JP2543861B2 - Data transmission method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial field of application) The present invention transfers data between an IC card and a card reader / writer by half-duplex transmission. The present invention relates to a data transmission method in which an IC card decodes command data by receiving the command data, executes processing of the decoded command data, and then transmits the processing result as response data to a card reader / writer.

(Prior Art) A first electronic device and a second electronic device exchange data by half-duplex transmission, and a control signal in the second electronic device is activated by a reset signal from the first electronic device. Then, after that, the second electronic device receives and decodes the command data from the first electronic device, executes the process corresponding thereto, and then the result of the process is sent to the first electronic device as response data. There is a processing system that sends.
This processing system operates normally when the transmission protocol of the first electronic device and the second electronic device are known.

As an application example of such a processing system, recently, IC
The system using a card is raised. Here, the transmission protocol of the IC card differs depending on the model. For this reason, the IC card informs the external card reader / writer of the transmission protocol, etc., and after recognizing the reset release by the reset signal, the answer to reset (Answer
The initial response data called "to Reset" is transmitted. After that, the IC card waits for command data.

In this state, when the instruction data is received from the outside, the IC card decodes the instruction data, executes the processing corresponding to this, sends the processing result to the outside as the response data, and waits again for the instruction data. Become. In this case, the time required to wait for the next command data after sending the response data also differs depending on the model.

However, since there is no means to recognize the above difference in time,
The card reader / writer for prompting processing to the IC card must set the time from receiving the response data to sending the command data by using the maximum value of the above time between each model. However, there is a drawback in that it is not possible to control the timing of sending the appropriate command data for each IC card model.

(Problems to be Solved by the Invention) As described above, the card reader / writer determines the difference in the time from receiving the response data corresponding to the instruction data to transmitting the next instruction data due to the difference in the IC card model. Since it cannot be recognized, the card reader / writer has a drawback in that the timing of sending the appropriate command data cannot be adjusted for each IC card model.

Therefore, the present invention eliminates the above-mentioned drawbacks.
The read reader / writer can recognize the difference in the time from receiving the response data corresponding to the command data depending on the model of the card until sending the next command data, and the card reader / writer is appropriate for each IC card model. It is an object of the present invention to provide a data transmission method capable of timing the sending of command data.

[Structure of the Invention] (Means for Solving the Problems) In the data transmission method of the present invention, data is transferred between the IC card and the card reader / writer by half-duplex transmission. In the data transmission method, in which the IC card decodes the command data by receiving the command data, executes the processing of the decoded command data, and then transmits the processing result as response data to the card reader / writer, wherein the IC card is A step of outputting, to the card reader / writer, temporal information up to a state where the next command data can be received from the card reader / writer after receiving the response data,
In the card reader / writer, counting the time after receiving response data from the IC card based on the temporal information received from the IC card; and in the card reader / writer, the count time is the IC And transmitting the next command data to the IC card after the time information received from the card has elapsed.

(Function) The above-mentioned temporal information output by the IC card is read by the card reader /
When the writer receives, the difference in the time from the reception of the response data corresponding to the instruction data due to the difference in the IC card model to the transmission of the next instruction data
Writer can recognize. Therefore, the card reader / writer can properly send the command data for each IC card model.

(Example) Hereinafter, one example of the present invention will be described with reference to the drawings.

FIG. 8 shows a configuration example of a card handling device to which the IC card according to the present invention is applied and which is used as a terminal device such as a home banking system or a shopping system. That is, this device enables the IC card 1 to be connected to a control unit 3 including a CPU via a card reader / writer 2 as a card processing device, and the control unit 3 includes a car board 4, a CRT display device 5, The printer 6 and the floppy disk device 7 are connected to each other.

The IC card 1 is held by the user and refers to a personal identification number known only to the user when the user purchases a product, for example, and stores necessary data. The functional blocks are shown in FIG. In addition, it is composed of a portion for executing basic functions such as a read / write unit 11, a password setting / password collating unit 12, and an encryption / decryption unit 13, and a supervisor 14 for managing these basic functions. Read / write section 11
Reads data from the card reader / writer 2,
This function is for writing or erasing. Password setting
The password collating unit 12 has a function of storing and reading out a password set by the user, collating the password after setting the password, and granting permission for the subsequent processing. The encryption / decryption unit 13 encrypts or prevents encrypted data from being leaked or forged when transmitting data from the control unit 3 to another terminal device via a communication line, for example. Is for compounding,
For example, it is a function of performing data processing according to an encryption algorithm having sufficient encryption strength such as DES (Data Encryption Standard). The supervisor 14 is a function for decoding a function code or a function code added with data input from the card reader / writer 2 and selecting and executing a necessary function from the basic functions.

In order to exert these various functions, the IC card 1 has a control element (for example, CPU) 1 as shown in FIG.
5, non-volatile data memory 16 that can erase the stored contents,
It comprises a program memory 17 and a contact portion 18 for obtaining electrical contact with the card reader / writer 2, of which portions within the dashed line (the control element 15,
The data memory 16 and the program memory 17) are composed of one IC chip. The program memory 17 is composed of, for example, a mask ROM, and as shown in FIG. 4, the control element 15 having a subroutine for realizing each of the basic functions described above.
The control program and the initial response data that means the start of activation of the IC card 1 are stored. It is used to store various data in the data memory 16, and is composed of, for example, an EEPROM.

The card reader / writer 2 exchanges function codes and data between the IC card 1 and the control unit 3. Specifically, as shown in FIG. 7, a transport mechanism 21 for transporting the IC card 1 inserted into a card insertion slot (not shown) to a predetermined position, and a contact portion 18 of the IC card 1 set at the predetermined position. A contact portion 22 that is electrically contacted with a control circuit 23 including a CPU that controls the entire control
The input / output interface circuit 24 for exchanging command data and response data between the control unit 3 and the control unit 3, the data memory 25 for storing the data, and the initial value are given. , And a decrement timer circuit 26 and the like.

Next, the operation in such a configuration will be described. First, the IC card 1 operates according to the flowchart shown in FIG. That is, when the reset signal, which is the activation control signal from the card reader / writer 2, is set to the reset release state, the control element 15 outputs the initial response data which means the activation start in the program memory 17 within a predetermined time. The initial response data is composed of transmission protocol specification information of the IC card 1 and time information until the next instruction data from the card reader / writer 2 is accepted after the response data corresponding to the instruction data is output. Has been done. After outputting the initial response data, the control element 15 waits for command data from the card reader / writer 2. At this time, when the command data is input from the card reader / writer 2, the control element 15 executes the basic function according to the command data, outputs response data indicating the processing result to the card reader / writer 2, and again. Return to the instruction data wait state.

The command data output from the card reader / writer 2 to the IC card 1 has a format as shown in FIG. 3, for example, as shown in FIG. There is a form in which data is added to the function code as shown in b).

The card reader / writer 2 operates according to the flowchart shown in FIG. That is, in the steady state, it is in a state of waiting for command data from the control unit 3 (step S1). At this time, when the instruction data is input from the control unit 3, the control circuit 23 proceeds to step S2 and determines whether the input instruction data is an IC card take-in instruction. If the command is an IC card take-in command, the control circuit 23 proceeds to step S3 and waits for an IC card insertion. At this time, when it is determined that the IC card 1 is not inserted within the predetermined time, the control circuit 23 proceeds to step S4, outputs response data indicating that the IC card has not been inserted to the control unit 3, and waits again for the instruction data. Return. When it is determined that the IC card 1 is inserted within the predetermined time, the control circuit 23 proceeds to steps S5 and S6 to supply power and clock to the IC card 1 and release the reset of the IC card 1 (hereinafter, these Operation is called activation). Then, the control circuit 23
Proceed to S7, and enter the waiting state for initial response data, which means the start of activation from the IC card 1. At this time, if the initial response data is not received within the predetermined time, the control circuit 23 proceeds to step S8, outputs the response data indicating the nonstandard card to the control unit 3, and returns to the command data waiting state again. When the initial response data is received within the predetermined time, the control circuit 23 proceeds to step S9
To extract the temporal information in the received initial response data and build in RAM (random access memory)
To be stored.

Next, the control circuit 23 proceeds to step S10 and determines whether the instruction data from the control unit 3 is a macro instruction.
If it is not a macro instruction, the control circuit 23 proceeds to step S11, outputs response data to the instruction data to the control unit 3, and returns to the instruction data waiting state again. If it is a macro instruction, the control circuit 23 proceeds to step S12 to determine whether or not the macro instruction is completed (final instruction data in the macro instruction is the IC card 1
Or not). When the macro command is completed, the control circuit 23 proceeds to step S11 to output the response data for the macro command to the control unit 3 and returns to the re-command data waiting state. If it is not the end of the macro instruction, the control circuit 23
Advances to step S13 and waits until the decrement timer circuit 26 becomes "0". When the decrement timer circuit 26 becomes "0", the control circuit 23 proceeds to step S14.
Then, the command data to be sent is output to the IC card 1. Then, the control circuit 23 proceeds to step S15 and waits for the response data from the IC card 1. At this time, if the response data from the IC card 1 is not received within the predetermined time,
The control circuit 23 proceeds to step S16, outputs response data indicating time-out to the control unit 3, and returns to the instruction data waiting state again. When the response data from the IC card is received within the predetermined time, the control circuit 23 proceeds to step S17, and the time information stored in the RAM is decremented by the decrement timer circuit.
Set to 26 as the initial value. Then, the control circuit 23 returns to step S10 and repeats until all macro instructions are completed.

If it is determined in step S2 that it is not the IC card take-in command, the control circuit 23 proceeds to step S18 and
Or not after activating. Unless after the activation of the IC card 1, the control circuit 23 proceeds to step S19,
The response data indicating inactivation is output to the control unit 3 and the state returns to the instruction data waiting state again. If the IC card 1 has been activated, the control circuit 23 moves to step S13.

In this way, by including in the initial response data the time information from when the IC card 1 sends the response data corresponding to the instruction data until it receives the next instruction data,
The card reader / writer 2 extracts the temporal information from the initial response data, and based on the extracted temporal information, IC
The timing of sending command data to the card 1 can be recognized.
That is, after the card reader / writer 2 receives the above-mentioned temporal information output by the IC card 1 together with the initial response data, the response data corresponding to the instruction data due to the difference in the model of the IC card 1 is received by the temporal information. The card reader / writer 2 can recognize the difference in time from when the next command data is transmitted. Therefore, the card reader / writer 2 can appropriately send the command data for each model of the IC card 1 based on the time information.

In the above-described embodiment, the temporal information in the initial response data is extracted, set as the initial value in the decrement timer circuit 26, and the decrement timer circuit 26 immediately before the instruction data is sent to the IC card 1. Although the method of confirming that it has become "0" has been described, if the decrement timer circuit 26 becomes "0" after setting the time information,
It may be a direction to move to step S10. That is, the process of step S13 may be performed between steps S17 and S10. In this case, the decrement timer circuit 26
May be realized by a soft timer having the same model as the hard timer, instead of the hard timer.

Further, in the above embodiment, the temporal information is registered in advance by being included in the initial response data, but the information other than the temporal information in the initial response data and the temporal information are separately registered. Alternatively, a method of combining the two at the time of sending may be used. Further, the temporal information is registered separately from the initial response data, and the temporal information is output as response data in response to the temporal information request command data from the card reader / writer 2. May be.

[Effects of the Invention] As described in detail above, according to the present invention, the difference in the time from the reception of the response data corresponding to the instruction data to the transmission of the next instruction data due to the difference in the model of the IC card Writer can be recognized, card reader / writer is IC
It is possible to provide a data transmission method in which an appropriate command data transmission timing can be achieved for each card model.

[Brief description of drawings]

The drawings are for explaining one embodiment of the present invention. FIG. 1 is a flow chart for explaining the operation of a card reader / writer, FIG. 2 is a flow chart for explaining the operation of an IC card, and FIG. 3 is a card reader.・ A diagram showing the format of the instruction data output from the writer, Fig. 4 shows the format in the program memory of the IC card, and Fig. 5 shows the IC.
FIG. 6 is a block diagram showing the configuration of an IC chip built in the card, FIG. 6 is a diagram showing functional blocks of the IC card, FIG. 7 is a block diagram showing the configuration of a card reader / writer, and FIG. 8 is a configuration of a card handling device. It is a block diagram showing. 1 …… IC card, 2 …… Card reader / writer, 15 ……
Control element (CPU), 16 ... Data memory, 17 ... Program memory, 23 ... Control circuit, 26 ... Decrement timer circuit.

Claims (1)

(57) [Claims] 1. An IC card reader / writer connected to a control unit of a terminal device for outputting a command to an IC card transmits a command transmitted from the control unit of the terminal device to the IC card by half-duplex transmission. Card, and the IC card
The instruction data is decoded by receiving the instruction data from the control unit of the terminal device via the reader / writer, the processing of the decoded instruction is executed, and then the processing result is used as response data via the card reader / writer. A method for transmitting data to a device, comprising: a first step of transmitting a command to output time information to the IC card in the IC card reader / writer, and the IC card in response to the first step. Receives the instruction data from the IC card reader / writer, decodes the instruction data, executes the instruction processing, transmits the processing result as response data, and then the IC card transmits the next instruction data.
The second step of sending time information to the IC card reader / writer until it can be received from the IC card reader / writer, and the time information output from the IC card in the IC card reader / writer to a memory. A third step of storing, a fourth step of receiving a command from the control unit of the terminal device after storing the time information in the memory in the IC card reader / writer, and a terminal device of the terminal device in the IC card reader / writer. A fifth step of transmitting the command data to the IC card when a command from the control unit is received, and a sixth step of receiving response data from the IC card to the command data in the IC card reader / writer, When the IC card reader / writer receives response data from the IC card for the command data Serial
After setting the time information received from the IC card and stored in the memory in the timer, return to the fourth step.
In the step and the IC card reader / writer, it is judged whether the time sent from the IC card has passed or not by the value of the timer set in the seventh step, and as a result of this judgment, it is sent from the IC card. An eighth step of transmitting the next command data received from the control unit of the terminal device in the fourth step to the IC card when the time has elapsed, the data transmission method.