JPH0793659B2 - Communication device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication device such as an intelligent type modem device incorporating a microprocessor.

<< Summary of the Invention >> According to the present invention, an inquiry is made in advance as to whether or not the other party is of a specific model, and when it is confirmed that the other model is a specific model, self-information such as an ID is transmitted only. It is a thing.

<< Prior art and its problems >> To maintain security when connecting a personal computer to a telephone line via a modem device so that personal computers can perform data communication or open an electronic bulletin board. It is customary to respond to a line connection by an incoming call to confirm whether or not the incoming call is from a party permitted to communicate prior to data communication.

Conventionally, this type of modem device is not provided with such a function for confirming the other party, or even if it is provided, a function for simply transmitting self-information such as an ID, or an ID
It only had the function of receiving and collating.

According to this, when the communication partner does not have the ID collation function, the ID or the like is inadvertently transmitted until it is not necessary to transmit the ID or the like, which is a security problem.

<< Object of the Invention >> An object of the present invention is to solve the above problems.
An object of the present invention is to provide a communication device that prevents careless transmission of IDs and the like and transmits IDs and the like only when necessary.

<< Structure and Effect of the Invention >> In order to achieve the above object, the present invention provides at least self-information in a communication device that is provided between one or more information processing terminals and a public line and performs modulation / demodulation control of communication information. Information setting means capable of setting, and a transmitting means for transmitting the set self-information to the other party of communication,
Confirmation means for confirming whether or not the other party of communication is a specific model, and when the confirmation means confirms that the other party is a specific model, the transmitting means is operated and self-information is transmitted from the transmitting means. It is characterized in that it is provided with a transmission management means.

According to the present invention, the communication partner is inquired in advance as to whether it is a specific model or not, and when it is confirmed that the communication model is a specific model, the self-information such as the ID is transmitted for the first time. Therefore, if the other party can not be confirmed, the ID is not sent, that is, the problem that the ID is sent carelessly even when it is not necessary to send the ID is avoided, and the ID is stolen by this kind of careless ID sending. Can be prevented, and reliability can be improved in terms of security.

<< Description of Embodiments >> FIG. 1 is a hardware block diagram showing a modem device as an embodiment of a communication device according to the present invention.

As shown in the figure, this modem device is connected to a telephone line via a communication transformer 1 and connected to a data processing terminal (hereinafter referred to as DTE) 3 such as a personal computer via an RS-232C interface 2. To be done.

Between the communication transformer 1 and the DTE 3, a hybrid circuit 4,
A modem SLI5 and a full-duplex type serial IO port 6 are inserted in order.

The hybrid circuit 4 functions as a driver / receiver, and as is well known, the modem LSI 5 can be set with various functions by external control, such as switching of transmission speed and monitor speaker. 7, switching of echo for transmission data, setting of carrier disconnection time leading to line disconnection, and various other function settings are possible.

The serial IO port 6 is a full-duplex type, and in addition to the serial / parallel conversion function, it also controls whether to connect the modem LSI 5 to the DTE3 side (transparent mode) or the CPU side (command mode). Has been done.

A telephone can be connected to the telephone line via the current sensor 8, and the current sensor 8 detects when a telephone call is started or an incoming call is received.

The operation of this modem device is centrally controlled by a microcomputer including a CPU 9, a ROM 10 and a RAM 11.

That is, in the CPU9, via the serial port 6, the DTE3
In addition to receiving various commands from the parallel IO port 12
The switch SW for line connection is controlled to be turned on and off via the switch, and the start of the telephone call by the telephone is detected based on the signal from the current sensor 8.

Further, a signal CD indicating the start of data communication is sent (notified) to the DTE 3 via the parallel IO port 12.

Next, FIGS. 2A to 2C are flowcharts schematically showing the configuration of the control program executed by the CPU 9, and the operation of the apparatus of this embodiment will be systematically described with reference to these flowcharts. To do.

When the program is started by turning on the power, etc., first initialize various flags and registers (step
201), the input buffer for command storage from DTE3 is cleared (step 202).

Then, the incoming call detection based on the status of the parallel IO port 12 (steps 203 and 204) and the key input from the DTE 3 based on the status of the serial port 6 (step 20).
5,206) will be waiting.

In this state, when the key input from the DTE3 is detected (YES in step 206), the operation of sequentially writing the data input from the DTE3 into the input buffer is repeated until the CR code is input by the key (step 207NO). (Step 20
8).

After that, when the input of the CR code is confirmed (Step 207Y
ES), command determination processing is performed based on the data stored in the input buffer (step 209).

Then, it is determined whether the command input from the DTE3 is the automatic dial command ATDyyy ... y (step 210), the ID registration command ATJxxxxxx (step 211), or the ID exchange function setting command ATJ1 (step 212). Do.

Here, if the ID registration command is ATJxxxxxx (YES in step 211), as shown in FIG. 6, the input 1-digit command character and 5-digit ID number are stored in the battery-backed RAM 11 in the RAM 11. Transfer to a predetermined area (step 213).

If it is the ID exchange function setting command ATJ1 (YES in step 212), the flag j indicating the ID exchange function setting is set to "1".

In this way, one-digit command character, five-digit ID number and ID in the modem device according to the command from DTE3.
The flag j for setting the exchange function can be set respectively.

After that, when the automatic dial command ATDyyy ... y arrives from the DTE 3 (step 210 YES) or when an incoming call is detected via the parallel IO port 12 (step 20).
4YES), the process moves to FIG. 2B and the process when making a call or the process when receiving a call is started.

For convenience of description, FIG. 2B shows a case where two modem devices having similar functions are assumed and communication is performed between them.

That is, first, in the modem device on the calling side, the flag i indicating the J option is set to "0" (step 215).

This J option is set by the J option command command ATDyyy ... yJ in the same manner as step 212 in FIG. 2A, which means that even if the ID exchange function is not set, The ID exchange function is executed only once, so that the ID
When the other party uses the modem device having the ID exchanging function according to the present embodiment while communicating with the existing modem device having no exchanging function, by using this J option command, ID related to this embodiment
They are trying to exchange them.

Therefore, when the J option command ATDyyy ... yJ arrives from DTE3 (step 216 YES), the flag i is "1".
Is set (step 217).

Then, on the originating modem device, parallel IO port 12
Off hook information is set to turn on the switch SW (step 218), and then an automatic dial command is given to the modem LSI 5 (step 219).

On the other hand, the modem device on the called side sends off-hook information to the parallel IO port 12 in response to the dialing from the called side, thereby setting the switch SW1 to the ON state (step 232).

After that, as shown in FIG. 4, the modem LSI 5 transmits an answer tone and subsequently starts transmitting a carrier.

Then, the modem device on the calling side, after confirming the carrier from the called side, also starts transmitting the carrier to the other party.

In this way, when both sides transmit the carrier, each of the originating side and the receiving side modem device confirms the connection completion based on the status from the modem LSI (step 220, 221 or step 233, 234), and thereafter synchronizes both sides. Then, as shown in FIG. 4, the ID exchange operation is started.

At the beginning of the ID exchange operation, an inquiry INQ with a version number for confirming the other party's model is sent from the calling side (ORG) to the called side (ANS) by the data format shown in FIG. 7 (step 223). On the other hand, it waits for the arrival of the inquiry result IAN by the version number from the called side (step 224NO).

On the other hand, in the called modem, inquiry by version number
It waits for the arrival of INQ (step 236 YES), and if it arrives, returns the inquiry result IAN by the version number (step 238).

In this way, only when the identity of both models is confirmed based on the version number, the own ID is then sent from the calling side to the called side (step 22).
6).

In other words, this modem device inquires in advance whether or not the communication partner is a specific model, and when it is confirmed that the communication partner is a specific model, the self-information such as the ID is transmitted for the first time. It manages the transmission of self-information based on such confirmation. The above confirmation is performed based on whether or not the communication partner has the same partner confirmation function (ID exchange function) as the communication source.

Therefore, when the other party is a conventional model modem device that does not have the ID exchange function, it is sent from the calling side.
It is possible to reliably prevent the possibility that the ID number or the like is directly read by the other party's personal computer or the like and the person's own ID number is inadvertently known to the other party.

Also, after the inquiry INQ with the version number is performed from the calling side (step 223), if the inquiry result IAN is not received for a certain period of time thereafter, the monitoring timer times up (step 225 YES), and the line connection is immediately established. It can be cut off and waste of call charges can be saved.

Similarly, if the inquiry INQ with the version number is not received on the receiving side for a certain period of time or more, the monitoring timer expires (step 237YE
S), the line connection is cut off immediately, and the waste of call charges can be saved.

In particular, such an automatic shut-off function is effective for avoiding service deterioration due to long-term blocking of the line in the electronic bulletin board station.

If it is determined in step 222 or 235 that ID exchange is not necessary (step 22NO or 235NO), the state immediately shifts to the data communication state without performing ID exchange, and thus such an ID exchange function is provided. However, by omitting this, it is possible to communicate with the user using the modem device of the conventional model.

Next, when the confirmation of the partner's model is completed, the calling side introduces itself to the called side by sending an ID number (step 226), and then waits for an acknowledgment ACK from the partner (step 227).

On the other hand, on the called side that received the ID number (step 239YE
S), and confirms the other party by collating the own ID number with the ID number transmitted from the other party (step 24).
0).

At this time, in the device of the present embodiment, as the ID number of the receiving side,
By registering the specific code * in any digit of the 5-digit ID number, it is possible to allow the mismatch in the digit.

That is, as shown in the flowchart of FIG. 3A,
In this ID collation routine, first, the 5-digit ID number is collated one by one from the most significant digit or the least significant digit (steps 301NO, 302NO, 303YES, 304). ) Is not verified (step 303N
O), it is determined that the ID numbers do not match, the flag 1 is reset to "0" and the ID collation routine is terminated, whereas the digits marked with * on the receiving side (step 302 YES) are the same character, so The collation is skipped, and the next digit is collated immediately.

Then, only when it is confirmed that the collation matches for all the digits (YES in step 301), it is determined that the ID numbers match, and the flag 1 is set to "1".

Since such an ID collation routine is adopted, for example, when opening an electronic bulletin board station, if any digit is set as the specific code * in the receiving modem device, all the same for the user. Since it is not necessary to assign an ID number, it is possible to increase the number of parties that can be serviced by the electronic bulletin board station.

In addition, if it is possible to allocate several kinds of ID numbers to the calling party in this way, different services will be provided depending on the ID number sent, while maintaining some security. It is also possible.

In this way, when the ID matching process in the called modem device is completed (step 240), a receipt confirmation signal is immediately sent to the calling side (step 241).

On the other hand, if the receipt confirmation signal ACK arrives (step 227).
YES), and then the modem device on the calling side enters a standby state for detecting predetermined continuous data (NO in step 228).

On the other hand, after transmitting the reception confirmation signal (step 241), the modem device on the receiving side starts transmitting predetermined continuous data (step 242).

For this continuous data, for example, a character string having continuity such as 123123123 ... may be used.

When such continuous data is confirmed by the modem device on the outgoing side (step 228 YES), the continuous transmission of the continuous data is similarly started from the modem device on the outgoing side (step 22).
9).

On the other hand, if continuous data transmission from the other party is detected after starting continuous data transmission by itself (step 243YE
S), the modem device on the receiving side stops the continuous data transmitted by itself (step 244), and then waits until the continuous data transmission from the transmitting side is interrupted (step 245N).
O).

On the other hand, if continuous data loss from the receiving side is detected (YES in step 230), the transmitting side immediately stops transmitting continuous data (step 231), and in synchronization with this stop time, the data communication state, that is, the transparent mode is set. Transfer is performed (step 231).

On the other hand, if continuous data loss is detected (step 245Y
ES), the receiving side also shifts to the data communication state, that is, the transparent mode, in synchronization with the detection time.

In this way, steps 218-231 or steps
By passing through the protocols of 232 to 245, the transmitting side and the receiving side can shift to the data communication state almost at the same time as shown in FIG. 4, and the shift timing greatly deviates, and the ID information is stolen. It is possible to prevent the possibility of such problems.

In this way, when the transmitting side and the receiving side are synchronized, the ID matching flag l, in the device of the present embodiment, before shifting to the transparent mode for data communication.
Depending on the contents of the command character shown in FIG. 6, the subsequent operation is switched to one of several types.

That is, on-hook information is sent to the parallel IO port 12 immediately after it is determined that the ID numbers do not match as a result of the code collating process (step 246NO) (step 25).
8), the switch SW is turned off, the line connection is disconnected, and the CD signal is output from the parallel IO port 12 at the same time.
This allows the DTE3 side to detect the data communication failure.

On the other hand, when it is determined that the ID numbers match (step 246UES), the data communication mode (command character I), the post-data communication call mode (command character T), depending on the content of the command character, The call mode (command character S), remote maintenance mode (command character M), or remote control mode (command character R) is determined (steps 247, 248, 249, 250, 251).

If it is determined to be the data call mode (step 247Y
After the data communication, the call mode flag K after data communication is reset to "0" (step 252), information for turning on the CD signal for DTE is sent to the parallel IO port, and the start permission of data communication is notified by these. (Step 253).

Based on this CD signal, the DTE3 side can determine that the data communication may be started, and in the serial port 6, the connection switching between the DTE3 and the modem LSI5 is performed, and the so-called transparent mode is set. Settings are made.

After that, the data sent from DTE3 is serial port 6
It is sent to the modem LSI 5 via the inside and finally sent out to the telephone line. Further, the data coming from the telephone line can reach the DTE 3 via the modem LSI 5 and the serial port 6 (step 254).

After that, the CPU waits for the end of data communication (step 255 NO), and when the end of data communication is confirmed (step 2)
55YES), confirm that the flag k is not "1" (step 256 NO), set the flags i and k to "0" (step 257), then send the on-hook state to the parallel IO port and switch the switch SW. To the off state (step 25
8) The CD signal OFF information is sent to the parallel IO port (step 259), and the DTE 3 is notified of the end of the data signal (step 259).

On the other hand, if it is determined to be the call mode after data communication based on the content of the command character (step 248YE
S), after setting the flag k to "1", the processing from the sending of the CD signal to the confirmation of the end of the data communication is performed in the same manner as described above (steps 253 to 255), and following the confirmation of the end of the data communication (steps 253-255). When the flag k = "1" is confirmed (YES in step 255) (YES in step 256), the mode is changed to the call processing mode (step 261).

In this call mode process, as shown in FIG. 3B, first, a carrier off command is given to the modem LSI (step 3
07), followed by giving a monitor speaker output ON command to the modem LSI (step 308).

After that, while reading the status of the parallel IO port (step 309), it waits for the start of the call based on the output of the current sensor 8 (step 310NO).

After that, if the call start is detected (step 310YE
S), gives a command to turn off the monitor speaker output to the modem LSI (step 311), then detects the end of the call based on the status of the serial IO port (step 312) (step 313), and detects the end of the call. The mode processing routine ends (step 313 YES).

After that, the steps 257 to 259 described above are executed to end the program.

Further, when it is determined that the remote maintenance mode (step 250 YES) or the remote control mode (step 251 YES) is based on the content of the command character, the well-known remote maintenance processing (step 262) and Remote control processing (step 263) is performed. As a result, it becomes possible to perform remote maintenance of the counterpart modem device connected via the telephone line, or to perform on / off control of external equipment via the counterpart personal computer or the like.

As described above, if the modem device according to the present embodiment is provided on each of the transmitting side and the receiving side, the modem confirmation processing can be performed at high speed between the modems without bothering a data processing terminal such as a personal computer. Therefore, it is not necessary to incorporate the other party confirmation processing as software such as a personal computer, and it is possible to prevent the problem that the personal computer is inconvenienced each time due to a wrong call or a prank call.

In the above embodiment, the ID number is transmitted from the calling side to the called side, but instead of this, it may be sent from the called side to the calling side, or the ID numbers may be exchanged mutually. However, of course there are good things.

Further, in the above embodiments, the ID number exchange processing is performed both at the time of making a call and at the time of receiving a call. It will be easily understood that the number exchange function is sufficient.

[Brief description of drawings]

FIG. 1 is a block diagram showing the electrical hardware configuration of the device of the present invention, FIG. 2A is a flow chart centering on registration processing of ID numbers and the like, and FIG. 2B is centering on the protocol of ID exchange processing. Flow chart, FIG. 2C is a flow chart mainly showing switching of operation modes based on command characters, FIG. 3A is a flow chart showing an ID verification routine, FIG. 3B is a flow chart showing a call mode processing routine, and FIG. 4 is a data communication state. 5 is a time chart showing the timing of transmission / reception to arrive at, FIG. 5 is an explanatory diagram showing the procedure of ID exchange, FIG. 6 is a diagram showing the format of command characters and ID numbers, and FIG. 7 is a data format in the ordinary exchange. FIG. 8 and FIG. 8 are views showing the setting contents of the information field. 3 ... DTE 5 ... Modem LSI 9 ... CPU

Claims (3)

[Claims] 1. A communication device, which is provided between one or more information processing terminals and a public line and controls modulation / demodulation of communication information, at least information setting means capable of setting self information, and the setting. The sending means for sending self-information to the communication partner, the confirmation means for confirming whether the communication partner is a specific model, and the confirmation means confirming that the communication partner is a specific model. And a transmission management unit that activates the transmission unit to transmit self-information from the transmission unit. 2. The communication device according to claim 1, wherein the confirmation means confirms whether or not the other party of communication has the same confirmation means. 3. The communication device according to claim 1, further comprising a detection unit that confirms communication permission from the other party.