JPH0795667A - Data communication equipment - Google Patents

Abstract

PURPOSE:To enhance the security of data communication against copied equipments such as a learning remote controller copied illegally. CONSTITUTION:When an operation key of an operation section 11 is operated in a remote control unit 1, a random code selection section 12c selects a random number code in a random code table of a 1st memory 12a in response to a key operation time detected by a key operation time detection section 12b and the unit 1 used the random number code to set prescribed data comprising 1st and 2nd codes by a data setting section 12d and sends the data. Every time of the transmission, a 1st code in the data is updated to a 2nd code and the 2nd code is updated to a new random code. A reception control section 2 receives the data and a comparison discrimination section 21b compares and discriminates the coincidence between a memory code of a 2nd memory 12a and the received 1st code and a predetermined operation is controlled depending on the content of the received data when the 1st code and the memory code are coincident. Furthermore, a memory code update section 21c updates a preceding memory code stored in the 2nd memory into a new memory code when the 1st code and the memory code are coincident.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data communication device, and more particularly to a data communication device for preventing theft by a copying device such as a learning remote controller.

[0002]

2. Description of the Related Art There is a vehicle control system in which a door of a vehicle is locked and unlocked or an engine start is turned on / off by operating a key of a remote control unit. In a car equipped with such a remote control function, it helps prevent the car from being stolen, and even if you have a lot of luggage on hand, you can lock and unlock the door by simply pressing the key on the remote control unit, and from a remote location. The engine start can be turned on and off, which is convenient for warm-up operation.

In recent years, home automation has been put into practical use, and such a system is convenient because it is possible to control domestic automation equipment such as a rice cooker via a telephone line or the like while in a remote place.

[0004]

However, in a conventional system for transmitting control data to remotely control a controlled device, if the control data is decrypted by eavesdropping, the same data is used for theft or mischief. There was a risk of being In addition, in the conventional system, particularly in a system that locks and unlocks the door of a car, the remote control operation may accidentally control another vehicle, or conversely, the remote control operation of another vehicle may control one's own vehicle. There was a risk of it.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a data communication device capable of improving the safety of the data communication device against a duplication device such as a learning remote controller that has been illegally duplicated.

[0006]

According to the present invention, there is provided a data communication device for transmitting predetermined data from a first device to a second device, wherein the first device includes a plurality of codes. A first storage unit that stores a code table, an operation unit that includes a plurality of operation keys, a key operation time detection unit that detects a key operation time when the operation key of the operation unit is operated, and the key. A code selecting section for selecting a predetermined code from the code table stored in the first storage section according to the operation time, and a first code selected by the code selecting section.
A data setting unit that sets predetermined data composed of a first code and a second code using a code from the storage unit, and a code of the first code in the data set by the data setting unit each time transmission is performed. A data updating unit that updates the code of the second code and updates the code of the second code to a new code from the first storage unit selected by the code selecting unit, and the data input from the data setting unit. A second data transmission unit for transmitting data to the second device, wherein the second device has a data reception unit for receiving data from the first device and a data reception unit for receiving data from the data reception unit. A second storage unit for storing the second code in the storage unit as a storage code;
A comparison and determination unit that compares and compares the stored code stored in the second storage unit with the first code in the received data, and the first code and the stored code match according to the comparison and determination of the comparison and determination unit. An operation control unit for performing a predetermined operation control according to the content of the data received at the time, and a previous storage code stored in the second storage unit when the first code and the storage code match each other are received. It is achieved by having a storage code updating unit that updates to a new storage code.

[0007]

In the data communication apparatus having the above structure, the first apparatus stores the code table including a plurality of codes.
A code is provided from the code table stored in the first memory, which has a storage unit, detects a key operation time when an operation key of the operation unit is operated, and selects the code according to the key operation time. Select a predetermined code according to the section. And
The data setting unit sets predetermined data including the first code and the second code using the selected code of the first storage unit, and the data transmitting unit sets the data input from the data setting unit to the second device. Send to. Then, every time it is transmitted, the code of the first code in the data set by the data setting unit is updated to the code of the second code, and the code of the second code is changed to the new code selected by the code selecting unit. Update.

The second device receives the data from the first device, and compares the stored code stored in the second storage section with the received first code by the comparison and determination section to make a determination.
Predetermined operation control is performed according to the content of the data received when the first code and the stored code match according to the comparison determination of the comparison determination unit. Further, the memory code updating unit updates the previous memory code stored in the second memory unit to a new memory code received when the first code and the memory code match. Therefore, even if a copying device such as a learning remote controller is used during data communication and the transmitted data is copied, it is not possible to copy a remote control unit similar to the real one.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram of essential parts showing an embodiment of a data communication apparatus according to the present invention. First, the configuration will be described. 1 is a remote control unit, 2 is a reception control unit provided in a controlled device such as an automobile, and 3 is a door lock of the automobile.
This is a high-power control unit that performs unlock control and engine on / off control. In the remote control unit 1, reference numeral 11 denotes an operation unit, for example, an engine on key 11a for instructing to turn on engine start, an engine off key 11b for instructing to turn off engine start, a door lock key 11c for instructing door lock, and a door It has a door unlock key 11d for instructing to unlock. Reference numeral 12 is a control unit, which includes the first memory 12a and the key operation time detection unit
2b, random number code selection unit 12c, data setting unit 12d,
And a data updating unit 12e. Reference numeral 13 is a modulator for modulating transmission data, 14 is a transmitter, and 15 is a transmission antenna.

FIG. 2 shows an example of the transmission data structure. In this configuration example, the first block has an 8-bit first code (ID
Code), and an 8-bit second code (memory code) is arranged in the second block, and an 8-bit command code corresponding to each operation key of the operation unit 11 is added to the third block during transmission. FIG. 3 is an example of a command code forming the transmission data. For example, when the engine on key 11a of the remote control unit 1 is pressed, a command code (00000001) meaning engine start on is added.

FIG. 4 is an explanatory diagram for explaining an example of random number code selection in the transmission unit 1. Referring to FIG. 4, when any operation key of the operation unit 11 of the transmission unit 1 is pressed, the key input changes from L (Low) to H (H).
It becomes "high" and becomes L again when it is released. Then, the key operation time detection unit 12b samples this key input section at a predetermined cycle from the time of pressing, and detects 1 as sampling data when the key input is H and 0 when it is L. Therefore, the random number code selection unit 12c selects a random number code corresponding to the sampling number from the random number code table stored in the first memory 12a according to the detected sampling number.

FIG. 5 is a random number code table stored in advance in the first memory 12a. In FIG. 5, for example, if the number of samplings detected by the key operation time detection unit 12b in the above random number code selection is 8, the random number code selection unit 1
2c from the random number code table to the random number code (010101
01) is selected.

Now, the control unit 12 will be described in detail. The first memory 12a stores a random number code table composed of a plurality of random number codes, and the key operation time detecting unit 1
2b detects the key operation time when the operation key of the operation unit 11 is operated. Regarding key operation time detection,
Since it has been described with reference to FIG. The random number code selection unit 12c selects a predetermined random number code from the random number code table stored in the first memory 12a according to the key operation time of the operation unit 11. Then, the data setting unit 12d uses the first memory 1 selected by the random number code selecting unit 12c.
Predetermined data composed of the first code and the second code is set using the random number code from 2a. Data updating unit 12e
Each time it is transmitted, the random number code of the first code in the data set by the data setting unit 12d is updated to the random number code of the second code, and the random number code of the second code is selected by the random number code selecting unit 12c. The new random number code from the first memory 12a is updated.

In the reception control unit 2 of the controlled device, 21 is a control unit, which has a second memory 21a, a comparison / determination unit 21b, and a memory code updating unit 21c. Further, 22 is a receiving antenna, 23 is a receiving section for receiving predetermined data from the remote control unit 1, 24
Is a demodulator for demodulating data from a received signal.

Here, the control unit 21 will be described in detail. The second memory 12a stores the second data in the received data.
Store the code as a memory code. Comparison determination unit 21
b compares and judges the match between the memory code stored in the second memory 21a and the first code in the received data, and outputs an operation command to the operation control unit described later. Also,
The memory code updating unit 21c updates the previous memory code stored in the second memory 21a to the new received memory code (second code) when the first code and the memory code match.

The high-voltage control unit 3 controls the predetermined operation according to the content of the data received when the first code and the memory code match according to the comparison judgment of the comparison judgment unit 21b, and locks the door of the automobile. A door lock control unit 31 that controls unlocking / locking, an engine start control unit 32 that controls on / off of engine start, and a horn control unit 33 that controls ringing of the horn. The horn control unit 33 is controlled by an ON / OFF key (not shown) of the reception control unit 2 and is made to ring in synchronization when the door is locked / unlocked, for example.

FIG. 6 is an explanatory diagram for explaining an example of data transmission. Referring to FIG. 6, for example, in the first transmission, the data setting unit 12d is selected by the random number code selecting unit 12c from the random number code table stored in the first memory 12a according to the key operation time. Using the random number code (10100110) as the first code,
Similarly, the second code has the same random number code (1010011).
0). And the first code is the ID code,
The second code is used as a memory code. In the first transmission, in this embodiment, the random number code from the first memory 12a is used and the first code and the second code are the same code, but the first code is set to a code different from the second code in advance. Alternatively, the same code as that code may be set in advance as a receivable code on the controlled device side.
Then, at the time of the second transmission, the first code (10100110) of the first time is changed to the second code (10
100110) and the second code (1010011)
0) is a new random number code (01
00000)). Further, at the time of the third transmission, the first code (10100110) of the second time is updated to the second code (01000001) of the second time, and the second code (10100110) of the second time is stored in the first memory. New random number code from 12a (011110
Update to 10). As described above, since the above processing is repeated during transmission, random transmission is possible.

FIG. 7 is an explanatory diagram for explaining the data transmission / reception state of the data communication apparatus according to the present invention.
With reference to FIG. 2, data setting and exchange between the remote control unit 1 and the reception control unit 2 in the data communication apparatus of FIG. 1 will be described in detail. First, when the user first presses any operation key of the operation unit 11 of the transmission unit 1, the key operation time detection unit 12b samples the key operation time, and the random number code selection unit 12c determines the first operation time according to the sampling number. A random number code corresponding to the sampling number is selected from the memory 12a. Then, the data setting unit 12d sets transmission data using the random number code. The transmission data setting has been described with reference to FIG. 6, and will not be repeated here.

Now, referring to FIG. 7, for example, the third transmission / reception will be described. In the third transmission data structure, the first code (ID code) is (01000001) and the second code is second.
The code (memory code) is (01111010). Therefore, the control unit 12 controls the first code and the second code.
A command code corresponding to the operation key as described in FIG. 3 is added to the code as transmission data, and the data is transmitted to the reception control unit 2 via the modulation circuit 13, the transmission unit 14, and the transmission antenna 15.

Therefore, when the control unit 21 of the reception control unit 2 receives the transmission data from the transmission unit 1 via the reception antenna 22, the reception unit 23, and the demodulation unit 24, the comparison / determination unit 21b of the control unit 21 receives the transmission data. The second possible code
The memory code (01000001) received from the memory 21a at the second time is read as an ID code,
A comparison / determination process is performed to determine whether or not the first code (ID code) in the received transmission data matches. However, during the first reception, ID code coincidence is ignored without making a comparison judgment,
Consider a match. That is, the second determination is made by the comparison / determination unit 21b.
It can be accepted when the memory code (ID code) read from the memory 21a matches the first code (ID code) in the transmission data.

Further, if the ID code is the same in the third reception, the control unit 21 updates the memory code updating unit 21.
The previous memory code stored in the second memory 21a is updated by c to the second code (memory code) in the new third transmission data. Hereinafter, the same update process is repeated every time the ID code matches.

Next, description will be given of a case where the button is pressed by the air.
For example, it is assumed that the fourth time, the fifth time, and the sixth time are pressed empty and the normal transmission is performed at the seventh time. Here, referring to FIG. 7, the first code of the transmission data is (100110
11) and the second code is (01011010). On the other hand, the reception control unit 2 continues to store the memory code (01111010) transmitted for the third time. Therefore, since it does not match the first code (10011011) of the transmission data, it is not accepted. Therefore, the remote control unit 1 stores a predetermined number of transmitted transmission data,
For example, if the operation key is kept pressed, the past transmission data stored in the first memory 12a is transmitted in order. That is, the data is sent back to the fourth transmission data.

FIG. 8 is a flow chart of processing of the control unit 12 of the remote control unit 1 in the data communication apparatus according to the present invention. The operation of the remote control unit 1 will be described with reference to this flowchart. First, when the user first presses the operation key of the operation unit 11 and a key input corresponding to the key is input to the control unit 12 (step 101), the control unit 12
The operation key time detector 12d samples the operation key time. Then, the random number code selection unit 12c selects a random number code corresponding to the detected sampling number from the random number code table of the first memory 12a (step 10).
2).

Therefore, the control unit 12 has the data setting unit 12d.
Then, the selected random number code is fetched from the first memory 12a (step 103). Then, the data updating unit 12
By e, the first code of the transmission data stored in the first memory 12a is updated to the second code, and the second code is updated to the newly selected random number code (step 10).
4). Therefore, the updated and set first code and second code
A command code corresponding to the operation key is further added to the code to set transmission data (step 105). Then, the control unit 12 transmits the set transmission data to the modulation unit 13,
The data is transmitted to the controlled device side via the transmission unit 14 and the transmission antenna 15, and the transmission data is stored in the first memory 12a (step 106).

FIG. 9 is a flow chart of processing of the control unit 21 on the controlled device side in the data communication device according to the present invention. The operation of the control unit 21 on the controlled device side will be described with reference to this flowchart. First, assuming that the operation key of the operation unit 11 of the transmission unit 1 is pressed by the user, the transmission data is transmitted from the transmission unit 1, and the control unit 21 causes the reception antenna 22, the reception unit 23, and the demodulation unit 24 to intervene. When the transmission data is received (step 201), the control unit 21
The comparison / determination unit 23b reads the first code, the second code, and the command code in the transmission data (step 20).
2).

Therefore, the comparison / determination unit 23b is operated by the second memory 2
The memory code stored in 1a is read (step 203), the read memory code is set as an ID code (step 204), and the set ID code matches the received first code (ID code). Whether or not there is a comparison is determined (step 205). If they match, the previous memory code of the second memory 21a is updated to a new memory code, and an operation command corresponding to the command code is output (step 20).
6). If the first code in the transmission data does not match the memory code stored in the second memory 21a in step 205, the operation command is not accepted (step 2).
07).

Therefore, even if the transmission data signal is copied by the duplication device by the thief, the transmission data content is different each time it is transmitted, so that the thief cannot control the controlled device side. Although the embodiment refers to the on-vehicle data communication device, it can be applied to a home data communication device and the like. Further, the transmission / reception may be optical, wired, or the like in addition to wireless as a medium. Although each code is 8 bits, the number of bits may not be 8 bits.

[0028]

As described above, according to the present invention, the first device is provided with the first storage section for storing the code table composed of a plurality of codes, and when the operation key of the operation section is operated, that key is operated. The operation time is detected, a predetermined code is selected by the code selection unit from the code table stored in the first storage unit according to the key operation time, and the selected code in the first storage unit is used. The predetermined data including the first code and the second code is set by the data setting unit, and the data transmission unit transmits the data input from the data setting unit to the second device and sets the data each time the data is transmitted. The code of the first code in the data set by the unit is updated to the code of the second code, the code of the second code is updated to the new code selected by the code selection unit, and the second device , First device These data are received, the comparison determination unit compares and determines whether the stored code stored in the second storage unit and the received first code match, and the comparison determination unit compares the first code and the stored code. When the stored code update unit performs a predetermined operation control according to the content of the received data when the data matches, and when the stored code update unit receives the previous code stored in the second storage unit when the first code and the stored code match. Since the new stored code can be updated, even if a copying device such as a learning remote controller is used during communication and the transmitted data is copied, a remote controller unit similar to the real one cannot be copied.

[Brief description of drawings]

FIG. 1 is a principal block diagram showing an embodiment of a data communication apparatus according to the present invention.

FIG. 2 is an example of a transmission data structure.

FIG. 3 is an example of a command code forming transmission data.

FIG. 4 is an explanatory diagram for explaining an example of random number code selection in the transmission unit 1.

FIG. 5 is a random number code table stored in a first memory 12a.

FIG. 6 is an explanatory diagram illustrating an example of data transmission.

FIG. 7 is an explanatory diagram for explaining a data transmission / reception state of the data communication device according to the present invention.

FIG. 8 is a flowchart of processing of the control unit 12 of the remote control unit 1 in the data communication device according to the present invention.

FIG. 9 is a flowchart of the process of the control unit 21 on the controlled device side in the data communication device according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Remote control unit 11 Operation part 12 Control part 12a First memory 12b Key operation time detection part 12c Random code selection part 12d Data setting part 12e Data update part 13 Modulation part 14 Transmission part 2 Reception control part 21 Control part 21a Second memory 21b Comparison / determination unit 21c Memory code updating unit 23 Receiving unit 24 Demodulating unit 3 High voltage control unit

Claims (1)

[Claims] 1. A data communication device for transmitting predetermined data from a first device to a second device, wherein the first device includes a first storage section for storing a code table including a plurality of codes. An operation unit including a plurality of operation keys, a key operation time detection unit that detects a key operation time when the operation key of the operation unit is operated, and a storage in the first storage unit according to the key operation time. A code selecting section for selecting a predetermined code from the code table stored in the table and a code from the first storage section selected by the code selecting section is used to generate predetermined data including the first code and the second code. The data setting section to be set and the code of the first code in the data set by the data setting section is updated to the code of the second code each time the data is transmitted, and the code of the second code is selected by the code selecting section. The first note The data updating unit that updates the new code from the storage unit, and the data transmitting unit that transmits the data input from the data setting unit to the second device, the second device is the first device. A data receiving section for receiving data from the device, a second storage section for storing a second code in the data received by the data receiving section as a storage code, and a second storage section stored in the second storage section. A comparison determination unit that compares and compares the stored code with the first code in the received data, and the content of the data received when the first code and the stored code match by the comparison determination of the comparison determination unit. And an operation control section for performing a predetermined operation control according to the above, and a memory for updating the previous storage code stored in the second storage section to a new storage code received when the first code and the storage code match. Code update section Data communication apparatus characterized by having a.