JP2002236885A - Ic card reader/writer and data transmission method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an IC card reader/writer and a data transmission method therefor capable of coping with an RW command based on different transmission protocols transmitted from a host computer. SOLUTION: The IC card reader/writer is connected to the host computer 3, and operates on the basis of the RW command received from the host computer 3, and has a receiving means 11 for receiving the RW command based on the first transmission protcol or the second transmission protcol different from the first transmission protcol from the host computer 3, a determining means 12 for determining on which of the first transmission protcol or the second transmission protcol the RW command received by the receiving means is based, and a first converting means 13 for converting the RW command so as to be based on the first transmission protcol when the determining means 12 determines that the RW command is based on the second transmission protcol.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an IC card reader / writer for reading or writing information from / to an IC card and a data transmission method thereof, and more particularly, to receiving an RW command based on different transmission protocols transmitted from a host computer. And a data transmission method thereof.

[0002]

2. Description of the Related Art An IC card is a card-type storage medium having a size of about a business card having a built-in IC memory, and is expected to be applied to, for example, a credit card and a commuter pass. I
Some C cards have a built-in CPU. I
Reading of information stored in the C card and writing of information to the IC card are performed through an IC card reader / writer. The IC card reader / writer is connected to a host computer, which is a host device of the IC card reader / writer, and various main processes are executed by the host computer.

[0003] Reading and writing of information from and to an IC card utilizes an electromagnetic induction phenomenon between a coil in the IC card and an information transmitting / receiving section of an IC card reader / writer. An IC card reader / writer is a contact type IC that inserts an IC card into an IC card insertion slot provided in an IC card reader / writer body and transmits / receives information to / from the IC card.
Non-contact type I that transmits and receives information via an antenna provided on a C card reader / writer and an IC card reader / writer
It is roughly divided into C card reader / writer.

FIG. 5 is a schematic diagram of an IC card system. For simplicity of explanation, in this figure, IC
The card reader / writer 1 is compatible with both contact type and non-contact type IC cards 2. IC card 2
It is activated and accepted by being inserted into the IC card insertion slot 4 of the IC card reader / writer 1 or being held over the vicinity of the antenna 5. When reading various information stored in the IC chip in the activated IC card 2, the IC card reader / writer 1 transmits the read information to the host computer 3 connected as a host device for the IC card reader / writer 1. I do. Then, various processes are executed in the host computer 3. The information from the host computer 3 after various processes is
The data is written to the IC card 2 by the C card reader / writer 1.

[0005] Commands transmitted and received by such an IC card reader / writer include a command to an accepted IC card (hereinafter referred to as an "IC command") and a command from a host computer connected to the IC card reader / writer as an upper model. (Hereinafter referred to as “RW command”). As a transmission protocol for performing communication between the IC card reader / writer and the IC card, for example, PC / SC (Personal Computer)
r = 1 (half-duplex start-stop synchronous block transmission protocol) or T = 0 (start-stop half-duplex character transmission protocol) of ISO-IPC7816, which is a rule of the r / Smart Card working group, is generally used. ing. In Japan, JICSAP (Japan
n IC Card System Applicat
ion Protocol)
= 1 is widely used.

[0006]

However, there is no protocol for a transmission protocol for performing communication between the IC card reader / writer and the host computer so far. Therefore, there are various transmission protocols between the IC card reader / writer and the host computer.

[0007] Under such circumstances, the interface for the IC card reader / writer in the host computer is affected by the transmission protocol of the RW command to be used, which is a constraint in constructing the system. The present applicant has proposed a simple RW command (hereinafter, referred to as “unique RW command”) conforming to the command format defined by JICSAP as an RW command between the IC card reader / writer and the IC card. This facilitates the construction of an interface for an IC card reader / writer in the host computer.

However, in order to further increase the versatility of the IC card reader / writer, if it is intended to be able to process RW commands based on the transmission protocol T = 1 in addition to the original RW commands, the protocol will be used in the first place. Since the format is different, it is necessary to separately prepare a logic circuit for executing command processing in the IC card reader / writer for each RW command, and there is a problem that the use efficiency of the firmware in the IC card reader / writer deteriorates.

Accordingly, an object of the present invention is to solve the above problems,
An object of the present invention is to provide an IC card reader / writer operable in response to a received RW command based on a different transmission protocol in communication with a host computer connected as a host device, and a data transmission method thereof.

[0010]

According to the present invention, in order to achieve the above object, the present invention is connected to a host computer, operates based on an RW command received from the host computer, and transmits and receives data to and from an IC card. The receiving IC card reader / writer performs a receiving unit that receives an RW command based on the first transmission protocol or a second transmission protocol different from the first transmission protocol from a host computer, and the RW command received by the receiving unit is a first transmission protocol. Determining means for determining whether the RW command is based on the second transmission protocol or the second transmission protocol. If the determination means determines that the RW command is based on the second transmission protocol, the RW command is determined as the first transmission protocol. First conversion means for performing conversion based on

Specifically, in the present invention, the IC
The card reader / writer has a first transmission protocol having a first identifier in a first predetermined byte in a first field which is a header, or an information field having no first field and in the case of the first transmission protocol. Second in
Receiving means for receiving an RW command based on a second transmission protocol having a second identifier to be present in the predetermined byte at a position corresponding to the first predetermined byte in the case of the first transmission protocol; Determining the identifier present in the first predetermined byte with respect to the received RW command, and adding the first field to the RW command when the determining unit determines that the second identifier exists. Means.

In the present invention, the data transmission method of the IC card reader / writer is a method for receiving from a host computer an RW command based on a first transmission protocol or a second transmission protocol different from the first transmission protocol. Step and RW received by the receiving step
A determination step of determining whether the command is based on the first transmission protocol or the second transmission protocol; and if the determination step determines that the RW command is based on the second transmission protocol, the RW command is converted to the first transmission protocol. A first conversion step of performing conversion based on the transmission protocol.

According to the present invention, an RW command based on a first protocol and an R command based on a second transmission protocol are provided.
Whichever of the W commands is received by the IC card reader / writer can be handled without separately preparing a logic circuit for executing command processing in the IC card reader / writer for each RW command.

[0014]

FIG. 1 shows an IC according to an embodiment of the present invention.
It is a functional block diagram of a card reader / writer. The IC card reader / writer 1 according to the present invention includes: a receiving unit 11 for receiving an RW command based on a first transmission protocol or a second transmission protocol different from the first transmission protocol from a host computer; Determining means 1 for determining whether the RW command is based on the first transmission protocol or the second transmission protocol
2, when the determination unit 12 determines that the RW command is based on the second transmission protocol, the first conversion unit 13 converts the RW command so as to be based on the first transmission protocol; The command processing unit 14 performs command processing according to the instruction indicated in the instruction byte in the information field of the RW command based on the protocol, and assembles a response corresponding to the RW command. If it is determined that the response is based on the second transmission protocol, the second conversion unit 15 converts the response assembled by the command processing unit 14 so as to be based on the second transmission protocol, and a response based on the first transmission protocol or the second transmission protocol. Transmitting means 16 for transmitting the message to the host computer
And comprising.

Each of the above means is realized in a firmware format including a CPU in the IC card reader / writer 1.
A specific data transmission method will be described later. In the embodiment of the present invention, a half-duplex asynchronous block transmission protocol (T = 1) is preferably used as the first transmission protocol. Note that another transmission protocol may be used, for example, an asynchronous half-duplex character transmission protocol (T = 0).

In this embodiment, a unique RW command conforming to the command format defined by JICSAP is used as the RW command based on the above-mentioned second transmission protocol. Here, a command format of each RW command and a response format of a response corresponding to the RW command will be described.

FIG. 2 is a diagram showing a command format of the RW command, and FIG. 3 is a diagram showing a response format of a response corresponding to the RW command. FIG.
FIG. 3A shows a command format of an RW command based on the transmission protocol T = 1, and FIG. 3A shows a response format of a response based on the transmission protocol T = 1.

Generally, RW based on transmission protocol T = 1
Commands and responses are composed of a first field, an information field, and a last field. The first field is a header specific to the transmission protocol T = 1. The information field mainly includes information on the RW command or the response. In this embodiment, RW is used as the first predetermined byte.
N in the first field of the command and response
AD (load address) is made to correspond. In an IC card system using the transmission protocol T = 1, NAD includes:
The transmission destination or reception source address of the RW command or response is indicated.

In the present embodiment, the CLA (class) in the information field of the RW command is associated with the second predetermined byte. This CLA is I
In the processing in the C card reader / writer, it has no special meaning, and can be arbitrarily defined to some extent. INS (instruction) in the information field of the RW command is a so-called instruction byte of the command, and instructs execution of various command processes. The contents of the command processing include, for example, an IC card file close command and a reset command.

As an example of the format of the command and response of the transmission protocol T = 1, for example, in the case of an IC command which is a command to an IC card, NAD =
02 and CLA = 00. In the case of a response to an IC card, NAD = 20. For example, in the case of a RW command which is a command to an IC card reader / writer, NAD = 77. In the case of a response to the IC card reader / writer, NAD = 77.

FIG. 2B shows a command format of a unique RW command, and FIG. 3B shows a response format of a response corresponding to the unique RW command. As shown in FIG. 2B, the unique RW command is J
It conforms to the command format specified by ICSAP,
In order to facilitate the construction of the interface for the IC card reader / writer in the host computer, it does not have a head field as in the case of the RW command based on the transmission protocol T = 1, so to speak, the transmission protocol T
This is a protocol format in which the RW command based on = 1 is simplified. That is, since the unique RW command is determined to be received only from the host computer by the IC card reader / writer, the transmission protocol T
It is not necessary to have a header indicating an address as in the case of = 1, and thus it is not necessary to have a head field.

Further, as described above, the unique RW command specifies the second identifier to be present in the second predetermined byte in the information field when the transmission protocol T = 1, and the unique identifier when the transmission protocol T = 1. At the position corresponding to the first predetermined byte. In the present embodiment, the second
Although "D7" is defined as an identifier of the "?", Any other identifier may be used as long as it is within a range permitted by the provisions of the International Organization for Standardization (ISO).

As described above, the unique RW command sets the CLA = D7 to be present in the information field in the case of the transmission protocol T = 1, and the position corresponding to the first byte NAD in the case of the transmission protocol T = 1. Have. The INS (instruction) in the information field of the unique RW command is an instruction byte for instructing execution of various command processes, as in the case of the transmission protocol T = 1. This conforms to the command format specified by JICSAP.

As shown in FIG. 3B, the unique RW
The response corresponding to the command is also the transmission protocol T =
It does not have a head field as in the case of the response based on 1. As described above with reference to FIGS. 2 and 3, by checking the NAD and CLA of the received RW command, it is possible to determine whether the received RW command is an RW command based on the transmission protocol T = 1 or an original RW command. We can see that we can do it.

Next, the operation related to the data transmission processing of the IC card reader / writer according to the embodiment of the present invention will be described. FIG. 4 is a flowchart showing a data transmission process of the IC card reader / writer according to the embodiment of the present invention. First, in step S101, a command is received from the host computer.

Next, in step S102, the first byte of the received command is checked. NAD = 02
In the case of, since the received command is an IC command, the process proceeds to step S201. If NAD = 77, the received command is an RW command based on the transmission protocol T = 1, and the process proceeds to step S104. NAD = D7
In the case of, since the received command is an original RW command, the process proceeds to step S103.

In step S201, the IC command is transmitted to the IC card. In step S103, in order to convert the protocol format, a header (for example, N
AD = 77) is added to the unique RW command. As a result, the unique RW command is converted into a command conforming to the transmission protocol T = 1, and can be processed in the same manner as an RW command based on the transmission protocol T = 1.

By steps S102 and S103,
Steps S104 to S106 to be described later can be executed only by a logic circuit based on the transmission protocol T = 1. That is, RW based on the transmission protocol T = 1
According to the present invention, even if an attempt is made to be able to respond to both
Since it is not necessary to separately prepare a logic circuit for executing the command processing in the C card reader / writer for each RW command, the use efficiency of the firmware in the IC card reader / writer is improved.

In step S104, the transmission protocol T
INS, which is an indication byte in the information field of the RW command based on = 1. Step S105-
In 1 to S105-n, the command processing designated by INS is executed. Here, n is an integer. Of the n types of command processing, I in the information field of the RW command
The command processing designated by NS is executed. The contents of the command processing include, for example, an IC card file close command and a reset command.

The logic circuit for executing these command processes is based only on the transmission protocol T = 1.
The command received by the IC card reader / writer is unique RW
Even if it is a command, according to the present invention, step S
At 103, the protocol format is converted and the transmission protocol T =
Since the RW command is based on No. 1, it is possible to respond.

When the command processing is completed, a response corresponding to the RW command is assembled. The assembled response has a header, which is the first field in the transmission protocol T = 1, as shown in FIG. In step S106, step S1
02, it is checked again whether the response is a response corresponding to the RW command based on the transmission protocol T = 1 or a response corresponding to the original RW command from the result of checking the first byte of the received command already executed. I do. If the assembled response corresponds to the RW command based on the transmission protocol T = 1, the process proceeds to step S108,
If it corresponds to the unique RW command, the process proceeds to step S107.

In step S107, the header which is the first field in the transmission protocol T = 1 is deleted from the assembled response. Thereby, step S
Even if the command received at 101 is a unique RW command, a response corresponding to the unique RW command has been generated. In step S108, a response corresponding to the RW command based on the transmission protocol T = 1 or a response corresponding to the unique RW command is transmitted to the host computer.

As described above, according to this embodiment,
In the communication between the IC card reader / writer and the host computer, when the IC card reader / writer receives an original RW command conforming to the command format specified by JICSAP, the transmission protocol T is used to convert the protocol format. Since the header of = 1 is added to the unique RW command, the RW command based on the transmission protocol T = 1 and the unique RW command can be processed by the same logic circuit in the IC card reader / writer.
The use efficiency of the firmware in the IC card reader / writer is improved.

In this specification, T =
1, the present invention can be applied to other transmission protocols. For example, the transmission protocol T = 0
But it can be achieved. The present invention can be realized regardless of whether the IC card is a contact type or a non-contact type.

[0035]

As described above, according to the present invention,
In communication between an IC card reader / writer and a host computer as its host device, a transmission protocol T =
If the IC card reader / writer receives either the RW command based on the command No. 1 or the unique RW command conforming to the command format specified by JICSAP, the protocol format is converted in advance as necessary. It is not necessary to separately prepare a logic circuit for executing the command processing in each of the RW commands. That is, in this embodiment, one transmission protocol (for example, T =
Since only the logic circuit corresponding to 1) is required, the use efficiency of the firmware in the IC card reader / writer is improved, and the versatility of the IC card system to be constructed is improved.

[Brief description of the drawings]

FIG. 1 is a functional block diagram of an IC card reader / writer according to an embodiment of the present invention.

FIG. 2 is a diagram showing a command format of an RW command.

FIG. 3 is a diagram showing a response format of a response corresponding to an RW command.

FIG. 4 is a flowchart showing a data transmission process of the IC card reader / writer according to the embodiment of the present invention.

FIG. 5 is a schematic diagram of an IC card system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... IC card reader / writer 2 ... IC card 3 ... Host computer 4 ... IC card insertion slot 5 ... Antenna 11 ... Receiving means 12 ... Determining means 13 ... First converting means 14 ... Command processing means 15 ... Second converting means 16 Transmission means

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hirofumi Takeuchi 711, Kurita-sha, Toda, Nagano-shi, Nagano Prefecture Inside Shinko Electric Industries Co., Ltd. Shinko Electric Industries, Ltd. F term (reference) 5B058 CA23 KA02 KA04 KA08 YA20

Claims (18)

[Claims] 1. An IC card reader / writer which is connected to a host computer, operates based on an RW command received from the host computer, and transmits / receives data to / from an IC card. A first transmission protocol having a first identifier in a first predetermined byte, or a second transmission protocol which does not have the head field and corresponds to the first predetermined byte in the case of the first transmission protocol. Receiving means for receiving an RW command based on a second transmission protocol having an identifier of: a determining means for determining an identifier present in the first predetermined byte with respect to the RW command received by the receiving means; When the determination means determines that the second identifier exists, the head field is added to the RW command. An IC card reader / writer comprising: 2. Command processing means for performing command processing according to an instruction indicated in an instruction byte in an information field of an RW command based on a first transmission protocol,
Means for assembling a response corresponding to the RW command having a first identifier in a first predetermined byte in a head field which is a header; and when the determination means determines that a second identifier exists, the command 2. The IC card reader / writer according to claim 1, further comprising: a deletion unit configured to delete the head field from the response assembled by a processing unit. 3. The IC card reader / writer according to claim 2, further comprising transmitting means for transmitting a response based on the first transmission protocol or the second transmission protocol to a host computer. 4. An IC card reader / writer which is connected to a host computer, operates based on an RW command received from the host computer, and transmits / receives data to / from an IC card, comprising: a first transmission protocol or Receiving means for receiving, from the host computer, an RW command based on a second transmission protocol different from the first transmission protocol, wherein the RW command received by the receiving means is the first transmission protocol or the second transmission A determination means for determining which of the protocols is to be used, and when the determination means determines that the RW command is based on the second transmission protocol, the RW command is converted to be based on the first transmission protocol. IC card reader / writer, comprising: Ta. 5. A command processing means for performing command processing in accordance with an instruction indicated in an instruction byte in an information field of an RW command based on a first transmission protocol, and assembling a response corresponding to the RW command; When the RW command is determined to be based on the second transmission protocol, a second conversion unit that converts the response assembled by the command processing unit so as to be based on the second transmission protocol is provided. 4. The IC card reader / writer according to 4. 6. The IC card reader / writer according to claim 5, further comprising transmitting means for transmitting a response based on the first transmission protocol or the second transmission protocol to a host computer. 7. An RW command based on a first transmission protocol has a first identifier in a first predetermined byte in a head field which is a header, and the RW command based on a second transmission protocol includes No second field at the position corresponding to the first predetermined byte in the case of the first transmission protocol.
When the determination means detects that a second identifier exists in the first predetermined byte of the received RW command,
The IC card reader / writer according to any one of claims 4 to 6, wherein the RW command is determined to be based on the second transmission protocol. 8. The first conversion means, wherein the determination means performs RW
The IC card reader / writer according to claim 7, wherein when it is determined that the command is based on the second transmission protocol, the head field is added to the RW command. 9. The response assembled by the command processing means has a first identifier in a first predetermined byte in a head field which is a header, and the second conversion means determines that the response is the first 9. The IC card reader / writer according to claim 8, wherein when it is determined that the response is based on the second transmission protocol, the first field is deleted from the response. 10. An IC which is connected to a host computer, operates based on an RW command received from the host computer, and transmits / receives data to / from an IC card.
A data transmission method for a card reader / writer, comprising: a first transmission protocol having a first identifier in a first predetermined byte in a first field which is a header, or the first transmission protocol having no first field. A receiving step of receiving an RW command based on a second transmission protocol having a second identifier at a position corresponding to the first predetermined byte in the case of a transmission protocol; hand,
A determining step of determining an identifier present in the first predetermined byte; and an adding step of adding the head field to the RW command when the determining step determines that the second identifier exists. A data transmission method for an IC card reader / writer. 11. A command processing step for performing command processing according to an instruction indicated in an instruction byte in an information field of an RW command based on a first transmission protocol, wherein the first predetermined byte in a header first field Assembling a response corresponding to the RW command, and, if the received RW command is determined to be based on a second transmission protocol, the response assembled by the command processing step. 11. The data transmission method for an IC card reader / writer according to claim 10, further comprising: a deletion step of deleting the first field from the file. 12. The data transmission method for an IC card reader / writer according to claim 11, further comprising a transmission step of transmitting a response based on the first transmission protocol or the second transmission protocol to a host computer. 13. An IC that is connected to a host computer, operates based on an RW command received from the host computer, and transmits and receives data to and from an IC card.
A data transmission method for a card reader / writer, comprising: a receiving step of receiving an RW command based on a first transmission protocol or a second transmission protocol different from the first transmission protocol from the host computer; A determining step of determining whether the received RW command is based on the first transmission protocol or the second transmission protocol; and the determining step determines that the RW command is based on the second transmission protocol. A first conversion step of converting the RW command so as to be based on the first transmission protocol.
Data transmission method of C card reader / writer. 14. A command processing step for performing command processing according to an instruction indicated in an instruction byte in an information field of an RW command based on a first transmission protocol, and assembling a response corresponding to the RW command, If it is determined that the RW command is based on the second transmission protocol, the response assembled by the command processing step is transmitted to the second transmission protocol.
14. The data transmission method for an IC card reader / writer according to claim 13, further comprising a second conversion step of performing conversion based on the transmission protocol. 15. The data transmission method for an IC card reader / writer according to claim 14, further comprising a transmission step of transmitting a response based on the first transmission protocol or the second transmission protocol to a host computer. 16. The RW command based on the first transmission protocol has a first identifier in a first predetermined byte in a head field, which is a header, and the RW command based on the second transmission protocol has the first transmission byte. No second field at the position corresponding to the first predetermined byte in the case of the first transmission protocol.
And the determining step includes the first step of receiving the RW command.
The data of the IC card reader / writer according to any one of claims 13 to 15, wherein it is determined that the RW command is based on the second transmission protocol when detecting that a second identifier exists in a predetermined byte of the IC card reader / writer. Transmission method. 17. The IC card reader according to claim 16, wherein in the first conversion step, when the determination step determines that the RW command is based on the second transmission protocol, the first field is added to the RW command. Writer data transmission method. 18. The response assembled by the command processing step has a first identifier in a first predetermined byte in a head field as a header, and the second conversion step includes the step of determining whether the response is 18. The data transmission method for an IC card reader / writer according to claim 17, wherein when it is determined that the response is based on the transmission protocol of 2, the head field is deleted from the response.