JPS63290030A - Data communication device - Google Patents

Abstract

PURPOSE:To enable the simultaneous operation of plural terminals, and to improve the use efficiency of a device by storing transmission data from the plural terminals, and transmitting them to a circuit after framing them. CONSTITUTION:The titled device is provided with the plural terminals to generate the transmission data, a storing means 61 to store the data from the plural terminals, a frame processing means 62 to frame the data, stored in the storing means 61, and a controlling means 64 to transmit the data, framed by the frame processing means 62. Thus, the simultaneous operation of the plural terminals comes possible, and the use efficiency of the device can be improved, and at the same time, the waste of communication time can be eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a data communication device that transmits and receives image data and character code data.

(Conventional technology) FIG. 1 shows an example of the configuration of a conventional facsimile machine.

1 is soda, 2 is memory, 3 is printer, 4 is main,
5 is an encoding/decoding circuit, 6 is a line control section, 7 is a control line, 8 to 12 are image data lines, and 13 is a packet switching network. The operation of this conventional general facsimile machine will be summarized.

When transmitting, activate reader 1 using main 4, and use soda 1.
The image data of the original read photoelectrically is stored in the memory 2 through the data line 8.

This is read out under the control of the main 4, passed through the main 4 through the data line 10, and further encoded from the data line 11 in the encoding/decoding circuit 5 by activation from the control line 7. The encoded data passes through the data line 12 and is stored in the transmission buffer of the line control section 6.

The line control unit 6 adds a header to this buffer data based on the parameters input from the control line 7, and transmits it to the line 13 as one frame with an appropriate data length.

Beyond this is a circuit terminating device (abbreviated as DCE) which is a connection device to the digital switching network, and is connected to the other device through the switching network.

At the time of reception, the image data input from the line 13 is stored in the reception buffer of the line control unit 6. The line control unit 6 notifies the main 4 of data reception through the control line 7,
This activates the encoding/decoding circuit 5 to decode the encoded image data received through the data line 12, pass it through the main 4 via the data line 11, and write it into the memory 2 from the data line 10. When an appropriate amount of image data is stored in the memory 2, the printer 3 is activated from the control line 7, the image data is output to the printer through the data line 9, and the image is recorded and reproduced on the recording material by the printer 3.

However, since this type of conventional device had one reader function and one printer function per terminal, it was not possible to simultaneously receive data from or send data to multiple subscribers. Furthermore, even if the line speed is fast, if it happens to be receiving data, it is necessary to wait until the receiving process is finished, so even if the line speed is high, it is not fully utilized.

[Objective] The present invention eliminates the drawbacks of the prior art described above, and also provides an economical and optimal data communication device by simultaneously controlling a plurality of terminals that generate transmission data or a plurality of terminals that output reception data. The purpose is to provide

(Example) The present invention will be explained below based on preferred embodiments.

FIG. 2-1 is a block diagram showing an embodiment of a facsimile apparatus to which the present invention is applied, in which 20 is a reader A, 21 is an image data line A, 22 is a reader N, 23 is an image data line N, 3
0 indicates the image data line a for the printer A 131, and 32 indicates the image data line n for the printer N 133. Also, 2 is a memory, 4 is a main, 5 is an encoding/decoding circuit, 6 is a line control section, 7 is a control line, 10 to 12 are image data lines, 1
3 is a packet switching network.

FIG. 2-2 is a block diagram showing details of the line control section 6 of FIG. 2-1. 61 is a transmission code page memory for storing the data encoded by the encoding/decoding circuit 5 and transmitting it to the reader 8'.
Each of the sodas from No. 20 to N22 is stored in a predetermined memory area. Reference numeral 62 denotes a frame processing unit, which adds a header as shown in FIG. 6 to the data stored in the transmission code page memory 61 according to the parameters input from the control line 7, and processes data of an appropriate length into one frame. It is something to create. Reference numeral 63 denotes a transmission buffer for storing frame data created by the frame creation section 62. Reference numeral 64 denotes a transmission/reception control unit which sends frame data stored in the transmission buffer 63 to the packet switching network 13 and sends data sent from the packet switching network 13 to the reception buffer 65. The transmission/reception control section 64 controls the control line 7 and performs connection control such as setting up or disconnecting a call.

65 is a reception buffer that stores frame data sent from the transmission/reception control unit 64.
f Received frame processing gβ rearranges the frame data stored in the reception nozzle 65 for each printer in the order in which they were sent from the packet switching network 13. Reference numeral 67 denotes a received code page memory, which stores frame data sent from the received frame 66 in respective designated areas of the printer.

First, let's start with the logical channel group (
) and a logical channel (abbreviated as LCN).

), in the current Japanese public packet switching network, LCGNs are defined as 0 to 1 and LCNs as 1 to 31, and each LCN is defined for one LCGN. Since calls can be set up for each LCN channel, by having multiple LCNs for one terminal, that is, one facsimile machine, communication with multiple destinations can be performed simultaneously. Roughly, LCGN can be used to divide reception-only and transmission-only groups, so for example, L
Define CGNO as a reader for sending only, LCGN 1 as a printer for receiving only, reader A20 as LCN 1, reader N22 as LCN2, and printer A30 as LCNl.
, printer N32 can be LCN2.

Figure 3 is an example of a table provided in main 4, where 40 is L
CGN status, 41 is LCGNO status,
42 is the status of LCGN 1.

In addition, MSB is Mo5t 51gn1ficant
Bit, LSB is Least 51gn1fica
nt Bit.

Assuming two readers and two printers, 43 in the table in Figure 3 indicates LCGNO, and 44 indicates LCGNI.
If the sending only is "0'°" and the receiving only is "1°", it is 43
is 0", and 44 is "1". Also, status 41.4 is "1".
Regarding 2, only the locations where the reader and printer are connected are set to "1". That is, LS with status 41.42
Starting from B, we will associate one reader and one printer with each LCN, and in the case of two each, the number will be 41.
is 0...011'', and 42 is also O...011°'. The settings in this table are initialized in accordance with the configurations of the reader and printer when setting up this facsimile machine.

In this case, the facsimile machine is LCGNO, then LCNI,
2 for sending only, and LCN 1.2 of LCGN1 for receiving only.

Therefore, when sending a document from reader A20, for example, LCGNO
When setting up a call and transmitting an image using LCN 2, if there is a reception, it is sent to LCN 1 of
By assigning it to CN 1, calls can be received from the network. By doing this, take LCN2 of LCGNO,
Since LCN 1 of CGNI can operate independently, it can be transmitted from reader A20 and received by printer A30. Furthermore, even if there is another incoming call at the same time, since LCN2 of LCGNI is vacant, the incoming call is assigned to this, and the printer A30 can also receive the call at the same time.

A data flow diagram during multi-control at this time is shown in No. 41.

In FIG. 4, 60 indicates a data flow.

Note that the table in the third section can be specified by inputting it using the keys on the software when setting up the system, or by inputting it using the switch 83 without using the main memory as shown in Fig. 5.
If you make each LCGN and LCN correspond to each other, and set the transmit-only to "0" and the receive-only to "1" and turn the switch 83 on and off accordingly, this can be connected to the pull-up resistor 8.
It is also possible to turn on the buffer gate 81 via the data bus 80 and sell its state to the microprocessor 8 through the data bus 80.The reference 84 is the ground line.When the number of bits is insufficient, , LCGNO using multiple switches
, LCGNI may be used separately.

Next, the case where data is transmitted using the facsimile machine shown in FIG. 2 will be explained.

First, when a document is set on the reader 20, the line number of the other device is entered, and the start button is pressed, it is determined which LCGN or LCN the reader A 20 should correspond to, based on the table shown in FIG. For example, let LCGN be 0 and LCN be 1. Next, a calling packet (CR) is sent from the transmission/reception control unit 64 to the packet switching network 13 according to the calling procedure of the packet switching network (FIG. 7). Call packet (CR) at this time
is shown in Figure 6. F is a synchronization pattern that synchronizes data using flags, A is a command indicating that data is being sent from a packet terminal, ■ is an information parameter indicating that a parameter follows, and G
FI indicates a general format identifier.

Next, LCGN, LCN (LCGN and LCN contain 0 and 1 corresponding to the aforementioned radar A20), and then C which indicates that this data is a calling packet (CR).
The R parameter is followed by the line number of the called side to which the original will be sent, the line number of the calling side, etc.

In a packet switching network, when this calling packet is received, the destination is confirmed based on the line number of the called side, and the LCGN, which is not currently in use, is assigned to the other party's terminal.

Select an LCN and send an incoming call packet (CN) to notify that there is an incoming call. If the other terminal is terminal B as shown in FIG. 7, an incoming call packet (CR) is transmitted to terminal B. Here, the empty channel of terminal B is LCGN=1. L.C.
If N = 2, subsequent packets will be sent and received by calling terminal A.
LCGN=O, LCN=1 and LCGN of called terminal B
This is done by connecting LCN=1 and LCN=2. Terminal B receives the incoming call packet (CR) and confirms that the printer can be activated, and then returns the same LCGN as the incoming call packet (LCGN=1.
Returns an incoming call acceptance packet (CA) with LCN=2. In the packet-switched network, terminal B receives the CA packet, determines that the connection has ended, and returns a connection completion packet (CC) to terminal A. At this time, the LCGN and LCN of the CC are the calling packet (
CR) are each 0.1.

This completes the connection at the network layer, and the reader A20 of terminal A and the printer of terminal A have a one-to-one correspondence.

Then, the LCGN of the DT packet including image data to be exchanged between terminal A and the switching network in the future.

The LCN is the same as the value of the CR packet, and the LCGN and LCN of the DT packet, which also includes image data exchanged between the exchange tbx and terminal B, are the same as the value of the CN packet. Next, when the transmission of the image data is completed, terminal A sends a recovery request packet (CQ) to the switching network. Furthermore, the switching network sends a disconnection instruction packet (CI) to terminal B, and terminal B recognizes that the disconnection instruction has arrived, and the LCGN at this time,
Since the LCN indicates a previously connected printer, a process is started to end its use. Then, after confirming the processing, a disconnection confirmation packet (CF) is sent to the switching network. Thereafter, a recovery confirmation packet (CF) is sent to terminal A again, the transmitting side reader A20 is completely returned to its initial state, the network is disconnected, and all transmissions are completed. The flow at this time is shown in Figure 8-1.

Here, if you want to send another data to terminal B from reader N22 of terminal A while it is being sent to the printer of terminal B using reader A20 of terminal A, LCGN=
Data overconfidence can be achieved by associating O and LCN=2 and associating another empty printer of terminal B with LCGN=1 and LCN=1. In other words, in FIG. 8(a),
802 Waiting for reception of connection completion packet (CC), 803
Waiting for image data transmission, 804 recovery confirmation packet (C
F) When the reception waiting interrupt is enabled, the transmission/reception control unit 64 sends out a calling packet and sets up a call. When the call is set, it is framed in advance by the transmission frame processing unit under the control of the main 4 and sent to the transmission buffer 63. The data stored in is sent to the packet switching network 13. Furthermore, this reader N2
A connection completion packet (CC
), or when waiting for the transmission of image data, etc., an interrupt can be made, and at this time, the continuation of the image data stored in the transmission buffer 63 or read from the data reader A20 is transmitted.

By repeating this, the data stored in the transmission buffer 63 and read and framed by the readers A2Q and N22 can be transmitted in a time-division manner, and the line can be used effectively.

In addition, each frame data includes LCGN=O, LCN=1 indicating the reader A20, and LC indicating the leader N22.
Since GN=O and LCN=2 are attached, the packet switching network can identify which reader the data is from.

Next, a case will be described in which a call is received from another terminal C while the terminal A is transmitting to the terminal B. Figure 8-1 shows the L
This is a flow for transmitting data to the printer of terminal B using reader A20 with CGN=O and LCN=1. Here, as described above, interrupts are possible at 802, 803, and 804, and at this time, an incoming call packet (CN) sent from the packet switching network 13 is received.

In this CN packet, LCGN=1. If LCN=2 is attached, the printer N32 is activated according to the table in FIG. 3, and the incoming call acceptance packet (C
A) is sent. When a call is set up, image data (DT packets) are received. The transmitted image data is temporarily stored in a reception buffer 65 and stored in a predetermined area of a reception code page memory 67 via a reception frame processing section 66. The flow of reception from terminal C to terminal A is shown in Figure 8-2. In this flow, there is a data reception wait 810, a disconnection instruction packet (CI) reception wait 8
11 allows interrupts, and 8 interrupted in Figure 8-1.
Continue from step 02, 803 or 804.

Here, even when interrupting each other, each packet always has its own LCGN.

An LCN is added so that it is possible to identify which process is being performed. In other words, LCGN=O.

If LCN=1, the process is to send the document from reader A20 to terminal B, and if LCGN=1. If LCN=2, the process is to output an image to printer B upon reception from terminal C.

Further, when data from a plurality of terminals is sent to terminal A from the packet switching network 13, the transmission/reception control section 64 first sets up a call. Then, the image data sent in a time-division manner is stored in the reception buffer 65, and each frame data is stored in the reception code page memory 67 based on LCGN and LCNe determined at the time of call setup. This stored data is stored in different areas depending on which printer is used to output the data, and after being decoded by the encoding/decoding circuit 5, it is stored again in the memory 2 for each printer, and is output to each printer. Images can be output to.

The simultaneous transmission and reception operations described above are carried out by the line control unit 6 of the terminal.
, encoder/decoder circuit 5, etc. are required to have high processing performance, and a multi-programming system is used for the main 4.

Further, if the terminal A in the above-mentioned embodiment has a line speed of, for example, 48 kbps and the other party has a line speed of 9.6 kbps, it can simultaneously process communications with five other parties.

For example, it is possible to send a document using three readers and receive the document using two printers. They are all L
Since the combination of CGN and LCN is different, it can operate uniquely and distinctly from other processes without duplication.

In addition, even if the other party has the same line speed, reading from the reader, encoding, output to the printer, etc. are performed under the control of the main 4, so as soon as communication is completed, it is immediately converted into a frame and sent. Data stored in the buffer 64 can be transmitted or received into the reception buffer 65.

As explained above, according to the above embodiment, LCGN and L
By defining multiple readers and printers that are compatible with CN and do not have sending/receiving functions, it is possible to duplicate sending/receiving or to perform simultaneous operations, which improves device usage efficiency and eliminates wasted communication time. can.

Note that the present invention is not limited to image processing devices that can be connected to the main body, such as printers and printers, and it is also possible to connect other image processing devices such as word processors and workstations.

Further, the present invention is not limited to the above-mentioned embodiments, and various modifications can be made within the scope of the claims.

[Effects] As explained above, by using the present invention, it is possible to operate a plurality of terminals simultaneously, and it is possible to improve the utilization efficiency of the device.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing an example of the configuration of a conventional facsimile machine, Fig. 2-1 is a block diagram showing an embodiment of a facsimile machine to which the present invention is applied, and Fig. 2-2 shows the line of Fig. 2-1. A block diagram showing details of the control unit 6, FIG. 3 is an LCG
FIG. 4 is a data flow diagram; FIG. 5 is a diagram showing switch inputs in place of the table in FIG. 3; FIG. 6 is an example of a calling packet (CR). 7 is a diagram showing a control procedure in a packet switching network, FIG. 8-1 is a flowchart showing control during data transmission, and FIG. 8-2 is a flowchart showing control during data reception. 1.20.22 beamer, 2 is memory, 3°30.32
is a printer, 4 is a main unit, 5 is an encoding/decoding unit, 6 is a line control unit, 13 is a line, 61 is a transmission code page memory,
62 is a transmission frame, 63 is a transmission buffer, 64 is a transmission/reception control section, 65 is a reception buffer, 66 is a reception frame processing section, and 67 is a reception code page memory.

Claims (3)

[Claims] (1) A plurality of terminals that generate transmission data, a storage means that stores data from the plurality of terminals, a frame processing means that frames the data stored in the storage means, and a frame processed by the frame processing means. 1. A data communication device comprising: control means for transmitting encoded data to a line. (2) a plurality of terminals that output received data, means for setting an identification number to each of the plurality of terminals, a control means for receiving data sent from a line, and a control means for receiving data received by the control means; A data communication device comprising: a means for decoding; a storage means for storing the decrypted data; and a means for outputting the data stored in the storage means through a line to a terminal having a designated identification number. . (3) multiple input terminals for inputting transmission data;
It has a plurality of output terminals for outputting received data, and a storage means for storing transmission data inputted from the plurality of input terminals or reception data to be output to the plurality of output terminals, and the storage means stores the transmission data inputted from the plurality of input terminals or the reception data outputted to the plurality of output terminals. A data communication device characterized in that transmission data sent via a frame is sent to a line, and received data sent from the line is decoded and output to the storage means.