JP4548738B2 - Handy terminal system and communication method thereof - Google Patents

Description

The present invention relates to a handy terminal system for communicating with a server by connecting a handy terminal to a network and a communication method therefor .

  2. Description of the Related Art In recent years, portable handy terminals and portable terminals that can communicate with each other have become widespread along with technological advances.

  Therefore, FIG. 11 shows a conventional address setting method using a handy terminal or a portable terminal using a conventional handy terminal.

  In addition, the handy terminal shown in FIG. 11 is an example, Comprising: What is necessary is just a portable terminal, It is not limited to these.

  As shown in FIG. 11, the conventional handy terminal system includes a business server 101, a network 102, a communication adapter 103, and a handy terminal 104.

  The business server 101 includes a communication interface 111, the communication adapter 103 includes a physical layer 112, and the handy terminal 104 includes a communication protocol 113.

  In the handy terminal system shown in FIG. 11, when the handy terminal 104 is connected to the business server 101 via the Internet or intranet network 102, an IP (internet protocol) address 106 unique to the handy terminal 104 itself is set. It is a common method to provide the communication with the business server 101.

That is, in this case, a unique IP address 106 is individually assigned to the handy terminal 104, and network setting is performed for each device.
JP 2004-192108 A

  For this reason, conventionally, the following two problems have occurred.

  First, the first problem is that a huge IP address is consumed.

  In a general handy terminal system, the number of handy terminals 104 is as large as 100 to thousands.

  For this reason, if IP addresses are assigned to the handy terminals 104 one by one, an enormous IP address is consumed.

  In addition, these handy terminals 104 are not connected to the network for a long time and are temporarily connected to the network only when communicating, so the number of devices connected to the network at the same time is not so many. There is a feature.

  Therefore, from the viewpoint of efficient assignment (use) of IP addresses, there is a demand for less assignment (use) of IP addresses.

  However, if the same IP address is shared by a plurality of handy terminals, they may be connected to the network at the same time. In this case, the same IP address cannot be assigned because it causes a problem in the network.

  The second problem is that the management burden such as the management burden of the IP address and the necessity of assigning maintenance personnel for setting work has been imposed.

  This is because the handy terminal 104 is often used for standing work in the outdoors or indoors, so there are many troubles due to drop impact or water immersion.

  In the event of a failure, replacement of the failed handy terminal 104 and an alternative device, and after completion of repair, it is necessary to set up a network and a unique IP address for each device again. The burden of managing IP addresses, such as whether or not to allocate IP addresses, and placing maintenance personnel to perform configuration work.

  For this reason, there has been a demand for a system that allows operators on site to easily use the network.

  By the way, the thing regarding a handy terminal system is described in patent document 1. FIG.

  As for the handy terminal system described in Patent Document 1, as shown in FIG. 12, a network IP address 205 is set in the communication adapter 203 to perform TCP / IP (transmission control protocol / internet protocol) communication. While performing between the adapter 203 and the business server 101, the handy terminal 204 is placed as a device that is not a network device.

  In this method, the handy terminal 204 is connected to the communication adapter 203 by a unique procedure that is not TCP / IP, and is converted to a protocol by the communication adapter 203 to be connected to the network 102.

  Therefore, in this method, a unique procedure 225 between the handy terminal 204 and the communication adapter 203 is newly developed, information is stored in the communication adapter 203, and the protocol between the server side interface 211 and the terminal side interface 212 is changed. There is a further problem that it is necessary to develop a mechanism for conversion, and as a device manufacturer, it is an original development technology, so the risk is high.

  On the other hand, since the communication adapter 103 in FIG. 11 is a conversion of only the physical layer 112, the implementation is much easier than the communication adapter 203 in FIG.

  Further, in view of ensuring network reliability, the user does not communicate directly between the end-to-end business server 101 and the handy terminal 204 in FIG. 12 (between the communication interface 111 and the server-side interface 211). Communication and communication between the terminal-side interface 212 and the adapter interface 213 need to be converted by the communication adapter 203. It was.

The present invention has been made in view of the above problems, and an object of the present invention is to realize a handy terminal system and a communication method therefor , which do not require development of a protocol conversion mechanism and can be assigned with a small number of IP addresses .

The handy terminal system according to the present invention includes a plurality of handy terminals that can be carried, and a communication adapter that relays connection between the handy terminal and the network, and the handy terminal is connected to the network via the communication adapter. In this connection system, one IP address shared by the plurality of handy terminals is set in the communication adapter , and an identification number is assigned to the plurality of handy terminals. Has means for requesting the IP address to the communication adapter, the communication adapter has means for transmitting the IP address in response to an address request from the handy terminal, and the communication adapter is either One handy terminal is connected The IP address is transmitted in response to an address request from the handy terminal, and the handy terminal uses the transmitted IP address to connect to the network via the communication adapter, and When communication with the above business server is performed and the connection with the communication adapter is disconnected, the IP address is deleted, and the communication adapter is disconnected from the handy terminal while connected to the handy terminal. Thereafter, when the IP address is requested again, it is determined whether the request is from a handy terminal having the same identification number as the handy terminal of the previous address request, and the handy having the same identification number is determined. When there is a request for the IP address from the terminal, the IP address is immediately It sends, after an interval of at least a predetermined time-out timer hours when there is different from the handy terminal of the IP address request the identification number, and transmits the IP address.

The communication method according to the present invention includes a plurality of portable terminals that can be carried and a communication adapter that relays connection between the handy terminal and the network, and the handy terminal is connected to the network via the communication adapter. In the communication method of the system, one IP address shared by the plurality of handy terminals is set in the communication adapter , and an identification number is assigned to the plurality of handy terminals, The handy terminal has means for requesting the IP address to the communication adapter, and the communication adapter has means for transmitting the IP address in response to an address request from the handy terminal. Any one handy terminal is connected And transmitting the IP address in response to the address request from the handy terminal when,
The handy terminal uses the transmitted IP address to connect to the network via the communication adapter and communicate with a business server on the network; and the handy terminal to communicate with the communication adapter. When the connection is disconnected, the step of deleting the IP address and the connection with the handy terminal is disconnected during the connection with the handy terminal by the communication adapter, and then the request for the IP address is made again. If there is, it is determined whether the request is from a handy terminal having the same identification number as the handy terminal of the previous address request, and when the IP address is requested from a handy terminal having the same identification number Immediately sends the IP address and the identification number is different After an interval of at least a predetermined time-out timer hours when the down di terminal a request for the IP address, characterized in that it comprises a, and transmitting the IP address.

  According to the present invention, since the Internet protocol address setting system according to the present invention can provide end-to-end communication, a highly reliable communication system is achieved by performing direct communication between a network and a wireless communication terminal. Can be provided.

  In the embodiment according to the present invention, since it is possible to connect to a highly reliable network without individually setting an IP address to a handy terminal or a portable terminal, it is possible to connect to highly reliable Internet communication. It is said.

  Here, a schematic view of an embodiment according to the present invention is shown in FIG. FIG. 1 shows a general Internet / intranet communication environment.

  The Internet protocol address setting system shown in FIG. 1 includes a business server 101, a network 102, a communication adapter 303, and a handy terminal 304.

  The handy terminal 304 may be any portable terminal and is not particularly limited to these.

  In the schematic diagram shown in FIG. 1, when the handy terminal 304 is connected to the business server 101 provided in an office, a store, or the like, it is generally connected to the network 102 via the communication adapter 303 by infrared communication for convenience. Connecting.

  That is, the communication adapter 303 is a conversion device that converts the infrared communication 105 into Internet communication.

  In such an environment, in the embodiment according to the present invention, by setting the network IP address 305 in the communication adapter 303, the handy terminal 304 can be set without setting the IP address individually in the handy terminal 304. An IP address 305 set in the communication adapter 303 can be used, and a mechanism for connecting to the network 102 is provided.

  As a result, in a system with a large number of handy terminals 304 installed, it is not necessary to individually assign IP addresses, and it is only necessary to prepare IP addresses corresponding to the number of communication adapters 303 having a smaller number. The number can be reduced.

  In addition, the handy terminal 304 is often used for standing work in the outdoors or indoors, and therefore, there are many failures due to a drop impact or water immersion.

Therefore, it is not necessary to reset the IP address unique to each handy terminal every time the handy terminal 304 is replaced when the handy terminal 304 breaks down, and the device manager, maintenance worker, office or store operator Can be reduced.
(First embodiment)
(1) Internet Protocol Address Setting System According to First Embodiment (1-1) Configuration of Internet Protocol Address Setting System First, FIG. 2 shows an Internet protocol address setting system according to the first embodiment of the present invention. Details will be described with reference to FIG.

  The Internet protocol address setting system shown in FIG. 2 includes a business server 101, a network 102, a communication adapter 303, and a handy terminal 304, as in the schematic diagram of FIG.

  In this Internet protocol address setting system, an IP address 305 is set in the communication adapter 303, and the IP address 305 is notified to the handy terminal 304.

  Thereby, since end-to-end communication can be performed between the business server 101 and the handy terminal 304, the reliability of communication between the business server 101 and the handy terminal 304 can be ensured.

  In FIG. 2, as in FIGS. 11 and 12, the handy terminal 304 is connected to the network (Internet or intranet) 102 by relaying the communication adapter 303. The partner station for communication of the handy terminal 304 is the business server 101.

  An IP address 305 is set in advance in the communication adapter 303 and stored in a non-volatile device (nonvolatile memory) such as a flash memory.

Since the communication adapter 303 is a permanent device that is not carried, there are few failures, and once the IP address 305 is set, re-setting is not required unless there is a replacement due to failure.
(1-2) Overall Operation of Internet Protocol Address Setting System (1-2-1) Notification of IP Address from Communication Adapter 303 to Handy Terminal 304 Special IP address exchange between handy terminal 304 and communication adapter 303 Communication (hereinafter referred to as IP acquisition procedure 311) is performed before communication with the business server 101.

  Communication in this IP acquisition procedure 311 is communication in an infrared section (hereinafter referred to as infrared communication 105) closed between the communication adapter 303 and the handy terminal 304, and does not communicate with the network 102.

  Therefore, no garbage message is sent to the network 102 by the infrared communication 105.

In the IP acquisition procedure 311, the communication adapter 303 notifies the handy terminal 304 of the IP address 305 for accessing the network 102 between the handy terminal 304 and the communication adapter 303.
(1-2-2) Specific Example of IP Address 305 Notification Next, the simplest procedure for notifying the IP address 305 will be described.

  Referring to the IP acquisition procedure 311 in FIG. 2, first, the handy terminal 304 transmits a start message to the communication adapter 303 (step 401).

  Further, the handy terminal 304 not only transmits a start message (step 401) but also makes an IP address acquisition request (step 402).

  Receiving this, the communication adapter 303 transmits (releases) the IP address 305 to the handy terminal 304 (step 403).

  When the handy terminal 304 acquires the IP address 305 from the communication adapter 303, the handy terminal 304 transmits an end message to the communication adapter 303 as reception completion of the IP address 305 (step 404).

Thereby, the handy terminal 304 starts TCP / IP communication with the business server 101 by the business communication procedure 312 between the business server 101 and the handy terminal 304 using the acquired IP address 305 (step 405). Complete communication.
(1-2-3) Deletion of IP Address 305 After Completion of Communication When the handy terminal 304 completes communication according to the business communication procedure 312, the handy terminal 304 deletes the acquired IP address 305.
(1-2-4) Processing when communication is interrupted due to separation from communication adapter 303 and communication resumption method In the present embodiment, one IP address 305 set in communication adapter 303 is assigned to a plurality of handy terminals 304. Shared.

  For this reason, it is necessary to control so that communication by the plurality of handy terminals 304 is not confused with a time difference.

  Therefore, regardless of whether or not the handy terminal 304 is communicating, when the handy terminal 304 is removed from the communication adapter 303, the communication adapter 303 immediately and reliably disconnects the communication adapter 303 from the network 102. There is a need.

  When the handy terminal 304 is disconnected from the communication adapter 303, the communication adapter 303 is disconnected from the network 102 and disconnects the communication adapter 303 from the network 102.

  On the other hand, the handy terminal 304 deletes the IP address when disconnected from the communication adapter 303.

  If the same handy terminal 304 is returned to the communication adapter 303 and there is a continuation of communication due to incomplete previous communication in the handy terminal 304, the IP acquisition procedure 311 is executed again to obtain the IP address 305. And try again.

  At this time, the communication adapter 303 notifies the handy terminal 304 of the IP address 305 after a sufficient time has passed since the last interruption or the terminated communication.

  This is for the purpose of preventing the communication from continuing as a continuation of the communication by the business communication procedure 312 interrupted by the business server 101 after the communication is resumed.

  In addition, since another handy terminal 304 (not shown) may start a new communication, it is necessary to allow sufficient time for the business server 101 to end the communication.

  In addition, since the handy terminal 304 is connected to the communication adapter 303 by infrared communication 105, an operator (operator) can easily remove it from the communication adapter 303 and take it out to the business if necessary for the business.

  For this reason, when the communication adapter 303 is removed during communication, the communication at that time is interrupted, and when it is returned to the communication adapter 303 again, the IP address 305 is received again by the IP acquisition procedure 311 and interrupted. Restart communication, including the communication that was in progress.

Thus, a plurality of handy terminals 304 can share one IP address 305 using one communication adapter 303.
(1-2-5) Separation of Handy Terminal 304 and Communication Adapter 303 and Detection of Connection An example of connection confirmation between the handy terminal 304 and the communication adapter 303 is shown in FIG.

  In the connection confirmation example shown in FIG. 3, the voltage detector 812 satisfies the condition satisfying both that the handy terminal 304 is set in the communication adapter 303 and the power of the handy terminal 304 is turned on. To check that it is connected.

  The communication adapter 303 determines that the handy terminal 304 is connected when the voltage is detected by the voltage detector 812.

The detection of the voltage is performed through the contact electrode 813 while monitoring the ON / OFF of the power switch 811.
(1-3) Effect of Internet Protocol Address Setting System According to the present embodiment, since end-to-end communication is provided, direct communication is performed between the business server 101 and the handy terminal 304, and the reliability is high. A communication system is provided.

  Also, since an IP address is assigned to the communication adapter 303, it is only necessary to assign an IP address of 1/10 to 1/100, rather than assigning to a plurality of handy terminals 304 one by one, so that the IP address can be used efficiently. It becomes.

  In addition, since the IP address 305 is set to the communication adapter 303 that has far fewer failures than the handy terminal 304, the frequency of occurrence of failures is low, and the effort for resetting hardly occurs.

  Furthermore, all the network settings of the handy terminal 304 can be set in advance with the same settings, and only the IP address 305 may be obtained from the communication adapter 303.

Thereby, in this Embodiment, the necessity of arrangement | positioning and ensuring of the maintenance personnel for the setting of the network 102 of the handy terminal 304 can be made unnecessary.
(Second Embodiment)
(2) Internet Protocol Address Setting System According to Second Embodiment (2-1) Configuration of Internet Protocol Address Setting System Next, an Internet protocol address setting system according to the second embodiment is shown in FIG.

  In FIG. 4, depending on the customer network 102, an individual IP address may not be set, and an IP address may be automatically assigned by DHCP (dynamic host configuration protocol).

  FIG. 4 shows the operation of the communication adapter 303 and the handy terminal 304 in that case.

  In the case of FIG. 4, it is not necessary to set an individual IP for the handy terminal 304, and thus the communication adapter 303 does not need to give an IP address.

  The communication adapter 303 is set to “DHCP setting”, and the network terminal 102 is made through so that the handy terminal 304 does not restrict the operation of requesting / obtaining the IP address to the DHCP server.

  As a result, the DHCP protocol 114 of the handy terminal 304 communicates with the DHCP protocol 511 of the DHCP server 501.

This state is direct communication between the handy terminal 304 and the DHCP server 501 as shown in the DHCP protocol 511.
(Third embodiment)
(3) Internet Protocol Address Setting System According to Third Embodiment (3-1) IP Address Assignment by Handy Terminal Manufacturing Number Management Next, an example of IP address assignment by manufacturing number management according to the third embodiment This will be described with reference to FIG.

In the communication system of the communication adapter 303 and the handy terminal 304 as shown in FIG. 3 in the third embodiment, after the operator temporarily removes the handy terminal 304 from the communication adapter 303 and returns it, This is a means for shortening the time required for resuming communication.
(3-2) Operation of IP Address Assignment by Manufacturing Number Management In the first embodiment, in the case of (1-2-4), the process at the time of communication interruption due to the separation from the communication adapter 303 in FIG. As described above, when the handy terminal 304 is removed from the communication adapter 303, there is a possibility that another handy terminal or portable terminal may be mounted.

  Therefore, it has been necessary to avoid misunderstanding that the communication partner station (the business server 101 or the like) is continuing the communication.

  For this reason, when the handy terminal 304 is disconnected from the communication adapter 303, the communication adapter 303 is always disconnected from the network 102 first.

  In the next communication, it is necessary to always start the communication by passing the IP address to the handy terminal 304 after the timeout timer has elapsed.

  Thereby, when the handy terminal 304 comes off for a moment due to vibration, or after the operator removes the handy terminal 304 from the communication adapter 303 and returns immediately, the communication cannot be resumed until the time-out timer has elapsed. It took time to connect again (see FIG. 5).

  In FIG. 5, when the handy terminal 304-0010 and the handy terminal 304-0012 are disconnected from the communication adapter 303 in the two handy terminals 304 when there is no serial number management, the time-out timer times of the interval 681 and the interval 682 are exceeded. Indicates that the interval must be spaced.

  In order to solve this problem, the communication adapter 303 shown in FIG. 6 manages to which handy terminal 304 the IP address is released (IP address transmission) using a table as shown in FIG.

  When an IP address request is received from the same device that released the IP address immediately before, it is determined that communication is continued, and the same IP address is immediately released.

  Thereby, for example, the handy terminals 304-0010 shown in FIG. 6 can confirm that the serial numbers are the same device and immediately release the same IP address. Can be resumed.

  In FIG. 6, the handy terminal 304-0012 waits for communication instead of the handy terminal 304-0010, and after the handy terminal 304-0010, the handy terminal 304-0012 starts communication.

  In this case, the handy terminals 304-0012 start communication after the timeout timer 682 has elapsed.

In the communication adapter 303, the management table as shown in FIG. 8 is used to manage when the most recent communication of the IP address xxxx is terminated by the communication disconnection time (10:20:40 in FIG. 8), and the timeout timer elapses. Later, the next communication is started.
(3-3) Elimination of waiting time for IP address release by setting multiple IP addresses In the present embodiment described above, when the same handy terminal 304-0010 is once removed from the communication adapter 303 and immediately returned, Communication could be resumed without waiting for a predetermined timeout timer XX (ie, interval 691).

  However, the new handy terminals 304-0012 had to wait for a predetermined timeout timer XX time (ie, interval 682).

  FIG. 9 shows an improvement in efficiency by registering a plurality of IP addresses in the communication adapter 703 and assigning different IP addresses to different handy terminals so that communication can be performed at time intervals equal to or less than the timeout timer XXsec. .

  In the communication adapter 703 of FIG. 9, the release destination terminal and the latest disconnect time are managed for each IP address as shown in FIG.

  In FIG. 9, on the communication adapter 703, immediately after IP-1 was released to the handy terminal 304-0010 (manufacturing No. 304-0010), it was replaced with the handy terminal 304-0011 (manufacturing No. 304-0011). In this case, the waiting time XX can be shortened by releasing another IP address IP-2 without waiting for the timeout timer XXsec at the handy terminal 304-0011 (manufacturing No. 304-0011), and the connection start time can be reduced. Efficiency can be improved.

  Alternatively, in the case where the handy terminal 304-0011 (manufacturing No. 304-0011) is replaced, the timeout timer XXsec is determined from the latest disconnection time of IP-1 or IP-2 shown in FIG. If it has already passed, the past IP address can be used.

  If any IP address (IP-1, IP-2) has not yet passed the timeout timer XXsec, a new IP address IP-3 is released, and the handy terminal 304 is released. Communication can be started without waiting for -0012 (production No. 304-0012).

  As described above, the communication adapter 703 includes a plurality of IP addresses, and by appropriately using the communication adapter 703, communication can be efficiently started without waiting for the plurality of handy terminals 304 for the timeout timer time.

It is the schematic of the internet protocol address setting system by the 1st Embodiment in this invention. It is a block diagram of the internet protocol address setting system by the 1st Embodiment in this invention. The connection confirmation example of the handy terminal and the communication adapter according to the first embodiment of the present invention is shown. FIG. 2 is a configuration diagram of an Internet protocol address setting system using DHCP according to a second embodiment of the present invention. It shows about the timeout timer time of the handy terminal when there is no serial number management according to the first embodiment of the present invention. It shows about the timeout timer time of the handy terminal when there is serial number management according to the third embodiment of the present invention. It is the specific example which showed the management table | surface which manages an IP address when there exists serial number management by 3rd Embodiment in this invention. It is the specific example which showed the management table | surface which manages an IP address by communication disconnection time when there exists manufacturing number management by 3rd Embodiment in this invention. It is the example which allocates a different IP address to a different handy terminal by 3rd Embodiment in this invention. It is the specific example which showed the management table | surface which manages each IP address when there exist several IP address by the communication cutting time by 3rd Embodiment in this invention. It is the block diagram which showed the conventional handy terminal system. It is the block diagram which showed the thing regarding the conventional handy terminal system.

Explanation of symbols

101 Business server 102 Network 103, 203 Communication adapter 104, 204 Handy terminal 105 Infrared communication 303, 703 Communication adapter 304 Handy terminal 304-0010, 304-0011, 304-0012 Handy terminal 305 Set IP address 306 Obtained IP address 311 IP acquisition procedure 312 Business communication procedure between business server 101 and handy terminal 304 313 DHCP IP acquisition procedure 501 DHCP server 811 Power switch 812 Voltage detector 813 Contact electrode

Claims (8)

A system that has a plurality of portable terminals that can be carried and a communication adapter that relays a connection between the handy terminal and a network, and that connects the handy terminal to the network via the communication adapter;
One IP address shared by the plurality of handy terminals is set in the communication adapter , and an identification number is assigned to the plurality of handy terminals,
The handy terminal has means for requesting the IP address to the communication adapter, and the communication adapter has means for transmitting the IP address in response to an address request from the handy terminal;
The communication adapter transmits the IP address in response to an address request from the handy terminal when any one handy terminal is connected,
The handy terminal uses the transmitted IP address to connect to the network via the communication adapter, communicate with a business server on the network, and disconnects from the communication adapter. Deletes the IP address ,
When the communication adapter is disconnected from the handy terminal while connected to the handy terminal, and then the IP address is requested again, the same identification number as the handy terminal of the previous address request is issued. Determine whether it is a request from a handy terminal
When there is a request for the IP address from a handy terminal having the same identification number, the IP address is immediately transmitted, and when there is a request for the IP address from a handy terminal with a different identification number, a predetermined time-out occurs. A handy terminal system , wherein the IP address is transmitted after an interval equal to or longer than a timer time .   The handy terminal system according to claim 1, wherein the communication adapter performs infrared communication with the handy terminal when any one handy terminal is connected. The communication adapter is set by a plurality of different IP addresses that are shared by the plurality of handy terminals and are smaller than the number of the plurality of handy terminals,
The communication adapter, the handy terminal is connected, when another handy terminal immediately after sending the IP address to the handy terminal is connected, without waiting for the predetermined time-out timer time, said another handy terminal handy terminal system according to claim 1 or 2, characterized in that to send a different IP address from the IP address the transmission against. The communication adapter is set by a plurality of different IP addresses that are shared by the plurality of handy terminals and are smaller than the number of the plurality of handy terminals,
The communication adapter has means for managing the time after disconnection for each handy terminal having a different identification number;
The communication adapter, the connection between the handy terminal is disconnected, then, if another handy terminal is connected, the time after cutting of the cutting front of the handy terminal has elapsed the predetermined time-out timer time Whether or not
If the time after the disconnection has passed the predetermined timeout timer time, send the same IP address as before the disconnection to the other handy terminal,
When the time after the disconnection does not exceed the predetermined timeout timer time, an IP address different from the IP address before the disconnection is transmitted from the plurality of IP addresses to the other handy terminal. The handy terminal system according to claim 1 or 2 , characterized by the above. A communication method of a system comprising a plurality of handy terminals that can be carried and a communication adapter that relays connection between the handy terminal and a network, wherein the handy terminal is connected to the network via the communication adapter. ,
One IP address shared by the plurality of handy terminals is set in the communication adapter , and an identification number is assigned to the plurality of handy terminals,
The handy terminal has means for requesting the IP address to the communication adapter, and the communication adapter has means for transmitting the IP address in response to an address request from the handy terminal;
A step of transmitting the IP address in response to an address request from the handy terminal when any one handy terminal is connected by the communication adapter;
The handy terminal uses the transmitted IP address to connect to the network via the communication adapter and communicate with a business server on the network;
When the connection with the communication adapter is disconnected by the handy terminal, erasing the IP address;
When the connection with the handy terminal is disconnected during the connection with the handy terminal by the communication adapter and then the IP address is requested again, the same identification number as the handy terminal of the previous address request is set. It is determined whether the request is from a handy terminal having the same identification number, and when there is a request for the IP address from a handy terminal having the same identification number, the IP address is immediately transmitted, and from the handy terminal having a different identification number A step of transmitting the IP address after an interval of a predetermined timeout timer time or more when there is a request for the IP address;
A communication method comprising: 6. The communication method according to claim 5 , wherein the communication adapter performs infrared communication with the handy terminal when any one of the handy terminals is connected. The communication adapter is set by a plurality of different IP addresses that are shared by the plurality of handy terminals and are smaller than the number of the plurality of handy terminals,
The communication adapter, the handy terminal is connected, when another handy terminal immediately after sending the IP address to the handy terminal is connected, without waiting for the predetermined time-out timer time, said another handy terminal The communication method according to claim 5 or 6 , wherein an IP address different from the transmitted IP address is transmitted. The communication adapter is set by a plurality of different IP addresses that are shared by the plurality of handy terminals and are smaller than the number of the plurality of handy terminals,
The communication adapter has means for managing the time after disconnection for each handy terminal having a different identification number;
The communication adapter, the connection between the handy terminal is disconnected, then, if another handy terminal is connected, the time after cutting of the cutting front of the handy terminal has elapsed the predetermined time-out timer time Whether or not
If the time after the disconnection has passed the predetermined timeout timer time, send the same IP address as before the disconnection to the other handy terminal,
When the time after the disconnection does not exceed the predetermined timeout timer time, an IP address different from the IP address before the disconnection is transmitted from the plurality of IP addresses to the other handy terminal. The communication method according to claim 5 or 6 , characterized by the above.

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