JP2947890B2 - Response signal control method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Summary] In a line termination device for connecting a data terminal device to a public telephone line or the like, a response signal control method for generating a response signal in accordance with a predetermined communication protocol is described. A signal recognition process for recognizing an instruction signal from a data terminal device for the purpose of simplifying the structure of a processing program for performing signal processing with a terminal device and reducing the memory capacity required for storing the program. And a response signal creation process for creating a signal corresponding to the signal recognized in the signal recognition process in accordance with a communication protocol determined between the data terminal device, and the signal recognition process and the response signal creation process. The recognition of the instruction signal and the generation of the response signal are performed in a lump, and determined at least in accordance with the on / off of the instruction signal or the response signal. The processing is performed without depending on the status information to be processed.

[Industrial applications]

The present invention relates to a response signal control method for generating a response signal in accordance with a predetermined communication protocol in a line termination device for connecting a data terminal device to a public telephone line or the like.

[Conventional technology]

2. Description of the Related Art A line termination device such as a telephone having a connection portion with a data terminal device and having a function of connecting the data terminal device to a telephone line is known. In the main device, conventionally, in processing a connection request or the like from the data terminal device, state information corresponding to a state determined by an instruction signal from the data terminal device and a response signal to the instruction signal is created,
Processing was performed according to the state information.

In the conventional response signal control method, for example, as shown in the state transition diagram of FIG. 7, an instruction signal (E
R, RS, etc.), and the telephone's response signal (D
R, CS, etc.) on and off define the main state and sub-states that belong to the lower level of the main state. Based on these state information (state number), signal recognition processing and response signal creation processing And so on.

FIG. 8 is a flow chart showing processing contents based on the conventional response signal control method executed in the telephone described above. In the following processing, it is assumed that when the instruction signal and the response signal have the conditions shown in the state transition diagram of FIG. 7, the state numbers shown in FIG. 7 are defined.

First, it is determined whether the main state number is “0” (FIG. 8, S1). If the main state number is "0", it is next determined whether the sub state number is "0" (S2). If the sub state number is "0", a signal from the data terminal device is detected next to determine whether or not the data terminal ready signal ER is on (S3).
If the data terminal ready signal is on, after executing the processing 1 corresponding to the state (S4), the sub state number is set to "1" and the data set ready signal DR is turned on (S5).

If the sub state number is not "0" in the determination in step S2, it is next determined whether the sub state number is "1" (S6). If the sub state number is "1", it is determined whether or not the data terminal ready signal ER has been turned off during that time (S7). If the signal ER has been turned off, the processing 2 relating to that state is executed. (S8), the sub state number is returned to "0", and the data set ready signal DR is turned off (S9).

At this time, if the ER signal remains on, it is next determined whether or not the transmission request signal RS is on (S10). If the signal RS is on, after executing the processing 3 relating to the state (S11), the main state number is set to "2", the sub state number is set to "0", and further the transmission permission signal CS and the carrier detect signal CD are set. Is turned on (S12). Although not shown in the flowchart of FIG.
After making a similar determination for each state in the state transition diagram of FIG. 7, an instruction signal from the data terminal device is detected, and a process of creating a response signal, state information, and the like based on the detection result is performed. I was

[Problems to be solved by the invention]

 The above-described conventional response signal control method: (1) Recognizes a main state number.

(2) Recognize the sub state number.

(3) Recognize the instruction signal from the data terminal device.

(4) Create a response signal to the data terminal device.

(5) Create a new main state number or sub state number.

The processing was performed according to the following procedure. Therefore, if the number of states (for example, the number of states shown in the state transition diagram of FIG. 7) determined by the response signal of the own terminal of the instruction signal from the data terminal apparatus increases, the states are determined, and then the instruction is performed. Since it is necessary to perform signal recognition processing, response signal generation processing, new state number generation processing, and the like, there has been a problem that the program capacity increases.

In particular, when a connection function with a data terminal device is provided in a telephone or the like, it is desired to reduce the program capacity and the required memory capacity in order to reduce the cost of the telephone.

SUMMARY OF THE INVENTION It is an object of the present invention to simplify the production of a processing program for performing signal processing with a data terminal device, and to reduce the memory capacity required for storing the program.

[Means for solving the problem]

 FIG. 1 is a diagram illustrating the principle of the present invention.

In the response signal control method according to the present invention, the signal recognition processing 1 recognizes the instruction signal (ER, RS) from the data terminal device 13 and the response signal creation processing 2 responds to the signal recognized in the signal recognition processing 1 (DR, CS, CD) are collectively performed, and the processing is executed without depending on the state information determined according to the ON / OFF of the instruction signal or the response signal.

[Action]

In the response control method of the present invention, after determining what the state information is in the signal recognition processing 1 and the reception signal creation processing 2, each time the instruction signal (ER, RS) and the response signal (DR) at that time are determined. , CS, and CD), the structure of the programs is simplified, and the memory capacity for storing those programs can be reduced.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 2 shows a telephone (auto call phone) for transmitting and receiving signals to and from the data terminal device (DTE) 13 based on the response signal control method of the present invention and connecting the data terminal device 13 to a telephone line. It is a block diagram of.

In FIG. 1, a telephone function unit (TEL) 11 is a circuit having a general telephone function, and performs a connection operation with an exchange according to a user's dial operation or an instruction of an automatic dial unit 12 described later. . Automatic dial section (ACA) 12
Is a circuit that performs an interface between the telephone function unit 11 and the data terminal device 13, exchanges data with the data terminal device 13 via the RS232C interface, controls the telephone function unit 11, and automatically makes an outgoing call. Performs automatic incoming calls and so on.

Next, FIG. 3 is a circuit block diagram of the automatic dial section 12. In the figure, the RS232C driver / receiver 14
This is a circuit that receives a signal sent from the data terminal device 13 via the RS232C line and sends a response signal created by the automatic dial unit 12 to the RS232C line.

The loopback unit 15 is a circuit that operates when a test switch is operated to return data sent from the data terminal device 13 and detect an error. The US as it is
Output to ART16 or MPU17. USART 16 is an LSI for asynchronous and synchronous communication, and receives serial data from the data terminal device 13 according to a specified communication procedure.
The data is output to the MPU 17 and the data from the MPU 17 is output to the data terminal device 13.

The MPU 17 is a data terminal device 1 according to the communication protocol of RS232C.
This is a microprocessor that sends and receives signals to and from 3 and recognizes received signals, creates response signals, and receives data.

Next, the operation sequence of the auto call phone when there is a call request from the data terminal device 13 will be described with reference to FIG.

When the data terminal ready signal ER of the data terminal device 13 is turned on, the data set ready signal DR of the automatic dial section 12 is turned on.
Is turned on to notify that the auto call phone is operable.

Next, when the transmission request signal RS from the data terminal device 13 is turned on, the signal CS indicating that the automatic dial unit 12 is in a state capable of transmitting and receiving and the signal CD indicating that the carrier is being received are turned on. Is done. The signal recognition, response signal creation processing, and the like in the automatic dial unit 12 will be described later in detail.

Next, when dial data is received together with the call command "CRN", the headset key is turned on by the automatic dial unit 12, and a call signal is sent to the exchange. Then, when the dial tone (DT) is returned from the exchange, a dial signal is sent from the automatic dial unit 12 to the exchange, and the destination terminal is called. If the remote terminal receives a response and detects that the exchange has reversed the polarity or that 10 seconds have passed after the completion of dial signal transmission, the command "COM" is sent from the automatic dial unit 12 to the data terminal device 13 to inform the data terminal device 13 that the line has been connected. Is sent.

Thereafter, when the transmission request signal RS of the data terminal device 13 is turned off, the signals CS and CD of the automatic dial section 12 are turned off. Further, when the data terminal ready signal ER is turned off,
The data set ready signal DR of the automatic dial section 12 is turned off, and a headset call is started.

Next, in the above-described operation sequence, processing operations such as signal recognition and response signal generation in the automatic dial unit 12,
This will be described with reference to the flowchart of FIG.

First, it is determined whether or not the data terminal ready signal ER for informing that the data terminal device 13 can transmit and receive is on (FIG. 5, S21). If the ER signal is on, the data set ready signal DR indicating that the automatic dial section 12 is operable is turned on (S22). At this time, ER
If the signal is off, the DR signal is turned off (S23).

When the creation of the data set ready signal DR is completed, it is next determined whether or not the transmission request signal RS from the terminal is on (S24). If the RS signal is on, a signal CS indicating that the automatic dial unit 12 is in a state capable of transmitting and receiving and a signal CD indicating that a carrier is being received are turned on (S2
Five). At this time, if the RS signal is off, the signal CS and the signal CD are turned off (S26).

Since the signal recognition and the response signal creation processing are completed by the above processing, next, the state transition processing of step S27 and subsequent steps is executed. In the response signal control method according to the present invention, the determination of the state information is not performed in the signal recognition processing and the response signal creation processing. Therefore, it is not necessary to set the state information in correspondence with the on / off state of the instruction signal and the response signal from the data terminal device 13, and the number of states required in the entire processing can be reduced. Thereby, as shown in the state transition diagram of FIG. 6, for the signal from the data terminal device 13, it is sufficient to define only the state related to the ON / OFF of the signal ER.

In FIG. 5, it is first determined whether or not the main state number is “0” (S27). If the main state number is "0", it is determined whether the sub state number is "0" (S28).

If the main state number is "0" and the sub state number is "0", it is next determined whether or not the signal ER is on (S29). If the signal ER is on, the process 51 relating to the state at that time is executed (S30), and the sub state number is set to "1" (S31). At this time, if the signal ER is off, the state number is not changed, and the process ends.

If the sub state number is not "0" in the determination in step S28, it is next determined whether or not the sub state number is "1" (step S32).

If the sub state number is "1", it is next determined whether or not the signal ER is off (S33). If the sub-state number is "1" and the signal ER is off, the signal ER is once turned on and then turned off. Therefore, after performing the processing 52 relating to the state at that time (S34), the sub-state number Is set to "0" (S35).

On the other hand, if the signal ER is on, it is determined whether a command has been received next (S36). If the command has been received, the process 53 relating to the status at that time is executed (S37), and then the main status number is set to "1" and the sub status number is set to "0" (S38).

As described above, in the conventional processing procedure, as a process prior to the signal recognition process, the state is determined, and then the on / off of the signal from the data terminal device at that time, and the generation of the response signal are performed. Although ON and OFF are detected each time, in the response signal control method of the present invention, the data terminal device 13 is used.
By performing the recognition of the signal from the controller and the generation of the response signal in a lump, it is not necessary to perform the state determination in the signal recognition processing and the response signal generation processing, and the structure of the processing program is simplified. Thereby, the memory capacity for storing these processing programs can be reduced.

Further, since it is not necessary to define the state information corresponding to the ON / OFF of each signal, the number of states defined in the state transition diagram can be reduced, and the program of the state transition processing is simplified.

〔The invention's effect〕

According to the present invention, by recognizing a signal from a data terminal device and creating a response signal in a lump, it does not depend on state information defined corresponding to ON / OFF of a reception signal or a response signal. A signal recognition processing and a response signal creation processing program can be configured. Therefore, the structure of these processing programs is simplified, and the capacity of the memory for storing the programs can be reduced.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining the principle of the present invention, FIG. 2 is a block diagram of an embodiment, FIG. 3 is a circuit block diagram of an automatic dial section, FIG. 4 is an operation sequence diagram of the embodiment, FIG. Fig. 6 is a flowchart showing the processing operation of the embodiment. Fig. 6 is a state transition diagram of the embodiment. Fig. 7 is a state transition diagram by a conventional response signal control method. Fig. 8 is a conventional response signal control. It is a flowchart which shows the processing operation by a method. 1 ... Signal recognition processing, 2 ... Response signal creation processing.

Continued on the front page (72) Inventor Masahiro Todo 3-9-18 Shin-Yokohama, Kohoku-ku, Yokohama, Kanagawa Prefecture Inside Fujitsu Daiichi Tsushin Software Co., Ltd. (72) Inventor Yukie Sato 3-9-1 Shin-Yokohama, Kohoku-ku, Yokohama, Kanagawa No. 18 Fujitsu Daiichi Tsushin Software Co., Ltd. (72) Inventor Hiroshi Ono 3-9-1 Shin Yokohama, Kohoku-ku, Yokohama City, Kanagawa Prefecture No. 18 Fujitsu Daiichi Tsushin Software Co., Ltd. (72) Inventor Atsumi Sano Yokohama, Kanagawa Prefecture 3-9-18 Shin-Yokohama, Kohoku-ku Fujitsu Daiichi Tsushin Software Co., Ltd. (72) Inventor Atsushi Murai 2--18-2 Nishigotanda, Shinagawa-ku, Tokyo Hasegawa Electric Works, Ltd. Int.Cl. ⁶ , DB name) H04L 29/08

Claims (1)

(57) [Claims] An instruction signal (E) from a data terminal device (13).
R, RS) and a response signal (DR) to the signal recognized in the signal recognition process (1) according to a communication protocol determined between the data terminal device (13) and the data terminal device (13). , CS, CD), and the recognition of the instruction signals (ER, RS) and the response signal (DR) in the signal recognition process (1) and the response signal creation process (2). , CS,
CD) and perform processing independently of at least the status information determined by turning on or off the instruction signal (ER, RS) or response signal (DR, CS, CD). A response signal control method.