JPH09149073A - Data communication method and data communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To set an IP(interface protocol) address easily and quickly from a specific data communication equipment to each of IP address setting requirement data communication equipments (including after exchange). SOLUTION: When an IP address request frame with a station number allocated to an IP address unsetting data communication equipment 3-1 is received by a specific data communication equipment 6-1 from the electrode 3-1 including a data communication equipment after exchange, the equipment 6-1 sends the IP address retrieved from a station IP table with the station number to the equipment 3-1 as an IP address setting frame. Then they are set to an IP address storage medium 8 quickly.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a TCP (Transmission Control Protocol) between a plurality of data communication devices via a transmission line.
The present invention relates to a data communication system in which data communication is carried out by a rotocol) / IP (Internet Protocol) protocol, and in particular, each data communication device that needs an IP address transfer setting from another data communication device has its own device. Even if the data communication device is replaced with a normal one due to a hardware failure, etc., data communication is performed for each data communication device after the replacement with the IP address easily and promptly transferred from the other data communication device. And a data communication method in which such a data communication method is practicable.

[0002]

2. Description of the Related Art Generally, in a data communication system employing the TCP / IP protocol, when data communication is performed between data communication devices via a transmission line,
In each of these data communication devices, the physical address and the IP address of the communication partner data communication device as well as the own device must be confirmed in advance. An IP address is essential for data communication using the TCP / IP protocol. A problem with such a data communication system is that not all data communication devices have the same configuration, and some data communication devices do not have an auxiliary storage function such as a magnetic disk. In a data communication device that does not have an auxiliary storage function such as a magnetic disk (hereinafter simply referred to as a diskless data communication device), the physical address of its own device is set by hardware. Although it can be easily confirmed, the IP address of the own device needs to be transferred and set from another data communication device (non-diskless data communication device). Until now, Internet communication protocol RARP (RFC903)
Depending on the system, I for each diskless data communication device
The P address transfer setting was performed, and the IP address transfer setting method by this is as follows.

That is, in any non-diskless data communication device accommodated in a transmission line, a physical address for each of all data communication devices (including non-diskless data communication device) accommodated in the transmission line and The IP address is managed as table data. Now, it is necessary to transfer and set the IP address from the non-diskless data communication device having the address table to each of the diskless data communication devices. Since it is unclear whether or not the table is provided, each diskless data communication device transmits an IP address request frame to which a physical address of its own device is added in a broadcast format on the transmission path. . As a result, the IP address request frame can be received by the non-diskless data communication device equipped with the address table. When the IP address request frame is received, the non-diskless data communication device searches the address table using the physical address added to the IP address request frame as a key and stores it as a pair with the physical address. Has been I
The P address can be retrieved. The retrieved IP address is sent to the requesting diskless data communication device I
By being transmitted as the P address setting frame, the IP address can be set in the request source diskless data communication device.

[0004] As regards this kind of technology,
So far, for example, Japanese Patent Laid-Open No. 7-66809 can be mentioned. In this case, if the host name is unknown,
Since the management station arbitrarily sets an IP address for the diskless station, the host station cannot recognize which diskless station to transfer which control program or data. .

[0005]

By the way, as a problem in the IP address setting by the RARP method according to the prior art, the device itself is replaced with a normal one due to some failure in the diskless data communication device. There are cases where it is done. The physical address is fixed in hardware and fixedly as a unique one for each data communication device. Therefore, it is not allowed to freely change the physical address itself, but with the replacement of the diskless data communication device itself. The inconsistency of physical addresses before and after replacement is unavoidable. Even in such a case, in order to allow the IP address to be set in the replaced diskless data communication device, the diskless data communication device related to the replacement is displayed on the address table provided in the non-diskless data communication device. It is necessary to update the correspondence relationship between the physical address and the IP address in accordance with the state after the exchange, but the table contents need to be updated exclusively manually. For this reason, much time is required for the update, and the diskless data communication device relating to the exchange cannot perform data communication until the update is completed.

On the other hand, apart from the above, it is also conceivable to set the IP address for each diskless data communication device by hardware and semi-fixedly. If the diskless data communication device itself is replaced, the IP address before the replacement may be set as it is in the replaced diskless data communication device by hardware. However, when the IP address is set in the non-volatile memory by hardware, a mechanism for updating the contents of the non-volatile memory and an update operation are required, especially when the diskless data communication device itself is replaced. , The update work has to be done in the field. Further, when the IP address is set by the semi-fixed switch, a switch mechanism for 32 bits is required to set the IP address (32-bit data) itself, which is economical and compact in size. Therefore, it is not preferable.

A first object of the present invention is to wait for an IP address setting request from each data communication apparatus (including the one after replacement) whose IP address needs to be transferred and set, and then from a specific data communication apparatus. A data communication method in which an IP address can be easily and promptly set and transferred to each of the request source data communication devices, and further data communication can be performed, and a data communication in which such a data communication method is practicable It is to provide the system. A second object of the present invention is to
Since it is not necessary to request an IP address setting from each data communication device other than the specific data communication device, the IP address can be easily and quickly transferred from the specific data communication device to each of the data communication devices, and the data communication can be performed. And a data communication system in which such a data communication method is practicable. A third object of the present invention is that even if a failure occurs in a specific data communication device, the IP address can be set in each data communication device without being affected by the failure. The present invention provides a data communication method in which data communication can be performed, and further a data communication system in which such a data communication method is practicable. A fourth object of the present invention is, in addition to the above-mentioned first object, when an IP address is set by a specific data communication device for each data communication device for which an IP address needs to be transferred and set,
It is to provide a data communication method in which the setting of an IP address can be confirmed by the specific data communication device, and further, a data communication system in which such a data communication method is practicable.

[0008]

A first object of the present invention is to assign a station number as a device identification number to each of a plurality of data communication devices in a fixed manner in advance, and to assign at least one specific data communication device to all of them. Data communication devices from each of the data communication devices having no IP address, including the data communication device after the exchange, in the state where the correspondence between the station number and the IP address of each of the data communication devices is stored in advance. When the IP address request frame added with the station number assigned to the specific data communication device is received by the specific data communication device, the IP address setting frame added with the IP address is sent from the specific data communication device. Achieved by being sent to the communication device, and enabling such IP address setting. It is achieved by the system configuration.

The second object is to assign a station number as a device identification number to each of a plurality of data communication devices in a fixed manner in advance, and to at least one specific data communication device for all data communication devices. In the state where the correspondence between the station number and the IP address is stored in advance, the specific data communication is performed under the autonomous control by the specific data communication apparatus or the control by the specific data communication apparatus based on an operation instruction from the outside. Each data communication device other than the device, including the replaced data communication device, has an I
This is achieved by transmitting an IP address setting frame to which a P address is added.
This is achieved by configuring the system so that address setting is possible.

The third object is to set a station number as a device identification number to each of a plurality of data communication devices in a fixed manner in advance, and to at least one specific data communication device for all data communication devices. Under the condition that the correspondence between the station number and the IP address is stored in the address table in advance, under the autonomous control by the specific data communication device or the control by the specific data communication device based on an operation instruction from the outside, For each data communication device including the replaced data communication device other than the specific data communication device, the correspondence between the station number and the IP address stored in the address table for each data communication device The relationship is achieved by setting the transmission to all at once, and also such station number and IP address. It is achieved by correspondence system to makes it possible to set the configuration of the.

The fourth object is that in the IP address request source data communication device, after the IP address added to the IP address setting frame from the specific data communication device is set as the IP address of the own device, This is achieved by immediately or after waiting for an IP address setting frame receipt confirmation request from the specific data communication device, a response frame indicating that the IP address is set is transmitted to the specific data communication device, and This is achieved by configuring the system so that the IP address setting can be confirmed.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS. First, a data communication system according to the present invention will be described. FIG. 1 shows a system configuration in one embodiment thereof. In this case, in the data communication system, a plurality of non-diskless data communication devices 6 (6-1, 6-2) and diskless data communication devices 3 (3-1, 3-2) are mixedly accommodated on the transmission line 4. It has been configured as a closed state. Thereby, for example, the diskless data communication device 3
Assuming that different plants are controlled by the respective plants, a control program and control data are required for each of the diskless data communication devices 3 corresponding to the plant.
It was necessary to be transferred and stored from the non-diskless data communication device 6. However, as mentioned above,
When the diskless data communication device 3 itself is replaced with a normal one due to some hardware failure, the IP address cannot be easily and quickly set in the diskless data communication device after the replacement. However, in the case of the present invention, a station number as a device identification number, which is fixedly assigned and set in advance to each of the data communication devices 3 and 6, is newly introduced, and for example, a non-diskless data communication device ( Specific data communication device) 6-1
By storing the correspondence between the station numbers and IP addresses of all the data communication devices 3 and 6 as an address table in advance, the IP address can be easily and quickly set in the replaced diskless data communication device. The system is configured so that it can be set to.

First, the internal structure of the diskless data communication devices 3-1 and 3-2 having the same structure will be described with reference to that of the diskless data communication device 3-1. Host computer 2
And a data communication device 1-1. Further, the data communication device 1-1 includes a station number setting switch 7, an IP address storage medium 8, a transmission data assembly control unit 10-1, a reception data interpretation control unit 11-1, and a TCP / IP protocol control unit 12-1. And the host computer interface section 13-1. However, some or all of the functions of the data communication device 1-1 can be replaced by the diskless host computer 2. Among the constituent elements of the data communication device 1-1, the TCP / IP protocol control unit 12-1 is connected to another diskless data communication device 3 accommodated on the transmission path 4 and a non-diskless data communication device 6. Functions to control data communication between
Including the transport layer, network layer, data link layer and physical layer in the reference model (Open Systems Interconnection), the communication protocol TC of the Internet
P (RFC792), UDP (RFC768) and I
P (RFC791). The data transmission / reception methods of the physical layer and the data link layer are standard IEEE802.3 and IEEE80 which support the TCP / IP protocol.
2.4 or FDDI (Fibre Distributed Data I)
nterface) or the like, or a transmission / reception control method equivalent to these, even if it is a non-standard method, TCP /
Anything that can support the IP protocol is sufficient.

On the other hand, the internal structure of the non-diskless data communication devices 6-1 and 6-2 having the same structure will be described with reference to that of the non-diskless data communication device 6-1. It is composed of a computer 5 and data communication devices 1-2. Similar to the data communication device 1-1, some or all of the functions of the data communication device 1-2 can be replaced by the host computer 5, but unlike the diskless host computer 2, the host computer 5 has a disk. Alternatively, a non-volatile memory or the like has a function of saving data even when the power is turned off. The data communication device 1-2 also includes a station IP table (corresponding to the address table described above) 9, a transmission data assembly control unit 10-2, a reception data interpretation control unit 11-2, and a TCP / IP protocol control unit 12-2. And the host computer interface unit 13-2, and the point that the station IP table 9 is provided instead of the station number setting switch 7 and the IP address storage medium 8 is the data communication apparatus 1-1. Is different. Similarly to the diskless data communication device 3-1, the non-diskless data communication device 6-1 is also capable of data communication with another diskless data communication device 3 and the non-diskless data communication device 6. However, as will be described later, when the data communication device 1-2 is provided with the station number setting switch 7 and the IP address storage medium 8 or the data communication device 1-1 is also provided with the station IP table 9, The system can be configured to be more versatile.

The schematic configurations of the diskless data communication device 3 and the non-diskless data communication device 6 have been described above. Here, in detail, the data communication device 1-1,
The operation of each of 1-2 will be described in connection with the station number setting switch (a mechanical switch, a semiconductor element such as a non-volatile memory or a memory with a backup power source, or a magnetic storage device) directly related to the present invention. The station number for specifically identifying the diskless data communication device 3 is semi-fixed. The station number can be set, for example, by a 3-bit numerical value when the diskless data communication device 3 and the non-diskless data communication device 6 are accommodated for a total of 8 devices on the transmission path 4. Similarly, the station number of the non-diskless data communication device 6 is set on the host computer 5 side. Further, the IP address from the non-diskless data communication device (specific data communication device) 6-1 is transferred and stored in the IP address storage medium (memory, non-volatile memory, magnetic storage device, etc.) 8. ing.

Now, assuming that the transmission data assembly control unit 10-1 is instructed to transmit the IP address request frame from the diskless host computer 2 via the host computer interface unit 13-1, the transmission data assembly control unit is assumed. In 10-1, the TCP / IP protocol control unit 12-1 is instructed to take in the station number from the station number setting switch 7 and transmit the IP address request frame to which the station number is added. .
As a result, the TCP / IP protocol control unit 12-1 transmits the IP address request frame on the transmission line 4 in a broadcast format. In the non-diskless data communication device (specific data communication device) 6-1, the IP address request frame can be received by the reception data interpretation control unit 11-2 via the TCP / IP protocol control unit 12-2. When it is identified as the IP address request frame, the received data interpretation control unit 11-2
From the station IP table 9 (a concrete example of the table contents is shown in FIG. 4) 9, I
The P address is searched and the transmission data assembly control unit 10-2 is instructed to transmit the IP address setting frame. Eventually, the retrieved IP address is transmitted together with the receiving station number to the IP address setting frame from the TCP / IP protocol control unit 12-2 on the transmission path 4, while the IP address setting frame is transmitted to the TCP / IP. IP protocol control unit 12-1
It is received by the reception data interpretation control unit 11-1 via. If the frame is identified as an IP address setting frame, the received data interpretation control unit 11-1 extracts the IP address from the frame as its own device, and stores and sets it in the IP address storage medium 8. There is something.

The setting of the IP address for each diskless data communication device 3 is normally performed as described above, but for each data communication device (excluding the non-diskless data communication device 6-1) 3 and 6 after replacement. The IP address is set in the same manner. In each of the exchanged communication devices 3 and 6, the station number before the exchange is set in the station number setting switch 7 as it is, and the IP address request frame from each of the data communication devices 3 and 6 is transmitted in the transmission line 4 in a broadcast format. It just has to be sent up. However, instead of transmitting the IP address setting frame from the non-diskless data communication device 6-1 after waiting for the IP address request frame, it is determined that the IP address setting request is not necessary, and the IP address is set to each data communication device including the replaced data communication device. It is possible to set the address easily and quickly. That is,
In the non-diskless data communication device 6-1, the autonomous control by the host computer 5,
Alternatively, under the control of the host computer 5 based on an operation instruction from the outside, when the transmission data assembly control unit 10-2 is instructed to sequentially transmit the IP address setting frames, the non-diskless data communication device 6 For all the data communication devices including the exchanged data communication device other than -1, the IP address is sequentially retrieved from the station IP table 9 using the station number assigned to the data communication device as a key. The IP address setting frame to which the IP address is added may be transmitted. Further, the IP address is not sequentially set and transferred from the non-diskless data communication device 6-1 to all the data communication devices including the replaced data communication device, but autonomous control by the non-diskless data communication device 6-1 is performed. Alternatively, based on an operation instruction from the outside or a request from a data communication device other than the non-diskless data communication device 6-1, all contents of the station IP table 9 itself from the non-diskless data communication device 6-1 (a part of all contents) However, any of the following failures in the non-diskless data communication device 6-1 itself can be easily dealt with. This is because each of the data communication devices to which the contents of the station IP table 9 itself have been once transferred and set can function as a backup as a specific data communication device, and therefore, when the non-diskless data communication device 6-1 is replaced. In the non-diskless data communication device after the exchange, the IP address or the contents of the station IP table 9 itself can be set by another data communication device. Incidentally, when the IP address or the station IP table 9 is set to be transferred to each data communication apparatus, to confirm that the transfer setting has been made by the specific data communication apparatus, immediately after the transfer setting, or after the specific data communication is set. Wait for the IP address setting frame receipt confirmation request from the device
A response frame indicating that the address has been set may be transmitted to the specific data communication device.

Here, the IP address request frame and the IP address setting frame will be described. An example of the format is as shown in FIG. As shown, IP header and UDP (User Datagram Protoc
ol) A header or the like is added, and a frame actually transmitted on the transmission path 4 is further provided with Ethernet, IE
Different headers such as EE802.4 or FDDI are added. Further, FIG. 6 shows an example of the structure of the IP header defined by the IP protocol, and FIG.
The respective configuration examples of the UDP header defined by the P protocol are shown. By the way, the full names or meanings of the various symbols in these figures are VER: Version IHL: Internet Header Length.
h TOS: Type of Service TL: Total Length ID: Identification FL: Flags FO: Flagment offset TTL: Time to Live PROT: Protocol HC: Header Checksum SOURCE: Source Address DEST: Destination Address OPT: option PAD: Padding SRC: Source Port LEN: Length CHK: Checksum.

When the IP address request frame is transmitted on the transmission line 4, the value of DEST (IP address of the transmission destination) in the IP header is transmitted as the broadcast designated value. The same applies when the IP address setting frame is transmitted on the transmission path 4. The value of DEST (destination port number) in the UDP header is a frame type identification number defined in advance for each of the IP address request frame and the IP address setting frame. In any case, TCP / I
In the P protocol control units 12-1 and 12-2, if the DEST value included in the UDP header in the received frame is the frame type identification number of the IP address request frame or the IP address setting frame, D in the frame
The ATA unit (DATA unit shown in FIG. 5) is transferred to the received data interpretation control units 11-1 and 11-2. FIG. 8 shows an example of the format of the DATA unit in each of the IP address request frame and the IP address setting frame. The configuration is shown.
As shown in the figure, it is composed of a command field, a command parameter 1 field, a command parameter 2 field, an optional DATA field, etc.
Specific examples of the value of the command field (hereinafter referred to as the command value), the value of the command parameter 1 field (hereinafter referred to as the command parameter value 1) and the value of the command parameter 2 field (hereinafter referred to as the command parameter value 2) And what they mean. After all, the IP address request frame to which the station number is added is received by the specific data communication device, and then the IP address setting frame to which the station number and the IP address are added is transmitted as a response to the IP address request frame. A data communication device having the same number, that is, an IP address request source data communication device receives the data, and the IP address is set as that of the own device.

Incidentally, the non-diskless data communication device 6
Under the autonomous control by -1, the non-diskless data communication device 6-1 transfers all the contents of the station IP table 9 to all the data communication devices including the replaced data communication device all at once. The case will be described below with reference to FIG. That is, when the transmission instruction from the host computer 5 indicating that is sent to the transmission data assembly control unit 10-2 via the host computer interface unit 13-2 in the data communication apparatus 1-2, transmission is performed based on the instruction. Under the control of the data assembly control unit 10-2, the entire contents of the station IP table 9 are fetched by the transmission data assembly control unit 10-2 and then assembled into a predetermined structure and then the transmission data assembly control unit 10-. 2 to TCP
The / IP protocol control unit 12-2 is instructed to send. At the time of assembly, the command value is set to 3 as shown in FIG. 9, while all the contents from the station IP table 9 are set in the arbitrary DATA field shown in FIG. From the TCP / IP protocol control unit 12-2, the entire contents from the station IP table 9 are simultaneously transmitted to all the data communication devices including the exchanged data communication device.
On the other hand, in each of all the data communication devices including the exchanged data communication device, for example, in the diskless data communication device 3-1, the contents are the TCP / IP protocol control unit 12
The data in the arbitrary DATA field is transferred to the reception data interpretation control unit 11-1 by the reception data interpretation unit 11-1 on the basis of the command value 3 of the IP table (not shown). It is what is transferred and stored above.

Finally, the configuration and operation of an example of the transmission data assembly controller 10 (10-1, 10-2) will be described in detail with reference to FIGS. 1 and 2. That is, first, when the IP address request frame is transmitted from the data communication device 1-1 to the transmission path 4,
In the reset control unit 22 in the transmission data assembly control unit 10-1, when the data communication device 1-1 is turned on, or when there is an instruction to transmit the IP address request frame from the host computer interface unit 13-1. In addition, the data assembling unit 23 is instructed to transmit the IP address request frame. Based on this instruction, the data assembling section 23 fetches the station number from the station number setting switch 7 via the station number fetching control section 21 and then assembles the DATA section (FIG. 8) of the IP address request frame and then the IP address. The TCP / IP protocol transmission interface unit 24 is instructed to transmit the request frame. Based on the instruction, the TCP / IP protocol transmission interface unit 24 causes the TCP / IP protocol control unit 12-1.
The transmission of the IP address request frame to the transmission path 4 is being performed via the.

On the other hand, when the received data interpretation control unit 11-2 in the data communication device 1-2 identifies the received frame type as the IP address request frame, the received data interpretation control unit 10-2 in the transmission data assembly control unit 10-2. The reception data interpretation interface unit 25 instructs the data assembling unit 23 to transmit the IP address setting frame based on the transmission instruction of the IP address setting frame accompanied by the station number from the reception data interpretation control unit 11-2. ing. Based on this instruction, the data assembling unit 23 is sent to the data corresponding to the station number from the station IP table 9 by using the station number as a key via the station IP table searching unit 26.
After the address is fetched, the DATA part (FIG. 8) of the IP address setting frame is assembled, and the TCP / IP protocol transmission interface part 24 is instructed to transmit the IP address setting frame. Based on the instruction, the TCP / IP protocol transmission interface unit 24 is transmitting the IP address setting frame to the transmission path 4 via the TCP / IP protocol control unit 12-2. As described above, the transmission instruction of the IP address setting frame with the station number may also be issued from the host computer 5 to the data assembling unit 23. In this case as well, in the same manner as above,
The IP address setting frames may be sequentially transmitted.

Next, the configuration and operation of an example of the received data interpretation control unit 11 (11-1, 11-2) will be described in detail with reference to FIGS. 1 and 3. That is, first, the IP address setting frame is the data communication device 1
In this case, the TCP / IP protocol control unit 12-1 of the TCP / IP-1 receives the TCP / IP.
DA through the protocol reception interface unit 35
The TA section (FIG. 8) is transferred to the data interpretation section 33. In the data interpreting unit 33, if the content of the command value in the DATA unit (FIG. 8) is the IP address setting, the station number is fetched from the station number setting switch 7 via the station number fetching control unit 34. ,
It is to be compared and collated with the station number included in the DATA section. In the comparison and collation, if the station numbers match, the IP address contained in the DATA section is stored and set in the IP address storage medium 8 via the IP address access control section 31 as the own apparatus. is there. When the IP address request frame is received by the TCP / IP protocol control unit 12-2 of the data communication device 1-2, the DATA unit (FIG. 8) of the data unit is transmitted via the TCP / IP protocol reception interface unit 35. It is transferred to the interpretation unit 33. In the data interpretation unit 33, the DATA unit (FIG. 8)
If the content of the command value in is an IP address request, the station number is extracted from the DATA section (FIG. 8),
The transmission data assembly control unit 10 is instructed to transmit the IP address setting frame via the transmission data assembly interface unit 32. In addition, in each of the reception data interpretation control units 11-1 and 11-2, when an IP address read instruction is issued from the higher-level computer interface units 13-1 and 13-2, the IP address access control unit 31 is used to execute the IP The IP address is retrieved from the address storage medium 8 and then transferred to the host computer interface units 13-1 and 13-2, or the received frame from the TCP / IP protocol control units 12-1 and 12-2 requests the IP address. If the data is other than the frame and the IP address setting frame, the data has been transferred to the host computer interface units 13-1 and 13-2.

[0024]

As described above, according to the first and second aspects, the I from each data communication device (including the one after exchange) for which the IP address needs to be transferred and set.
Waiting for a P address setting request, a data communication method that allows data communication to be performed after IP addresses are easily and quickly transferred from a specific data communication apparatus to each of the request source data communication apparatuses, and further, In the data communication system in which such a data communication method is practicable, and according to claims 3 and 4, it is determined that the IP address setting request from each data communication device other than the specific data communication device is not required. A data communication method in which an IP address can be easily and quickly transferred from the data communication apparatus to each of the data communication apparatuses and data communication can be performed, and further, such a data communication method is practicable. In the data communication system according to claims 5 and 6, even when some failure occurs in a specific data communication device, Effect without being, for all of the data communication device each on IP address is a configurable,
A data communication method capable of performing data communication, and further a data communication system in which such a data communication method is practicable, further according to claims 7 and 8, In addition to the effect, when an IP address is set by a specific data communication apparatus for each data communication apparatus for which an IP address needs to be transferred and set, it is confirmed by the specific data communication apparatus that the IP address has been set. A data communication method that is enabled, and a data communication system in which such a data communication method is enabled can be obtained.

[Brief description of the drawings]

FIG. 1 is a diagram showing a system configuration in an embodiment of a data communication system according to the present invention.

FIG. 2 is a diagram showing a configuration of an example of a transmission data assembly control unit in a diskless / non-diskless data communication device as a system component thereof.

FIG. 3 is a diagram showing an example of a configuration of a received data interpretation control unit in a diskless / non-diskless data communication device as a system component thereof.

FIG. 4 is a diagram showing a specific example of IP table contents according to the present invention.

FIG. 5 is a diagram showing a format in each example of an IP address request frame and an IP address setting frame.

FIG. 6 shows an IP defined in the IP protocol.
Diagram showing an example of header structure

FIG. 7 shows U defined in the UDP protocol.
A diagram showing a configuration example of a DP header

FIG. 8 is a diagram showing a format configuration of an example of a DATA section in each of an IP address request frame and an IP address setting frame.

FIG. 9 is a diagram showing a specific example of the DATA part and its meaning.

[Explanation of symbols]

1-1, 1-2 ... Data communication device, 2: Diskless host computer, 3-1, 3-2 ... Diskless data communication device, 4 ... Transmission line, 5 ... Host computer, 6-1, 6-2 ... Non Diskless data communication device, 7 ... Station number setting switch, 8 ... IP address storage medium, 9 ... Station IP table, 10-1, 10-2 ... Transmission data assembly control unit,
11-1, 11-2 ... Received data interpretation control unit, 12-1, 12-2 ... TCP / IP protocol control unit, 13-1, 13-2 ... Host computer interface unit

Claims (8)

[Claims] 1. A data communication method at the time of performing data communication between a plurality of data communication devices accommodated in a transmission line by the TCP / IP protocol via the transmission line,
A station number as a device identification number is fixedly assigned in advance to each of the plurality of data communication devices, and at least one specific data communication device has a correspondence relationship between the station numbers and IP addresses of all the data communication devices. Are stored in advance, among the data communication devices other than the specific data communication device, the data communication devices including the replaced data communication device and having no IP address assigned are assigned to the data communication device. While the IP address request frame to which the station number is added is transmitted on the transmission path, the specific data communication device that has received the address request frame searches for the IP address stored as a pair with the station number. In addition, the IP address setting frame to which the IP address is added By being sent to the Motomemoto data communication apparatus, in the IP address requesting data communication device is added to the IP address set frame IP
A data communication method in which an address is set as an IP address for the device itself and data communication is performed. 2. A data communication system in which data communication is performed between a plurality of data communication devices accommodated in a transmission line by the TCP / IP protocol via the transmission line, and a station as a device identification number. At least one specific data communication device among a plurality of data communication devices whose numbers are fixedly assigned in advance stores a correspondence relationship between station numbers and IP addresses for all data communication devices in advance. Stored in a pair with the station number when the IP address request frame to which the station number is added is received from each data communication apparatus that has not been set with an IP address IP address to which the registered IP address is added and the IP address is added At least a function of transmitting a setting frame to an IP address requesting data communication device, and a data communication device other than the specific data communication device, including a data communication device after replacement, having no IP address set Each communication device has a function of semi-fixedly setting a station number as a device identification number, a function of transmitting an IP address request frame added with the station number on a transmission line, and a function of responding to the IP address request frame. As a response, at least the function of receiving the IP address setting frame transmitted from the specific data communication device and setting the IP address added to the IP address setting frame as the IP address of the own device is provided. Data communication system with different configurations. 3. A data communication method when data communication is carried out between a plurality of data communication devices accommodated in a transmission line by the TCP / IP protocol via the transmission line,
A station number as a device identification number is fixedly assigned in advance to each of the plurality of data communication devices, and at least one specific data communication device has a correspondence relationship between the station numbers and IP addresses of all the data communication devices. Stored in advance, the data after exchange other than the specific data communication device under autonomous control by the specific data communication device or under the control of the specific data communication device based on an operation instruction from the outside. In each of the data communication devices including the communication device, the IP address stored as a pair with the station number assigned to the data communication device is sequentially searched, and the IP address is added to the I address.
Since the P address setting frame is transmitted via the transmission path, the IP address added to the IP address setting frame is set as the IP address of the own device in each data communication device including the replaced data communication device. And a data communication method for enabling data communication. 4. A data communication system in which data communication is performed between a plurality of data communication devices accommodated in a transmission line by the TCP / IP protocol via the transmission line, and a station as a device identification number. At least one specific data communication device among a plurality of data communication devices whose numbers are fixedly assigned in advance stores a correspondence relationship between station numbers and IP addresses for all data communication devices in advance. The data communication device for each of the data communication devices including the replaced data communication device other than the specific data communication device under the control of the address table and the autonomous control or the operation instruction from the outside. The IP address stored as a pair with the station number assigned to
At least the function of transmitting the IP address setting frame to which the P address is added is provided, while each of the data communication devices including the replaced data communication device other than the specific data communication device has a device identification number. A function to set the station number semi-fixedly, and to receive the IP address setting frame transmitted from the specific data communication device, and to set the IP address added to the IP address setting frame to the IP address of the own device. A data communication system configured to include at least the function of setting as. 5. A data communication method when data communication is carried out between a plurality of data communication devices accommodated in a transmission line by the TCP / IP protocol via the transmission line,
A station number as a device identification number is fixedly assigned in advance to each of the plurality of data communication devices, and at least one specific data communication device has a correspondence relationship between the station numbers and IP addresses of all the data communication devices. Is stored in advance in the address table,
Under the control by the specific data communication device based on the autonomous control by the specific data communication device or the operation instruction from the outside, each of the data communication devices including the replaced data communication device other than the specific data communication device On the other hand, the data communication in which the correspondence between the station numbers and the IP addresses of all the data communication devices stored in the address table is set at the same time and the data communication is performed. Method. 6. A data communication system in which data communication is performed between a plurality of data communication devices accommodated in a transmission line by the TCP / IP protocol via the transmission line, and a station as a device identification number. At least one specific data communication device among a plurality of data communication devices whose numbers are fixedly assigned in advance stores a correspondence relationship between station numbers and IP addresses for all data communication devices in advance. Address table and autonomous control, or under control based on an operation instruction from the outside, for each data communication device including the replaced data communication device other than the specific data communication device, the address table The correspondence between the station number and the IP address of each data communication device stored in While having at least the function of communicating, the station number as a device identification number is semi-fixedly set to each of the data communication devices including the replaced data communication device other than the specific data communication device. And a function of receiving the address table transmitted from the specific data communication device and setting the address table in the own device. 7. A data communication method at the time of performing data communication between a plurality of data communication devices accommodated in a transmission line by the TCP / IP protocol via the transmission line,
A station number as a device identification number is fixedly assigned in advance to each of the plurality of data communication devices, and at least one specific data communication device has a correspondence relationship between the station numbers and IP addresses of all the data communication devices. Are stored in advance, among the data communication devices other than the specific data communication device, the data communication devices including the replaced data communication device and having no IP address assigned are assigned to the data communication device. While the IP address request frame to which the station number is added is transmitted on the transmission path, the specific data communication device that has received the address request frame searches for the IP address stored as a pair with the station number. In addition, the IP address setting frame to which the IP address is added By being sent to the Motomemoto data communication apparatus, in the IP address requesting data communication device is added to the IP address set frame IP
Immediately after the address is set as the IP address for the device itself, or after waiting for an IP address setting frame receipt confirmation request from the specific data communication device,
A data communication method in which a response frame indicating that an IP address has been set is transmitted to the specific data communication device and data communication is performed. 8. A data communication system in which data communication is performed between a plurality of data communication devices accommodated in a transmission line by the TCP / IP protocol via the transmission line, and a station as a device identification number. At least one specific data communication device among a plurality of data communication devices whose numbers are fixedly assigned in advance stores a correspondence relationship between station numbers and IP addresses for all data communication devices in advance. Stored in a pair with the station number when the IP address request frame to which the station number is added is received from each data communication apparatus that has not been set with an IP address IP address to which the registered IP address is added and the IP address is added A function of transmitting a setting frame to an IP address request source data communication device, a function of transmitting an IP address setting frame reception confirmation request to the IP address request source data communication device, and a function of responding to the IP address setting frame reception confirmation request. , A function of receiving a response frame to the effect that an IP address has been set is included, and among the data communication devices other than the specific data communication device, the data communication device after replacement is included.
In each of the data communication devices with no address set, a function of semi-fixedly setting a station number as a device identification number, a function of transmitting an IP address request frame to which the station number is added on a transmission line, As a response to the IP address request frame, after receiving the IP address setting frame transmitted from the specific data communication device,
A function of setting the IP address added to the IP address setting frame as an IP address for the device itself, and an IP address setting frame receipt confirmation request from the specific data communication device immediately when the IP address is set. And a function of transmitting a response frame indicating that the IP address has been set.