JPH03204794A - Ic card controlling method - Google Patents

Abstract

PURPOSE:To efficiently perform data transfer by designating the requirement of response of an IC card with a controller. CONSTITUTION:A code representing the requirement of response from the IC card 10 to the controller 20 is provided at a command signal, and the code in the command signal is recognized on the IC card 10, and a response signal is transmitted to the controller 20 when the response is required, and no response signal is transmitted when it is not required. In such a way, since it is possible to designate whether or not the response signal from the IC card 10 is required when the command signal is transmitted, wasteful response can be eliminated. Also, since plural IC cards 10 can be controlled simultaneously by requiring no response signal, the data transfer with high efficiency can be realized.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an IC card control method, and is particularly directed to an IC card suitable for transferring large-scale data and suitable for controlling a plurality of IC cards simultaneously. This invention relates to a card control method.

[Conventional technology]

As prior art related to the present invention, for example, Japanese Patent Application Laid-open No. 63
The invention described in Japanese Patent No. 120391 is mentioned.

This prior art discloses an IC card control method suitable for transferring a small amount of data or suitable for controlling a single IC card.

[Problem to be solved by the invention]

The following problems have been pointed out in the above conventional technology.

(1) When data is sent from the control device, as shown in FIG. 7, data is always sent back from the IC card to the control device, which does not improve transfer efficiency.

(2) In the conventional technology, since responses were always sent back, only a single IC card could be controlled, that is, one-to-one communication between the IC card and the control device was possible.

Therefore, when sending the same data to multiple IC cards, the same operation must be performed multiple times.
ineffective.

The prior art mentioned above does not recognize these problems.

The present invention was made in view of the problems of the prior art described above, and aims to provide an IC card control method suitable for increasing data transfer efficiency and controlling a plurality of IC cards simultaneously.

[Means to solve the problem]

The IC card control method of the present invention connects an IC card and a control device via a communication path, receives a command signal transmitted from the control device, and performs processing in the IC card according to the content of the command signal. In the card control method, a code indicating whether or not a response is required from the IC card to the control device is provided in the command signal, and the IC card recognizes the code in the command signal and sends a response signal to the control device when a response is required. It is characterized by transmitting a response signal and not transmitting a response signal if a response is not required.

[Effect]

Since it is possible to specify whether or not a response signal from the IC card is required when transmitting a command signal from the control device, unnecessary responses can be prevented.

Furthermore, since a plurality of IC cards can be controlled simultaneously by eliminating the need for a response signal, efficient data transfer can be realized.

〔Example〕

The present invention will be described in more detail below with reference to embodiments shown in the accompanying drawings.

FIG. 2 is a block diagram showing an example of an IC card to which the present invention is applied. In FIG. 2, 10 is an IC card body, 11 is a microprocessor, 12 is a communication interface, 13 is a power supply interface that supplies power to the IC card, and 14 is a random access memory (hereinafter referred to as RAM).
15 is a read-only memory (hereinafter referred to as ROM), and 16 is an electrically erasable programmable read-only memory (hereinafter referred to as EEPROM).

FIG. 2 is a block diagram showing a state in which the IC card 10 is connected to the control device 20, where 30 represents a communication path and 40 represents a power source path.

In FIGS. 2 and 3, all operations of the IC card 10 are controlled by a microprocessor 11, and when the microprocessor 11 is connected to the control device 20 as shown in FIG. Power is applied to the power supply interface 13, and the program existing in the ROM 14 shown in FIG. 2 is executed. Here, the IC card executes processing on the command signal received from the control device 20 via the communication path 30 and the communication interface 12, and returns the result to the control device 20 as a response signal.

Figures 1 (a), (b), and (c) show the control device 2.
FIG. 2 is an explanatory diagram showing an example of a command signal transmitted from IC card 10 to IC card 10. FIG. As shown in FIG. 1(a), the command signal consists of a command 101, a command type 102, and data 103.As shown in FIG. 1(b), the six commands 101 are of four types. exists, and one corresponding code is inserted as command 101.

In addition, as one type 102, as shown in FIG. 1(c), there are two types: a command signal requiring a response and a command signal not requiring a response.
A type exists, and one corresponding code is inserted as the type 102. Note that the data 103 shown in FIG. 1(a) is added only when the command 101 is "WRITE".

FIG. 4 ((Z), (b) is an explanatory diagram showing an example of a response signal transmitted from the IC card 10 to the control device 20. As shown in FIG. 4 (a), (b), There are two types of responses 401: L' OK ++ and "NG", and the corresponding codes are inserted as the responses 401. Also, the data 40 shown in FIG. 4(a)
2 is added only when the command 101 is "READ"' and the response 401 is "OK".

FIG. 5 is a processing flow of a main routine of a program that implements the functions of the IC card 1o stored in the ROM 15 shown in FIG. 1, and the operation of this embodiment will be explained using FIG. First, the microprocessor 11 of the IC card 10 waits for a command signal from the control device 20 (step 501). There are four types of command signals from the control device 20 as shown in FIG.
506), and each process is executed (steps 503, 505, 507, 508). After that, each processing result will be returned as a response signal, but if the type 102 in the message of the command signal received earlier is
(step 509), and if a response is required, an OK response is sent based on the processing result (step 51).
1) or return an NG response (step 512),
If no response is required, the process ends without sending anything back.

FIG. 6 is a sequence chart when this control method is followed, and when compared with FIG. 7, which is a conventional control method, it can be seen that fine control has become possible.

Furthermore, when a plurality of IC cards 10 are connected to the control device 20, by setting the type data 102 to not require a response, no response signal is sent back to the control device 20. Multiple ICs at once
It is possible to communicate with the card 10.

As described above, according to this embodiment, since the control device can freely instruct the presence or absence of a response, unnecessary response signals can be suppressed and efficient data transfer can be realized.

Furthermore, according to this embodiment, since a plurality of IC cards can be connected and controlled simultaneously to the control device, an efficient copy system or the like can be constructed.

〔Effect of the invention〕

According to the present invention, since it is possible to specify whether or not an IC card response is required from the control device, efficient data transfer is possible.

[Brief explanation of drawings]

FIGS. 1(a), (b), and (c) are explanatory diagrams showing an example of command signals sent from a control device to an IC card, FIG. 2 is a block diagram showing an example of an IC card, and FIG. 3 is a block diagram showing an example of an IC card.
The figure is a block diagram showing an example of the connection between the IC card and the control device, FIGS. 4(d) and (b) are explanatory diagrams showing an example of the response signal sent from the IC card to the control device, and FIG. ．． A flowchart showing a program stored in a ROM in a C card, FIG. 6 a time chart showing an example of a command signal and a response signal according to the present invention, and FIG. 7 a time chart showing an example of a command instruction and response according to the prior art. It is. 10: IC card, 11: Microprocessor, 12
: Communication interface, 13: Power supply interface
14: RAN, 15: ROM, 16: EEPROM, 20
: control device, 30: communication device, 40: power supply path. 7th (21 (z) Akira 7 mouth (C) departure) Tomoe Hakko (α) 4th 0 (b) I Tomoe

Claims (1)

[Claims] 1. An IC card that connects an IC card and a control device via a communication path, receives a command signal transmitted from the control device, and performs processing in the IC card according to the content of the command signal. In the control method, a code indicating whether or not a response is required from the IC card to the control device is provided in the command signal, the IC card recognizes the code in the command signal, and if a response is required, a response signal is sent to the control device. An IC card control method characterized by transmitting a response signal and not transmitting a response signal if a response is not required.