JP2921105B2 - Modem with condition diagnosis function - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Summary] The present invention relates to a modem having a telephone line switching function. The operating state of the modem is diagnosed, and as a result, if the modem is not operating properly, the modem is optimized. A switching line control unit for controlling a switching line by connecting an external switching unit to a demodulation unit and a modulation unit, and an external communication execution unit for connecting the demodulation unit and the modulation unit with each other. A modem having a data communication control unit connected to and controlling data communication, a state detection unit for detecting a control state of the switching line control unit and a control state of the data communication control unit, and a state detection unit. An interface for outputting detection data to the outside is provided, and the interface receives a reset command based on the output detection data, and issues a reset command to the switching line control unit and the data communication control unit. It is obtained so as to force.

The modem further includes a state detection unit that detects a control state of the switching line control unit and a control state of the data communication control unit; a reset state storage unit that stores a control state of an abnormal state to be reset; A switching unit for comparing the storage contents of the state storage unit with the detection data of the state detection unit and outputting the reset command to the data communication control unit when they match.

The modem further includes a state detection unit that detects a control state of the switching line control unit and a control state of the data communication control unit, and a reset command of an external operation input that resets the control state to an initial state. An interface for outputting the reset command to the switching line control unit and the data communication control unit; a reset state storage unit for storing detection data of the state detection unit when the interface outputs the reset command; A switching unit that outputs the reset command to the switched line control unit and the data communication control unit when the storage content of the state storage unit matches the detection data of the state detection unit.

Also, to the modem, a state detection unit for detecting a control state of the switching line control unit and a control state of the data communication control unit, outputting detection data of the state detection unit to the outside, and inputting based on the output. An interface for outputting the reset command to the switching line control unit and the data communication control unit to reset the respective control states to the initial state, and the state detection unit when the interface outputs the reset command. A reset state storage unit for storing detection data; and outputting the reset command to the switching line control unit and the data communication control unit when the storage content of the reset state storage unit matches the detection data of the state detection unit. A comparison unit is provided.

[Industrial applications]

The present invention relates to a modem having a telephone line switching function.

Conventionally, a modem with a switching function for connecting a remote computer and a terminal using a telephone line has been used. This is RS232C with computers and terminals (EIA standard of the Electronic Industries Association of America, the same is JIS: X5101 and international standard CCITT: V.24)
It has both an interface and a telephone line switching function, and can perform functions such as automatic calling and automatic receiving.

However, the modem with the exchange function often has a telephone line hang-up because the exchange function on the exchange side, the exchange function of the modem and the control unit function of the RS232C signal, and the interface of the RS232C signal on the computer side are slightly different. In some cases, the automatic call receiving function did not work properly due to the failure of the modem or the like. Here, the hang-up state is a state in which operations such as automatic reception of the modem are not performed normally.For example, a call is received from the modem and the call is received once, but the connection procedure to the host is performed thereafter. The caller hangs up the phone when he gets it, but the modem keeps the line, and the next time a call arrives, the phone is busy. is there.

[Conventional technology]

Conventionally, when using a modem with a switching function to provide automatic reception service, if the state of the telephone line hangs up, it could not be detected from the RS232C interface side of the computer .

The first and simplest way to detect whether the modem is hung is to visually determine the indicator attached to the modem by the operator. The modem is provided with an on / off display indicating whether or not normal communication is being performed, and an indicator indicating communication and an output state of the control signal. Here, the communication and the abbreviation of the JIS display of this control signal will be described.

SD: transmission data; data sent from the terminal to the other party via the modem RD: reception data; data received from the other party via the modem RS: transmission request; signal requesting the modem to transmit from the terminal CS: communicable ; Transmission permission signal returned from modem to RS DR: Data set ready; Signal from modem to acknowledgment from modem to terminal ER: Data terminal ready; Modem operates from terminal prior to transmission Signal for requesting to be in a possible state CD: Data channel reception carrier detection; signal for notifying the terminal that the receiving modem has detected the carrier (carrier) from the other modem The second method is a computer This is a method of turning off the ER signal at regular intervals regardless of whether the modem is hung up on the side. With a normal modem, the communication state can be reset when the ER signal is turned off, thereby re-establishing the communication connection and eliminating the hang-up state.

The third method is a method of actually calling a telephone line of a modem and confirming that the connection is actually established. If it is not connected properly, it is a method to determine that there is an abnormality in the modem.

In any of these three methods, if it is determined that the modem is hung up, the state of the modem can be reset manually or by temporarily turning off the ER signal from the computer.

[Problems to be solved by the invention]

However, when the operator monitors the status of the indicator,
In the method of (1), it is necessary for the operator to go to the place where the modem is installed each time, and even if the time required for one check is small, it requires a considerable amount of labor to perform the check periodically. Furthermore, since the indicator of the modem is only a guide and it is not considered so that all states can be understood, it is difficult to accurately determine that the modem is hung up from this indicator. .

In the second method, since the ER signal is periodically turned off, the modem is reset regardless of whether or not the modem is actually hung up. It happens that it is over.

In the third method, since the connection is actually confirmed by calling, the abnormality of the modem can be detected fairly accurately, but there is a possibility that the communication of the user who actually tries to connect to the computer from the telephone line may be hindered. .

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and provides a modem with a state diagnosis function for diagnosing an operating state of a modem and, if the operation is not proper, as a result, optimizing the modem. The purpose is to:

[Means for solving the problem]

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

In the figure, 1 is a demodulation unit, 2 is a modulation unit, 3 is a switching line control unit, which connects an external exchange with the demodulation unit 1 and the modulation unit 2 to interface with a switching line for transmitting and receiving a modem and for communication. On and off. Reference numeral 4 denotes a data communication control unit which performs an RS232C interface with a communication execution device such as a computer or a terminal. It inputs and outputs control signals such as ER and DR, and also communicates actual data (data to be transmitted excluding control signals) between communication implementing machines. Reference numeral 5 denotes a state detector, which is a control state of the switching line control unit 3 (hereinafter, the control state is also simply referred to as a state, here, whether or not the telephone is connected as a telephone, whether an analog signal is actually flowing, etc.) and data communication control. It detects the state of the unit 4 (ON / OFF of each signal line defined by RS232C such as ER, DR, RS, CS, etc.). Reference numeral 6 denotes an interface that outputs data detected by the state detection unit 5 to an external diagnostic terminal.

Further, the interface 6 inputs a reset command based on the output detection data from the diagnostic terminal, outputs a reset command to the exchange control unit 3 and the data communication control unit 4, and changes the control state before connection. Reset to the initial state, which is the state (hereinafter, reset the communication state).

 FIG. 2 is a second principle diagram of the present invention.

In this figure, each of the parts 1 to 5 has the same function as in FIG. Reference numeral 7 denotes a reset state storage unit which stores in advance the control states of the switching line control unit 3 and the data communication control unit 4 when the modem needs to be reset in an abnormal state. Numeral 8 denotes a comparing unit which compares the stored contents of the reset state storage unit 7 with the detection data of the state detecting unit 5 and, when they match, issues a communication state reset command to the switching line control unit 3 and the data communication control unit 4. Output.

 FIG. 3 is a third principle diagram of the present invention.

In this figure, the components 1 to 5 and 8 have the same functions as in FIG. Reference numeral 6 denotes an interface for outputting a communication state reset command to the switching line control unit 3 and the data communication control unit 4. Reference numeral 7 denotes a reset state storage unit. The interface 6 receives an external operation input reset command. The data detected by the state detector 5 when the reset command is output is stored as a reset state.

 FIG. 4 is a fourth principle diagram of the present invention.

In this figure, the components 1 to 5, 7, and 8 have the same functions as those in FIG. Reference numeral 6 denotes an interface, which inputs the detection data of the state detection unit 5 and outputs the data to the diagnostic terminal. Output to the communication control unit 4.

(Operation)

With the above configuration, in the case of the first principle diagram, the states of the switching line control unit 3 and the data communication control unit 4 are detected by the state detection unit 5 and output to the diagnostic terminal via the interface 6, so that the hang-up occurs. The state can be detected by visual observation or state analysis remotely, and if the detected data is examined and it is found that the state is a hang-up state, a reset signal is sent from the interface 6 to the switching line control unit 3 and the data communication control unit 4. The hang-up state can be eliminated by sending and resetting.

In the case of the second principle diagram, the state to be reset is stored in the reset state storage unit 7 in advance, and compared with the detection data of the state detection unit 5, the reset command is sent from the comparison unit 8 when they match with each other. 3 and output to the data communication control unit 4 for resetting, once the state to be reset is set in the memory, the reset command is automatically output in that state, and the hang-up is automatically eliminated. it can.

In the case of the third principle diagram, a reset signal is output from the interface 6 to the exchange control unit 3 and the data communication control unit 4 by an external operation to be reset. By storing the detection data of the state detection unit 5 at this time as a reset state in the reset state storage unit 7, if a reset state subsequently occurs, the reset is automatically performed and the hang-up state is eliminated.

In the case of the fourth principle diagram, the interface 6 outputs the state of the modem to the diagnostic terminal as detection data of the state detector 5, judges the hang-up state at the diagnostic terminal, and inputs the hang-up state. A reset signal is output to the switching line control unit 3 and the data communication control unit 4 for resetting. The reset state storage unit 7 inputs and stores the state at the time of reset from the state detection unit 5, and automatically outputs a reset signal from the comparison unit 8 to the switched line control unit 3 when the modem enters the same reset state. The data is output to the data communication control unit 4 and reset. This eliminates the hang-up state.

〔Example〕

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

FIG. 5 is a block diagram showing the configuration of the embodiment of the present invention. In the same figure, each part in a thin line frame shows a known device, and each part in a thick line frame shows a device added in this embodiment.

A demodulation unit 10 extracts an original signal from the modulated signal. Numeral 11 denotes a modulator for changing the parameters of the carrier signal for signal transmission according to the input signal. Reference numeral 12 denotes a conversion line control unit, which interfaces data transmission and reception with the switching line, and performs on / off operation of a line which is a function as a receiver. Reference numeral 13 denotes an RS232C control unit that performs an RS232C interface between connected computers and terminals, and
Communication of actual data to be communicated between a signal control unit such as... And a computer or a terminal is performed. 14 is a 25-pin connector, 15 is a control unit that controls the modulation unit 11, the switching line control unit 12, and the RS232C control unit 13, and 16 is a switch that turns on and off the ER signal line,
When the switch is turned off, the switching line controller 12 is also reset. Reference numeral 17 denotes a detection circuit, which is a receiver ON / OFF signal of the conversion line control unit 12 and ER, DR, RS, CS, CD of the RS232C control unit 13.
Are detected. Reference numeral 18 denotes a storage circuit which will be described later.
The detection data of the detection circuit 17 is stored according to the instruction. A comparison circuit 19 compares the detection data of the detection circuit 17 with the storage data of the storage circuit 18 and detects whether or not they match. 20 is RS23
The 2C control unit is the same as the RS232C control unit 13 in hardware, outputs detection data of the detection circuit 17 to the diagnostic terminal, and inputs a command from the diagnostic terminal. Reference numeral 21 denotes a command table in which the contents of commands input from the diagnostic terminal are stored. A command recognition unit 22 interprets the meaning of the command input from the diagnostic terminal and the comparison circuit 19 from the command table 21 and requests the control unit 23 for the content of the command. Reference numeral 23 denotes a control unit.When a reset command is input from the command recognition unit 22, the switch 16 is operated to cut off the ER output and reset, and the detection data of the detection circuit 17 is transmitted to the RS232C control unit 20, and reset. When an instruction is output, the detection data at that time is stored in the storage circuit 18 as reset data.

 Next, the operation will be described.

First, the detection circuit 17 outputs an ON / OFF state signal of the handset from the exchange line control unit 12 and ER, D from the RS232C control unit 13.
Receives R, RS, CS, and CD signals. The command sequence input from the RS232C control unit 20 is compared with the command registered in the command table 21 by the command recognizing unit 22, and if it matches, the control unit 23 processes according to the meaning. FIG. 6 shows the command names stored in the command table 21 and their operations. In show all
The status of the control signals ER, DR, RS, CS, and CD is shown, and show d
In ialline, the ON / OFF state of the handset of the switching line control unit 12 is notified. In reset, the switch 16 is turned off, the ER signal is turned off, and reset is performed.

Here, when a command for a status request such as show all is input from the diagnostic terminal, the control unit 23 shapes the signal detected from the detection circuit 17 into a predetermined format and converts the signal to RS232C.
Output from the control unit 20. In the case of a communication state reset command, the control unit 23 turns off the switch 16, turns off the ER signal input from the computer to the modem, and resets the modem state.

The detection data of the detection circuit 17 is input to the storage circuit 18 and is stored as reset data in accordance with an instruction from the control unit 23 at the timing when the reset command is executed by the control unit 23 (turn off the switch 16). The reset data stored in the storage circuit 18 and the state detected by the detection circuit 17 are always compared by the comparison circuit 19, and when both match, a reset command is issued from the comparison circuit 19 to the command recognition unit 22, and the control unit At 23, the switch 16 is turned off and the modem is reset.

The diagnostic terminal monitors the state detection data from the detection circuit 17 and outputs a reset instruction when a hang-up state occurs. This may be performed by an operator, or may be monitored by a program and output a reset instruction. You may do so.

〔The invention's effect〕

As is apparent from the above description, the present invention provides a modem with a state detecting device, monitors the communication state of the modem, resets the modem if necessary, eliminates the hang-up state, and allows the And smooth communication between the modem and the like.

[Brief description of the drawings]

1 is a first principle diagram of the present invention, FIG. 2 is a second principle diagram of the present invention, FIG. 3 is a third principle diagram of the present invention, FIG. 4 is a fourth principle diagram of the present invention, and FIG. FIG. 6 is a block diagram showing the configuration of the embodiment of the present invention, and FIG. 6 is a diagram for explaining the contents of a command table. In the figure, 1 ... demodulation unit, 2 ... modulation unit, 3 ... switching line control unit, 4 ... data communication control unit, 5 ... state detection unit, 6 ... interface, 7 ... reset state storage unit , 8... Comparison section.

Claims (4)

(57) [Claims] A switching line control unit (3) for connecting an external switch to a demodulation unit (1) and a modulation unit (2) to control a switching line, the demodulation unit (1) and the modulation unit (3). And a data communication control unit (4) for controlling data communication by connecting the data communication control unit (2) to an external communication execution device. ), A state detection section (5) for detecting the control state, and an interface (6) for outputting detection data of the state detection section (5) to the outside, and the interface (6)
Receives the reset command based on the output detection data, outputs the reset command to the switching line control unit (3) and the data communication control unit (4), and resets the respective control states to the initial state. A modem with a condition diagnosis function. 2. A switching line control unit (3) for connecting an external switch to a demodulation unit (1) and a modulation unit (2) to control a switching line, the demodulation unit (1) and the modulation unit (2). And a data communication control unit (4) for controlling data communication by connecting the data communication control unit (2) to an external communication execution device. ), A state detection unit (5) for detecting a control state of an abnormal state to be reset, a reset state storage unit (7) storing a control state of an abnormal state to be reset, a storage content of the reset state storage unit (7), and the state detection. The detected data of the unit (5) are compared and when they match, the reset command is output to the switching line control unit (3) and the data communication control unit (4) to reset the respective control states to the initial state. And a comparing unit (8) to be provided. Modem with state-diagnosis function. 3. A switching line control unit (3) for connecting an external exchange to a demodulation unit (1) and a modulation unit (2) to control a switching line, the demodulation unit (1) and the modulation unit (3). And a data communication control unit (4) for controlling data communication by connecting the data communication control unit (2) to an external communication execution device. ) And a switching control unit (3) and a data communication control unit (4) upon receiving a reset command of an external operation input for resetting the control state to an initial state. An interface (6) for outputting the reset command to the controller, a reset status storage unit (7) for storing detection data of the status detector (5) when the interface (6) outputs the reset command, This reset state storage unit (7 When the storage content of the data matches the detection data of the state detection section (5), the switching section control section (3) and the comparison section (8) for outputting the reset command to the data communication control section (4) A modem with a condition diagnosis function, which is provided. 4. An exchange control unit (3) for connecting an external exchange to a demodulation unit (1) and a modulation unit (2) and controlling an exchange line, the demodulation unit (1) and the modulation unit (3). And a data communication control unit (4) for controlling data communication by connecting the data communication control unit (2) to an external communication execution device. ), A state detector (5) for detecting the control state, outputting detection data of the state detector (5) to the outside, and outputting a reset command based on the output to the switching line controller (3). ) And an interface (6) for outputting to the data communication control unit (4) and resetting the respective control states to the initial state, and the state detection unit (6) when the interface (6) outputs the reset command. 5) The memory for storing the detection data A reset state storage unit (7), and when the storage content of the reset state storage unit (7) matches the detection data of the state detection unit (5), the switching line control unit (3) and the data communication control A comparing section (8) for outputting the reset command to the section (4).