JPS6360591B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a facsimile communication system, and more particularly to a system for realizing highly efficient facsimile communication at a transmitting/receiving station having both Group 2 and Group 3 communication modes.

[Prior art]

CCITT SGX Recommendation T30 specifies procedures for facsimile transmission of documents over general switched telephone lines, the so-called protocols. 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 message. 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 phase D.

This means that from the time an error occurs at the receiving station until the transition to Phase D, the transmitting station is transmitting useless image information to the other party that cannot receive it, and the communication time is It was a waste.

[Purpose of the invention]

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

[Structure of the invention]

This invention applies to Group 2 (hereinafter referred to as G2) and
This applies to communications between a receiving station and a transmitting station that have G3 communication mode. That is, in the present invention, the receiving station side detects whether various functions of the receiving station are working normally using, for example, an appropriate sensor, and detects whether or not the various functions of the receiving station are working normally during the reception of the facsimile message in the G3 mode. For example, if it is determined that a certain part of the function is not working properly based on the detection output of the sensor, a procedure interruption signal (PIS) in the G2 mode is transmitted to the transmitting station to perform predetermined abnormality processing. At the same time, when the transmitting station side receives the procedure interruption signal during the transmission of the facsimile message in the G3 mode, the transmitting station immediately stops the facsimile message transmission operation and performs predetermined abnormality processing. There is.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS The facsimile communication system according to the present invention will be described in detail below with reference to embodiments shown in the accompanying drawings.

FIG. 1 shows exemplary configurations of a receiving station and a transmitting station for implementing the present invention.

The receiving station 10 and the transmitting station 50 shown in FIG. Communicate via

The receiving station 10 includes a plurality of sensors 11, 12,...
1n, and each of these sensors is installed to detect a different operating state.
For example, the sensor 11 is a sensor for detecting a jam in recording paper, and the sensor 12 is a sensor for detecting a tear in recording paper.
Each detection output by 12...1n is sent to the control section 20. The control unit 20 performs communication control in G2 mode with G3 control unit 30 which performs communication control in G3 mode.
It is composed of a G2 control section 40. Normally, the control section of a facsimile device that has both G2 and G3 mode functions is functionally divided into two control sections, and these control sections are usually separated depending on the selected communication mode. Operate. Under the control of the control unit 20, the reading unit 45, the recording unit 46,
The network control/modulation unit 47 and the like are driven as appropriate.

Here, the G2 control section 40 is equipped with a PIS sending circuit 41. The PIS detection circuit 41 is a circuit that is normally set as an option in the G2 mode for sending out a PIS signal.

The PIS signal (procedure interruption signal) is a signal used in the CCITT G2 protocol, and is 462Hz ± 1.5Hz.
A single tone is 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) shutting down the remote equipment, and (2) calling back the operator. Therefore, by transmitting this PIS signal to the transmitting station 50, the receiving station 10 transmits the PIS signal to the transmitting station 50.
0 operation can be stopped immediately.

Next, the transmitting station 50 similarly to the receiving station 10,
A control section 60 consisting of a G3 control section 70 and a G2 control section 80, a reading section 85, a recording section 86, and a network control/control section 60;
This figure shows a facsimile device equipped with a modulation/demodulation section 87, and in this case, in particular, the G2 control section 80 is equipped with a PIS detection circuit 81. The PIS detection circuit is normally set as an option in G2 mode for sending out the PIS signal.

This embodiment has such a configuration for the purpose of realizing 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.

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

The protocol has completed Phase A, 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 G3 control unit 70 of the transmitting station 50 starts transmitting image information, it immediately sends a PIS detection command to the G2 control unit 80 in order to detect a PIS signal that may be sent from the receiving station 10. Instructs to activate the circuit 81. As a result, from now on, the G2 control unit 80
The PIS detection circuit 81 becomes active.

<Steps 130, 140> After this, the G3 control unit 70 of the transmitting station 50 checks whether all the image information for one page has been transmitted in step 130, and if the transmission for one page has been completed, the G3 control unit 70 of the transmitting station 50 An RTC signal indicating this is sent to 10, and the procedure then moves to phase D.

<Steps 220, 230> The G3 control unit 30 of the receiving station 10 performs steps 220 and 230.
Then, it is checked whether or not an RTC signal has been sent from the transmitting station 50, and if reception of an RTC signal is detected, the procedure then moves to Phase D. If no RTC signal is detected in step 220,
The procedure proceeds to step 230, where if the message carrier or image information is not received, the procedure proceeds to phase D, but if the message carrier is received, the procedure proceeds to step 240.
Proceed to.

<Steps 240, 250, 260, 270> Here, the G3 control section 30 of the receiving station 10 checks the detection signals of the sensors 11, 12, . . . 1n. If it is determined based on the detection output of the sensor that the facsimile device 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 failure such as a paper jam, the G3 control unit 30 sends a PIS signal to the G2 control unit 40. Instructs to activate the PIS sending circuit 41. As a result, the PIS sending circuit 4
1 becomes active and transmits a PIS signal to the transmitting station 50. Thereafter, the G3 control unit 30 displays, for example, an error code indicating the details of the failure on a display unit (not shown), and performs appropriate abnormality processing such as disconnecting the line.

<Steps 150 and 160> If the PIS detection circuit 81 of the transmitting station 50 does not detect a PIS signal from the receiving station 10, the procedure proceeds to step 130, and thereafter normal facsimile transmission operation is executed. However, PIS detection circuit 81
When the G2 control unit 80 detects a PIS signal sent from the receiving station 10, the G2 control unit 80 notifies the G3 control unit of this fact. This allows the G3 control unit to
recognizes that it is no longer possible to continue normal reception operations, and then performs 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 image information reception at the receiving station.

Note that facsimile devices usually have a transceiver-type configuration that includes a receiver and a transmitter. In such a case, the G2 control section should be equipped with both a PIS detection circuit and a PIS sending circuit, and the receiver,
The present invention may be implemented from two standpoints of the transmitter.

In addition, the PIS signal is supposed to transmit a single tone of 462Hz for at least 3 seconds according to the G2 standard.
Of course, the above transmission time may be further shortened if the detection ability of the PIS detection circuit can be increased.

〔Effect of the invention〕

As explained above, according to the facsimile communication system according to the present invention, if a failure occurs in the receiving station that makes communication impossible at the phase C stage,
Since the communication operation is immediately stopped, wasted communication time can be eliminated and highly efficient facsimile communication can be realized.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention;
FIG. 2 is a flowchart showing an example of the operation of the embodiment shown in FIG. 1...Telephone line, 10...Receiving station, 11, 12...1
n...sensor, 20,60...control unit, 30,70...
G3 control section, 40, 80...G2 control section, 41...PIS
Sending circuit, 50... transmitting station, 81... PIS detection circuit.

Claims (1)

[Claims] 1. In a facsimile communication system between a receiving station and a transmitting station having both Group 2 and Group 3 communication modes, a detection method is provided to the receiving station to detect whether or not the receiving station can continue normal receiving operations. and if it is determined that it is impossible for the receiving station to continue normal reception operation based on the output of the detecting means during reception of a facsimile message in the group 3 mode, the receiving station is in the group 2 mode. means for transmitting a procedure interruption signal (PIS) to the transmitting station and then causing the transmitting station to perform predetermined abnormality processing, the transmitting station transmitting the procedure interruption signal (PIS) during the transmission of the facsimile message in the group 3 mode. A facsimile communication system characterized by comprising means for immediately stopping the transmission of facsimile messages when a signal is received, and then for performing predetermined abnormality processing.