JP4861002B2 - Communication collision prevention protocol using unique identifier - Google Patents

Description

  The present invention relates to a non-contact interface device, and more particularly to a communication collision prevention method for a non-contact interface device.

  In general, the contactless card includes a contactless integrated circuit card and a radio frequency card (RFID). Such a non-contact card is exchanged if the card is brought near the card reader.

  If one or more non-contact cards approach the reader at the same time, the reader is subject to data communication crosstalk due to signals output from a number of cards. The communication collision prevention (Anti-collation) method is used to prevent such data crossing between the reader and the card.

  The communication collision prevention method for the non-contact type card is classified into a close-up type and a remote type according to the approach distance between the card and the reader. The remote type is further distinguished by the proximity type (vicinity) and the micro waveform (RF).

  The close contact type (CICC) is ISO 10536, the proximity type (PICC) is ISO / IEC 14443, and the proximity type (VICC) is ISO / IEC 15693.

  FIG. 1 is a block diagram showing communication between a general contactless card and a reader. If one or more non-contact cards 20, 30, and 40 approach at the same time within the recognition distance of the reader device 10, the reader device 10 performs data communication using signals simultaneously output from the non-contact cards 20, 30, and 40. A cross line occurs. In order to prevent this, a communication collision prevention method is used between the reader device 10 and the non-contact type cards 20, 30, 40 so that the cards 20, 30, 40 approaching the reader device 10 can be identified. .

  A communication collision prevention method for contactless cards that satisfies ISO / IEC 14443 type A, which is an international standard for contactless cards, uses a unique identifier (UID) that is individually provided for each card. FIG. 2 is a flowchart showing a communication collision prevention method for a contactless card that satisfies ISO / IEC 14443 type A. First, when the user brings the contactless card to the antenna effective area of the reader, the contactless card emits a radio signal for informing the presence of the card. When the reader requests the card for UID transmission (S200), the card sends the UID to the reader in bit unit form (S210). The reader unit individually compares the UID bits sent by the card to identify the card (S220).

  The non-contact card communication collision prevention system that satisfies ISO / IEC 14443 type B, which is an international standard for non-contact cards, generates an arbitrary value for each card, that is, a PUPI (Pseudo Unique Proximity Card Identifier) card. Identify FIG. 3 is a flowchart showing a communication collision prevention method for a contactless card satisfying ISO / IEC 14443 Type B. First, the reader requests the card to generate an arbitrary value within a certain range (S300). The card generates different PUPIs (S310). The reader unit calls one value of PUPI and identifies the card (S320).

  A communication collision prevention method for a contactless card that satisfies ISO / IEC 15693, which is an international standard for contactless cards, will be described with reference to the flowchart of FIG. First, the reader generates a slot having 16 values every time EOF (End Of Frame) which is the last of one transmission unit is generated (S400). Then, the reader unit requests the card to transmit a unique identifier (S410). The reader identifies the card by a method in which the card responds to the slot having the same value as its own unique identifier (S420).

  The problem of the present invention is that when a large number of non-contact cards approach the reader, the reader uses the unique identifier in the card, and there is no crosstalk of data communication due to collision of signals output from a large number of cards, It is to provide a method for identifying each card.

  According to the present invention, a method for identifying at least one contactless device having a unique identifier comprises: requesting transmission of the unique identifier; inputting the unique identifier in at least one positive pulse form; and Identifying one or more of the unique identifiers transmitted if the number of input positive pulses exceeds the number of positive pulses that one unique identifier may have.

  According to the present invention, there is provided a method for identifying a non-contact type device having a unique identifier approaching a reader, wherein the unique identifier calling command is input from the reader, and the reader in the form of at least one positive pulse is used. Sending a unique identifier.

  The reader for identifying at least one contactless device having a unique identifier according to the present invention receives a unique identifier call command unit requesting transmission of the unique identifier and at least one positive pulse form of the unique identifier. Therefore, if the number of positive pulses input and the reception unit that communicates signals with the unique identifier call command unit exceed the number of positive pulses that one unique identifier can have, one And an identification unit that communicates signals with the receiving unit to identify that one or more of the unique identifiers have been transmitted.

  A non-contact device according to the present invention determines a memory for storing a unique identifier, a receiving unit that communicates a signal with the memory to receive a command from a reader, and whether or not the unique identifier can be transmitted. A command interpreter that communicates signals with the receiver, and a transmitter that communicates signals with the memory to send at least one positive pulse indicative of a unique identifier to the reader.

  A program stage of a program storage device readable by a device executing a program stage to identify at least one contactless device having a unique identifier according to the present invention comprises: requesting transmission of the unique identifier; and If at least one positive pulse indicating an identifier is input, and if the number of the input positive pulses exceeds the number of positive pulses that one unique identifier can have, one or more Identifying that the unique identifier has been transmitted.

  The program stage of the program storage device readable by a device for executing a program stage to identify a contactless device having a unique identifier according to the present invention comprises the step of receiving the unique identifier call command from a reader unit, Sending at least one positive pulse indicating the unique identifier to the reader; receiving at least one unique identifier value and a communication collision prevention command from the reader; and at least transmitted from the reader If the unique identifier value matches the unique identifier of the contactless device, the method includes sending at least one positive pulse indicating the unique identifier to the reader.

  A contactless card according to the present invention includes a unique identifier having a plurality of bytes, a receiving unit for receiving a communication collision prevention command indicating at least one required identifier byte, and at least one byte of the unique identifier. A comparison unit that communicates a signal with the receiving unit to compare at least one required identifier byte with at least one byte of the unique identifier and the at least one required identifier byte A transmission unit responsive to the comparison unit to send the unique identifier in the form of a positive pulse.

  A contactless card reader according to the present invention includes a transmission unit for sending a communication collision prevention command indicating at least one required identifier byte, and at least one byte of the at least one required identifier byte and a unique identifier. And the reception unit for inputting the unique identifier in the form of a positive pulse, and if the number of the unique identifier bytes exceeds the number of the positive pulses, the reception to identify a collision. And an identification unit that communicates signals.

  According to the present invention, there is provided a communication collision prevention method for a contactless card, a step of requesting the card to transmit a unique identifier composed of a certain number of bytes, and a step of simultaneously inputting the unique identifier in the form of a positive pulse. Counting the number of input positive pulses, and determining that one or more cards have responded if the number of input positive pulses exceeds the predetermined number of bytes. Including.

  The program of the instruction word executable by the device for executing the program stage to prevent communication collision of the non-contact type device according to the present invention and the program stage of the readable program storage device are constituted by a certain number of bytes on the card Requesting transmission of the received unique identifier, the step of simultaneously inputting the unique identifier in the form of a positive pulse, the step of counting the number of the input positive pulses, and the input positive number Determining that one or more of the cards has responded if the number of pulses exceeds the predetermined number of bytes.

  According to the present invention, the reader device can identify each card using the unique identifier in the card, and even if a large number of cards approach the reader device, signals output to the large number of cards can be identified. It becomes possible to solve the crosstalk of data communication due to collision.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 5 is a block diagram illustrating data communication between a reader and a contactless card according to an exemplary embodiment of the present invention. Each of the contactless cards 510, 520, and 530 has a unique identifier that is a unique identification number of itself. In other words, the unique identifier is the only value given individually for each card, and no card having the same unique identifier can exist.

When the contactless cards 510, 520, and 530 approach the antenna effective area of the reader device 500, the reader device 500 sends a command for calling the unique identifier of each contactless card 510, 520, and 530. Then, each of the non-contact cards 510, 520, 530 that has received a command from the reader 500 sends its own unique identifier to the reader 500 in the form of a positive pulse. After the contactless cards 510, 520, and 530 divide the unique identifier having an integral multiple of one byte (Byte) into one byte (Byte) and convert it into a positive pulse form. , Send continuously. That is, the transmission unit is one byte, and each divided one byte unique identifier (unique identifier byte) of one transmission unit including locations of 0 to 255 places , which is a range of values that one byte can represent. ) Is converted into a positive pulse, and the transmission unit is continuously transmitted by the total number of bytes of the unique identifier. For example, in the case of non-contact cards 510, 520, and 530 having a unique identifier having a total length of 4 bytes, the number of positive pulses transmitted from one non-contact card 510, 520, and 530 to the reader 500 is four. Must be individual.

  A unique identifier in the form of a positive pulse transmitted from the contactless cards 510, 520, and 530 to the reader device 500 will be described in detail with reference to FIGS. 6A to 6C.

  FIGS. 6A to 6C are signal diagrams showing that the cards 510, 520, and 530 that have received the unique identifier call command from the reader 500 send the unique identifier in the form of a positive pulse. The card divides its own unique identifier into bytes and converts it into a positive pulse form, and then sends it continuously. That is, the transmission unit is set to one byte, and the portion corresponding to the value of each byte in the range of values that can be expressed by one byte is converted into a positive pulse and sent. The positive pulse form has a form in which the amplitude of the pulse is increased at a position corresponding to each byte value of the unique identifier.

  According to FIG. 6A, the unique identifier value of card 1 (510) is 150 for the first byte, 180 for the second byte, and 180 for the third byte. According to FIG. 6B, the unique identifier value of the card 2 (520) is 100 for the first byte, 80 for the second byte, and 80 for the third byte. According to FIG. 6C, the unique identifier value of card 3 (530) is 150 for the first byte, 120 for the second byte, and 120 for the third byte.

  FIG. 6D is a signal diagram showing that the reader recognizes the unique identifier value sent by the card. That is, when the three cards 510, 520, and 530 approach the reader device 500 from FIG. 6A to FIG. 6C, the values of the first unique identifier recognized by the reader device 500 are two values of 100 and 150. Even though three cards 510, 520, and 530 approach the reader device 500, the first unique identifier values of the card 1 (510) and the card 3 (530) are the same. Only two values of will be recognized.

  7A and 7B are flowcharts illustrating a communication collision prevention method according to an exemplary embodiment of the present invention. When the contactless cards 510, 520, and 530 approach the antenna effective area of the reader device 500, the reader device 500 sends a command for calling the unique identifier of each contactless card 510, 520, and 530 (S600). ). Then, each of the non-contact cards 510, 520, and 530 having received the command from the reader device 500 sends its own unique identifier to the reader device 500 in the form of a positive pulse (Positive Pulse) (S610). The reader 500 counts the number of positive pulses input from the card, and determines whether a large number of cards have approached (S620). For example, the transmission unit of the unique identifier is divided by 1 byte, so that one card sends only one positive pulse per transmission unit. Therefore, if two or more positive pulses are input in one transmission unit, the reader 500 recognizes that a large number of cards are approaching. In the case of non-contact cards 510, 520, and 530 having a unique identifier having a total length of 4 bytes, the total number of positive pulses transmitted from one non-contact card 510, 520, and 530 to the reader 500 is 4. Must be individual. Accordingly, when the total number of positive pulses transmitted to the reader 500 becomes 5 or more, the reader 500 recognizes that a large number of cards are approaching.

  When the reader 500 recognizes that a large number of cards are approaching, the reader 500 selects one first byte value of the unique identifier input from the card and calls the corresponding card (S630). ). The card that matches the first byte value of the unique identifier called from the reader 500 sends the unique identifier in the form of a positive pulse. Then, the reader 500 counts the number of positive pulses responded from the card, and determines whether a large number of cards have approached (S640). If the number of responding cards is one, the reader unit 500 identifies one card, and then the reader unit 500 determines whether or not all the input unique identifiers have been called. (S650). That is, if the number of positive pulses in the first byte of the unique identifier input to the reader 500 is two, the reader must repeatedly call two values corresponding to each positive pulse. If the reader 500 completes the calling for the number of first unique identifiers input, it means that all the cards input to the reader 500 have been identified. Accordingly, the identified card enters the operation mode and executes another command received from the reader device 500 (S700). On the other hand, if the reader 500 does not complete the calling for the number of first unique identifiers input, the reader 500 selects one first byte value of the unique identifier input from the card and applies. The process returns to the step of calling a card to be played (S630).

  When the reader 500 counts the number of the first positive pulse of the unique identifier returned from the card and recognizes whether a large number of cards have approached (S640), the reader 500 reads the card. One of the second byte values of the unique identifier input from is selected and the corresponding card is called (S660). A card that matches the second byte value of the unique identifier called from the reader 500 sends the unique identifier in the form of a positive pulse. Then, the reader 500 counts the number of positive pulses responded from the card, and determines whether a large number of cards have approached (S670). If the number of responding cards is one, the reader unit 500 identifies one card, and then the reader unit 500 determines whether or not all the input second unique identifiers have been called. (S680). That is, if the number of positive pulses is two in the second byte of the unique identifier input to the reader 500, the reader 500 must repeatedly call two values corresponding to each positive pulse. If the reader 500 completes the calling for the number of second unique identifiers input, it means that all the cards input to the reader 500 have been identified. Accordingly, the identified card enters the operation mode and executes another command received from the reader device 500 (S700). On the other hand, if the reader 500 does not complete the calling for the number of second unique identifiers input, the reader 500 selects one second byte value of the unique identifier input from the card and applies. The process returns to the step of calling a card to be played (S650).

  When the reader 500 counts the number of the second positive pulse of the unique identifier returned from the card and recognizes whether a large number of cards have approached (S660), the same process as described above. In addition, the reader 500 repeats the process of selecting the next byte value of the unique identifier input from the card and calling the corresponding card. The above process is repeated until all cards approaching the reader 500 are identified. If the total length of the unique identifier is n bytes, the reader 500 can select one n-th byte value input from the card and call up the corresponding card (S690).

  The reader device 500 can identify each approaching card while performing the above-described process.

  8A to 8J are signal diagrams illustrating a communication collision prevention method according to an exemplary embodiment of the present invention.

  First, FIG. 8A shows a signal for sending a command for calling the unique identifier of each contactless card 510, 520, 530 when the contactless card 510, 520, 530 approaches the antenna effective area of the reader 500. FIG. If one transmission unit of data is determined to be a frame, the start and end of data transmission are indicated by a start frame command (SOF: StArt Of Frame) and a completion frame command (EOF: End Of Frame). When the card approaches the reader 500, the reader 500 sends a unique identifier call command [01] to the card between the start frame command SOF and the completion frame command EOF.

  FIG. 8B is a signal diagram illustrating that a card that has received a unique identifier call command from the reader 500 sends a unique identifier. FIG. 8B is a signal diagram for sending a unique identifier when there are three cards 510, 520, and 530 approaching the reader device 500 and the total length of the unique identifier is 4 bytes. The cards 510, 520, and 530 sequentially send their own unique identifiers in byte units between the start frame command SOF and the completion frame command EOF. For example, the 4-byte unique identifier value of the card 1 (510) approaching the reader device 500 is [96h, B4h, B4h, A9h] as the hexa value, and the unique identifier value of the card 2 (520) is [64h, 50h, 50h, 10h], and the unique identifier value of the card 3 (530) is [96h, 78h, 78h, 12h]. The cards 510, 520, 530 send the unique identifier value to the reader 500 in the form of a positive pulse. Then, the reader 500 counts the number of positive pulses input from the cards 510, 520, and 530, and determines whether a large number of cards have approached. In the above case, since the number of positive pulses of the first byte is two, the reader device 500 recognizes that a large number of cards are approaching.

  Recognizing that a large number of cards are approaching, the reader 500 selects one of the first byte values [64h, 96h] of the unique identifier input from the cards 510, 520, 530 and calls the corresponding card. It becomes like this. That is, as shown in FIG. 8C, the reader device 500 sends a communication collision prevention command [02], a value [01] indicating the first unique identifier position, and one first unique identifier value [64h] to the card. If the signal is transmitted, as shown in FIG. 8D, the card 2 (520) that matches the first byte value [64h] of the unique identifier called from the reader device 500 sends the unique identifier in a positive pulse form. respond. Accordingly, the reader device identifies one card, and the reader device 500 calls the remaining first byte value [96h] again. That is, as shown in FIG. 8E, the reader 500 sends a communication collision prevention command [02], a value [01] indicating the first unique identifier position, and one first unique identifier value [96h] to the card. If the signal is transmitted, as shown in FIG. 8F, the cards (card 1 (510), card 3 (530)) matching the first byte value [96h] of the unique identifier called from the reader device 500 are unique. Responds while sending the identifier in positive pulse form. When the two cards (card 1 (510) and card 3 (530)) that match the first byte value [96h] of the unique identifier called from the reader device 500 respond, the reader device 500 again. In order to distinguish the two cards (card 1 (510), card 3 (530)), a signal as shown in FIG. 8G is sent. That is, the reader 500 receives the communication collision prevention command [02], the value [02] indicating the second unique identifier position, the first unique identifier value [96h], and one second unique identifier value [B4h]. To the card. If the signal is transmitted, as shown in FIG. 8H, the card 1 (510) that matches the first and second byte values [96h, B4h] of the unique identifier called from the reader device 500 sets the unique identifier to a positive value. Respond while sending in pulse form. Accordingly, the reader unit identifies another card, and the reader unit 500 calls the remaining second byte value [78h] again. That is, as shown in FIG. 8I, the reader 500 has a communication collision prevention command [02], a value [02] indicating the second unique identifier position, a first unique identifier value [96h], and one second The unique identifier value [78h] is sent to the card. If the signal is transmitted, as shown in FIG. 8J, the card 3 (530) that matches the first and second byte values [96h, 78h] of the unique identifier called from the reader device 500 sets the unique identifier to a positive value. Respond while sending in pulse form. While performing the above process, the reader 500 identifies an approaching card.

  The reader 500 according to the present invention includes a unique identifier call command unit, a receiving unit, an identification unit, an activation unit, a byte selection unit, and a communication collision prevention command unit. The unique identifier call command unit requests each non-contact card 510, 520, 530 to transmit a unique identifier, and the unique identifier is input through the receiving unit. The unique identifier byte input through the receiving unit may be stored in a memory in the reader device 500. The identification unit counts the number of non-contact cards that have approached by counting the number of positive pulses of the unique identifier input through the reception unit. One of the bytes of the unique identifier input through the receiving unit is selected by the byte selection unit, and the communication collision prevention command unit requests transmission of the unique identifier having the selected unique identifier byte. The communication collision prevention command unit includes a byte position counter indicating the byte position of the unique identifier and one unique identifier byte value. The byte position counter increases when one or more contactless cards having the same unique identifier as the one unique identifier byte called from the reader respond. The unique identifier byte value of the communication collision prevention instruction is also changed by changing the byte position counter. The activating unit activates the contactless card in response to the unique identifier input through the receiving unit.

  Each contactless card 510, 520, 530 according to the present invention includes a memory for storing a unique identifier, and a receiving unit for inputting a command from the reader device 500. Further, the non-contact card has a comparison unit that determines whether or not the unique identifier byte input from the reader device 500 matches its own unique identifier byte, and sends its own unique identifier byte to the reader device 500. Includes transmission section.

  The communication collision prevention method according to the present invention can be applied by being programmed in hardware, software, firmware, a specific processor, or the like. The present invention can be embodied by a combination of a hardware device and a software program. The communication collision prevention method according to the present invention may be programmed and stored in a RAM or a ROM, and the operation may be controlled through a processor.

  As described above, the optimal embodiment has been disclosed in the drawings and specification. Certain terminology has been used herein for the purpose of describing the invention only and is intended to limit the scope of the invention as defined by the meaning and the claims. It was not used. Accordingly, those having ordinary skill in the art will understand that various modifications and other equivalent embodiments are possible in the future. Therefore, the technical protection scope of the present invention must be determined by the technical idea of the claims.

It is a block diagram which shows communication between a general non-contact-type card | curd and a reader device. It is a flowchart which shows the communication collision prevention system of the non-contact-type card | curd which satisfies ISO / IEC 14443 type A. It is a flowchart which shows the communication collision prevention system of the non-contact-type card | curd which satisfies ISO / IEC 14443 type B. It is a flowchart which shows the communication collision prevention system of the non-contact-type card | curd which satisfies ISO / IEC 15693. FIG. 3 is a block diagram illustrating data communication between a reader and a contactless card according to an exemplary embodiment of the present invention. It is a signal diagram which shows that the card | curd which received the unique identifier call command from the reader | leader device sends a unique identifier with a positive pulse form. It is a signal diagram which shows that the card | curd which received the unique identifier call command from the reader | leader device sends a unique identifier with a positive pulse form. It is a signal diagram which shows that the card | curd which received the unique identifier call command from the reader | leader device sends a unique identifier with a positive pulse form. It is a signal diagram which shows that a reader | leader device recognizes the unique identifier value which the card | curd sent. 3 is a flowchart illustrating a communication collision prevention method according to an exemplary embodiment of the present invention. 3 is a flowchart illustrating a communication collision prevention method according to an exemplary embodiment of the present invention. FIG. 3 is a signal diagram illustrating a communication collision prevention method according to an exemplary embodiment of the present invention. FIG. 3 is a signal diagram illustrating a communication collision prevention method according to an exemplary embodiment of the present invention. FIG. 3 is a signal diagram illustrating a communication collision prevention method according to an exemplary embodiment of the present invention. FIG. 3 is a signal diagram illustrating a communication collision prevention method according to an exemplary embodiment of the present invention. FIG. 3 is a signal diagram illustrating a communication collision prevention method according to an exemplary embodiment of the present invention. FIG. 3 is a signal diagram illustrating a communication collision prevention method according to an exemplary embodiment of the present invention. FIG. 3 is a signal diagram illustrating a communication collision prevention method according to an exemplary embodiment of the present invention. FIG. 3 is a signal diagram illustrating a communication collision prevention method according to an exemplary embodiment of the present invention. FIG. 3 is a signal diagram illustrating a communication collision prevention method according to an exemplary embodiment of the present invention. FIG. 3 is a signal diagram illustrating a communication collision prevention method according to an exemplary embodiment of the present invention.

Explanation of symbols

500 Reader 510 Card 1
520 card 2
530 card 3

Claims (3)

a) Initializing the byte position counter to n = 1 and requesting the non-contact type device to transmit a unique identifier having a length that is an integral multiple of one byte divided into one byte and converting it into a positive pulse form. B) the step of inputting the unique identifier in the form of at least one positive pulse; c) if the number of input positive pulses exceeds the number of bytes of the one unique identifier; Identifying that one or more of the unique identifiers are transmitted; and d) if one unique identifier is transmitted, the contactless device corresponding to the one transmitted unique identifier is set to an operation mode. And e) if one or more of the unique identifiers are identified, any one of the nth unique identifier bytes from the input unique identifier byte, which is a unique identifier divided into bytes. One And f) requesting transmission of the selected unique identifier having the first to nth unique identifier bytes by a communication collision prevention command; and g) the unique identifier in at least one positive pulse form. And h) identifying that one or more unique identifiers have been transmitted if the number of input positive pulses exceeds the number of bytes of one unique identifier. I) if one unique identifier is transmitted, determining whether or not the unique identifier bytes are selected by the number of the inputted nth unique identifier, and j) the inputted nth unique identifier. If the number of unique identifier bytes is not selected by the number of unique identifiers, the step returns to step e), and k) the number of unique identifier bytes is selected by the number of the input nth unique identifiers. If there is, the step of returning to step d) and l) if one or more of the unique identifiers are identified, the n is incremented by 1 unless the number of bytes of the unique identifier exceeds n. In a method for identifying a non-contact device having a unique identifier close to a reader that performs the step e) of returning to the step,
Sending the unique identifier in the form of at least one positive pulse to the reader when the unique identifier call command is input from the reader;
When at least one unique identifier value and the communication collision prevention command are input from the reader unit, if the unique identifier value input from the reader unit matches a part of the unique identifier of the non-contact device, Sending the unique identifier in the form of at least one positive pulse to the reader. a) Initializing the byte position counter to n = 1 and requesting the non-contact type device to transmit a unique identifier having a length that is an integral multiple of one byte divided into one byte and converting it into a positive pulse form. B) the step of inputting the unique identifier in the form of at least one positive pulse; c) if the number of input positive pulses exceeds the number of bytes of the one unique identifier; Identifying that one or more of the unique identifiers are transmitted; and d) if one unique identifier is transmitted, the contactless device corresponding to the one transmitted unique identifier is set to an operation mode. And e) if one or more of the unique identifiers are identified, any one of the nth unique identifier bytes from the input unique identifier byte, which is a unique identifier divided into bytes. One And f) requesting transmission of the selected unique identifier having the first to nth unique identifier bytes by a communication collision prevention command; and g) the unique identifier in at least one positive pulse form. And h) identifying that one or more unique identifiers have been transmitted if the number of input positive pulses exceeds the number of bytes of one unique identifier. I) if one unique identifier is transmitted, determining whether or not the unique identifier bytes are selected by the number of the inputted nth unique identifier, and j) the inputted nth unique identifier. If the number of unique identifier bytes is not selected by the number of unique identifiers, the step returns to step e), and k) the number of unique identifier bytes is selected by the number of the input nth unique identifiers. If there is, the step of returning to step d) and l) if one or more of the unique identifiers are identified, the n is incremented by 1 unless the number of bytes of the unique identifier exceeds n. A contactless device used with a reader that performs the step e) of returning to step e).
A memory for storing the unique identifier;
A receiver that communicates signals with the memory to receive instructions from the reader;
A command interpreter that communicates signals with the receiver to determine whether the unique identifier can be transmitted;
A transmitter for communicating signals with the memory to send at least one positive pulse indicative of a unique identifier for the reader;
When the command interpretation unit interprets that the unique identifier call command is input from the reader, the transmission unit sends the unique identifier in the form of at least one positive pulse to the reader.
When the command interpreting unit interprets that the at least one unique identifier value and the communication collision prevention command are input from the reader, the transmission unit and the non-contact with the unique identifier value input from the reader A contactless device, wherein if the part of the unique identifier of the expression device matches, the unique identifier in the form of at least one positive pulse is sent to the reader. In the program phase of the program storage device readable by a device executing the program phase to identify a contactless device having a unique identifier,
a) Initializing the byte position counter to n = 1 and requesting the non-contact type device to transmit a unique identifier having a length that is an integral multiple of one byte divided into one byte and converting it into a positive pulse form. B) the step of inputting the unique identifier in the form of at least one positive pulse; c) if the number of input positive pulses exceeds the number of bytes of the one unique identifier; Identifying that one or more of the unique identifiers are transmitted; and d) if one unique identifier is transmitted, the contactless device corresponding to the one transmitted unique identifier is set to an operation mode. And e) if one or more of the unique identifiers are identified, any one of the nth unique identifier bytes from the input unique identifier byte, which is a unique identifier divided into bytes. One And f) requesting transmission of the selected unique identifier having the first to nth unique identifier bytes by a communication collision prevention command; and g) the unique identifier in at least one positive pulse form. And h) identifying that one or more unique identifiers have been transmitted if the number of input positive pulses exceeds the number of bytes of one unique identifier. I) if one unique identifier is transmitted, determining whether or not the unique identifier bytes are selected by the number of the inputted nth unique identifier, and j) the inputted nth unique identifier. If the number of unique identifier bytes is not selected by the number of unique identifiers, the step returns to step e), and k) the number of unique identifier bytes is selected by the number of the input nth unique identifiers. If there is, the step of returning to step d) and l) if one or more of the unique identifiers are identified, the n is incremented by 1 unless the number of bytes of the unique identifier exceeds n. The unique identifier calling command is input from a reader that performs the step of returning to step e), and sending the unique identifier in the form of at least one positive pulse to the reader.
When at least one unique identifier value and the communication collision prevention command are input from the reader unit, if the unique identifier value input from the reader unit matches a part of the unique identifier of the non-contact device, Sending the unique identifier in the form of at least one positive pulse to the reader.

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