JP3389699B2 - Facsimile machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facsimile machine, and more particularly to a facsimile machine for controlling transmission / reception of commands without waste.

[0002]

2. Description of the Related Art In recent years, ITU-T Recommendation T. 30 ANN
A new communication protocol (hereinafter referred to as G3C protocol) is recommended by EXC. The G3C protocol is proposed as a combination of the ideas of the G3 protocol and the G4 protocol. According to the above-mentioned recommendation, in the control of transmission and reception of the command of the G3C protocol, three multiframes each including a plurality of commands as one unit are set as one unit, and at the time of command transmission, three multiframes are set.
It is necessary to continuously transmit the multi-frames.

For example, as shown in FIG. 8, first, a sending side sends an appendix signal (XID) command to the receiving side to start facsimile communication. Next, the XID command, non-standard function signal (hereinafter, NSF) command, called terminal identification signal (hereinafter, CSI) command,
And a digital identification signal (hereinafter referred to as DIS) command are combined into one multiframe {XID,
(NSF), (CSI), DIS} is sent from the receiving side to the transmitting side. According to the recommendation, the multiframes are transmitted in sets of three.

In FIG. 8, these three multiframes have at least one error in the commands (3 × 4 = 12) among them, and the response command from the transmitting side is sent out. Since it is not performed, the case where three multi-frames are sent to the transmission side again is shown. Since there is no error in the first multiframe of the three retransmitted multiframes, a transmission terminal identification signal (hereinafter, TSI) and a digital command signal are sent as a response command from the transmission side to this multiframe. (Hereinafter, DCS) is transmitted. In addition, since there is no error in the second and third multiframes, (TS
I) DCS is being sent out. Then, when the transmission of the predetermined response command is completed, the frame of the facsimile encoded data (hereinafter, FCD) is transmitted to the receiving side.

The prior art relating to the G3C protocol is described in the ITU-T Recommendation T.264. Although it is considered that there is not any other than 30, there is a technique described in Japanese Patent Laid-Open No. 5-219335, which is related to the technique of continuously sending the same command. In this publication, in the communication processing procedure of the facsimile apparatus, RCP frame or PP is used.
A technique is disclosed in which three S-EOP commands and the like are continuously transmitted.

[0006]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
The technology disclosed in Japanese Patent No. 335 is RCP or PPS-EOP.
No more than showing that three commands are output consecutively,
It has nothing to do with the G3C protocol. As described above, the protocol procedure of the G3C protocol is G
It is based on 3 protocols. Therefore, if it is attempted to realize the G3C protocol by using the control installed in the G3 facsimile apparatus or by changing the design of the control, the concept of continuously transmitting or receiving three same multiframes in the G3 protocol Therefore, there was a problem that the G3C protocol could not be run.

Further, once the continuous transmission of multi-frames is started, even if the response command is returned, three multi-frames must be transmitted, and useless command transmission must be performed. . Also,
The facsimile machine on the receiving side receives three identical multi-frames. However, in the conventional control method, if one of the commands in the multi-frame contains an FCS error, the three multi-frames are received. There is a problem that the frame cannot be judged to be normal. SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned problems of the prior art, and to provide a facsimile apparatus capable of efficiently transmitting a plurality of commands and receiving a plurality of commands.

[0008]

In order to achieve the above-mentioned object, the invention of claim 1 is to provide a generation means for generating a command and a transmission frequency control means for controlling the transmission frequency of a multi-frame having the command as an element. And a sending means that is controlled by the sending number control means and continuously sends multi-frames for the number of sending times, and while sending the multi-frames,
It is characterized in that it comprises a receiving means for receiving the command sent from the transmission partner and a means for stopping the sending of the command when it is judged that the response command is received by the receiving means. Further, the invention of claim 2 is characterized in that it comprises a judging means for judging whether or not the response command from the transmission partner is normally received. Further, claim 3
The invention of 1 is characterized in that it has a storage means for storing only one normal command when a plurality of same commands are received.

[0009]

According to the first aspect of the invention, when the command for the number of times of transmission is transmitted as a multiframe and the response command from the transmission partner is received in response to the command, all the commands for the number of times of transmission are not transmitted. Can also stop sending commands.

According to the second aspect of the invention, even if some of the received plurality of commands have FCS errors, if at least one normal command is received,
It becomes possible to judge that the command is normally received. Further, according to the invention of claim 3, when a plurality of the same commands are received, only one normal command can be stored.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the facsimile apparatus of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a block diagram showing the function of one embodiment of the present invention. In the figure,
Reference numeral 1 is a control unit for controlling a facsimile apparatus according to the communication control procedure of the G3C protocol, 2 is a command generation unit for generating a command under the control of the control unit 1, 3
Is a transmission unit for transmitting the command generated by the command generation unit 1 to the facsimile machine on the other side, and 4 is a command transmission frequency set using the operation display device 13 or the like, which will be described later. Is a transmission number control unit for counting, for example, a counter. 6
Is a receiving unit that can receive commands sent from the other party while sending commands, and can receive multiple commands,
Reference numeral 7 is an error check unit that checks whether the command is normally received, and 8 is a storage unit that stores only one command that is normally received when the same command is continuously received.

FIG. 2 is a block diagram showing a schematic configuration of a facsimile apparatus to which the present invention is applied. In the figure,
Reference numeral 11 is a CPU for controlling the entire facsimile machine, and 12 is an RA as a work area used by a control program.
M and 13 are operation and display devices for the operator to operate the facsimile device, 14 is a reading device for reading transmission originals, copying originals, and the like, 15 is a printing device for recording the copying originals, received images, and the like, and 16 is An image processing device that encodes, decodes, or expands or contracts image signals, 17
Is an image storage device for storing image information, and 18 is the CPU 1
Reference numeral 1 is a system control unit in which a program for controlling the entire facsimile apparatus is stored, 19 is a digital communication control apparatus for controlling communication suitable for a digital network, and 20 is an analog for controlling communication suitable for an analog network. It is a communication control device and has an automatic call origination / termination function. Reference numeral 21 is a digital network interface for connecting a facsimile machine and a digital network, 22 is a modulator / demodulator having a function of switching between a low speed mode function and a high speed mode function, 23 is an analog network interface for connecting the facsimile machine and an analog network, 24 Is a system bus for exchanging data with each other, and 25 is a line switching control device for connecting an external line interface such as the digital network interface 21 and the analog network interface 23 to a plurality of internal communication circuits.

Next, the operation of sending a plurality of commands as a multi-frame in the facsimile apparatus of this embodiment will be described with reference to the drawings. Figure 3 shows XID,
It is a flowchart which shows an example of transmission of the multi-frame command which consists of (NSF), (CSI), and DIS.
FIG. 7 is a diagram showing transmission and reception of commands. First, in step S1, a multi-frame command to be sent is created and stored in the work area of the command generator 2. In step S2, the command transmission count of the multi-frame command to be transmitted is set in the transmission count control unit 4 (hereinafter referred to as a counter). In step S3, the multi-frame command stored in the work area of the command creating section 2 is sent out. In step S4, the counter 4 is decremented each time one multi-frame command is transmitted.

In step S5, it is determined whether or not the counter 4 is zero. If this determination is affirmative, it is determined that the multi-frame command has been transmitted the number of times the command has been transmitted, and the transmission of the multi-frame command ends. On the other hand, if the determination is negative, the process proceeds to step S6. In step S6, it is determined whether or not a response command (that is, a DCS command) for the multi-frame command has been received. If this determination is affirmative, the multi-frame command has been correctly received on the receiving side, so the transmission of the remaining multi-frame commands is canceled and the process ends. At this time, the counter 4 is cleared. On the other hand, when the determination is negative, the process returns to step S3, and the multi-frame command is sent again from the work area.

As described above, even when a plurality of commands are continuously transmitted, when a response command is transmitted from the transmitting side for one normal command, a plurality of subsequent commands are transmitted. Continuous delivery can be stopped. For example, when three multiframe commands are continuously transmitted, when the response command from the receiving side for the first multiframe command transmitted is received, the transmission of the second and subsequent multiframe commands is stopped. Can be made. The example above is X
Although the transmission of the multi-frame command including the ID, (NSF), (CSI), and DIS has been described, the same can be performed for other commands. According to the present embodiment, for example, as shown in FIG. 7, it is possible to suppress the transmission of the multi-frame command to two, and it is possible to shorten the time required for transmitting and receiving the command.

Next, the operation of the facsimile apparatus of this embodiment for receiving a plurality of commands sent as a multi-frame will be described with reference to the drawings. 4 and 5 are flowcharts showing an example of receiving a multi-frame command. FIG. 6 is an explanatory diagram of the received multi-frame command. First, in step S11, it is determined whether a multi-frame command has been received.
If this determination is affirmative, the process proceeds to step S12, and the received command is stored in the work area of the command creating section 2. Here, the command a of the multi-frame command 1 shown in FIG. 6 is stored in the work area.

In step S13, it is determined whether or not the reception of the multi-frame command is completed. If this determination is affirmative, the process proceeds to step S14, and "1" is set in the counter n or register not shown. On the other hand, when the result is negative, the process returns to step S12. In step S15, the n-th command of the multi-frame command stored in the work area is extracted. Here, the command a of the multi-frame command 1 is extracted. In step S16, the FCS check of the extracted n-th command is performed, and it is determined whether the command has been normally received. When this determination is affirmative, the process proceeds to step S17, and it is determined whether or not the command is the same as the previous command. On the other hand, if the result is negative, the process proceeds to step S19 to clear the command in the work area.
That is, the error command is cleared. Here, the command a is normally received as shown in FIG. If the determination in step S17 is affirmative, step S
In step 19, the command in the work area is cleared. On the other hand, in the case of negative, the processing proceeds to step S18,
The command is moved to the reception buffer (not shown). Here, the command a is moved to the reception buffer.

In step S20 of FIG. 5, it is determined whether or not there is a next command. If this decision is positive,
The process proceeds to step S22, the n is incremented, and the process returns to step S15. On the other hand, if the result is negative, the process proceeds to step S21 and the multi-frame command is set to 3
It is judged whether or not it has been received twice. If this determination is negative, the process returns to step S11, while if the determination is affirmative,
finish. As described above, by sequentially processing the commands a to c of the multi-frames 1 to 3 shown in FIG. 6, it is possible to obtain a plurality of normally received commands one by one. As a result, according to the present embodiment,
If at least one of the correct commands a, b, and c is included in the multiframe commands 1 to 3, it is determined that the commands a, b, and c included in the multiframe have been correctly received, and the response command is sent. You will be able to.
Therefore, it is possible to reduce the operation of retransmitting three multiframes as in the related art, reduce the protocol reception time, and reduce the load on the CPU.

The G3 protocol has been described above, but the G3 protocol is not limited to this protocol, and any protocol that performs the same operation is applicable.

[0020]

As is apparent from the above description, according to the invention of claim 1, when the command for the number of times of transmission is transmitted as a multi-frame and the response command from the transmission partner is received in response to the command, It is possible to stop the command transmission without transmitting all the commands for the number of times of transmission. Therefore, it is possible to reduce the time required to send and receive the command, and it is possible to efficiently use the facsimile device. Further, according to the invention of claim 2, even if some of the received plurality of commands have FCS errors, if only one normal command is received,
It can be determined that the command has been normally received.
For this reason, it is not necessary to uselessly make a command retransmission request. Further, according to the invention of claim 3, when a plurality of the same commands are received, only one normal command is stored, so that only the received normal command can be stored in the work area, and an extra command is stored. You don't have to remember.

[Brief description of drawings]

FIG. 1 is a block diagram showing functions of an embodiment of the present invention.

FIG. 2 is a block diagram showing a schematic configuration of a facsimile machine to which the present invention is applied.

FIG. 3 is a flowchart showing an example of sending a multi-frame command.

FIG. 4 is a flowchart showing an example of receiving a multi-frame command.

FIG. 5 is a flowchart continued from FIG. 4;

FIG. 6 is an explanatory diagram of a received multi-frame command.

FIG. 7 is an explanatory diagram showing command transmission / reception.

FIG. 8 is an explanatory diagram showing transmission and reception of a conventional command.

[Explanation of symbols]

1 ... Control unit, 2 ... Command generating unit, 3 ... Sending unit, 4 ... Sending frequency control unit, 6 ... Receiving unit, 7 ... Error checking unit, 8
... storage unit, 11 ... CPU, 12 ... RAM, 13 ... operation display device, 14 ... reading device, 15 ... printing device, 16 ... image processing device, 17 ... image storage device, 18 ... system control unit, 19 ... digital communication Control device, 20 ... Analog communication control device, 21 ... Digital network interface, 22 ...
Modulator / demodulator, 23 ... Analog network interface, 24
... system bus, 25 ... line switching control device.

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-3-68262 (JP, A) JP-A-3-42966 (JP, A) JP-A-5-114987 (JP, A) JP-A-3- 219765 (JP, A) JP-A-3-184450 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) H04N 1/32-1/36 H04N 1/42-1/44

Claims (3)

(57) [Claims] 1. In a facsimile apparatus of a communication control procedure system for transmitting and receiving a multi-frame including a plurality of commands as a set, a generation unit for generating a command and a number of times of transmitting the multi-frame having the command as an element are controlled. A sending count control means, a sending means that is controlled by the sending count control means, continuously sends the multi-frame for the sending count, and receives a command sent from a sending party while sending the multi frame. It comprises a receiving means and a means for stopping the sending of the command when the receiving means judges that the response command has been received. The facsimile apparatus is characterized in that the sending of the command is stopped without sending all the commands. 2. A determination means for determining whether or not a response command from a transmission partner has been normally received, wherein if at least one of the received commands is normal, the response command is sent. 2. The facsimile apparatus according to claim 1, wherein it is determined that the command is normally received. 3. The facsimile apparatus according to claim 2, further comprising storage means for storing only one normal command when a plurality of same commands are received.