Method for controlling IC card reader/writer to transmit same ch

Details Method for controlling IC card reader/writer to transmit same ch Method for controlling IC card reader/writer to transmit same ch

1995-04-10

1998-08-04

Meky, Moustafa M.

Excavating

39518501, 371 48, G06F 1100, G06F 1580

Patent

active

057908850

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The present invention relates to an IC card reader/writer for controlling an operation to read data from an IC card and an operation to write data in the IC card, etc., for example, meeting a standard of the ISO (International Standard Organization), etc. and a method of controlling the same.


BACKGROUND TECHNOLOGY

In a technical field of the IC card, there are standards which are described in the following literature.
Literature: ISO (International Standard Organization) and IEC (International Electrotechnical Commission) 7816-3,1989 (E).
In a prior art method of controlling an IC card reader/writer, a command transmission/receive processing is executed for an IC card meeting an asynchronous half duplex character transmission protocol (transmission rule) T=0 (hereinafter referred to as T=0 protocol) as disclosed in the aforementioned literature.
FIGS. 2(a) and 2(b) are views showing a data transmission processing for the IC card. Both FIGS. 2(a) and 2(b) show respectively the status of a serial input/output line (hereinafter referred to as an SIO line) for executing a data transmission between the IC card reader/writer and the IC card.
According to the T=0 protocol as disclosed in the aforementioned literature, one character frame comprises a start bit C1, a character data C2 of 8 bits, a parity bit C3 and two stop bits C4, namely, it comprises 12 bits in total. The IC card reader/writer transmits this character to the IC card by way of the SIO line.
In such a character transmission, if a parity error is generated in a character DATAi which is transmitted from the IC card reader/writer, a receiver outputs an error signal C5 on the SIO line during a guard time after the parity bit C3, as shown in FIG. 2(b). (The SIO line is normally pulled up to "H" level. Accordingly, the error signal C5 is issued by changing the SIO line to "L" level). A transmitter checks the SIO line upon transmission of the parity bit C3 and transmits the same character DATAi again when an error signal is detected. If the parity error is not generated, the transmitter outputs a next character DATA.sub.i+1 after a guard time, as shown in FIG. 2(a).
In FIG. 2(a), there is not specified a time until the next character is transmitted upon termination of the transmission of the stop bit C4 (after the guard time). If the start bit C1 is transmitted immediately after the guard time, the SIO line is changed to "L" level. If the start bit C1 is not transmitted immediately after the guard time, the SIO line keeps "H" level. Accordingly, the SIO line status after the guard time is shown by solid lines and dotted lines in FIG. 2(a).
However, in the prior art method of controlling the IC card reader/writer, a software has executed the counting of bits among characters and the transmission/receive of the character frame, etc. in order to implement the specification of the T=0 protocol. Accordingly, a program becomes complex, which requires a large capacity memory (e.g., ROM) for storing the program therein.
It is an object of the present invention to provide an IC card reader/writer and a method of controlling the same which solved the aforementioned problems in that the program becomes complex, and hence, a large capacity memory is required.


DISCLOSURE OF THE INVENTION

To achieve the above object, the invention provides a method of controlling an IC card reader/writer for executing a command processing for an IC card under a program control, the method comprising directly connecting a transmission line and a reception line of a serial data transmission means to each other for executing a parallel/serial mutual conversion between transmission and receive data under the program control or connecting the transmission and receive lines to each other in such a way as to return an echo back character by way of a gate means so that the transmission and receive lines serve as a serial input/output line of the IC card, wherein a data transmission processing is executed at the time of sending data upon reception of the echo back charac

REFERENCES:
patent: 4845717 (1989-07-01), Iijima
patent: 4862501 (1989-08-01), Kamitake et al.
patent: 4939353 (1990-07-01), Iijima
patent: 5101410 (1992-03-01), Niimura et al.
patent: 5161231 (1992-11-01), Iijima
patent: 5369760 (1994-11-01), Iijima
patent: 5414835 (1995-05-01), Iijima
International Standard, "Identification Cards -Integrated Circuit(s) Cards With Contacts", ISO/IEC/7816-3, Part 3: Electronic Signals and Transmission Protocols.

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