JPH0831866B2 - Signal transmission method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method of transmitting various media signals, and more particularly to a signal transmission method in a network in which a plurality of information devices are connected by a loop-shaped transmission path.

[Conventional technology]

Conventionally, this type of signal transmission method sequentially selects a plurality of terminal devices from a control device and sends a selection control signal to each terminal device. The selection control signal is an inquiry as to whether the corresponding terminal device is ready to receive data from the control device,
Alternatively, it is a control signal for confirming whether or not it is ready to send data from the terminal device to the control device. Upon receiving the selection control signal, the terminal device sends a response signal to the control device, and then receives the data sent from the control device.
Alternatively, the data is sent from the terminal device to the control device in synchronism with the reception of the data sending instruction command sent from the control device.

After receiving the data from the terminal device, the control device selects the next terminal device and sends a selection control signal to the corresponding terminal device.

By repeating the above-described operation, data is exchanged between the control device and the terminal device.

[Problems to be Solved by the Invention]

As described above, according to the conventional signal transmission method, the control device and each of the plurality of terminal devices interact with each other by the selection control signal sent by the control device, and sequentially transmit and receive data between the control device and the terminal device. Therefore, this signal transmission method has a large temporal redundancy, and has a disadvantage that the control device spends a lot of time until all data exchanges with a plurality of terminal devices are completed. This is especially noticeable when the number of terminal devices is large.

An object of the present invention is to provide a signal transmission method that solves the above problems.

[Means for solving the problem]

In order to achieve the above-mentioned object, a signal transmission method according to the present invention is a control device and a plurality of terminal devices connected by a loop-shaped transmission path, wherein a synchronization code for timing of data extraction and insertion and a terminal device are used. Consists of a call code that makes a communication request to the control device and a data insertion / extraction permission flag consisting of a data link flag and a communication request flag that indicates that data transmission is permitted to the terminal device or that data is transmitted to the terminal device. A control code and a block connected by the data rig flag are defined, and a data frame constituted by a data block transmitted and received between devices is transmitted on a transmission path under the control of the control device, and the data frame is transmitted. Extracting necessary information from the data frame or inserting necessary information into the data frame when each device relays A.

Further, a signal transmission method according to the present invention includes a synchronization code for timing the extraction and insertion of data and a master code in a data transmission network between a master controller and a plurality of subordinate terminals connected by a loop-shaped transmission path. A master control recognition code part for recognizing the controller, a control code for permitting data transmission to the subordinate terminal, sending data from the master controller to the subordinate terminal and consulting for reception, and from the subordinate terminal to the master controller A data frame composed of a call code for making a communication request and a data block for accommodating data exchanged between the master controller and the subordinate terminals, and the number of the data blocks is determined by the number of subordinate terminals in communication. Is transmitted on the transmission path under the control of the master controller, and when the data frame is relayed to each subordinate terminal, each subordinate terminal is transmitted from the data frame. Machine extracts the desired information and which also is intended to insert the required information to the data frame.

When there are a plurality of master controllers, the mask controller in which the data frame having the above-mentioned configuration is inserted in the transmission path is treated as a master controller, and the other master controllers serve as subordinate terminals while relaying the data frame. It handles the data frames sequentially from each master controller, and controls the data transmission alternately.

〔Example〕

 Next, the present invention will be described with reference to the drawings.

(Embodiment 1) FIG. 1 is a configuration diagram showing a data frame in Embodiment 1 of the present invention, FIG. 2 is a diagram showing main symbols constituting the data frame, and FIG. 3 uses a signal transmission method of the present invention. FIG. 4 is a diagram for explaining a signal transmission network, and FIG. 4 is a diagram for explaining a procedure for exchanging data between the control device and the #k terminal device using the signal transmission method of the present invention in the network of FIG.

In a signal transmission network in which a control device 21 and a plurality of terminal devices 22a to 22f shown in FIG. 3 are connected by a loop-shaped transmission line 23, a synchronization code 1 and a call code 2 as shown in FIG.
, The control code 3, and the data blocks 4a and 4b corresponding to the terminal devices 22a to 22f in which a data link is formed with the control device 21.
A data frame composed of ... Is transmitted from the control device 21. In the data frame, the synchronization code 1 measures the timing of data extraction and data insertion. The call code 2 is, as shown in FIG.
Each terminal device 22 including a flag F _{1 for} requesting a communication from 2f to the control device 21 and a response flag F ₂ for the corresponding terminal device 22a to 22f in response to a communication request from the control device 21 to the terminal devices 22a to 22f.
It is composed of communication request flags 11a to 11d in units of a to 22f.
The number of communication request flags 11a to 11d is determined based on the number of terminal devices 22a to 22f connected to the network.

The control code 3 is, as shown in FIG. 2, each terminal device 22a to 22f.
The unit data insertion / extraction permission flags 12a to 12d and the error control code 13 for performing error control of the control code 3 on the transmission path.
Composed of and. Data insertion extraction permission flags 12a to 12d
As shown in FIG. 2, the control device 21 is the corresponding terminal device 22a-2.
A communication request flag F ₃ for the corresponding terminal equipment 22a~22f to send data 18 to 2f, data can be linked by one based on the communication request from the communication request or the control device 21 from the terminal device 22a~22f It is composed of a data link flag F ₄ which is set by the control device 21 when it becomes low. The number of data insertion / extraction permission flags 12a to 12d is determined by the number of terminal devices 22a to 22f connected to the transmission path, and is transmitted from the control device 21 by the number of data link flags "1" set by the control device 21. It also determines the number of data blocks 4a, 4b in the data frame sent to the road. The data blocks 4a and 4b are connected in the order of terminal numbers in units of data-linked terminal devices 22a to 22f.

The structure of the data blocks 4a and 4b is as shown in FIG.
Address code indicating the terminal number of the corresponding terminal equipment 22a to 22f
15, a direction code 16, a media code 17, data 18 exchanged between the control device 21 and the terminal devices 22a to 22f, and an error control code 19 for performing error control of the data block 4.
And, the result of error control when receiving the transmitted data blocks 4a, 4b is mounted on the data blocks 4a, 4b when transmitting the data frame to the destination of the data blocks 4a, 4b and notified. Error control response code 20 for The direction code 16 indicates that the data blocks 4a and 4b on the data frame are transmitted from the control device 21 to the terminal devices 22a to 22f.
To the control device 21 from the terminal devices 22a to 22f. The media code 17 is a code in which the data 18 mounted on the data blocks 4a and 4b represents any one of voice, data code image, graphic and the like.

The operation of exchanging data between the control device 21 and the arbitrary #k terminal device 22d in the network of FIG. 3 by the above-described data frame will be described with reference to the signal transmission method of FIG.

In FIG. 4, when transmitting the No. 1st data frame from the control device 21, the control device 21 and the #k terminal device 22d
It is assumed that the data link is not formed during the period, but the terminal device 22d of #k is ready for the data to be sent to the control device 21, is in the data ready state, and is in the call state. The terminal device 22d of #k synchronizes the data with the synchronization code 1, and while receiving the data frame, on the other hand, relays the received data frame,
The data frame is sent to the control device 21 via the next terminal device or the like. The terminal device 22d of #k sets a flag of "10" at the position of the call code of #k of the No. 1 data frame to be transmitted upon receiving the call in the device, and transmits again. That is, the communication request is sent from the terminal device 22d of #k to the control device 21. The control device 21 receives the No. 1 data frame, and confirms the call by confirming that the communication request flag is "1" among the communication request flags of #k of the call code. By this confirmation, the terminal device 22d of #k and the control device 21
This means that the data link has been formed. When the next No. 2 data frame is transmitted from the control device 21, the communication request flag 11 of #k of the call code is set to "10", and the data insertion / extraction permission flags 12a to 12d and #k are set. The data blocks 4b of 4 are connected, and the control device 21 newly sends the No. 2 data frame to the transmission path. The data insertion / extraction permission flags 12a to 12d set the flag of the data link to be configured to "1" and
Since the control device 21 has already prepared the data to be sent to the terminal device 22d of #k when the data frame of #k is transmitted, the flag of the communication request for making a communication request to the terminal device 22d of #k is set to "1. , And send it.

When the terminal device 22d of #k receives the No. 2 data frame, the communication request flags 11a to 11d of #k from the control code 3 are received.
Detects a data link "1" and a communication request "1" from the data link, a data link is formed, data can be transmitted from the #k terminal device 22d, and the data block 4b for the #k terminal device is a data frame. Is confirmed to be connected to the control device 21 and based on the communication request "1"
It recognizes that it has received an inquiry to the terminal device 22d of whether or not to send data. Since the terminal device 22d of #k is in the state of being ready to receive data, the control device is passed via the next terminal device.
When transmitting the No. 2 data frame transmitted to 21, the data reception ready of the call code 2 is set to "1".
Further, since the #k terminal device 22d forms a data link with the control device 21, the #k terminal device 22d to the control device 21 in the data block 4b for the #k terminal device 22d.
Set the data to. The data in the data block is
The address code 15 of the terminal device 22d of #k, the direction code 16 representing the data transmission from the terminal device 22d to the control device 21, the media code 17, the data 18 "10 ... 10", and the error control code 19
Is.

When the control device 21 receives the No. 2 data frame, from the #k data insertion / extraction permission flag 12c of the control code 3,
It recognizes that there is a data block 4b for the terminal device 22d of k, and recognizes that the terminal device 22d of #k is ready to accept data from the control device 21 by the communication request flag 11c of the call code 2. To do.

The control device 21 performs error control for each data block received in the No. 2 data frame, and sends the result to the terminal device as the error control response code 20 in the corresponding data block of the No. 3 data frame to be transmitted next. return.

Based on the result of receiving the No. 3 data frame, the control device 21 uses the communication request flag 11c for the #k terminal device 22d of the call code 2 to continue the data transmission request from the #k terminal device 22d, and control Make sure you are ready to accept data 18 from device 21. Therefore, the control device 21 sets the data link “1” and the communication request “1” of the data insertion extraction permission flag 12c for the terminal device 22d of #k in the control code 3 of the No. 3 data frame, and The data block 4b for the terminal device 22d is connected.

In the data block 4b, the address code 15, the direction code 16, the media code 17, the data 18, and the error control code 19 for the #k terminal device 22d are set, and the #k terminal device when receiving the # 2 data frame described above. Data block 4b for 22d
The error control result of is set as error control response code 20 and N
It is sent to the terminal device as a data frame of o.4.

When the No. 3 data frame is received by the #k terminal device 22d, the data 18 and the like are extracted and taken into the terminal device, and the same processing as that for the No. 2 data frame is performed. When the No. 3 data frame is transmitted from the #k terminal device 22d to the control device 21, the data 18 etc. in the data block 4b for the #k terminal device 22d is
The data 18 or the like sent from the terminal device to the control device 21 is replaced. Incidentally, when the data link between the control device 21 and the terminal device is switched from the communication request flag “1” sent from each other to “0”, the data link is cut off in the cycle of the next data frame.

The present signal transmission method can freely connect or disconnect data blocks in one data frame,
It has a feature that data can be exchanged with a corresponding terminal device and that data can be received in the same data block and vice versa. In addition, all the terminal devices 22a to 2a connected by the loop transmission line on one data frame.
It has the feature of being able to interact with 2f at the same time.

Therefore, according to the present invention, a transmission control procedure code such as a communication request from a plurality of terminal devices or a data transmission from the control device to each terminal device is performed on the data frame sent from the control device to the transmission path. Conversely, data can be sent from the terminal device to the control device. By periodically sending this data frame to the transmission line, it is possible to efficiently and smoothly exchange data between the control device and the terminal device or between the terminal device via the control device. Therefore, this method has an effect that data can be transmitted and received in a shorter time than the conventional method.

That is, this method freely adjusts the size of the data frame by inserting the data block for the corresponding terminal device into the data frame according to the data link based on the communication request from the terminal device or the data transmission request from the control device, and the inserted data Data can be loaded in blocks.

Therefore, the present signal transmission method is an extremely efficient data transmission / reception method, and is a method capable of performing efficient and high-speed data transmission particularly in a network to which a large number of terminal devices are connected.

(Embodiment 2) FIG. 5 is a configuration diagram showing a data frame in Embodiment 2 of the present invention, FIG. 6 is a data transmission network diagram for performing data transmission using the data frame of the present embodiment, and FIG. FIG. 8 is an explanatory view of main symbols constituting a frame, FIG. 8 is a transmission diagram of a data frame inserted in a transmission path when it is composed of a plurality of master controllers, and FIG. 9 is a data frame of the second embodiment of the present invention. It is explanatory drawing of the data transmission method using.

The master controller 101 is a device that cyclically inserts the data frame of FIG. 5 transmitted on the loop-shaped transmission line 105 on the transmission line 105 and controls data transmission with the subordinate terminal 102. Data transmission in the data transmission network is performed via the data frame, and the master controller
Data transmission / reception between points of 1: n is performed between the 101 and the subordinate terminal 102. When there are a plurality of master controllers 101, the device that inserts the data frame into the transmission path 105 by itself is the master controller 101, and the other master controllers 101 are treated as subordinate terminals 102 while relaying the data frames. Relays data frames and exchanges data.

The subordinate terminal 102 receives the control code 54 from the data frame transmitted under the control of the master controller 101, and the call code 55
Reply by the master controller from the corresponding data block
Extract data from 101 or insert data into master controller 101. In addition, the subordinate terminal 102 is the next subordinate terminal 1
02 or relays and sends the data frame to the master controller 101.

The data frame has the structure shown in FIGS. 5 and 7.
It is transmitted on the data transmission network under the control of the master controller 101. The main symbols are as follows. 52 is a synchronization code. The master control identification code 53 is the master controller 10
This is a code for recognizing under which control the corresponding data frame is inserted in the transmission path when 1 is plural. Control code 54 is a master controller
This control signal is sent from 101 to each subordinate terminal 102, has as many slots as the subordinate terminals 102, and comprises data insertion / extraction permission flags 41, 41 ... And an error control signal 42.
The data insertion / extraction permission flag 41 includes a data link flag 31 for each subordinate terminal 102 and a communication request flag 32 for transmitting data from the master controller 101 to the subordinate terminal 102. The call code 55 has as many slots as the number of subordinate terminals 102, and is composed of communication request codes 45, 45 .... The communication request code 45 is composed of a communication request flag 33 for transmitting data to the master controller 101 and a data reception ready 34 which is a response to the communication request flag 32 from the master controller 101 to the subordinate terminal 102. .

The data block 56 is a master controller 101 and a slave terminal 102.
The master controller 101 is provided in the data frame corresponding to the subordinate terminal 102 that is communicating only during the communication. The data block 56 is the address code 46 for recognizing the subordinate terminal 102, and the data 49 of the data block 56 on the transmission path is the data 49 sent from the master controller 101, or vice versa. Direction code 47 for distinguishing whether it is data 49 to 101, media code 48 indicating what the medium of data 49 is, error control code 60 for performing error control of data 49 and each data block 56.
And an error control response 61 for notifying the partner device in communication of the error control result at the time of receiving the data block when transmitting the data block.

A data frame is composed of the main codes as described above and circulates on the data transmission network.

The operation of data transmission in the present invention will be described with reference to FIG. In the present invention, the master controller 101 in the data transmission network is one set.

When there is data to be transmitted from the master controller 101A to the #k subordinate terminal 102, the master controller 101A sets the #k data insertion / extraction permission flag 41 when transmitting the No. 1 data frame to the transmission path 105. The communication request flag 32 is set to "1". When the #k subordinate terminal 102 receives the No. 1 data frame, it confirms that the communication request flag 32 is “1” from the #k data insertion / extraction permission flag 41. If the #k slave terminal 102 is ready to receive the data 49 from the master controller 101A, the #k communication request code is used when relaying and transmitting the corresponding No. 1 data frame.
The data signal ready 34 of 45 is set to "1".

The master controller 101A receives the No. 1 data frame transmitted by relaying each subordinate terminal 102, and checks each code and extracts the data. #K subordinate terminal
Data reception ready 34 of #k communication request signal 45 from 102
Is detected as “1”, the subordinate terminal 10 of #k
Set the data link with 2.

Following the No. 1 data frame, the No. 2 data frame is sent to the transmission path 105. At this time, master controller 1
01A sets the data link flag 31 of the #k data insertion / extraction permission flag 41 to "1" and connects the #k data block 56 corresponding to the #k slave terminal 102 to the No. 2 data frame. Then insert the data.

When the #k slave terminal 102 receives the No. 2 data frame, it knows the existence of the #k data block 56 from the data link flag 31 of the #k data insertion / extraction permission flag 41, and the #k data block 56. The address code 46 of No. is checked and the data 49 of #k is extracted. Also, an error control check is performed on the #k data block 56.

When the #k subordinate terminal 102 relays and sends the No. 2 data frame, since there is send data to the master controller 101A, the #k communication request code of the No. 2 data frame.
The communication request flag 33 of 45 is set to "1". And
The error control check result for the received #k data block 56 is again used as the error control response for the #k data block 56.
Set to 61.

When the master controller 101A receives the No. 2 data frame, the master controller 101A performs the same check as the previous time, and the #k slave terminal 10
The communication request flag 33 from 2 and the error control response 61 from the #k data block 56 are confirmed.

Next, when transmitting the No. 3 data frame to the transmission line 105, the master controller 101A sets the data link flag 31 of the #k data insertion / extraction permission flag 41 in accordance with the confirmation of the communication request flag 33, and Insert k data blocks 56.

The #k slave terminal 102 receives the No. 3 data frame as before, and when relaying and transmitting the No. 3 data frame, the #k data block 56 of the No. 3 data frame receives the #k slave terminal. Set the data to be sent from 102 to master controller 101A.

The master controller 101A extracts the data from the #k slave terminal 102 in the #k data block 56 of the No. 3 data frame.

As described above, the data frame is cyclically transmitted from the master controller 101A to the transmission path 105, so that data can be exchanged with the subordinate terminal 102 connected thereto.

Further, even when there are a plurality of master controllers 101, as shown in FIG. 4, the master controllers 101A and 101B alternately send data frames to the transmission path 105 and send the data frames. By treating the master controller 101A as the master controller 101A and the other master controllers 101B as the subordinate terminals 102, data can be efficiently exchanged in the same manner as in the case where the master controller 101 is one set. .

According to the present data transmission method, the data blocks 56 forming the data frame can be freely connected or disconnected by the data link flag 31, and the same data block 56 is used on the same data frame, and the master controller 101 From the slave terminal 102 to the slave terminal 102 and from the slave terminal 102 to the master controller 101 at the same time.

Therefore, according to the present invention, a control code, a call code and a data block for a plurality of subordinate terminals are placed on one data frame sent from the master controller to the transmission line,
Since this can be circulated in a loop-shaped transmission path, data transmission between the master controller and the slave terminal can be performed quickly and efficiently. Further, since the data transmission can be performed by an extremely simple method, there is an effect that the control procedure becomes simple.

Further, when there are a plurality of master controllers, the master controllers are sequentially switched, other master controllers are treated as subordinate terminals, and by setting them, efficient data transmission can be performed.

[Effects of the Invention] As described above, according to the present invention, there is an effect that efficient and high-speed data transmission can be performed in a network to which a large number of terminal devices are connected.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a data frame in Embodiment 1 of the present invention, FIG. 2 is an explanatory diagram of main symbols constituting the data frame, FIG. 3 is a signal transmission network diagram, and FIG. FIG. 5 is an explanatory diagram of a signal transmission method using a data frame of the embodiment, FIG. 5 is a configuration diagram showing a data frame in the embodiment 2 of the present invention, FIG. 6 is a data transmission network diagram, and FIG. 7 is a data frame configuration. FIG. 8 is a diagram of transmission of data frames inserted in a transmission path in the case of a plurality of master controllers, and FIG. 9 is a data transmission method using data frames according to the second embodiment of the present invention. FIG. 1,50 …… Synchronization code, 2,55 …… Call code 3,54 …… Control code, 4a, 4b, 56 …… Data block 11a to 11d, 32,33 …… Communication request flag 12a to 12d, 41… … Data insertion / extraction permission flag 13,19,60 …… Error control code, 15,46 …… Address code 16,47 …… Direction code, 17,48 …… Media code 18,49 …… Data, 20 …… Error Control response code 21 …… Control device, 22a to 22f …… Terminal device 23,105 …… Transmission path, 31 …… Data link flag 34 …… Data reception ready, 45 …… Communication request code 53 …… Master control recognition code, 57 …… End code 61 …… Error control response, 101 …… Master controller 102 …… Subordinate terminal

Claims (3)

[Claims] 1. A control device connected to a loop-shaped transmission path and a plurality of terminal devices, a synchronization code for timing of data extraction and insertion, and a call code for making a communication request from the terminal device to the control device. A control code composed of a data insertion / extraction permission flag consisting of a data link flag and a communication request flag, which indicates that data transmission is permitted to the terminal device or data is transmitted to the terminal device, and is linked by the data link flag. Data blocks that are defined by the control device and the data blocks that are transmitted and received between the devices are transmitted on the transmission path under the control of the control device, and the data frames are relayed by the devices. A signal transmission method, characterized in that necessary information is extracted from or is inserted into a data frame. 2. In a data transmission network between a master controller and a plurality of subordinate terminals connected by a loop-shaped transmission path, a synchronization code for timing of data extraction and insertion and a master controller are recognized. Master control recognition code part, control code for permitting data transmission to the subordinate terminal, sending data from the master controller to the subordinate terminal and consulting for reception, and a call for requesting communication from the subordinate terminal to the master controller A data frame composed of a code and a data block containing data transmitted and received between the master controller and the subordinate terminals, the number of the data blocks being determined by the number of subordinate terminals in communication, The information required by each dependent terminal from the data frame when the data frame is relayed to each dependent terminal under the control of Extracted, and the signal transmission method characterized by inserting the necessary information to the data frame. 3. When there are a plurality of master controllers, the mask controller in which the data frame of the above configuration is inserted in the transmission path is treated as a master controller, and the other master controllers are subordinate while relaying the data frames. Treat as a terminal, insert data frames from each master controller into the transmission line,
The signal transmission method according to claim (2), characterized in that the data transmission is alternately controlled.