JP2002290494A - Modem - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make possible to efficiently set operation of a modem by eliminating the need for setting a data memory part or a comparative processing means corresponding to a plurality of modems in a terminal device. SOLUTION: An internal ROM 13 as a memory device on a modem 1 side connected to a terminal device 20 stores, for example, a conversion table 6 used for translation of AT commands. A conversion process part 3 on the MODEM 1 side translates the AT command input from the terminal device 20 by referring to the conversion table 6 and changes automatically the operation setting.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a modem for modulating and demodulating data between a terminal device and a line, and more particularly to a modem suitable for efficiently setting an operation based on an AT command or the like from the terminal device. Things.

[0002]

2. Description of the Related Art Conventionally, in an AT command compatible modem, AT command specifications differ from modem to modem.
On the terminal device side, the contents of the operation setting process must be changed for each connected modem.

As a conventional technique for solving such a problem, a terminal device for controlling an AT command compatible modem registers in advance a group of modem initial setting information and a group of modem control command data for a plurality of modems. When a modem is connected, it reads out the initial setting information and control command data corresponding to that modem, compares them with each data group registered on the terminal device side, and if there is a match, then it matches it. Some control the modem using registered modem initial setting information and modem control command data.

[0004] Incidentally, such techniques relating to the operation setting of the modem include, for example, a technique for setting the operating conditions of the modem described in JP-A-3-29536 and a technique disclosed in JP-A-7-20.
For example, there is a technique for automatically changing setting parameters described in JP-A-431, or a technique for automatically connecting a modem described in JP-A-2000-125028.

However, in such a conventional technique for automatically changing the operation setting of a modem, the operation setting change processing of the modem is performed on the terminal device side. There is a problem that a data storage unit and a comparison processing unit corresponding to a plurality of modems are required.

[0006]

The problem to be solved in the prior art is that a terminal device connected to a modem requires a data storage unit and a comparison processing means corresponding to a plurality of modems. is there.

[0007] It is an object of the present invention to solve these problems of the prior art and to provide a modem capable of efficiently setting an operation from a connected terminal device.

[0008]

In order to achieve the above object, a modem according to the present invention comprises a modem control command specification of a connected terminal device, for example, an AT command and an A command of a modem.
The conversion table corresponding to the T command specification is stored in the internal R
The AT command from the terminal device is translated into an ATM command of the modem side by referring to this conversion table, and is recorded in a storage device such as an OM or an external ROM. Based on the translated AT command, the AT command from the terminal device is translated. An operation setting process corresponding to the AT command is automatically performed.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a block diagram showing a first configuration example of a modem according to the present invention, and FIG. 2 is a block diagram showing a hardware configuration example of the modem in FIG.

In FIG. 2, reference numeral 1 denotes a modem for embedded use, 20 denotes a terminal device such as a personal computer. , CPU (Central Processing Unit)
And a ROM (Read Only)
Memory) 13 and RAM (Random Access Memor)
y) 14.

For example, by executing a program stored in the ROM 13 by the program execution unit 12,
Each function of the modem 1 shown in FIG. 1, that is, a serial interface control unit 2, a conversion processing unit 3, an AT command control unit 4, a modem control unit 5, a conversion table 6, and a data control unit 7 is configured.

In FIG. 1, the conversion table 6 is stored in the ROM 13 of FIG. 2, and the modem 1 inputs an AT command sequence from the terminal device 20 from the serial interface control unit 2, and the conversion processing unit 3 6 and sends the AT command sequence according to the contents of the
AT command of specification, that is, AT command control unit 4
The AT command is translated into an AT command that can be executed by the AT command control unit 4.
An operation setting process is performed by the modem control unit 5 and the data control unit 7.

Specifically, the terminal device 20 controls the modem 1 through the serial interface control unit 2 of the modem 1 and performs AT command communication. The serial interface control unit 2 controls communication between the terminal device 20 and the modem 1.

The operation setting function provided in the modem 1 includes a conversion processing unit 3 and a conversion table 6. The conversion processing unit 3 analyzes an AT command sequence received from the serial interface control unit 2 and refers to the conversion table 6. The command is translated into a command that can be executed by the AT command control unit 4.

The AT command control unit 4 requests the modem control unit 5 to execute the AT command according to the translated command. The modem control unit 5 sets the operation of the modem 1 via the data control unit 7, and performs communication via the telephone line based on the set contents.

As described above, in the modem 1 shown in FIG.
The AT command sequence input from the terminal device 20 via the serial interface control unit 2 is translated in the conversion processing unit 3 with reference to the conversion table 6 stored in the ROM 13 of FIG. Based on the execution result of the AT command control unit 4 based on the translated AT command sequence, the modem control unit 5 and the data control unit 7 execute an operation setting process.

In the built-in modem 1, once the target terminal device 20 is determined, the operation condition setting is fixed, so that the change processing and conversion (AT command translation) are performed.
The conversion table 6 used at the time is, as shown in this example,
It is good to record on OM13.

However, if the target terminal device 20 changes, the contents of the conversion table 6 must be changed. In such a case, as in the following examples shown in FIGS.
It is effective to record the conversion table 6 in an external ROM.

FIG. 3 is a block diagram showing a second configuration example of the modem according to the present invention, and FIG. 4 is a block diagram showing a hardware configuration example of the modem in FIG.

In FIG. 4, reference numeral 1a denotes a modem for embedded use, 20a denotes a terminal device such as a personal computer. , CPU (Central Processing U
nit) and a ROM (Rea)
d Only Memory) 13a and RAM (Random Acce
ss Memory) 14 and an external ROMU 15.

By executing the program stored in the ROM 13a by the program execution unit 12a, the program shown in FIG.
, The serial interface control unit 2, the conversion processing unit 3a, the AT command control unit 4, the modem control unit 5, the conversion table 6a, and the data control unit 7.

In FIG. 3, the conversion table 6a corresponds to FIG.
The modem 1a receives the AT command sequence from the terminal device 20a from the serial interface control unit 2, refers to the conversion table 6a in the conversion processing unit 3a, and converts the AT command sequence according to the contents. AT command of its own modem 1a specification, ie, AT
Translated into AT commands that can be executed by the command control unit 4,
Based on the result of the AT command control unit 4 executing the translated AT command, the modem control unit 5 and the data control unit 7
Performs an operation setting process.

Specifically, the terminal device 20a is connected to the modem 1
Modem 1 through serial interface control unit 2
a and the AT command communication. The serial interface control unit 2 controls communication between the terminal device 20 and the modem 1a.

The operation setting function of the modem 1a comprises a conversion processing unit 3a and a conversion table 6a recorded in the external ROM 15. The conversion processing unit 3a analyzes an AT command sequence received from the serial interface control unit 2. ,
AT command control unit 4 while referring to conversion table 6a.
Translates into commands that can be executed.

The AT command control unit 4 requests the modem control unit 5 to execute the command in accordance with the translated command. The modem control unit 5 sets the operation of the modem 1a via the data control unit 7, and performs communication via the telephone line based on the set contents.

As described above, in the modem 1a shown in FIG.
The AT command string input through the AT command string is translated in the conversion processing unit 3a in accordance with the contents thereof by referring to the conversion table 6a stored in the external ROM 15 in FIG. 4, and based on the translated AT command string. Based on the execution result of the AT command control unit 4, the modem control unit 5 and the data control unit 7 execute an operation setting process.

Hereinafter, the modem 1 in FIG.
An operation example of the modem 1a in FIG. 3 will be described with reference to FIG.

FIG. 5 is a flowchart showing an example of the processing operation of the modem in FIGS. 1 and 3.

When the modems 1 and 1a shown in FIGS. 1 and 3 become operable, the serial interface controller 2 checks whether the terminal devices 20 and 20a are connected (step 501). Then, it monitors whether the AT command sequence is received from the terminal devices 20 and 20a periodically (step 502).

When the AT command sequence is received, the contents of the AT command sequence are analyzed by the conversion processing units 3 and 3a (step 503). The conversion processing units 3 and 3a translate the analyzed AT command while referring to the conversion tables 6 and 6a (step 504). When the received AT command sequence is translated to the end by the conversion processing units 3 and 3a, the process is terminated (step 505).

As described above with reference to FIGS. 1 to 5, the modems 1 and 1a of this embodiment use the conversion tables 6 and 6 used for changing the operation settings by, for example, an AT command.
a is the internal ROM 13 or the external ROM of the modem 1 or 1a.
15 and the like, and the operation settings are automatically changed on the modem 1, 1a side.

As described above, since the conversion process of the AT command is performed by the modem 1, 1a, the operation setting of the modem 1, 1a can be automatically performed without changing the terminal devices 20, 20a. In particular, the conversion table 6 is provided outside the modem 1a.
a, the operation setting of the modem 1a can be automatically performed even when the terminal device 20a is changed.

The present invention is not limited to the examples described with reference to FIGS. 1 to 5, and can be variously modified without departing from the gist thereof. For example, in this example,
The operation setting of the modem by the AT command has been described.
It is not limited to the T command.

Further, in this embodiment, the modems 1 and 1a are modems for embedded use, and the internal ROM 13 and the external ROM 15 are used as a device for recording the conversion tables 6 and 6a. It can also be applied to modems that are not intended for use.
An external storage device such as a hard disk, or FD (Fl
A configuration may be adopted in which the information is recorded on a removable recording medium such as an exible disk) or a CD-ROM, and is recorded on the main memory via a driving device.

[0036]

According to the present invention, for example, translation (conversion) of an AT command is performed by a modem, so that the operation setting of the modem can be automatically performed without changing the terminal device connected to the modem. The terminal device does not need to be provided with a data storage unit and a comparison processing unit corresponding to a plurality of modems, and the operation settings of the modem can be set efficiently.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a first configuration example of a modem according to the present invention.

FIG. 2 is a block diagram illustrating an example of a hardware configuration of a modem in FIG.

FIG. 3 is a block diagram showing a second configuration example of the modem according to the present invention.

FIG. 4 is a block diagram illustrating an example of a hardware configuration of a modem in FIG. 3;

FIG. 5 is a flowchart showing an example of a processing operation of the modem in FIGS. 1 and 3;

[Explanation of symbols]

1, 1a: modem, 2: serial interface control unit, 3, 3a: conversion processing unit, 4: AT command control unit,
5: Modem control unit, 6, 6a: Conversion table, 7: Data control unit, 10: Serial interface, 11: Analog interface, 12, 12a: Program execution unit, 13, 13a: ROM, 14: RAM, 15: External ROM, 20, 20a: terminal device.

Claims (5)

[Claims] 1. A modem that modulates and demodulates data between a terminal device and a line, and records a conversion table in which a modem control command specification of the terminal device and a control command specification of the modem are associated with each other in a storage device. Means, by referring to the conversion table, a conversion processing means for translating a modem control command from the terminal device into a control command of a modem side specification, and a conversion command from the terminal device based on the control command translated by the conversion processing means. Control means for performing an operation setting process corresponding to the modem control command. 2. The modem according to claim 1, wherein the modem control command from the terminal device and the control command on the modem side are AT commands. 3. The modem according to claim 1, wherein the storage device comprises an external storage device. 4. The modem according to claim 1, wherein the modem is for embedded use, and the storage device comprises an internal ROM. 5. The modem according to claim 1, wherein said modem is for embedded use, and said storage device comprises an external ROM.