JPH09162948A - Data communication method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily detect the transmission completion of data on one group, which is constituted by means of plural frames, in a data communication equipment. SOLUTION: A transmission completion address table AT constituted by the addresses of areas storing the transmission completion flags of a frame management part at the last of a frame management queue on frame formats Q11, Q12 and Q13 is provided. When a control operation means 1 transmits data of one group generated by a frame management queue CQb having the transmission format Q12, for example, the control operation means 1 retrieves the storage address EAB of the transmission completion flag of the frame management part (b) at the last of the frame management queue CQb, stores the address in a transmission completion address register AR. Whenever a transmission/reception part 6 outputs the signal of the transmission completion of one frame, the control operation means 1 judges the content, of the address which the transmission completion address register AR shows and detects the transmission completion of data of one group.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data communication method for transmitting a group of data consisting of a plurality of frames in an optimum frame transmission order according to the state of the network and the state of the local station.

[0002]

2. Description of the Related Art FIG. 8 shows a block diagram of a data communication device CA as an example of a data communication device. Data communication device CA
Is composed of control calculation means 1, program storage means 2, data storage means 3, input device 4, display device 5, and transmission / reception unit 6. The program storage unit 2 is a storage unit that stores a program that is executed by the control calculation unit 1 and that realizes the function of the data communication device CA.
A basic program that is a program that implements the basic functions of the data communication device CA such as processing of inputting signals from the input device 4 and processing of displaying data on the display device.
A transmission control program P1 which is a program for controlling data transmission between the P0 and the outside executed via the transmission / reception unit 6.
And are stored. The data storage means 3 is a data storage means for storing data to which the control calculation means 1 refers when executing a program, data generated by the control calculation means 1, data input / output via the transmission / reception unit 6, and the like. In the data storage means 3, a reception data area RDA for storing the reception data input via the transmission / reception section 6,
A transmission data area TDA for storing transmission data output via the transmission / reception unit 6 is secured.

FIG. 9 is an explanatory view of the operation of the data communication device CA shown in FIG. 8 when transmitting data held by the data communication device CA. In the figure, 1 and 6 are the same as the control calculation means 1 and the transmission / reception unit 6 of the data communication device CA shown in FIG. FR is a diagram showing one frame (which will be referred to as a frame FR in the following description) transmitted to another data communication device connected to the network. The frame FR is a signal indicating the beginning of the frame and a frame. A group of data consisting of a bit string of binary signals separated by a signal indicating the end,
Information to notify the other station of the start of transmission, the frame head FH consisting of data representing the source address and the destination address, the data subject MD that is the data to be transmitted, the frame inspection data and the end of the frame. It consists of the FE at the end of the frame, which consists of the signal to be transmitted. The frame management unit FD and the transmission data area BD are data areas provided in the data storage unit 3 and constitute a data block DB corresponding to one frame, and the transmission / reception unit 6 is a head address of the data block DB. Yes,
And the start address FDTA which is also the start address of the frame management section FD
Is passed from the control calculation means 1, and this frame management unit FD
A frame FR is formed according to the contents of the transmission data area BD and is transmitted to the network.

When a plurality of frames are continuously output, the frame management unit FD includes a head address NFP of the frame management unit for the next succeeding frame and data indicating whether or not the transmission is completed. A certain transmission completion flag EF, first transmission control data TCD1 including data such as a transmission source and a transmission destination,
Data including a transmission data pointer BDP, which points to the head address BDT of the transmission data area BD in the transmission data area BD managed according to the contents of the frame management unit FD, is stored. Further, the transmission data area BD is composed of an area for storing the transmission data TD forming the main body of the transmission data and an area for storing the second transmission control data TCD2 defining the attributes of the transmission data. In the following description, the data storage means 3
The code added to the data stored in and the code added to the storage area of this data will be described with the same reference numerals.

Next, the operation of transmitting one frame of data from the data communication device CA will be described with reference to FIG. The control calculation means 1 (see FIG. 8) is the transmission control program P1.
(See FIG. 8) is executed, and in the initial setting of the transmission control, the frame management unit FD is formed in the frame management area FD of the data storage means 3, and the second is set in the transmission data area BD pointed to by the transmission data pointer BDP. Forms transmission control data TCD2,
Reserve the area for the transmission data TD. When the data to be transmitted is generated, the control calculation means 1 stores the data to be transmitted in the transmission data area TD. Data block
When transmitting the DB, the control calculation means 1 passes the head address FDTA of the frame management unit FD to the transmission / reception unit 6. Transmitter / receiver 6
Starts the transmission process when the head address FDTA is passed. The transmission / reception unit 6 is the head address FD of the frame management unit FD.
TA sequentially refers to the contents of the frame management unit FD, then specifies the contents of the transmission data area BD with the transmission data pointer BDP, and the contents of the frame management unit FD and the transmission data area BD
The frame FR is generated from the contents of the above, and the frame FR is sequentially output to the network from the transmitting end of the transmitting / receiving unit 6 as a bit string.

Data to be treated as one group is 1
If it is larger than the amount handled as a frame or if the data formation time is long, divide it into frames of appropriate length, or divide into multiple frames according to the order of the data formation and transmit. The processing efficiency of the entire network can be improved. In FIG. 10, a group of data, which is applied in the above-mentioned case, is divided into a plurality of frames FRa,
An explanatory diagram of a process of outputting as a continuous frame group such as FRb is shown, and with reference to this diagram, a process of continuously transmitting data composed of a plurality of frames will be described as an example.

For example, in the case of transmitting a group of data consisting of transmission data A, B, C, D to be transmitted as one frame, the frame management units a, b, c, d corresponding to these respective data. And the contents of the next frame management unit start address NFP of the frame management unit a (abbreviated as next address NFP; see FIG. 9) are set as the start address of the frame management unit b. Below, the contents of the next address NFP of the frame management unit b are stored in the frame management unit c at the head address of the frame management unit c.
The next address NFP is set to the head address of the frame management section d. A code indicating that there is no subsequent frame management unit is stored in the area of the next address NFP of the frame management unit d. As described above, the four data blocks DB1 including the four transmission management units a, b, c and d and the four transmission data A, B, C and D under the control of the respective transmission management units. , DB2,
DB3 and DB4 are formed.

When transmitting a group of data consisting of the data blocks DB1, DB2, DB3, DB4, the control operation 1 is the head address of the data block DB1, that is, the head address of the transmission management section a.
The FDTA is passed to the transmitter / receiver 6. As described above, the transmitting / receiving unit 6 first forms the frame FRa from the data block DB1 and transmits the frame FRa. When the transmission of the frame FRa is completed, the transmission / reception unit 6 sets the transmission completion flag Fa of the frame management unit a to a binary number 1 which means the completion of transmission, enters the process of the frame management unit b according to the designation of the next address, and the data block DB2 Is processed and the frame FRb is transmitted. When the transmission of the data block BD4 ends at the end, the contents of the next address NFP of the frame management unit d is a transmission completion code indicating that there is no subsequent frame management unit. The unit 6 is in a state in which the transmission of the first group of data has been completed.

In the data communication device CA, when a group of data composed of a plurality of frames is transmitted as described above, the control operation 1 includes a group of data of the transceiver 6 in relation to other processing. Immediate detection of the transmission completion of the transmission is required. Fig. 11 shows 1 consisting of multiple frames.
The explanatory view showing the method of detecting the completion of transmission when transmitting data of a group is shown. A method of detecting the completion of transmission of the data of one group will be described with reference to this drawing.

In the figure, reference numeral 1 is a control operation means, and 6 is a transmission / reception unit, which is the same as the one with the same reference numerals shown in FIG. 8 or 9. a, b, d are frame management units, and A, B, D are frame management units a, b, d, respectively.
Is a transmission data area under the control of the above, and is the same area as the data area of the same symbol shown in FIG. Transmitter / receiver 6 is 1
Every time the transmission of one frame is completed, an interrupt signal indicating that the transmission of one frame is completed is controlled. Calculation 1
Output to The control calculation means 1 which has received this signal first inputs the contents of the transmission completion flag Fa of the frame management part a to make a judgment. Detects the incomplete transmission of. If the flag
If the content of Fa is 1, which is a value indicating completion of transmission, the content of the transmission completion flag of the next frame management unit b is determined. In the same manner, Fc and Fd are sequentially determined, and the final frame management unit d
When it is detected that the value of the transmission completion flag Fd is 1, which is a value indicating the completion of transmission, it is determined that the transmission of the data of the first group is completed.

In the method of detecting the completion of the transmission of the data of the first group shown in FIG. 11, the completion flag Fa of the head frame management section a is checked every time the interrupt signal from the transmission / reception section 6 is input. There is a drawback that the detection time is too long. FIG. 12 shows another method of detecting the completion of transmission of a group of data when transmitting a group of data composed of a plurality of frames. In the figure, 1 is a control calculation means, 6
Is a transmission / reception unit, and is the same as that of the same symbol shown in FIG. 8 or 9. 9A and 9B are frame management units, and A, B and D are transmission data areas under the control of the frame management units a, b and d, respectively.
This is the same area as the data area of the same reference sign shown in. MF
Is an area for storing the address of the transmission completion flag of the frame management unit of the next succeeding frame detected at the time of receiving the interrupt signal indicating that the transmission of the frame from the previous transmission / reception unit 6 is completed. Is. When the control calculation unit 1 receives the interrupt signal from the transmission / reception unit 6 indicating that one frame has been transmitted, the next completion flag address storage area
The transmission completion flag at the address indicated by the contents of the MF is determined, and if the frame management unit storing this completion flag is the frame management unit of the final frame, it is determined that the transmission of the group of data has been completed. When this frame management unit is not the frame management unit of the final frame, the address of the completion flag of the next frame management unit is stored in the next end flag address storage area MF.

In the following description, the format of the transmission order of the frames of a group of data that are connected and transmitted by the frame management units that are sequentially processed, such as the frame management units a and b, will be referred to as a frame format. As described above, the frame management unit is a portion that forms the first half of the data block, so the frame format matches the data block arrangement order format.

FIG. 13 shows an example of the frame format.
In the figure, Q11 is a frame format in which the frame management units a, b, c, d are arranged in the order, and Q12 is a frame format in which the frame management units a, c, d, b are arranged in the order. Frame formats Q11 and Q12 are
Although it is composed of the same individual frame management units, the arrangement of the frame management units that determines the frame transmission order is different. Data transmission efficiency is improved by transmitting data in a different transmission order depending on the internal status such as the data preparation status handled by the data communication device CA, and the status of the line to which the destination is connected. A frame format suitable for the state is selected, and data is transmitted according to this selected frame format.

The type of frame format increases remarkably as the number of frames forming the data of one group increases. For example, when one group of data is composed of 4 frames as in the example shown in FIG. 10, since the permutation of the transmission order of 4 frames is 24 kinds of 4 factorials,
There are 24 types of frame formats, and when a group of data is composed of 5 frames, the number of frame formats is 120, which is a factorial of 5. Therefore, the data transmission completion detection method for storing the address of the next transmission completion flag shown in FIG. 12 in the next completion flag address area MF is the frame format in which there are many data to be stored in the next completion flag address area MF. It is necessary to prepare all the addresses of the transmission completion flags corresponding to the respective frames as data according to the type.

[0015]

As described above, a group of data in the case of transmitting a group of data composed of a plurality of frames in the frame transmission sequence adapted to the state of the network and the state of the local station. One of the methods for detecting the completion of transmission of the frame is whether or not this transmission completion signal is a signal due to the completion of transmission of the last frame, every time a signal indicating the completion of transmission of one frame is output from the transmission / reception unit. Is sequentially determined from the first data block of the group of data being transmitted, and another method is to determine the transmission completion flag of the frame to be transmitted next when the previous transmission completion signal is received. A method of storing the stored address and detecting the completion of transmission of a group of data depending on whether or not the stored address of the transmission completion flag is the address of the transmission completion flag of the final frame That. However, the former method determines the content of the completion flag sequentially from the beginning of the frame format each time a signal indicating that one frame has been transmitted is output, and thus the determination takes time. When the number of frames forming the format increases, there is a drawback that the amount of data to be drastically increased increases.

In view of the above circumstances, the present invention provides
It is an object of the present invention to provide a method for realizing the completion of transmission of a group of data by a short process that only refers to a small amount of data.

[0017]

In order to achieve the above-mentioned object, the invention according to claim 1 connects to a network,
A group of data consisting of an array of blocks of a plurality of data, which is passed by the control calculation means, a program storage means for storing a transmission control program, a data storage means, and the control calculation means executing the transmission control program. , A group of data in a data communication device including a transmission / reception unit that outputs to the network an array of frames corresponding to the data blocks in the same order as the array order of the data blocks is adapted to the state of the network and the state of the own station. In the data communication method of transmitting in the frame transmission order, 1
For each frame format type, which is the format of the transmission sequence of the frame sequence corresponding to the group data, and for the transmission completion flag, which is the data indicating whether or not the transmission of each frame has been completed, for each type of frame format In the data storage means, a transmission completion address table consisting of an address of an area for storing the transmission completion flag of the last frame of the frame sequence and a transmission completion addressless register are provided.
By executing the transmission control program, the control calculation means searches the transmission completion address table for the address of the transmission completion flag of the last frame of this data group before transmitting the data of the first group, and transmits the transmission completion address register. Each time the transmitter / receiver outputs a signal indicating the completion of transmission of one frame, the value of the transmission completion flag stored in the address indicated by the contents of the transmission completion address register is determined and It is characterized by detecting the completion of transmission.

Therefore, when transmitting a group of data in the data communication apparatus to which the method of the invention described in claim 1 is applied, the control operation means executes the transmission control program to select the data group to be transmitted. The transmission completion address table is searched for the storage address of the transmission completion flag indicating whether or not the transmission of the frame corresponding to the final block of the constituent data block sequence is completed, and the result is stored in the transmission completion register, and then a group is set in the transmission / reception unit. To start sending the data. Then, each time a signal indicating the completion of transmission for each frame output from the transmission / reception unit is input, the control calculation means determines the contents of the address indicated by the contents of the transmission completion register to determine 1
Detects completion of transmission of group data.

According to a second aspect of the present invention, the transmission control program is connected to the network, and the control calculation means, the program storage means for storing the transmission control program, the data storage means, and the control calculation means execute the transmission control program. A data communication device including a transmission / reception unit that outputs to the network a group of data, which has been transferred by a plurality of blocks of data, as an array in the same order as the array order of the data blocks of the frame corresponding to the data block. In the data communication method for transmitting a group of data in a frame transmission order adapted to the state of the network or the state of the local station, it indicates whether or not the transmission of each frame constituting the group of data is completed. Among the transmission completion flags that are data, the address of the area that stores the transmission completion flag of the last frame is fixed. The control calculation means determines the content of the final transmission completion flag address, which is the transmission completion flag area of the last frame, each time the transmission / reception unit outputs a signal indicating the completion of transmission of one frame, and determines the contents of the group of data. It is characterized by detecting the completion of transmission.

Therefore, in the data communication apparatus to which the method according to the second aspect of the invention is applied, the control calculation means passes the group of data to be transmitted to the transmitting / receiving section and causes the transmitting / receiving section to start transmitting this data. After that, each time a transmission completion signal for one frame is output each time transmission of one frame from the transmission / reception unit is completed, the content of the final completion flag address, which is a fixed address, is determined and Detects the completion of transmission.

In the invention according to claim 2, 1
Next address that stores the start address of the next data block in each data block, excluding the data block that is arranged at the final position having the final transmission completion flag address, among the data blocks that make up the group data It is preferable that an area is provided, the head address of the head data block of the data of the first group connected by the contents of the next address is passed to the transmitting / receiving unit, and the data of the first group is transmitted to the transmitting / receiving unit. That is,
Since the required frame format can be dynamically generated by modifying the contents of the next address area, it is not necessary to provide the same type of data block in duplicate according to the type of frame format. The transmission completion can be detected by determining the content of the fixed transmission completion flag address of.

Furthermore, in the data communication method according to claim 3, which is applied to a network for transmitting data by the token passing system, a transmission starting pointer, a state of the own station and a state of the network are stored in the data storage means. When a token for instructing the transmission of a new group of data is received from the network while transmitting a group of data, this token is provided when a frame address table that defines the optimum frame format under the condition The optimum frame format for transmitting a new group of data at the time of receiving is selected from the frame address table, and a new group of data is created according to the transmission order of the selected frame format. Stores the start address of the start data block of the group data in the transmission start pointer It is preferable that when the first token is received after the transmission of the first group of data that was being transmitted, the content of the transmission start pointer is passed to the transmission / reception unit, and the transmission / reception unit is caused to transmit the newly generated first group of data. Is.

That is, in the data communication apparatus to which the method of the present invention is applied, while one group of data is being transmitted, the other one
When a token requesting transmission of group data is received, the control calculation means executes the transmission control program until the transmission of the previous group of data is completed and the next token is received. , The optimum frame format at the time of receiving the token is selected from the frame address table, and the data block string of the requested group of data is determined by determining the contents of the next address area according to the selected optimum frame format. Then, the head address of the formed data block sequence is stored in the transmission start pointer. Then, when the next token is received, the start address of the data block sequence of the formed group of data, which is the content of the transmission start pointer, is passed to the transmission / reception unit and the requested 1
Send group data.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a data communication device CAA to which the method of the present invention is applied, which is an example of the embodiment of the present invention. The data communication device CAA comprises a control calculation means 1, a program storage means 2A, a data storage means 3A, an input device 4, a display device 5, and a transmission / reception section 6. Of the elements constituting these data communication device CAA, FIG. The components denoted by the same reference numerals as the constituent elements of the data communication device CA shown in FIG. The program storage means 2A stores a basic program P0 and a transmission control program P1A. The basic program P0 is a program having the same function as the basic program P0 of the data communication device CA shown in FIG. 8, and the transmission control program P1A completes the transmission control program P1 shown in FIG. It is a program having the same function as the transmission control program P1 except that the function to be detected is different. The program storage means 2A is a program storage means having the same function as the program storage means 2 of the data communication device CA shown in FIG. 8 except that the transmission control program P1A instead of the transmission control program P1 is stored. In the data storage means 3A, areas of a reception data area RDA, a transmission data area TDA, a transmission completion address table AT, and a transmission completion address register AR are set, and the reception data area RDA and the transmission data area TDA are shown in FIG. The area of the same purpose as the area of the same code provided in the data storage means 3 of the data communication device CA shown in FIG. 3, and the data storage means 3A has the area of the transmission completion address table AT and the transmission completion address register AR. Except for the setting, the data storage means has the same function and the same purpose as the data storage means 3.

FIG. 2 is an explanatory view of the transmission completion address table AT provided in the area of the data storage means 3A shown in FIG. FIG. 2A shows the frame formats Q11 and Q12 registered in the transmission completion address table AT. The frame format Q11 is a frame format in which four frame management units a, b, c, and d are arranged in the order of "abcd".
2 indicates that the four frame management parts a, b, c, d are "a,
It is a frame format of a format in which they are arranged in the order of c, d, and b ″. The transmission completion flag of the frame format Q11 is the transmission completion flag Fd of the transmission management unit d of the last data block in the frame format Q11. The flag Fd is stored in the transmission completion flag address EAD, and the transmission completion flag of the frame format Q12 is the transmission completion flag Fb of the transmission management unit b of the last data block in the frame format Q12.
Is stored in the transmission completion flag address EAB.

FIG. 2B shows a transmission completion table AT in which the frame formats Q11, Q12, etc. shown in FIG. 2A are registered.
It is a figure showing the contents of. As shown in the figure, the transmission completion table AT is a data group consisting of a code indicating the type of frame format and the address of the transmission completion flag of a group of data having a frame format represented by this code. The transmission completion flag address EAD of frame format Q11 is stored in the area for storing the transmission completion flag corresponding to
The transmission completion flag address EAB of the frame format Q12 is stored in the area for storing the transmission completion flag corresponding to.

FIG. 3 is an explanatory diagram for transmitting a group of data consisting of four data blocks. In the figure,
AT is the same transmission completion address table as the table with the same reference numeral shown in FIGS. 1 and 2, and AR is the same transmission completion address register as the register with the same reference numeral shown in FIG. Q1
Reference numeral 2 denotes four data blocks DB1 and DB2 each including a frame management unit a and transmission data A, a frame management unit b and transmission data B, a frame management unit c and transmission data C, a frame management unit d and transmission data D, respectively. , DB3, DB4 to "a,
It is a frame format of a group of data connected in the order of c, d, b ″. In the following description, the arrangement of the frame management units arranged in the order of the frame formats is called a frame management unit queue, and the illustrated frames are shown. Management Queue CQ
b is a management unit queue in which frame management units are arranged in the order of "a, c, d, b", and data blocks DB1, DB2, DB3, DB
4 The frame created according to each is transmitted according to the frame format of the management section queue.

The operation of transmitting a group of data having the frame format Q12 will be described with reference to the drawings.
Since the format of the group of data to be transmitted is the frame format Q12, the control operation means 1 searches the transmission completion table AT using the code "Q12" as an index, and transmits the group of data corresponding to the frame format Q12. The storage address EAB of the completion flag is obtained, and this address is stored in the transmission completion address register AR. Then the frame manager queue
The head address FDTAb of CQb is passed to the transmitting / receiving unit 6. First address FD
The transmission / reception unit 6 to which TAb is delivered reads the contents of the frame management unit a and the transmission data A sequentially from the address FDTAb, and transmits the frame FRa corresponding to the data block DB1. The frames created from the data blocks DB3, BD4, and DB2 are sequentially transmitted in the same manner. The control operation means 1 determines the contents of the address EAB indicated by the contents of the transmission completion address register AR each time the transmission / reception unit 6 inputs the transmission completion signal output every time one frame is transmitted. Since the content of this address is the transmission completion flag of the first group of data transmitted in frame format Q12, the completion of transmission is detected when the content of this address becomes 1 of the binary signal indicating the completion of transmission. To do.

FIG. 4 is an explanatory diagram of an operation of detecting the completion of transmission in the data communication apparatus CAB to which the method of the invention of claim 2 is applied, which is an example of the embodiment of the invention of claim 2. The data communication device CAB has the same configuration as that of the data communication device CAA shown in FIG. 1 except that the transmission control program P1B whose transmission completion detection method is different from the transmission control program P1A (see FIG. 1) is installed. It is a data communication device having the same function. The transmission control program P1B is executed by the control calculation means 1 (see FIG. 1), and in the initial setting, generates a frame management section queue corresponding to the type of frame format in the data storage means 3A (see FIG. 1). However, no matter what kind of frame format,
The address of the transmission completion flag of the frame management section queue of the last data block is set to a fixed address. That is, as shown in the illustrated example, the frame management unit queue CQb1 and the frame management unit queue CQb2 are configured to share the last frame management unit d having the fixed address EADF of the transmission completion flag. The control calculation means 1 detects the completion of transmission of one group of data by the value of the transmission completion flag stored in this fixed address EADF every time it receives a signal indicating the completion of transmission of one frame.

FIG. 5 shows another example of the embodiment of the invention of claim 3, which is an explanatory view of the operation of detecting the completion of transmission in the data communication apparatus CAC to which the method of the invention of claim 3 is applied. . The data communication device CAC has the same configuration as the data communication device CAA shown in FIG. 1, except that the transmission control program P1C whose transmission completion detection method is different from the transmission control program P1A (see FIG. 1) is installed. It is a data communication device having the same function. When the transmission control program P1C of the data communication device CAC is executed by the control calculation means 1 to transmit a group of data to be transmitted during transmission / reception, depending on the state of the local station or the state of the network at the time of transmission. The optimum frame format is selected from the frame address table FA shown in FIG. 6, and the final transmission completion flag address EADF, which is a fixed address for storing the final transmission completion flag, is selected so as to match the selected frame format. The frame management queue is configured such that the frame management unit d that it has becomes the last frame management unit.

FIG. 5A shows a frame management unit d having the final transmission completion flag address EADF of the frame management queue created by the transmission control program P1C in the initial setting, and frame management units a and b having arbitrary areas. , C, and transmission data areas A, B, C, D under the control of the frame management units a, b, c, d, respectively.

The control calculation means 1 is a transmission control program P1.
When C is executed, the transmission order of a group of data to be transmitted at a certain time is such that the frame management queue becomes "a, b, c, d" as shown in (b) of FIG. Frame management section a
Of the next address area of the frame management unit b is set to point to the beginning of the frame management unit b, and the contents of the next address area of the frame management unit b is set to point to the beginning of the frame management unit c. The contents of the address area are set so as to point to the beginning of the frame managing section d, and the starting address of the frame managing section a is passed to the transmitting / receiving section 6 (see FIG. 1). The transmission / reception unit 6 transmits a group of data in the same order as the frame management units a, b, c, d, and the control calculation unit 1 checks the contents of the fixed final transmission completion flag address EADF 1 Detects completion of transmission of group data.

FIG. 5C is a diagram showing a case where the transmission management unit queues in the order of the frame management units a, c, d, and b are created by the selected frame format.
In the frame management unit queue in this case, the content of the next address area of the head frame management unit a indicates the head address of the frame management unit c, and the content of the next address area of the frame management unit c is
Indicates the head address of the frame management unit b, and the frame management unit b
The content of the next address area of is pointed to the head address of the frame management unit d.

FIG. 6 is an explanatory diagram of the frame address table FA which defines the optimum frame format according to the state of the own station and the state of the network. The frame address table FA is subject to data SC indicating the status of the own station (hereinafter abbreviated as the own station condition SC) and data LC indicating the status of the network (hereinafter abbreviated as the network condition LC) under these conditions. This is a group of data that allows you to search for the optimal frame format with. In the frame address table FA, for example, when the own station condition SC is 0 and the network condition LC is 1, as shown in FIG. 6, the frame format Q11 is the optimum frame format and the own station condition SC is 0. And network conditions
When LC is 1, the frame format Q12 is said to be the optimum frame format, and the data is arranged so that the optimum frame format can be searched by the local station condition SC and the network condition LC.

FIG. 7 is an explanatory diagram of an operation of detecting the completion of transmission in the data communication device CAD to which the method of the invention of claim 4 is applied, which is an example of the embodiment of the invention of claim 4. Data communication device CAD is a transmission control program P1D
The data communication device has the same configuration and the same function as the data communication device CAA shown in FIG. The transmission control program P1D is the transmission control program P1.
When the data communication device CAD including the contents of C is connected to the network that transmits data by the token passing method, it operates as shown in Fig. 7. The operation of the data communication device CAD will be described below with reference to the drawings.

FIG. 7A shows a network consisting of three stations B1, B2 and B3, which transmit data by rotating the tokens in the order of station B1, station B2 and station B3. 8 (b) is the same as FIG.
The timing chart showing the data transmission / reception in the network shown in (a) of this figure, with the horizontal axis representing time and the vertical axis representing transmitted / received data, and the processing in station B3 using the data communication device CAD as the means of data transmission. It is the explanatory view shown.

With reference to the drawing, the processing when the station B3 receives a token requesting the transmission of a new group of data during the transmission of the group of data will be described. At time T1, station B3 is transmitting a group of data D1 consisting of frames A1, B1, C1,
If the token is received from station B2, the currently transmitting 1
From the time T2 when the transmission of the group data is completed, the data communication device CAD enters the processing described below. Data communication device CAD
Is the local condition SC at the time of reception and the network condition
Frame address table shown in FIG. 6 by LC and
The same frame address table FA as FA is searched, and the optimum frame format for transmitting the requested new group of data at the present time is selected. Next, a frame management unit queue conforming to this frame format is created, a group of data to be transmitted next is stored in the transmission data area under the management of the created frame management unit queue, and the created frame management unit queue is created. The start address of is stored in the transmission start pointer TSP. The data communication device CAD has completed the above processing until the time T3 when the next token is received, and at the time T3, immediately after receiving the next token, the contents of the transmission start pointer TSP are transferred to the transmission / reception unit 6 And sends a new group of data D2 consisting of frames A2, B2, C2.

[0038]

As described above, in the data communication device to which the method of the invention of claim 1 is applied, in which one group of data is transmitted as a plurality of frame strings, a frame string corresponding to one group of data. Of the frame sequence type, which is the format of the transmission order, and the transmission completion flag, which is the data indicating whether the transmission of each frame has been completed, of the frame format of each type, at the end of the frame sequence. A transmission completion address table composed of an address of an area for storing a transmission completion flag of a frame and a transmission completion addressless register are provided in the data storage means, and the transmission control program is executed so that the control calculation means can control the Prior to data transmission, the address of the transmission completion flag of the last frame of this data group is searched from the transmission completion address table. Stored in the signal completion address register,
Each time the transmitter / receiver outputs a signal indicating the completion of transmission of one frame, the value of the transmission completion flag stored in the address indicated by the contents of the transmission completion address register is judged to detect the completion of transmission of one group of data. To do.

That is, the control operation means of the data communication device to which the invention of claim 1 is applied, when a signal notifying the completion of transmission of one frame forming one group of data is input,
Only by determining the contents of the address indicated by the contents of the transmission completion address register, it is possible to detect whether or not the input transmission completion signal of one frame is a signal indicating the end of transmission of one group of data. Therefore, the process of determining the completion of the data transmission of the first group is simple, and the process can be performed quickly.

Further, in the data communication apparatus to which the method according to the invention of claim 2 is applied, the last of the transmission completion flags, which is data indicating whether or not the transmission of each frame constituting one group of data has been completed The address of the area for storing the transmission completion flag of the tail frame is fixed, and the control operation means is the transmission completion flag area of the last frame each time the transmission / reception unit outputs a signal indicating the transmission completion of one frame. The contents of the final transmission completion flag address are judged to detect the completion of transmission of the first group of data. That is, the control operation means of the data communication device to which the invention of claim 2 is applied, when the signal notifying the completion of the transmission of one frame forming one group of data is input, the final transmission completion flag address of the fixed address is set. Since the end of the transmission of the data of the first group can be detected only by determining the content, the process of determining the completion of the transmission of the data of the first group is simple and can be performed quickly.

Further, in the data communication apparatus to which the method of the invention of claim 2 is applied according to claim 3, the final position having the final transmission completion flag address among the data blocks forming one group of data. The next address area for storing the head address of the data block to be arranged next is provided in each data block except the data block arranged in. Then, the head address of the head data block of the data of the first group connected by the contents of the next address is passed to the transmitting / receiving unit, and the data of the first group is transmitted to the transmitting / receiving unit. Therefore, in the data communication apparatus according to the third aspect of the invention, except that the data block having the final transmission completion flag address is set as the fixed area,
It is possible to create a group of data in a required frame format by connecting data blocks created in arbitrary areas.

Further, in the data communication apparatus applied with the method of the invention of claim 3 as described in claim 4 and applied to the network for transmitting data by the token passing method, the data storage means is for starting transmission. A pointer and a frame address table that defines an optimum frame format under the conditions of the local station and the network are provided. Then, when a token instructing the transmission of a new group of data is received from the network while transmitting the group of data, it is optimal for transmitting the new group of data at the time when this token is received. From the frame address table, a new group of data is created according to the transmission order of the selected frame format, and the start address of the first data block of this group of data is used as the transmission start pointer. Upon reception of the first token after storing and transmitting the group of data that was being transmitted, the content of the transmission start pointer is passed to the transmitting / receiving unit, and the transmitting / receiving unit is made to transmit the newly created group of data. .

That is, the data communication apparatus to which the method of claim 4 is applied receives the previous group of data during transmission by the time of receiving the next token after transmitting the group of data. A new group of data requested by the token is prepared in a frame format most suitable for the state of the local station and the network when the token is received, and a new group of data is transmitted at the same time as the next token is received. The data preparation time is performed in parallel with the transmission time, and the data communication time is shortened.

[Brief description of the drawings]

FIG. 1 is a block diagram of a data communication apparatus to which the method of the present invention is applied, which is an example of an embodiment of the invention of claim 1;

FIG. 2 is an explanatory diagram of a transmission address table.

FIG. 3 is an explanatory diagram of an operation of detecting completion of transmission in the data communication apparatus shown in FIG.

FIG. 4 is an explanatory diagram of an operation in the data communication device of the example of the embodiment of the invention of claim 2;

FIG. 5 is an explanatory diagram of an operation in the data communication device of the example of the embodiment of the invention of claim 3;

FIG. 6 is an explanatory diagram of a frame address table.

FIG. 7 is an explanatory diagram of an operation in the data communication device of the example of the embodiment of the invention of claim 4;

FIG. 8 is a block diagram of a conventional data communication device.

FIG. 9 is an explanatory diagram of the case of transmitting data composed of one data block.

FIG. 10 is an explanatory diagram when transmitting a group of data including a plurality of data blocks.

FIG. 11 is an explanatory diagram of a conventional method for detecting completion of transmission of a group of data.

FIG. 12 is an explanatory diagram of another conventional method for detecting completion of transmission of a group of data.

FIG. 13 is a diagram showing an example of a frame format.

[Explanation of symbols]

 CAA data communication device 1 control calculation means 2A program storage means P1A transmission control program 3A data storage means AT transmission completion address table AR transmission completion address register a, b, c, d frame management unit Q12 frame management unit queue FDTAb frame management unit queue Start address EAB Transmission complete flag storage address

Claims (4)

[Claims] 1. A control calculation means connected to a network,
Program storage means for storing a transmission control program,
A group of data consisting of an array of blocks of a plurality of data, which is passed by the data storage unit and the control operation unit executing the transmission control program, is the same as the arrangement order of the data blocks in the frame corresponding to the data block. A data communication method for transmitting a group of data in a frame transmission order adapted to the state of the network or the state of the local station in a data communication device including a transmission / reception unit that outputs the sequence of sequences to the network. The frame of the transmission completion flag, which is data indicating whether or not each frame has been transmitted, of each type of frame format, which is the format of the transmission sequence of the frame sequence corresponding to Transmission completion address consisting of the address of the area that stores the transmission completion flag of the last frame in the column By providing a table and a transmission completion addressless register in the data storage means and executing the transmission control program, the control calculation means transmits the last frame of this data group prior to the transmission of one group of data. The address of the completion flag is retrieved from the transmission completion address table and stored in the transmission completion address register, and is stored in the address indicated by the contents of the transmission completion address register every time the transmitter / receiver outputs a signal indicating the completion of transmission of one frame. A data communication method, characterized in that the value of a transmission completion flag that is being set is determined to detect the completion of transmission of a group of data. 2. A control calculation means connected to a network,
Program storage means for storing a transmission control program,
A group of data consisting of an array of blocks of a plurality of data, which is passed by the data storage unit and the control operation unit executing the transmission control program, is the same as the arrangement order of the data blocks in the frame corresponding to the data block. A data communication method for transmitting a group of data in a frame transmission order adapted to the state of the network or the state of the local station in a data communication device including a transmission / reception unit that outputs the sequence of sequences to the network. Of the transmission completion flag, which is data indicating whether or not the transmission of each frame forming the frame is completed, the address of the area for storing the transmission completion flag of the last frame is fixed, and the control calculation means is Every time a signal indicating the completion of transmission of one frame is output, the final transmission completion flag that is the transmission completion flag area of the last frame is output. A data communication method, characterized in that the completion of transmission of a group of data is detected by determining the contents of the end flag address. 3. The data communication method according to claim 2, wherein, among the data blocks forming one group of data, the individual data blocks except the data block arranged at the final position having the final transmission completion flag address. Next, a next address area for storing the first address of the data block to be arranged next is provided, and the first address of the first data block of the group of data connected by the contents of the next address is passed to the transmitting / receiving unit, and this 1 A data communication method, wherein data of a group is transmitted to a transmission / reception unit. 4. A data communication method according to claim 3, which is applied to a network for transmitting data by a token passing method, wherein a transmission starting pointer, a state of its own station and a state of a network are stored in a data storage means. When a token for instructing the transmission of a new group of data is received from the network while transmitting a group of data, this token is provided when a frame address table that defines the optimum frame format under the condition The optimum frame format for transmitting a new group of data at the time of receiving is selected from the frame address table, and a new group of data is created according to the transmission order of the selected frame format. Store the start address of the start data block of the group data in the send start pointer and send Upon receipt of the first token after transmission completion of a group of data was to pass the contents of the transmission start pointer to the transceiver unit, the newly created transceiver 1
A data communication method comprising transmitting group data.