JP3172038B2 - Data transfer method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention constructs a network system in which a plurality of transmission apparatuses are multiplex-connected on the same transmission line, and the addresses of the transmission apparatuses are managed by a station number and an identifier within the station number. The present invention relates to a data transfer method in which the same data is transferred from one transmission-side transmission device to another plurality of reception-side transmission devices.

[0002]

2. Description of the Related Art As a conventional data transfer system in a network system in which a plurality of transmission devices are multiplex-connected on the same transmission line, as shown in FIG. 6 , for example, three transmission devices T _{1 to} T ₃ are connected to a common transmission line. Are connected to each other with different station numbers, and a network system is constructed so as to be identifiable among the respective transmission devices T _{1 to} T _3. For example, the transmission device T _{1 is connected} to the other two transmission devices T ₂ and T ₃ . when transferring the same data, first, performs to transfer data establish a link to the transmission device T _2, which was correctly received by the transmission device T _2, the normal reception response from the transmission device T ₂ when There is received by the transmission device T _1, transfers data for the remaining of the transmission device T ₃ in the transmission device T _1, and ends the data transfer process when it receives the normal reception response.

For example, when data is individually transferred from the transmission device T _{1 having the} station number o to the transmission device T ₂ having the station number m,
As shown in FIG. 7, the data transmission management number area and a data reception management number area corresponding to the transmission devices in the transmission devices T ₁ through T ₃ provided, and transfers the data to the transmission device T ₂ from the transmission device T ₁ If the, and sm = 1 and first data transmission management number "1" increments sm corresponds to the transmission device T ₂ of the data transmission management number field of the transmission device T _1, this value is set to the data transfer control number tm (tm = 1), and transfers to the transmission device T ₂ the data transfer control number tm in addition to the transmission frame.

[0004] In the transmission device T _2, when receiving the transmission frame from the transmission device T _1, the data transfer control number tm and self data reception management number stored in the data reception management number area of ro of the transmission frame The matching is checked, and since the data reception management number ro is “0”, they do not match. Therefore, the data transfer management number tm = 1 of the transmission frame is changed to the data reception management number ro corresponding to the transmission device T ₁ to “ 1 is updated to ", then returns a response indicating normal reception state to the transmission device T ₁ performs reception time internal processing.

When receiving a response from the transmission device T _2, the transmission device T ₁ increments its own data transmission management number sm by “1” when there is data to be transferred to the transmission device T ₂ again, and sets sm = 2 as well as, the data transfer control number tm "2" is set to, which transfers to the transmission device T ₂ added to the transmission frame. Upon reception of this transmission frame at the transmission apparatus T _2, the data transfer control number tm (= 2) with its own data reception control number ro (=
Since the data reception management number ro does not coincide with the data transfer management number tm = 2, the data reception management number ro is updated (r).
o = 2). At this time, when there is an abnormality in the data in the transmission frame received by cyclic check or the like in the internal reception processing, returns an abnormal reception response representing this fact to the transmission device T _1.

[0006] Upon receiving the abnormal reception response by the transmission device T _1, it is determined that an abnormality has occurred in the data transfer to the transmission device T _2, and transfers the same data as the previous transmission device T ₂ again. At this time, since the data is retransmitted, the data transmission management number sm and the data transfer management number tm added to the transmission frame are not updated, and both maintain the previous value “2”. Therefore, the transmission device T ₂ has received the transmission frame, the data transfer control number of the received transmission frame tm
Since (= 2) is equal to its own data reception management number ro (= 2), it is determined that the data is to be retransmitted, and the data reception management number ro (= 2) and internal processing at the time of data reception are not performed. It returns a normal reception response to the transmission device T _1.

[0007]

However, in the above-mentioned conventional data transfer method, a plurality of transmission devices connected to a common transmission line are identified only by the station number, so that one transmission is performed. Even when the same data is transmitted from a device to a plurality of other transmission devices, one transmission device must be designated by the transmission side and data transfer must be performed only for this transmission device. Even if a multiplexing station is formed by providing the same station, the transmitting station must follow the procedure of transferring data and processing the response from the receiving station for each multiplexing station. There is an unsolved problem that it takes time to transfer the same data to the multiplexing station.

[0008] Further, the data transfer is performed by a data transmission management number,
Even in the case of management using the data transfer management number and the data reception management number, when a plurality of stations are provided in the same station number and a multiplexing station is formed, the same data is simultaneously transmitted to the multiplexing stations in the same station number. Unresolved problem that if batch transfer is attempted, when data is retransmitted due to an error in data transfer, multiple stations within the same station number will receive duplicate data, making it impossible to perform transmission / reception management There is.

The present invention has been made in view of the above-mentioned unsolved problems of the conventional example. When a plurality of stations are provided in the same station number and a network is constructed as a multiplexing station, the transmitting station is used. Allows batch transfer of data to multiplexing stations within the same station number, and when there is a receiving station that cannot normally receive the batch-transferred data, the other receiving stations receive duplicate data. It is an object of the present invention to provide a data transfer method capable of preventing such a situation.

[0010]

According to a first aspect of the present invention, there is provided a data transfer method, wherein a plurality of transmission apparatuses are multiplex-connected on the same transmission line, and an address of each transmission apparatus is designated by a station number and a station number. build a network system managed by an identifier, in a data transfer method which is adapted to transfer the same data from one transmission-side transmission apparatus within the network system to the other of the plurality of receiving-side transmission apparatus, wherein each transmission
Data transmission represented by the product of the station number and multiplexing number for each device
A data management number area and a data reception management number area
The transmission equipment on the transmitting side identifies multiple station numbers within the same station.
When the same data is transferred collectively to the child receiving transmission device
To the transmission frame, add the data transfer management number for the number of stations.
It is characterized in that it has to so that.

[0011]

[0012]

In the data transfer method according to the first aspect, a network system is constructed in which each address of a plurality of transmission devices multiplexed and connected to the same transmission line is constituted by a multiplexing station using a station number and an identifier within the station number. A data transmission management number area and a data reception management number area represented by the product of the station number and the multiplexing number in each transmission apparatus to form an individual management area for each transmission apparatus; When the same data is transferred collectively to a plurality of receiving transmission devices within the same station number, a data transmission management number is added to the transmission frame by the number of stations, so that the receiving transmission device transmits data addressed to itself. By collating the transfer management number, duplicate reception of transfer data is prevented.

[0013]

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a first embodiment of the present invention. In the figure, reference numeral 1 denotes a common transmission line.
For example, one transmission-side transmission device T and a plurality of, for example, two reception-side transmission devices R ₁ and R ₂ are connected. here,
The receiving-side transmission devices R ₁ and R ₂ are set to have the same station number but different identifiers (suffixes) in the station numbers, and the station numbers of these transmission devices R ₁ and R _{2 and} the station number of the transmitting-side transmission device T ₁ are different. It is set differently.

The transmission device T on the transmission side includes a communication control device 10 for controlling communication with another transmission device via the communication line 1;
The communication control unit 10 and the main storage device 30 and the arithmetic processing unit 40 are configured to perform predetermined arithmetic processing based on an arithmetic processing program stored in the main storage device 30. Connected. The communication control unit 10 includes a communication processing unit 12 that performs a communication control process with another transmission device based on a communication processing program stored in an internal ROM 11, and a communication line 1 based on a communication start command from the communication processing unit 12. A line control unit 13 for performing line control processing with the internal memory 14, and a bus interface unit 15 for performing communication control processing with the bus 45. These are connected via an internal bus 16.

The communication processing unit 12 performs communication processing based on the communication processing program, and when receiving a data transfer request from the arithmetic processing unit 40, stores the data in the data area 30a of the main storage device 30 via the bus interface unit 15. The read transmission data is sequentially read out, and as shown in FIG. 2, a start flag SF indicating at least the start of a frame, a transfer destination address field indicated by a transfer destination station number specified in the data transfer request and an identifier within the station number. Ad, a header part Fh including a transfer source address field As represented by a transfer source station number and a data length Bn of transfer data, and a frame check code CH generated by, for example, a cyclic method for detecting a transmission error. And an end flag EF indicating the end of the frame to form a transmission frame F,
This is stored in the transfer data storage area 1 formed in the internal memory 14.
Stores in 4a, when the line connection with the receiving-side transmission apparatus R ₁ and R ₂ of the transmission destination line control unit 13 is completed, the transmission path of the transmission frame F stored in the transfer data storage area 14a 1 And collectively transfer to the receiving-side transmitting devices R ₁ and R ₂ of the same station number, and when a receiving response is returned from each of the receiving-side transmitting devices R ₁ and R ₂ , it is determined whether or not the reception is normal. By making a determination, transfer processing of new transfer data or retransmission processing of transfer data at the time of abnormal reception is performed. Here, as shown in FIG. 3, the transfer destination address field Ad is a station number storage unit Ad ₁ for storing the station number of the receiving-side transmission device.
, Followed by the station number identifiers s _{1 to} s _n .

On the other hand, the receiving-side transmission devices R ₁ and R ₂ have substantially the same configuration as the transmitting-side transmission device T, and
0, a main storage device 70 and an arithmetic processing unit 80, which are connected via a bus 85. Here, the arithmetic processing unit 80 performs a predetermined process based on the arithmetic processing program stored in the main storage device 70 and the received transmission frame F stored in the data area 70a.

A communication control unit 50 executes a predetermined communication process based on a communication processing program stored in an internal ROM 51, and a communication line based on a communication start command from the communication processing unit 52. R, a line control unit 53 for performing line control processing, an internal memory 54, and a bus 8
And a bus interface unit 55 for performing communication processing with the communication interface 5. These are connected via an internal bus 56.

In the internal memory 54, a reception data area 54a for temporarily storing the received transmission frame F is formed. The communication processing unit 52 performs a communication process based on a communication processing program stored in the internal ROM 51, outputs a communication start command to the line control unit 53 at a fixed period set in advance, and receives a communication end notification from the line control unit 53. When input, the transmission frame F stored in the reception data area 54a
When the result of dividing by the generator polynomial is “0”, the transmission frame F
Is acknowledged normally, an acknowledgment (ACK) is returned to the transmission device T on the transmission side, and the reception data area 54 is received.
The data portion Fd of the transmission frame F stored in the main storage device 70 is stored in the reception data area 70a corresponding to the transfer source station number As in the main storage device 70, and the fact is notified to the arithmetic processing device 80,
If the remainder is other than “0”, it is determined that the reception of the transmission frame F is abnormal, and a negative acknowledgment (NAC) is returned to the transmission side transmission device T.

At this time, the transmission devices R ₁ and R
_{In No. 2} , response transmission times τ ₁ and τ ₂ from when the transmission frame F addressed to itself is received to when an acknowledgment or a negative response is returned are set to different times in advance. That is, for example, the response time τ ₁ is set to be equal to or longer than the time required for the transmission device T to receive the reception response after transmitting the transmission frame F, and the response time τ ₂ is set to the transmission time τ ₁ processes the received response from the receiving side transmission apparatus R ₁ in side transmission device T, is set to a time obtained by adding the next reception response over time required to reach a possible reception time.

Then, a communication start command and a transmission frame F are output to the line controller 53, and when the communication end notification is received from the line controller 53, it is recognized that the transfer of the transfer data has been completed. When a communication start command is input from the communication processing unit 52, the line control unit 53 performs a line control process with the communication line R to receive the transmission frame F addressed to itself, and It is stored in the area 54a.

Next, the operation of the above configuration will be described. Now, as shown in FIG. 4, assuming that the transmitting-side transmitting apparatus T designates receiving-side transmitting apparatuses R ₁ and R ₂ having the same station number and performs data transfer at time t ₁ , When the communication processing unit 12 receives a data transfer request from the arithmetic processing unit 40, the designated transfer data is sequentially read from the data area 30a of the main storage device 30, and the read data is represented by a start flag SF, a transfer destination station number, and an identifier within the station number. The transfer destination address Ad of the receiving side transmission devices R ₁ and R ₂ to be formed, the source address As including the own station number, and the header portion Fh composed of the data length Bn are formed. Is formed, and finally a frame check code CH and an end flag EF generated by the cyclic method are added to form a transmission frame F, which is stored in the internal memory 13. Line stores the transfer data storage area 14a, and sends a communication start command to the line control unit 13, with respect to the line control unit 13 the reception side via the communication line 1 in the transmission apparatus R ₁ and R ₂ When the connection is completed, the transmission frame F stored in the transfer data storage area 14a is transmitted to the communication line 1 via the line control unit 13.

In the receiving side transmission device R ₁ , the communication processing unit 52
The transmission frame F is received by the line control unit 53 in accordance with the command (1), and is temporarily stored in the reception data area 54a of the internal memory 54 in the communication control device 50. At this time, the communication processing unit 52 refers to the transfer destination address field Ad included in the transmission frame F to determine whether or not the transmission frame is addressed to itself. When the transmission frame F stored in the reception data area 54a of the transmission frame F is deleted and the transmission frame F is addressed to itself, a communication end notification indicating that the transmission frame F has been stored is received from the line control unit 53. At the time, the frame of the transmission frame F is checked, and the result is divided by the generator polynomial. As a result, if the remainder is “0”, it is determined that the transmission frame F has been normally received, and an acknowledgment (ACK) is set in advance. response transmission time tau ₁ is returned to the transmitting-side transmission device T at a time t ₂ has elapsed the.

In the transmitting side transmitting apparatus T, the receiving side transmitting apparatus R
_When an acknowledgment from ₁ is received at time t ₃ , the reception processing is performed, and then a reception standby state is established so as to receive an acknowledgment or a negative acknowledgment from another receiving-side transmission device R ₂ . On the other hand, in the receiving side transmission apparatus R _2, similarly to the receiving-side transmission apparatus R ₁ described above, at time t ₁ which has received the transmission frame F addressed to, performs frame check, as a result of the division by the generator polynomial, When the remainder is “0”, it is determined that the transmission frame F has been normally received, and an acknowledgment (ACK) is longer than a predetermined response time τ _{1 of} another reception-side transmission device R ₁ from the reception time t _1. At the time point t ₄ when the response time τ ₂ has elapsed, the data is returned to the transmitting side transmission device T.

In the transmitting side transmitting apparatus T, the receiving side transmitting apparatus R
Upon receiving an acknowledgment from ₂ at time t _5, after performing the reception process on, checks whether the transmission frame F is present for the reception side transmission apparatus R ₁ and R ₂ again, a new transmission frame If F exists, the above data transfer is repeated, and if there is no new transmission frame F, the transmission process ends.

Also, when the transmission frame F is transferred from the transmission side transmission apparatus T to the plurality of reception side transmission apparatuses R ₁ and R ₂ , for example, when the reception side transmission apparatus R ₁ checks the frame of the transmission frame F. If the result of the division by the generator polynomial indicates that the remainder is other than “0”, it is determined that the reception of the transmission frame F is abnormal and, as shown in FIG. negative response at time t ₂ the response time tau ₁ which is set in advance from t ₁ has elapsed (NAC)
Is returned to the transmission device T on the transmission side.

On the other hand, since the other receiving side transmission device R ₂ normally receives the transmission frame F, the transmission frame F
Reception time t ₁ the response time from tau ₂ sends back an acknowledgment (ACK) at time t ₄ when the course of. Then, the transmission device T ₁ receives a negative acknowledgment (NAC) from the reception device R ₁ at time t ₃ , and thereby receives the transmission device R _1.
Receiving abnormality was recognized, retransmission processing i.e. the destination address of a transmission frame F relative to the receiving-side transmission apparatus R ₁ having abnormally received from the time t ₅ that has received acknowledgment (ACK) from the other receiving-side transmission apparatus R ₂ in new transmission frame F is set only station number and the station number in the identifier of the receiving-side transmission apparatus R ₁ to Ad
It is formed and transferred to the receiving-side transmission apparatus R ₁ this at the time t _6.

Upon receiving the new transmission frame F normally, the receiving-side transmission device R ₁ transmits an acknowledgment (ACK) at a time t ₇ when a preset response time τ ₂ has elapsed from the reception time t _6. To the transmission device T at the time t
₈ , when the transmitting side transmitting apparatus T receives, the receiving side transmitting apparatus R
₁ can be confirmed, and thereafter, it is confirmed whether or not there is a new transmission frame F to be transferred. If a new transmission frame F exists, this is transferred and a new transmission frame F is transferred. If the transmission frame F does not exist, the transmission processing ends.

As described above, according to the above configuration , the response time τ ₁ when returning a response to the transmission side transmission apparatus T from the point of time when the transmission side frame R is received by the reception side transmission apparatuses R ₁ and R ₂ within the same station number. And τ ₂ are different from each other, so that a plurality of reception-side transmission devices R ₁ within the same station number are transmitted from the transmission-side transmission device T.
And when the batch transfer the transmission frame F simultaneously to R _2, to be reliably received by the transmitting-side transmission device T at different timings acknowledgment or negative acknowledgment from the receiving-side transmission apparatus R ₁ and R ₂ In addition to this, the processing for the received response can be performed reliably, and the transmission processing time is greatly reduced as compared with the case where the transmission frame F is individually transferred to a plurality of receiving-side transmission devices as in the conventional example. Can be shortened.

In this embodiment, in addition to the above configuration ,
When batch transfer of the same data to a multiplexing station having the same station number is performed, duplicate reception of transfer data is prevented by adding a data transfer management number to the transmission frame for the number of stations. That is, as shown in FIG. 1 , the transfer data storage area 14 in the internal memory 14 of the transmission device T on the transmission side.
In addition to the management number storage area 14b, and 14c for storing the data transfer control number is provided for each receiving-side transmission apparatus R ₁ and R ₂ on the data transfer destination a, the receiving side transmission equipment R
When performing to data transfer collectively to ₁ and R _2,
Although updated and stored each management ID storing data transfer management number stored in the area 14b and 14c "1" is counted up to the transmission frame when the produced reception error on the receiving side transmission apparatus R ₁ or R ₂ when retransmitting F, the update of the data transfer control number is canceled, when transmitting the transmission frame F to the receiving side transmission apparatus R ₁ and R _2, each receiving side transmission equipment a transmission frame F R for ₁ and R ₂ that sends adds data transfer control number.

Also, for the receiving-side transmission devices R ₁ and R ₂ , a management number storage area 54 b for storing the reception data management number for the transmitting-side transmission device T is provided in the internal memory 54. When the transmission frame F from the transmission device T is normally received, the reception data management number stored in the management number storage area 54b is counted up by "1", updated and stored, and the reception of the transmission frame F is abnormal. when it is configured to stop the updating of the management number, the time of returning an acknowledgment ACK or negative acknowledgment NAC to the transmitting-side transmission apparatus T, the received data managing stored in these management number storage area 54b back to the transmitting-side transmission device T by adding a number.

[0032] Next, the operation of the above you施例. When the arithmetic processing unit 40 of the transmitting-side transmission apparatus T has a data transfer request to the receiving-side transmission apparatus R ₁ and R _2, as shown in FIG. 5, first, the communication processing unit 12, the transfer management of the internal memory 14 The data transfer management numbers ts ₁ and ts ₂ for the respective receiving-side transmission devices R ₁ and R ₂ stored in the number storage area 14 b and the call 14 c are counted up from “0” to “1”, and updated and stored. The data transfer management numbers ts ₁ and ts ₂ are added when creating the transmission frames F for the respective receiving-side transmission devices R ₁ and R _2, and the transmission frames F are transmitted via the communication line 1 to the receiving-side transmission devices R ₁
And batch transfer to R _2.

In the receiving side transmission device R ₁ , the transmission frame F
Is received, the data management number ts _{1 of} the received transmission frame F and the management number storage area 5 of its own internal memory 54 are received.
4b received data management number tr ₁ (=
0), the two do not match, so the data management number ts ₁ (= 1) of the transmission frame F is
Is updated and stored as the received data management number tr ₁ (= 1), and the transmission-side transmission device T is affirmed at time t ₁ assuming that the transmission frame F has been normally received by performing the predetermined internal processing at the time of reception. A response ACK is returned.

On the other hand, the receiving side transmission device R ₂ receives the data transfer management number tr ₂ (= 1) of the received transmission frame F and the received data management number tr ₂ stored in its own received data management number storage area 54b. (= 0), the two do not match, so that the data management number ts ₂ (= 1) of the transmission frame F is updated and stored as the received data management number tr ₂ (= 1) for the transmission device T on the transmission side. when the reception error of the transmission frame F is generated by performing a predetermined reception time internal processing returns a negative response NAC to the transmitting-side transmission device T at a time t ₃ when later than time t _1.

The transmitting side transmitting apparatus T confirms the normal reception at the receiving side transmitting apparatus R ₁ by receiving the acknowledgment ACK from the receiving side transmitting apparatus R ₁ at the time point t ₂ , and a predetermined response is received. performs the internal processing, by receiving a negative acknowledgment NAC from the receiving side transmission apparatus R ₂ at time t _4, check the reception abnormality in the receiving-side transmission apparatus R _2, caused a reception error at time t ₅ retransmits the transmission frame F only to the receiving side transmission apparatus R _2. At this time, is a retransmission of a transmission frame F, updating is not performed in the receiving side transmission apparatus R ₂ data transfer control number ts ₂ for the (= 1), the transmission frame F to this data transfer control number ts ₂ (= 1) added to retransmit to the receiving side transmission apparatus R ₂ in.

The transmission frame F is transmitted to the reception-side transmission device R _2.
, The data transfer management number ts ₂ (= 1)
Since the received data management number tr ₂ (= 1) stored in its own management number storage area 54b matches, the transmission frame F is recognized as being retransmitted, and the received data management number tr ₂ is updated. done without, performs predetermined reception time internal processing, when the normal reception is a time t ₇ acknowledgment ACK
Is returned to the transmission device T on the transmission side.

At time t₈At the transmitting side transmission device T
Transmitter R_TwoReceiving an acknowledgment ACK from
Receiving-side transmission device R_TwoConfirm normal reception at
After completing internal processing, perform new data transfer processing.
U. At this time, the time t₉In the transmitting side transmission device T
The receiving side transmission device R ₁Data transfer required only for
Request, the management number stored in the internal memory 14 is stored.
Data transfer management number ts stored in area 14b₁
Is updated from 1 to 2 and stored.
This data transfer management number ts₁(= 2) is the transmission frame
F, and the receiving-side transmission device R₁Transfer to

The receiving-side transmission device R _{1 that} has received the transmission frame F receives the data transfer management number ts ₁ (= 2) added to the transmission frame F and the reception number stored in its own management number storage area 54b. Data management number tr ₁ (=
1), and the two do not match. Therefore, the value of the data transfer management number ts ₁ added to the transmission frame F is updated as the reception data management number tr ₁ (= 2). Assuming that
An acknowledgment ACK is returned to the transmitting side transmission device T at a time t _10.

Thereafter, at the transmission side transmission device T, the time t ₁₁
Receives an acknowledgment ACK from the receiving-side transmission device R ₁ , performs predetermined internal processing during transmission, and performs
Check the normal reception of _one, then when the check to see whether the processing unit 40 there is a new data transfer request performs data batch transfer for each receiving-side transmission apparatus R ₁ and R ₂ , the receiving side transmission apparatus in the same manner as the time t ₁ at t ₁₂ R ₁
The data transfer control number ts ₁ "2" to "3" for
Updates stored and with updates stored in "2" from the data transfer control number ts ₂ "1" with respect to the receiving-side transmission apparatus R _2, updated data transfer control number ts ₁ (= 3) and ts ₂ (= 2) is added to the transmission frame F and transferred to the receiving side transmission devices R ₁ and R ₂ .

The receiving-side transmission devices R ₁ and R ₂ receive the transmission frame F, and receive the reception data management number tr ₁ (= 2) and the reception data management number tr ₁ (= 2) stored in the management number storage area 54b of the internal memory 54. tr ₂ (= 1) and the data transfer management number ts ₁ added to the transmission frame F
Since (= 3) and ts ₂ (= 2) do not match, the received data management number tr ₁ is changed from “2” to “3” and the received data management number tr ₂ is changed from “1” to “2”, respectively. Assuming that the data is updated and stored and the transmission frame F is normally received,
An acknowledgment ACK from the receiving-side transmission apparatus R ₁ at time t ₁₃ back to the transmitting-side transmission device T, which predetermined that receives finished internal processing when a predetermined transmission at the transmitting side transmission apparatus T is the time t ₁₄ receiving-side transmission apparatus R when t ₁₅ that the response time tau ₂ has passed
_An acknowledgment ACK is sent back to the transmission device T from ₂ .

Hereinafter, in the transmission device T on the transmission side, the transmission device on the reception side
Device R₁And / or R_TwoTransfer data exists for
In the case, the management number of the internal memory 14 is stored at the time of the transfer.
Data transfer stored in the areas 14b and / or 14c
Transmission control number ts₁And / or ts_Two"1" only
And save the updated data and transfer the updated data
Management number ts₁And / or ts_TwoTo the transmission frame F
In addition, the receiving side transmission device R₁And / or R_TwoTransfer to
Receiving transmission device R that has received the transmission frame F of ₁as well as/
Or R_TwoNow, the data added to the transmission frame F
Transfer control number ts₁And / or ts_TwoAnd own control number
Received data management number t stored in storage area 54b
r₁And / or tr_TwoIf they do not match,
Transfer control number ts₁And / or ts_TwoThe value of the received data
Management number tr₁And / or tr_TwoDo you remember as update
Returns a response, and if they match, the data transfer control number
tr₁And / or tr_TwoSend back a response without updating.

[0042] Thus, according to the above you施例manages the data transfer control number ts ₁ and ts ₂ on the transmitting side transmission equipment T for each receiver-side transmission apparatus R ₁ and R _2,
These are added to the transmission frame F, and the receiving side transmission device R
₁ and R ₂ , and the receiving side transmission devices R ₁ and R ₂ also manage the received data management numbers tr ₁ and tr _2. Therefore, when data is collectively transferred to a plurality of receiving side transmission devices. In addition, it is possible to accurately manage the transfer management number, and it is possible to reliably prevent transfer data from being redundantly received.

[0043] In the above you施例, the case has been described where the receiving-side transmission apparatus in the same station number is two, the present invention is not limited thereto, any number of the receiving side in the same station number A transmission device can be arranged. Also on
In you施例it has been described as being set to the transmitting side transmission equipment T and the receiving-side transmission apparatus R ₁ and R _2,
These may be mutually transmitted and received, and an arbitrary number of sets for mutually transferring data can be set. In this case, the transmitting side transmitting apparatus and the receiving side transmitting apparatus respectively have the station number and the multiplexing number. What is necessary is just to provide the data transmission management number area and the data reception management number area represented by the product of the numbers.

[0044]

As described above, according to the data transfer method of the first aspect, a plurality of transmission devices are multiplex-connected on the same transmission line, and the address of each transmission device is managed by the station number and the identifier within the station number. In a data transfer system in which the same data is transferred from one transmission-side transmission device to another plurality of reception-side transmission devices in the network system, a station number is assigned to each of the transmission devices.
Data transmission control number area expressed by the product of the number and the number of multiplexes
And a data reception management number area,
Is the receiver-side transmission of multiple station number identifiers in the same station.
When transmitting the same data to the
Since the data transfer control number was set to add a few minutes stations, a plurality of receiving-side transmission in the same code from the transmitting side transmission equipment
Even if the same data is batch-transferred to the device,
Management of data transfer management number in the device and the receiving side transmission device
As a result , the same data can be reliably received at the receiving-side transmission device, and the same data can be reliably prevented from being received.

[0045]

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a transmission frame.

FIG. 3 is an explanatory diagram showing a data transfer destination address field in a transmission frame.

FIG. 4 is an explanatory diagram showing a data transfer procedure in a case where a transmission frame is collectively transferred from a transmission-side transmission device to a plurality of reception-side transmission devices.

FIG. 5 is a diagram illustrating a case where data is transmitted from a transmission device to a plurality of reception devices.
Batch transmission of transmission frames to which
FIG. 8 is an explanatory diagram showing a data transfer procedure in a case where the data transfer is performed.

FIG. 6 is an explanatory diagram showing a conventional data transfer method.

FIG. 7 shows data transfer using a conventional data transfer control number.
FIG. 4 is an explanatory diagram showing a transmission method.

[Reference Numerals] 1 communication line T transmitting side transmission apparatus R _1, R ₂ receiving side transmission equipment 11 and 51 inside ROM 12, 52 communication processing section 13 and 53 line control unit 14, 54 an internal memory 14a the transmission data storage area 30 , 70 Main storage device 40, 80 Arithmetic processing unit 54a Received data storage area 14b, 14c Data transfer number storage area 54b Received data number storage area

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04L 12/28

Claims (1)

(57) [Claims] 1. A network system in which a plurality of transmission apparatuses are multiplex-connected on the same transmission line, and an address of each transmission apparatus is managed by a station number and an identifier within the station number, and one transmission-side transmission apparatus in the network system is provided. In the data transfer method in which the same data is transferred to a plurality of other receiving-side transmission devices, the number of station numbers and the number of
Data transmission control number area and data expressed as the product of
The transmission side transmission device is provided with a
The same number of identifiers in a station number
When transferring one data at a time, the data
A data transfer method characterized in that transfer management numbers are added for the number of stations .