IE) to the transmitting station and then causing the transmitting station to perform predetermined abnormality processing; Facsimile 1) A facsimile communication system characterized by comprising means for stopping message transmission and then performing predetermined abnormality processing.