JP5466184B2 - Communication apparatus and operation method thereof - Google Patents

Description

  The present invention relates to a communication device and an operation method thereof.

  In recent years, the number of entrance / exit systems and ticket gate systems using contactless IC cards has increased.

  These systems include a host device (for example, an entry / exit management server) that creates a polling command, a relay device (for example, an IC card RW) that converts the polling command into a polling message using a predetermined communication method, and arbitrary communication means. And a mobile terminal (for example, an IC card) having an identification information management unit for managing identification information necessary for entry / exit, and a host device sends a polling command to the relay device and relays The device uses it as a trigger to repeatedly send polling messages at arbitrary intervals to detect the mobile terminal.

Application of Wireless Card System Technical Document ARIB TR-T10 1.0 Edition 13, [online], The Japan Radio Industry Association, [June 14, 2010 search], Internet <URL: http: // www. arib. or. jp / english / html / overview / doc / 3-TR-T10v1_0. pdf>

  By the way, in the existing entrance / exit system, not only the existing communication method (hereinafter referred to as communication method M) used for the non-contact IC card, but also a new communication method (hereinafter referred to as PAN) , Communication method N) can be used, the polling message by the communication method of communication method M is not changed, and the change of the system can be minimized and the communication method N can be used. It is necessary to cope with.

  1) The polling message and the response message of the communication method M need to be transmitted and received between the relay device and the mobile terminal, and the polling message and the response message of the communication method N are the same.

  2) A polling message of the communication method M is transmitted from the communication unit using the communication method M to the communication unit using the communication method N. Such a polling message appears only as data to a communication unit using the communication method N. Therefore, the communication unit transmits a message including the polling message of the communication method M to the partner relay device or mobile terminal by the communication method N, and the response message from the response message to the polling message by the communication method M Must be taken out and transmitted to a communication unit using the communication method M.

  In order to satisfy the realization requirements of 1) and 2), as compared with a system using only the communication method M, as an additional process in a system using the communication methods M and N, “a polling message by the communication method N and a message of its response” Transmission / reception (polling by communication method N) ”and“ processing for transmitting / receiving a polling message of communication method M and a response message thereof as data of communication method N (polling by communication method M via communication method N) ”are required. Become.

  However, a new processing time is added due to the addition of a new process corresponding to the realization requirements of 1) and 2), and the polling that has been completed within the time limit in the communication method M is performed in the communication methods M and N. There is a case where a timeout occurs by using and polling cannot be completed within the time limit.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a technique capable of ending polling in a communication apparatus using two communication methods at an early stage.

In order to solve the above-described problem, a first aspect of the present invention is a communication device including a first communication unit that communicates using a first communication method and a second communication unit that communicates using a second communication method. The second communication unit transmits a response message to the polling message according to the first communication method, transmits the polling message to the first communication unit, and responds to the polling message. If the polling message by the second communication method is received from the outside, a response message to the polling message by the second communication method is sent to the outside and the first message is sent from the outside. If a message according to the second communication method including the polling message according to the communication method is received, a response message is read from the storage unit, and a message according to the second communication method including the response message is read. Form, and a relay processing unit for sending to the outside, the first communication unit is attachable to and detachable from the communication apparatus, the second communication unit, the first communication unit the communication A sensor for detecting that the first communication unit is attached to the first communication unit, and the first communication unit is attached to the communication device by the sensor. The communication means is characterized in that it is performed when it is detected that it has been detected .

The second aspect of the present invention is an operation method of a communication apparatus including a first communication unit that communicates by a first communication method and a second communication unit that communicates by a second communication method, wherein the second communication unit The communication unit includes a storage unit that stores a response message to the polling message according to the first communication method, and the operation method includes that the relay processing unit of the second communication unit transmits the polling message to the first message. The relay processing unit of the second communication unit stores a response message to the polling message in the storage unit, and the relay processing unit of the second communication unit is externally connected to the first communication unit. If a polling message by the communication method 2 is received, a response message to the polling message by the second communication method is sent to the outside, and the relay processing unit of the second communication unit receives the first communication from the outside. Includes polling messages by method Serial Upon receiving the message by the second communication method, reads the message of the response from the storage unit, to create a message by the second communication method including the message of the response, which is sent to the outside, the The first communication unit is detachable from the communication device, and the second communication unit includes a sensor that detects that the first communication unit is attached to the communication device, Transmission of a polling message by the first communication method to the first communication unit is performed when the sensor detects that the first communication unit is attached to the communication device. The operation method of the apparatus is used as a solution.

  ADVANTAGE OF THE INVENTION According to this invention, the technique which can complete | finish polling in the communication apparatus which uses two communication methods at an early stage can be provided.

It is a block diagram of the communication system which concerns on 1st Embodiment. It is a block diagram of each message | telegram used by 1st Embodiment. 3 is a configuration diagram of a relay unit 132 and a relay unit 232 according to the first embodiment. FIG. It is a flowchart which shows the flow of the process in the communication part 13 in 1st Embodiment. It is a flowchart which shows the flow of a process in the communication part 23 in 1st Embodiment. It is a sequence diagram which shows an example of operation | movement of the communication system in 1st Embodiment. It is a sequence diagram which shows an example of operation | movement of the communication system in 2nd Embodiment. It is a block diagram of the relay part 132 in 3rd Embodiment. It is a sequence diagram which shows an example of operation | movement of the communication system in 3rd Embodiment. It is a figure which shows the structure of the communication apparatus 2 in 4th Embodiment. It is a flowchart which shows the flow of a process in the communication part 23 of 4th Embodiment. It is a sequence diagram which shows an example of operation | movement of the communication system in 4th Embodiment.

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

[First Embodiment]
FIG. 1 is a configuration diagram of a communication system according to first to third embodiments.

  The communication device 1 includes an information processing unit 11 that performs information processing using information in the communication device 2, a communication unit 12 that is connected to the information processing unit 11 through a wire, and a communication method M (for example, a contactless card). The communication unit 13 includes a communication unit 13 that communicates with the communication unit 12 by a communication method N (for example, electric field communication).

  The communication unit 13 is newly provided in the communication device 1. The communication device 1 before the communication unit 13 is provided is the communication device 2, that is, the communication unit 12 is connected to the communication device 2 by the communication method M. Was communicating with.

  However, after the communication unit 13 is provided, the communication device 1 is connected to the communication device 2, that is, the communication unit 13 is connected to the communication device 2 using a new communication method, that is, a communication method N different from the communication method M. connect.

  The communication unit 13 includes a relay unit 131 that communicates with the communication unit 12 using the communication method M, and a relay unit 132 that is connected to the relay unit 131 via a wire and communicates with the communication device 2 using the communication method N.

  The communication device 2 communicates with the communication unit 22 by the information processing unit 21 having information necessary for the communication device 1, the communication unit 22 connected to the information processing unit 21 by wire, and the communication method M. Includes a communication unit 23 that communicates by the communication method N.

  The communication unit 23 is newly provided in the communication device 2. The communication device 2 before the communication unit 23 is provided is the communication device 1, that is, the communication unit 22 is connected to the communication device 1 by the communication method M. Was communicating with.

  However, after the communication unit 23 is provided, the communication device 2 communicates with the communication device 1, that is, the communication unit 23 communicates with the communication device 2 by the communication method N.

  The communication unit 23 is connected to the relay unit 231 that communicates with the communication unit 22 by the communication method M and the relay unit 231 via a wire, and communicates with the communication device 1 (that is, the relay unit 132 of the communication device 1) by the communication method N. Part 232.

  FIG. 2 is a configuration diagram of each message used in the first to fourth embodiments.

  A message D1 shown in FIG. 2A is a polling message of the communication method M, and includes a header and data of the communication method M. The data includes a polling command transmitted from the information processing unit 11.

  A message D2 shown in FIG. 2B is a polling message of the communication method N, and includes a header and data of the communication method N. The data includes information indicating that the message D2 is a polling message.

  A message D3 illustrated in FIG. 2C is a message in response to the message D1 (polling message of the communication method M), and includes a header and data of the communication method M. The data includes a response command transmitted from the information processing unit 21.

  A message D4 shown in FIG. 2D is a message in response to the message D2 (polling message of the communication method N), and includes a header and data of the communication method N. The data includes information indicating that the message D4 is a response to the polling message.

  A message D5 shown in FIG. 2E is a message of the communication method N, and includes a header and data of the communication method N. The data includes a message D1.

  A message D6 shown in FIG. 2 (f) is a message of the communication method N and includes a header and data of the communication method N. The data includes a message D3.

  FIG. 3 is a configuration diagram of the relay unit 132 and the relay unit 232 according to the first embodiment.

  The relay unit 132 includes a relay processing unit 1321 that sends out the message D2 and the message D5 to the outside, and a storage unit 1322 in which the message D1 is stored.

  The relay unit 232 includes a relay processing unit 2321 that sends the message D4 and the message D6 to the outside, and a storage unit 2322 that stores the message D3.

  FIG. 4 is a flowchart illustrating a processing flow in the communication unit 13 according to the first embodiment.

  When the relay unit 131 of the communication unit 13 receives the message D1 from the communication unit 12 (S1: YES), the relay unit 131 transfers the message D1 to the relay unit 132 (S3).

  The relay processing unit 1321 of the relay unit 132 stores the message D1 in the storage unit 1322 (S5).

  Next, the relay processing unit 1321 creates a message D2 and sends it out (S7).

  Next, the relay processing unit 1321 determines whether or not the message D4 has been received from the outside (S9). If the message D4 has not been received (S9: NO), the relay processing unit 1321 determines whether or not a timeout has occurred (a predetermined time has elapsed from the time of step S7) (S11). If it is timed out, the process returns to step S7.

  When receiving the message D4 from the outside (S9: YES), the relay processing unit 1321 reads the message D1 from the storage unit 1322, creates the message D5 including the message D1, and sends it to the outside (S13).

  Next, the relay processing unit 1321 determines whether or not the message D6 has been received from the outside (S15). If the message D6 has not been received (S15: NO), the relay processing unit 1321 determines whether or not a timeout (a predetermined time has elapsed from the time in step S13) (S17). Return to, and if timed out, finish the process.

  When receiving the message D6 from the outside (S15: YES), the relay processing unit 1321 extracts the message D3 from the message D6, transmits it to the communication unit 12 via the relay unit 131 (S19), and ends the process.

  FIG. 5 is a flowchart illustrating a processing flow in the communication unit 23 according to the first embodiment.

  When the communication device 2 is activated, the relay processing unit 2321 of the relay unit 232 of the communication unit 23 creates a message D1 and transmits the message D1 to the communication unit 22 via the relay unit 231 (S101).

  Next, the relay unit 231 determines whether or not the message D3 has been received from the communication unit 22 (S103).

  If it is determined that the message D3 has not been received (S103: NO), the relay unit 231 determines whether a timeout has occurred (a predetermined time has elapsed from the time of step S101) (S107). Returning to S103, if timed out, the process proceeds to step S107.

  In step S107, the relay processing unit 2321 determines whether or not the number of transmissions of the message D1 is greater than a predetermined number of times set in advance, and if not, returns to step S101.

  If the relay processing unit 2321 exceeds the specified number of times, the relay processing unit 2321 notifies the communication device 2 of a message indicating that there is no reply (S109), and the process ends.

  When the relay unit 231 receives the message D3 (S103: YES), the relay unit 231 transfers the message D3 to the relay unit 232 (S111).

  The relay processing unit 2321 of the relay unit 232 stores the message D3 in the storage unit 2322 (S113).

  Next, when receiving the message D2 from the outside (S115: YES), the relay processing unit 2321 creates a message D4 and sends it to the outside (S117).

  Next, when receiving the message D5 from the outside (S119: YES), the relay processing unit 2321 reads the message D3 from the storage unit 2322, creates a message D6 including the message D3, and sends the message D6 to the outside (S121). The process ends.

  FIG. 6 is a sequence diagram illustrating an example of the operation of the communication system according to the first embodiment.

  FIG. 6 shows a state in which the communication devices 1 and 2 approach each other and communication is started.

  When the communication device 2 is activated, the relay processing unit 2321 of the relay unit 232 of the communication unit 23 creates a message D1 and transmits the message D1 to the communication unit 22 via the relay unit 231 (T1, T3).

  The communication unit 22 extracts the polling command from the message D1 and transmits it to the information processing unit 21 (T5).

  The information processing unit 21 receives the polling command, creates a response command to the polling command (for example, an affirmative response command), and transmits it to the communication unit 22 (T7).

  The communication unit 22 creates a message D3 including a polling command and transmits it to the relay unit 232 via the relay unit 231 (T9, T11). The relay processing unit 2321 of the relay unit 232 stores the message D3 in the storage unit 2322.

  On the other hand, in the communication device 1, when the communication device 1 is activated, the information processing unit 11 transmits a polling command to the communication unit 12 (T21).

  The communication unit 12 creates a message D1 including a polling command and transmits it to the relay unit 132 via the relay unit 131 (T23, T25).

  The relay processing unit 1321 of the relay unit 132 stores the message D1 in the storage unit 1322.

  Also, the relay processing unit 1321 creates a message D2 and sends it to the outside by the communication method N (T27).

  When the distance between the communication devices 1 and 2 is long, the message D2 does not reach the communication device 2, and the communication unit 13 repeats timeout and transmission of the message D2. For example, the communication unit 12 similarly times out, and the message D1 is transmitted again. Similarly, when the distance between the communication devices 1 and 2 is long, the communication unit 13 repeats the timeout and transmission of the message D2.

  Here, it is assumed that the information processing unit 11 is not set to time out. Therefore, the information processing unit 11 waits for a response to the polling command.

  When the communication devices 1 and 2 approach each other and the relay unit 232 of the communication unit 23 receives the message D2, it creates a message D4 and sends it to the outside by the communication method N (T31).

  When receiving the message D4, the relay processing unit 1321 of the relay unit 132 of the communication unit 13 reads the message D1 from the storage unit 1322, creates a message D5 including the message D1, and sends it out (T33).

  When receiving the message D5, the relay processing unit 2321 of the relay unit 232 of the communication unit 23 reads the message D3 from the storage unit 2322, creates a message D6 including the message D3, and sends it out (T35).

  When receiving the message D6, the relay processing unit 1321 of the relay unit 132 of the communication unit 13 extracts the message D3 and transmits it to the communication unit 12 via the relay unit 131 (T37, T39).

  The communication unit 12 extracts the response command from the message D3 and transmits it to the information processing unit 11 (T41).

  Thus, in the first embodiment, polling between the information processing units 11 and 21 is completed, and during that period, polling between the communication units 12 and 22 and polling between the communication units 13 and 23 are also completed. .

  If the response command indicates an affirmative response, the information processing unit 11 communicates with the information processing unit 21 through the communication unit 12, the communication unit 13, the communication unit 23, and the communication unit 22 in the same sequence. If the communication is completed, a polling command is transmitted to the communication unit 12, and this is repeated until the response command indicates an affirmative response.

  Even when the response command indicates a negative response, the information processing unit 11 transmits a polling command to the communication unit 12 and repeats this until the response command indicates an affirmative response.

  Therefore, according to the first embodiment, in the communication device 2, the relay processing unit 2321 transmits a polling message D1 by the communication method M to the communication unit 22 (T1, T3), and a response message to the polling message D1. D3 is stored in the storage unit 2322 (T9, T11), and if a polling message D2 by the communication method N is received from the outside (T27), a response message D4 to the polling message by the communication method N is sent to the outside (T31). If a message D5 by the communication method N including the polling message D1 by the communication method M is received from the outside (T33), the response message D3 is read from the storage unit 2322, and a message D6 by the communication method N including the message D3 is created. Then, it is sent to the outside (T35).

  Further, according to the first embodiment, in the communication apparatus 1, when the relay processing unit 1321 receives the polling message D1 by the communication method M from the communication unit 12 (T23, T25), the polling message D1 is stored. When the polling message D2 by the communication method N is transmitted to the outside (T27) and the response message D4 to the polling message by the communication method N is received from the outside (T31), the polling message D1 from the storage unit 1322 is stored. Is created, a message D5 is generated by the communication method N including the polling message D1, is transmitted to the outside (T33), and a message D6 by the communication method N including a message D3 in response to the polling message D1 by the communication method M is externally transmitted. If it is received (T35), the response message D3 is extracted from the message D6 and sent to the communication unit 12. (T37, T39), that is, since the polling of the communication method M in the communication device 2 is performed in advance, as a result, the polling between the communication units 12 and 22 and the polling between the communication units 13 and 23 are early. Can be terminated.

[Second Embodiment]
Next, a second embodiment of the present invention will be described. In the second embodiment, the same or similar apparatus and apparatus configuration as those in the first embodiment are used, and the same or similar elements are redundantly described by using the reference numerals used in the first embodiment. For brevity, the description will focus on matters different from the first embodiment.

  In the second embodiment, a plurality of communication devices 1 can be used, and each communication device 1 stores a unique device identifier.

  The polling command included in the data of the message D1 shown in FIG. 2A includes a device identifier.

  FIG. 7 is a sequence diagram illustrating an example of the operation of the communication system according to the second embodiment.

  In the second embodiment, when the relay processing unit 2321 of the relay unit 232 of the communication unit 23 receives the message D5 (T33), it creates not only the message D6 and sends it (T35), but also the message D5 from the message D5. D1 is taken out and transmitted to the communication unit 22 via the relay unit 231 (T51, T53).

  The communication unit 22 extracts the polling command from the message D1, and transmits it to the information processing unit 21 (T55).

  The information processing unit 21 receives the polling command, creates an acknowledgment response command for the polling command, and transmits it to the communication unit 22 (T57).

  The communication unit 22 creates a message D3 including a polling command and transmits it to the relay unit 232 via the relay unit 231 (T59, T61). The relay processing unit 2321 of the relay unit 232 discards the message D3, for example.

  The information processing unit 21 extracts the device identifier from the polling command and prepares for processing according to the device identifier.

  For example, the information processing unit 21 is a company that provides a service when a user who has a portable terminal incorporating the communication device 2 passes through an entrance / exit gate incorporating the communication device 1 corresponding to the device identifier. You can be prepared to pay for the service.

  Therefore, according to the second embodiment, the polling message D1 by the communication method M included in the message D5 by the communication method N includes the device identifier unique to the communication device 1, and the relay processing unit 2321 receives the message from the message D5. Since the polling message D1 is extracted and transmitted to the communication unit 22 (T51, T53), the device identifier can be extracted and used on the communication unit 22 side.

[Third Embodiment]
Next, a third embodiment of the present invention will be described. In the third embodiment, the same or similar apparatus and apparatus configuration as those of the first embodiment are used, and the same or similar elements are redundantly described by using the reference numerals used in the first embodiment. For brevity, the description will focus on matters different from the first embodiment.

  FIG. 8 is a configuration diagram of the relay unit 132 according to the third embodiment.

  The relay unit 132 includes a relay processing unit 1321, and the storage unit 1322 is unnecessary.

  FIG. 9 is a sequence diagram illustrating an example of the operation of the communication system according to the third embodiment.

  In the third embodiment, when receiving the message D1 (T25), the relay processing unit 1321 of the relay unit 132 creates the message D2 without storing it, and sends it to the outside by the communication method N (T27). .

  When receiving the message D4 (T31), the relay processing unit 1321 waits for the message D1 to be transmitted. When the message D1 is transmitted (T23, T25), the relay processing unit 1321 creates the message D5 including the message D1. Then, it is sent to the outside (T33).

  Therefore, according to the third embodiment, in the communication device 1, the relay processing unit 1321 sends the polling message D2 by the communication method N to the outside (T27), and responds to the polling message by the communication method N from the outside. After receiving the message D4 (T31), if the polling message D1 by the communication method M is received from the communication unit 12 (T23, T25), the message D5 by the communication method N including the polling message D1 is created and transmitted to the outside. If the message D6 by the communication method N including the response message D3 to the polling message D1 by the communication method M is received from the outside (T35), the message D3 of the response is extracted from the message D6, and the communication unit 12 (T37, T39), the storage unit 1322 can be made unnecessary.

  Note that the configuration of the second embodiment may be employed in the third embodiment.

[Fourth Embodiment]
Next, a fourth embodiment of the present invention will be described. In the fourth embodiment, the same or similar apparatus and apparatus configuration as those in the first embodiment are used, and the same or similar elements are redundantly described by using the reference numerals used in the first embodiment. For brevity, the description will focus on matters different from the first embodiment.

  FIG. 10 is a diagram illustrating a configuration of the communication device 2 according to the fourth embodiment.

  The communication device 2 is configured such that a relay unit (referred to as a relay unit 22 for convenience) having the function of the communication unit 22 of the first to third embodiments and a communication unit 22A including the information processing unit 21 are detachable. And a sensor 24 and a communication unit 23 for detecting that the communication unit 22A is attached. The sensor 24 is off when the communication unit 22A is not attached, and is turned on when the communication unit 22A is attached.

  FIG. 11 is a flowchart illustrating a processing flow in the communication unit 23 according to the fourth embodiment.

  When the communication device 2 is activated, the relay processing unit 2321 of the relay unit 232 of the communication unit 23 is attached with the communication unit 22A, thereby turning on the sensor 24 and receiving a signal from the sensor 24 (S151: YES), a message D1 is created and transmitted to the communication unit 22 via the relay unit 231 (S101). The following operations are the same as those in the first embodiment.

  FIG. 12 is a sequence diagram illustrating an example of the operation of the communication system according to the fourth embodiment.

  When the communication device 2 is activated, the relay processing unit 2321 of the relay unit 232 of the communication unit 23 waits for a signal from the sensor 24 instead of creating the message D1.

  When the communication unit 22A is attached to the sensor 24 and the sensor 24 is turned on (T101), the sensor 24 transmits a signal to the relay processing unit 2321 (T103).

  When receiving a signal from the sensor 24, the relay processing unit 2321 creates a message D1 and transmits the message D1 to the relay unit 22 via the relay unit 231 (T1, T3).

  Therefore, according to the fourth embodiment, in the communication device 2, the communication unit 23 includes the sensor 24 that detects that the communication unit 22A is attached to the communication device 2, and the communication method M to the communication unit 22A. Since the transmission (T1, T3) of the polling message D1 is performed when the sensor 24 detects that the communication unit 22A is attached, the communication unit 22A can be made detachable.

  In the fourth embodiment, the configurations of the second embodiment and the third embodiment may be adopted.

  In each embodiment, the information processing unit 11 may be provided not in the communication device 1 but in another communication device.

  Further, the communication device 1 may be configured to include a relay unit having the function of the communication unit 12, a communication unit including the information processing unit 21, and a communication unit 23.

  A computer program for causing a computer to cause the apparatus to execute the operation method of the communication apparatus 1 or the communication apparatus 2 according to each embodiment is a semiconductor memory, a magnetic disk, an optical disk, a magneto-optical disk, a magnetic tape, or the like. Can be recorded on a computer-readable recording medium, and can be widely distributed by being transmitted through a communication network such as the Internet.

DESCRIPTION OF SYMBOLS 1, 2 ... Communication apparatus 11, 21 ... Information processing part 12, 13, 22, 22A, 23 ... Communication part 24 ... Sensor 131, 132, 231, 232, 22 ... Relay part 1321, 321 ... Relay processing part 1322, 2322 ... memory part

Claims (2)

A communication device comprising a first communication unit that communicates with a first communication method and a second communication unit that communicates with a second communication method,
The second communication unit is
A storage unit for storing a response message to the polling message according to the first communication method;
If the polling message is transmitted to the first communication unit, the response message to the polling message is stored in the storage unit, and the polling message by the second communication method is received from the outside, the second communication A response message to the polling message by the method is sent to the outside, and if a message by the second communication method including the polling message by the first communication method is received from the outside, the response message is read from the storage unit, A relay processing unit that creates a message by the second communication method including the response message and sends the message to the outside ,
The first communication unit is detachable from the communication device;
The second communication unit includes a sensor that detects that the first communication unit is attached to the communication device, and transmits a polling message to the first communication unit by the first communication method. The communication device according to claim 1, wherein the communication device is performed when the sensor detects that the first communication unit is attached to the communication device. An operation method of a communication apparatus including a first communication unit that communicates with a first communication method and a second communication unit that communicates with a second communication method,
The second communication unit is
A storage unit storing a response message to the polling message according to the first communication method;
The operation method is as follows:
The relay processing unit of the second communication unit transmits the polling message to the first communication unit,
The relay processing unit of the second communication unit stores a response message to the polling message in the storage unit,
If the relay processing unit of the second communication unit receives a polling message by the second communication method from the outside, it sends a response message to the polling message by the second communication method to the outside,
If the relay processing unit of the second communication unit receives a message from the second communication method including the polling message from the first communication method from the outside, it reads out a response message from the storage unit, and Creating a message by the second communication method including a message and sending it to the outside ;
The first communication unit is detachable from the communication device;
The second communication unit includes a sensor that detects that the first communication unit is attached to the communication device, and transmits a polling message to the first communication unit by the first communication method. The communication device operating method is performed when the sensor detects that the first communication unit is attached to the communication device.

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