JPS63187840A - Communication control equipment - Google Patents

Abstract

PURPOSE:To attain at least two different communication control processings with a simple control procedure by providing a means applying 1st and 2nd communication procedures and a control means executing selectively the said communication procedure based on a request signal from an external device, and using the same control procedure of a signal transmitted/received to/from the external device independently of the communication procedure. CONSTITUTION:A T30 procedure, a Just-pc procedure, a procedure with an external device 7 and each program for coding/decoding in addition to a control program of a CPU 4 are stored in a ROM 3 of a communication control section 1. Through the constitution above, the external device 7 and a CPU 4 apply RS hand-shake to control the communication procedure. In such a case, when an operation mode setting command from the device 7 is a FAXE, a FAX mode flag is set to execute the FAX quick transmission procedure. Moreover, when the said LMD command is in the mode of the Just-pc procedure, while the same procedure as at the said FAX transmission is executed between the device 7 and the communication control section 1, the Just-pc procedure is conducted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a communication control device that controls communication of data such as character code data or image data.

[Conventional example]

In recent years, a single communication control device has been provided with functions for two communication procedures: a facsimile communication procedure and a data communication procedure such as personal computer communication, and a personal computer (host) is connected to this communication control device to enable communication between personal computers. Efforts are being made to enable communication between personal computers and facsimile machines, or between personal computers and facsimile machines.

However, when controlling the operation of a communication control device from a personal computer (host), the personal computer is provided with different control procedures for facsimile communication and personal computer communication. Therefore, there is a drawback that the control procedure of the personal computer becomes complicated.

〔the purpose〕

An object of the present invention is to provide a communication control device that eliminates the drawbacks of the conventional example described above and performs at least two different types of communication control using simple control procedures. One embodiment will be described in detail.

In addition, in this embodiment, CCTTT of the facsimile communication procedure
Recommendation T, 30 procedures and PC communication procedure Just
An example of a telephone that can perform PC procedures (which can also be used for word processing) will be explained.

FIG. 1 is a block diagram showing the configuration of a telephone having a communication control function according to this embodiment.

In FIG. 1, l is a communication control unit that controls communication procedures and calls.

Reference numeral 2 denotes an R3232C interface section for connecting an external device 7 (for example, a personal computer or a word processor) to the communication control section 1.

3 is a read-only memory (ROM) that stores a control program for the CPU 4;

30 procedure programs, a Just-PC procedure program, a procedure program with the external device 7, an encoding and decoding program, and a program for controlling the communication control unit 1 are stored. The encoding/decoding method of this embodiment is, for example, the modified Huffman method (M H
method), modified read method (MR method), modified modified read method (MMR method), etc.

4 is a CPU that controls the communication control section 1;

A modem 5 modulates and demodulates code data, image signals, and procedure signals.

Reference numeral 6 denotes a network control unit (NCU) that acquires and releases the line 8 and switches the connection between the calling side and the communication side of the line 8.

9 is a speech network unit for controlling calls.

10 is a handset for making calls.

With the above configuration, in this embodiment, the external device 7 (hereinafter referred to as host) and the CPU 4 perform RS handshake, control the communication procedure based on the RS handshake, and control communication of code data or image data with the communication partner. I do.

FIG. 2 is a diagram showing a sequence example of a three-wire handshake procedure in the Just-pc procedure.

For 3-wire handshake, control code ENQ (05)
() and ノ~CK (06H) are used.

When the data arrives at the communication control device, the communication control device sends an ENQ to the host (1).

A CK because the host is busy and cannot accept data.
does not return (2).

The communication control device waits for 2 seconds for an ACK to be returned, and when the time has elapsed, sends an ENQ again (3).

If the host is ready to accept the second ENQ request from the communication control device, it will return an ACK (
4).

After receiving the ACK, the communication control device immediately sends the data to the host (6).

If both the communication control device and the host send ENQ at the same time (7, 8), the host side has the upper hand.

That is, after sending an ENQ, the host receives and accepts the ENQ from the communication control device, but does not receive it and waits for an ACK from the communication control device.

The communication control device receives ENQ from the host and sends ACK
(9).

The host sends data upon receiving the ACK from the communication control device (10).

The above is the three-wire handshake procedure in Just-PC, and data is transmitted and received between the host and the communication control device using this procedure not only when communicating with a personal computer but also when transmitting a FAX.

Next, FIG. 3 is a diagram showing an example of a sequence when data from a host is transmitted to a facsimile machine by the communication control unit 1 of this embodiment.

This will be explained below based on FIG.

First, when an operating mode setting (LMD) command is received from the host, the parameters of the LMD command are analyzed. The parameters of this LMD command include the type of media of the other party's device (for example, whether the other party is a facsimile or a personal computer), the telephone number of the own station, and a user ID indicating the name of the user. If the media type parameter MOD of the MD command is O, the communication partner is a Just-PC procedure communication device, and if MOD is 1, the communication partner is a T, 30 procedure facsimile device.
PU4 makes the determination. In this case, since the other party is a facsimile machine, MOD is set to 1.

Next, upon receiving the LMD code, the CPU 4 returns a local response (Lr2S) to the host side via the R3232C interface section 2. Then, based on the identification result of the LMD command, in this case, the process proceeds to the facsimile mode procedure routine to perform procedure T, 30.

Next, when the CPU 4 receives a call command and the other party's telephone number data (CNR) from the host, the NCU 61:1m seizes the line, and the auto dial section (not shown) of the NCU 6 makes a call to the telephone line network. do. When it detects that the line is connected to the other party, it sends a connection confirmation (RNC) command to the host side, and then sends a calling tone (CNG) to the facsimile machine of the other party.

Next, when the CPU 4 receives a digital identification signal (DIS) from the other party's facsimile machine side, it sends a called terminal identification confirmation signal (LRA) to the host side. This LRA consists of seven parameters as shown in Fig. 5, and these parameters are set by analyzing the DIS from the facsimile side.The seven parameters of LRA are as follows:
Encoding method (for example, when TYP is 0, when MHSTYP is 1, it indicates that the other party has MW and MR)
, recording width (up to A4 when HRZ is 0, up to B4 when HRZ is 1, up to A3 when HRZ is 2), recording length (
A4 when VER is 0, unlimited when VER is 1, VE
A4 and B4 when R is 2), modem type (V when MDM is 0, 27terfa'11., V, 27ter when MDM is 1, V, 27ter when MDM is 3), V, 29), resolution (only 3.8517 mm when DEN is 0, 7.71 when DEN is 1)
There is 7mm, and when DEN is 2, it is 7.7f! 1mrd), 4'11 phone number (up to 20 digits), and user ID of the other party. All of this information is included in the DIS, and the CPU 4 sets each parameter based on the information in the DIS.

Next, the CPU 4 receives a page transmission request (LPT) from the host side.
), it transmits a digital command signal (DOS) to the other party's facsimile machine based on each parameter of the LPT. The parameters of this LPT are as shown in FIG.
(A3 when VER is 0), recording length (A4 when VER is 0, unlimited when VER is 2, B4 when VER is 2), maximum transmission rate (9600 bps when BPS is 0, 7200 bps when BPS is 1,
4800bps when set to 2, 2400bps when set to 3)
, resolution (3.8517 mm when DEN is O, 7.7 I!/mm when DEN is 1), and page retransmission capability (none when PRC is O, present when PRC is 1). and C
After sending the DOS to the other party's facsimile machine, PU4 sends the training signal and training check (TCP
) is sent to the other party's facsimile machine, and the LP is sent to the host side.
LR3, which is a response signal of T, is sent. and CPU4
is a reception readiness confirmation signal from the other party's facsimile machine (
CFR), and when the CFR is received, it waits for page data (CDT) from the host side. If the line condition with the other party's facsimile machine is poor and transmission cannot be performed at the desired transmission rate in DOS, it will automatically fall back and send training and TCP to the other party's facsimile machine again, but the page data will also be sent to the host side. Transmission should be waited for (a waiting signal indicating that fallback is in progress is sent. If the host side does not receive a waiting signal from the communication control unit 1, it will send page data to the communication control unit 1 after a predetermined time. When the CPU 4 of the communication control unit 1 receives page data from the host, it transmits the received page data to the other party's facsimile machine.

When the CPU 4 receives a document end notification (LDE) from the host side, it sends an end-of-procedure signal (EOP) to the other party's facsimile machine, and when it receives a message confirmation signal (MCF) from the other party's facsimile machine, the CPU 4 sends an LDE response to the host side. It sends out the LRS signal. Next, C
PU4 issues a line disconnection command (DC
After sending the facsimile end notification (N) to the host side,
LIE) and a telephone network disconnection notification (RNI).

When transmitting page data from the communication control unit 1 to the facsimile device described above, a facsimile procedure is performed between pages. For example, if the communication mode does not change and next page data is available, a multi-page signal is sent to the other party's facsimile, and an MCF is received from the other party's facsimile. Also, when the communication mode changes and there is next page data, the message terminal signal (ROM) is sent to the other party's facsimile, and after receiving the MCF from the other party's facsimile, the D is sent again.
O3° training, send TCP, receive CFR.

Further, when there is a page retransmission request from the receiving side, the CPU 4 of the communication control unit 1 transmits the data from the host stored in the RAM II again to the other party's facsimile machine.

Page data received from the host is stored in this RAM 11 by the CPU 4.

In the case of page retransmission, data to be retransmitted is read from this RAM 11 and transmitted. Further, when retransmitting a page, the CPU 4 sends a message or command to the host indicating that the page will be retransmitted.

Also, in the above explanation, the CPU 4 sends a standby signal to the host during fallback, but the page data sent from the host during fallback is stored in RAM II, and the receiving side prepares for facsimile after fallback is completed. The data may be transmitted from RAMII after the process is completed.

The above is an example of a sequence when the communication control unit 1 transmits a facsimile.

Figure 4 shows Just-pc using the LMD command mentioned above.
FIG. 3 is a flowchart showing switching between a procedure and a facsimile communication procedure.

In step Sl of FIG. 4, wait for an LMD command from the host, and when the LMD command is received, in step S2
Analyze the parameters of the MD, and if it is in facsimile mode, proceed to step S4; if it is in Just-PC procedure mode, proceed to step S3, and perform the same procedure as the above-mentioned facsimile transmission between the host and the communication control unit l. , and perform the Just-pc procedure.

In step S4, the facsimile mode flag is turned on and used as a flag indicating facsimile transmission. Next, in step S5, the facsimile transmission procedure described above is executed,
Check whether the facsimile transmission is completed in S6, and when the facsimile transmission is completed, turn off the facsimile mode flag in S7.
It will be in a standby state.

In other words, when in standby mode, it is in PC communication mode.

The above is a fax from the PC communication mode of this communication control device.
This is the procedure for switching the transmission mode.

Therefore, the RS handshake procedure between the communication control unit 1 and the personal computer is the same as that of Just-pc, and when sending a facsimile, the PC communication and facsimile transmission are separated by the command LMD. By using extended local CFU), one type of RS
PC communication and facsimile transmission can be performed using handshake procedures.

In the above-mentioned embodiment, a case has been described in which the communication control unit 1 has a facsimile communication procedure and a J11S t-pc procedure. Even when there are multiple different communication procedures such as a facsimile communication procedure or a Just-PC procedure, this can be implemented by increasing the parameters of the LMD command.

〔effect〕

As explained above, according to the present invention, two different communication procedures can be executed with a simple control procedure.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing the configuration of the telephone of this embodiment, Fig. 2 is a diagram showing an example of an RS handshake sequence, and Fig. 3 is an example of a sequence during facsimile transmission according to this embodiment. Figure 4 is a flowchart of the facsimile procedure and switching between Just-PC and @, and Figure 5 is a diagram showing the parameters of the procedure signal between the host and the communication control unit 1 of this embodiment. be. 1 is a communication control unit, 2 is an R3232C interface unit, 3 is a ROM, 4 is a CPU, 5 is a modulation/demodulation unit, and 6 is an NCU
. 7 is an external device, 8 is a telephone line, 9 is a speech network section, 10 is a handset, and 11 is a RAM. Figure 2 Figure 3 Figure 5 Zono/

Claims (1)

[Claims] Means for performing a first communication procedure; means for performing a second communication procedure; and means for transmitting and receiving signals to and from an external device, and based on a predetermined request signal from the external device, the first communication procedure is performed. a communication procedure and a control means for selectively executing the second communication procedure, and the control means performs the same control procedure for transmitting and receiving signals with an external device regardless of the communication procedure. Characteristic communication control device.