JPS6326140A - Communication control equipment - Google Patents

Abstract

PURPOSE:To improve the utilizing efficiency of a line by connecting a line at every start of a series of data communication and disconnecting the line at each end of the series of data communication. CONSTITUTION:An interface 4, a MODEM 7 and a telephone line control section 8 are used for the communication using a conventional telephone line 14, and an interface 6 and a digital transmission/reception section 9 are used for the communication using a digital line 15. Then the use of them is executed by a protocol control circuit 5 by selecting a CPU 1 and issuing a command to the protocol control circuit 5 by a command of the system controller of an information file device. The protocol control circuit 5, by the command from the CPU 1, executes the protocol for connection/disconnection or the like for the telephone line 1 or the digital line 15. Thus, the line is connected at each start of the series of data communication and the line is disconnected at each end of the series of data communication, then the line is connected only for a time when the data communication is actually performed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for controlling data communication between data processing devices such as information file devices.

[Prior art]

Image information is stored and registered in a storage medium such as an optical disk in a data processing device, for example, a solid device, and is searched by a terminal device connected to a communication line, and the searched image information is transferred to a storage medium such as an optical disk. It is now possible to perform data communication between information file devices and the like, such as data being received by a terminal device via a digital line.

A general procedure for data communication between such data processing apparatuses, for example, the above-mentioned information file apparatuses, via a digital line is as follows. for example,
When accessing a solid device in which image information is registered from a terminal device and reading the image information registered in the solid device, the operator first connects a digital line and then searches the terminal device for keywords, etc. When the information is entered manually, a search is performed in the solid device, and a search list as a result is transmitted from the solid device to the terminal device.

Therefore, the operator selects desired image information from the search list received at the terminal device and requests the solid device to transmit it. In response to this request, the solid device reads the requested image information from the recording medium and transmits it to the terminal device via the digital line.

Through the above processing, the operator located at the terminal device can read out desired image information from the solid device and obtain it.

[Problem that the invention seeks to solve]

Therefore, when communicating data between conventional data processing devices as described above, data communication is not actually taking place, for example, when an operator is reviewing a search list sent from a solid device to a terminal device. Meanwhile, the digital line remains connected. For this reason, when using a public line, the cost of using it increases, and when using a dedicated line with a limited number of lines, it may cause inefficient situations such as line congestion. It's inviting.

The present invention was made in view of these circumstances, and
It is an object of the present invention to provide a communication control device that solves the above-mentioned difficulties by connecting a line only when data communication is actually performed between data processing devices.

[Means for solving problems]

The communication control device of the present invention connects a line between data processing devices each time a series of data communications starts, and disconnects the line each time a series of data communications ends, thereby actually performing data communications. I try to connect the line only when it is available.

The present invention provides a communication control device for data processing devices that are connected via a communication line and communicate data with each other, including a protocol control circuit that controls connection and disconnection of the communication line, and a protocol control circuit that controls the protocol control circuit. The present invention is characterized by comprising a control unit that connects the communication line each time a series of data communications between the data processing devices starts, and disconnects the communication line each time the series of data communications ends.

[Effect]

In the communication control circuit of the present invention, the line is connected only during actual data communication between the data processing devices.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on drawings showing embodiments thereof.

FIG. 1 is a block diagram showing the configuration of a communication control device according to the present invention.

In this embodiment, the device of the present invention has an interface 10.
．． 11, it is connected to an information file device as a data processing device. The data processing device has a system control device that controls itself, and the device of the present invention controls communication based on commands from the system control device.

In the figure, reference numeral 1 denotes the CPU as a control unit of the device of the present invention, and as mentioned above, the CPU 6 controls the entire communication unit of the present invention based on commands given from the system control device of the information file device (not shown). The program ROM 2 stores various programs for controlling the device of the present invention. Further, the buffer RAM 3 stores various information generated during control by the device of the present invention.

Interface 4. The modem 7 and telephone line control unit 8 are used when communicating using a general telephone line 14,
The interface 6 and the digital transmitter/receiver 9 are used when communicating using the digital line I5. and,
Which of the two to use is selected by the CPU 1 in response to a command from the system control device of the information file device, and the protocol control circuit 5 executes the selection by commanding the protocol control circuit 5.

The protocol control circuit 5 receives instructions from the CPUI.
Protocols such as connection and disconnection of the telephone line 14 or digital line 15 are executed.

The device of the present invention is connected to an information file device, which is a data processing device, via an interface 10 and a command bus 12, and the command bus 12 allows various commands (commands) to be exchanged between the device of the present invention and the information file device.
is given and received. Further, the device of the present invention has an interface 11.
The information file device is connected to the information file device via a code data bus 12, and code data, specifically image information, is exchanged between the device of the present invention and the information file device via the code data bus 12.

The operation of the apparatus of the present invention configured as described above will be explained below.

First, a case in which image information is read by accessing the same (solid device) from the terminal device of the information file device via the digital line 15 will be explained. A control device shall be provided.

FIG. 2 is a flowchart showing a series of data communications, that is, a processing procedure from when a line is connected, when data is sent and received, until the line is disconnected.

When an operator instructs the terminal device to read image information, first, a line connection is established from the terminal device to the solid device. FIG. 3 is an explanatory diagram showing the procedure, where (al indicates the terminal device side, and the mountain) indicates the procedure on the solid device side.

When a call request is sent from the terminal device to the exchange, the exchange permits the transmission of a selection signal, that is, a signal indicating the communication partner of the terminal device. When the terminal device sends out a selection signal in response to this, an incoming call signal is given to the solid device from the exchange on the solid device side via the line. In response, the solid device sends an incoming call acceptance signal to the exchange, so that the exchange provides a communicable signal to the solid device and also provides a communicable signal to the terminal device via the terminal device side exchange. As described above, the terminal device and the solid device are connected through the line.

When the terminal device and the solid device are connected via the line as described above, both devices perform preliminary communication.

This preliminary communication is a mutual recognition code and communication ability.

This is a process of exchanging data such as the encoding method of image signals.

Then, when the preliminary communication is completed, actual data communication is performed. FIG. 4 is an explanatory diagram showing a more specific procedure for this data communication.

FIG. 4(a) shows the procedure when a terminal device causes a solid device to search for image information. First, a remote control mode signal RTCMD is sent from the system control device of the terminal device.
is given to the CPUI, the CPUI sends the remote command REMC (in this case, the signal RR instructing the search
ET (including search information such as keywords) is sent to the CPUI of the solid device via the line. When the CPU of the solid device receives the remote command REMC, it sends a remote command reception signal +? indicating that it has received the remote command ME)IC. RcMI) to the system controller of the solid device.

The system control device of the solid device receives the remote command reception signal RRCHD, searches for the instructed image information, and transmits the search result to the terminal device. That is,
The system control device of the solid device provides the remote control mode signal RTCHD to the CPUI of the solid device.
The search list signal RLS↑ is sent to the CPUI of the terminal device. When you send the signal RLS Ding for this search list,
On the solid device side, a command is given from the system control device to the CPUI, and line disconnection processing, which will be described later, is performed.

When CPt1l of the terminal device receives the search list signal RLST, it sends a remote command reception signal RPC? to the system control device of the terminal device. Give ID. Thereby, the system control device of the terminal device receives the search list transmitted from the solid bag 1 and displays it on, for example, a CRT display. Also, the system control device of the terminal device receives the remote command reception signal 1? I? By receiving the CMD, it is determined that a series of data communications for retrieving image information has been completed, and a command is given to CPIJl to disconnect the line.

FIG. 5 is an explanatory diagram showing the line disconnection procedure, where (♂) indicates the procedure on the terminal device side, and -) indicates the procedure on the solid device side, respectively.

First, when a command is given to the CPUI from the system control device of the terminal device and the old CP of the terminal device sends a line disconnection request signal to the exchange, the exchange sends a disconnection confirmation signal to the terminal device, and the terminal device side disconnects the line. is disconnected. Also (when the exchange receives a disconnection request signal from the terminal device,
The exchange also sends a disconnection instruction signal to the exchange on the solid equipment side, and the exchange on the solid equipment side gives a disconnection signal to the solid equipment in response to this disconnection instruction signal. In response to the application of the disconnection signal, the system controller of the solid equipment issues a cpui'q command to cause the cpui to send a disconnection confirmation signal to the exchange and disconnect the line.

The above process completes a series of processes for accessing the solid device from the terminal device and searching for image information. At this point, the search results for image information on the solid bag 1 are displayed on the CRT display or the like of the terminal device. Therefore,
When the operator specifies the desired image information and instructs to read the image information and send it to the terminal device, the line is connected as described above.

Preliminary communication is performed sequentially, and image information is read out through data communication.

(in Fig. 4) is an explanatory diagram showing the procedure. First, as in the case of search, when the control device of the terminal device receives the remote control mode signal RTCMD to cpui,
Is t1l a remote command l? EMc (however, in this case, it is a signal RRDO instructing readout, which also includes data specifying the image information to be read out) is given to the CPUI of the solid device. When CPt11 of the solid device is given the remote command REMC (RRDO), it sends a remote command reception signal R to the system control device of the solid device.
RC? ID, the system controller of the solid device reads the specified image information from the recording medium.

The image information read out by the solid device through the above processing is
The system control device of the solid device gives an encoding start signal C0DST to the CPUI, and after encoding processing for communication is performed, transmission to the terminal device is started. When the CPUI of the terminal device receives encoded image information from the solid device, it sends a remote decoding start signal to the control device)
Give IDDsT. This remote decoding start signal R
By being given DDST, the system controller of the terminal device starts receiving and decoding the image information.

When the transmission of the image information in the solid device is completed, a coding end signal CDEND is given from the CPU of the solid device to the system control device, and the processing on the solid device side is completed. On the terminal device side, when the reception of the image information is completed, a coding end signal CDEND is given from the CPU to the system control device, and a series of data communications ends.

As described above, the reading of the image information designated by the terminal device by the solid device and its transmission to the terminal device are completed, and the process of disconnecting the line is then performed in the same manner as described above.

In this way, in conventional devices, from the time when the transmission of image information search results to the terminal device is completed until the terminal device transmits a signal specifying the image information to be read in order to read the image information, Although the line was left connected for no reason, the device of the present invention automatically disconnects the line during that time.

Note that TCI in FIG. 4 shows a procedure for transmitting image information read by a terminal device to a solid device and registering it.

To briefly explain, the remote command REMC sent from the CPU of the terminal device to the solid device is the registration signal RIIEG (including search information for registration, etc.)
In response, an acknowledge signal ACK is transmitted from the solid device to the terminal device, thereby starting transmission of image information from the terminal device to the solid device. This transmission of image information is performed in the same manner as the transmission of image information from the solid device to the terminal device described above. When the transmission of the image information from the terminal device to the solid device is completed, an acknowledge signal A (J) is transmitted from the solid device to the terminal device, and the series of data communications ends.

〔effect〕

As described above, in the present invention, the line is connected each time a series of data communications starts, and the line is disconnected each time this series of data communications ends, thereby improving the efficiency of line usage.

Note that the device of the present invention can of course use not only a digital line but also a conventional general telephone line as a communication medium.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of the communication control device of the present invention, FIG. 2 is a flowchart for explaining its operation, and FIG.
The figure is an explanatory diagram showing the procedure for line connection, Figure 4 (al is for retrieving image information, the mountain) is an explanatory diagram showing the procedure for reading, (C1 is registration), and Figure 5 is the procedure for disconnecting the line. It is an explanatory diagram showing 1... C205... Protocol control circuit 8...
・Telephone line control section 9...Digital transmission/reception section 1
4...Telephone line 15...When using digital line

Claims (1)

[Scope of Claims] 1. A communication control device for data processing devices that are connected via a communication line and communicate data with each other, comprising: a protocol control circuit that controls connection and disconnection of the communication line; and a protocol control circuit that controls the protocol control circuit. and a control unit that connects the communication line each time a series of data communications between data processing devices starts and disconnects the communication line each time a series of data communications ends. Device.