JPH0681153U - Data communication processor - Google Patents

Abstract

(57) [Summary] [Configuration] A node circulates a frame having a normal data field for storing low-priority normal data and a voice data field for storing high-priority voice data on the network, The frames of each station are transmitted and received in a time division manner. At the time of transmitting the voice data, the protocol handler 24 and the voice data transmission buffer 25 acquire the transmission right for the received frame of the own station. On the other hand, when transmitting normal data, the protocol handler 24 and the normal data transmission buffer 27 acquire the transmission right for the received frame of each station. [Effect] Since the voice data and the normal data are transmitted in different forms, the communication time of the normal data is not delayed by the transmission of the voice data. Also, the voice data can be immediately transmitted.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a data communication processing device that circulates a frame on a network and transmits and receives the frame of each station in a time division manner.

[0002]

[Prior art]

 In order to make effective use of resources such as information data and programs, information processing equipment uses a ring-type LAN (local area network) that connects multiple data communication processing equipment in a ring shape with communication lines to allow multiple devices to communicate with each other. Often connected to be accessible.

A data communication processing device used in a ring LAN normally controls network access by a token passing method, and a token (network access right) is set between the data communication processing devices. Data is transferred in sequence, and data communication is performed in frame units when the access right is acquired. As a result, the conventional data communication processing device can prevent contention of information data on the transmission line of the ring LAN.

[0004]

[Problems to be solved by the device]

 However, in the above-mentioned conventional data communication processing device, all the information data are not transmitted until the access right is acquired, and therefore, it is not possible to immediately respond when the specific information data is urgently transmitted. Therefore, in Japanese Unexamined Patent Publication No. 2-39752, a data area indicating a priority corresponding to the urgency of information data is added to a frame, and urgent information data is preferentially transferred based on this priority. A data communication processing device is disclosed.

However, in this case, communication of information data of low priority (hereinafter referred to as low priority information data) of high priority (hereinafter referred to as high priority information data) is terminated. It will not be transferred until. Therefore, for example, when high priority information data that is continuously generated such as voice is transmitted from each data communication processing device, low priority information data is received by the destination station and taken in after the transmission request is generated. The delay time until it becomes indefinite due to the transmission frequency of the high priority information data. As a result, each data communication processing device cannot guarantee the maximum value of the delay time of the information data, so that there is a problem that it is not possible to confirm the occurrence of an abnormality by the delay time.

Therefore, the present invention provides a data communication processing device capable of immediately transferring high priority information data without making the delay time of low priority information data indefinite by the high priority information data. The purpose is to do.

[0007]

[Means for Solving the Problems]

 In order to solve the above problems, the data communication processing device of the present invention has a low priority information data area for storing low priority information data of low priority and a high priority information data area for storing high priority information data of high priority. A frame having a priority information data area is circulated on the network, and the frames of each station are transmitted and received in a time division manner. Then, the transmission right is acquired when the frame of the own station is received, and the first transmission means that stores the low priority information data in the low priority information data area of this frame, and the transmission right is acquired when the frame of each station is received. However, it is characterized by having a second transmitting means for storing the high priority information data in the high priority information data area of this frame.

[0008]

[Action]

 According to the above configuration, when the high priority information data is transmitted, the transmission right is acquired for the frame of each received station, so that the high priority information data can be immediately transferred. There is. Further, the low priority information data and the high priority information data are stored in different data areas of the frame, and the low priority information data is stored only in the low priority information data area of the own frame. As it is sent, the communication time of low priority information data is not delayed by the transmission of high priority information data. Therefore, since the data communication processing device can set the maximum value of the delay time of the low priority information data, it is possible to confirm whether or not there is an abnormality in the network.

[0009]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

The node, which is the data communication processing device according to the present embodiment, is configured to perform network access control by a time division multiplexing method in the ring LAN. As shown in FIG. 3, for example, a ring-type LAN is configured by connecting a plurality of nodes 1, 2, 3, and 4 in a ring shape via a communication line 5, and on a network composed of the communication lines 5. The frames 6, 7, 8, and 9 of the nodes 1, 2, 3, and 4 exist in each station.

The above frames 6, 7, 8 and 9 have the same data structure, and as shown in FIG. 2, a flag sequence field 11, a destination address field 12, an own node address field 13 and a frame. Lifetime field 14, data length field 15, normal data field 16 for storing normal data which is low priority information data, normal data frame check sequence field 17, voice data busy field 18, voice data source node address field 19, a voice data field 20 for storing voice data which is high priority information data, and a voice data frame check sequence field 21.

The above-mentioned destination address field 12 is an area for storing destination address data unique to the nodes 1, 2, 3 and 4 which are receiving stations of the normal data stored in the normal data field 16, and the own node address. The field 13 is an area for storing the own station address data of the nodes 1, 2, 3, and 4 that transmitted the frames 6, 7, 8, and 9. The destination address field 12 and the own node address field 13 can also store specific address data designating all the nodes 1, 2, 3 and 4.

The frame life field 14 is used for other nodes 1 and 2 when the node bypass function is activated due to the abnormality of the nodes 1, 2, 3 and 4 and the monitoring of the frames 6, 7, 8 and 9 cannot be performed. • This is an area that stores the frame life data used to erase frames 6, 7, 8, and 9 according to 3.4. That is, the frame life field 14 stores the frame life data when each node 1, 2, 3, 4 stores normal data or voice data in the frames 6, 7, 8, 9 and transmits the data on the network. The frame life data is stored every time a frame 6, 7, 8 or 9 passes through another node 1, 2, 3 or 4 on the receiving side. It is adapted to be compared with the set values of 3.4. Then, when the comparison result that the frame life data is larger than the set value is obtained, after the frame life data is subtracted, the frames 6, 7, 8 and 9 are transmitted to the next node 1・ It will be sent to 2 ・ 3 ・ 4. On the other hand, when the comparison result that the frame life data is smaller than the set value is obtained, it is determined that an abnormality has occurred in the nodes 1, 2, 3, 4, etc. Transmission of 6/7/8/9 is stopped.

The data length field 15 is an area for storing data indicating the data length of normal data that is low priority information data and voice data that is high priority information data. The normal data of the data length field 15 is The length and voice data length can be changed arbitrarily. As a result, when the frequency of data transmission of normal data is high, the normal data length can be set to a large value and the voice data length can be set to a small value to enable efficient transmission. On the other hand, when the frequency of data transmission of normal data is low, the normal data length is set to a small value and the voice data length is set to a large value to enable efficient transmission.

The normal data frame check sequence field 17 is an area for storing data for confirming whether or not there is an abnormality in the data content of the area corresponding to the normal data frame. The audio data in-use field 18 is an area for storing an in-use flag indicating whether or not audio data is stored in the audio data field 20. The voice data transmission node address field 19 is an area for storing the address data of the nodes 1, 2, 3 and 4 which are receiving stations of the data stored in the voice data field 20. The audio data frame check sequence field 21 is an area for storing data for checking whether or not there is an abnormality in the data content of the area corresponding to the audio data frame.

The nodes 1, 2, 3, and 4, which transmit and receive the frames 6, 7, 8, and 9 described above, have a repeater 22 for directly accessing the frames 6, 7, 8, and 9, and the relay 22. It has a host device 30 connected to the container 22. The host device 30 is connected to an information processing device such as a terminal or a host computer (not shown), and is configured to process information such as normal data and voice data transmitted and received between the information processing devices.

As shown in FIG. 1, the repeater 22 has a ring medium I / F receiving section 23 connected to the communication line 5. The ring medium I / F receiving unit 23 converts the signal form of the frames 6, 7, 8 and 9 received via the communication line 5 into a signal form suitable for the processing in the repeater 22. The ring medium I / F receiving section 23 is connected to a protocol handler 24 (first transmitting means / second transmitting means) that controls communication by using the data in the frames 6, 7, 8, and 9 described above. The frames 6, 7, 8 and 9 are output to this protocol handler 24. Then, the protocol handler 24 is connected to the ring medium I / F transmitting unit 31, and the ring medium I / F transmitting unit 31 receives the frames 6, 7, 8 and 9 from the protocol handler 24. The signal form is converted into a signal form suitable for the communication line 5 and output.

Further, the protocol handler 24 is connected with a higher-order I / F unit 29 connected to the higher-order device 30 of FIG. 3, and the protocol handler 24 and the higher-order I / F unit 29 receive various control signals. It is designed to send and receive. Further, the protocol handler 24 and the upper I / F unit 29 are composed of a voice data transmission buffer 25 (second transmission means), a voice data reception buffer 26, a normal data transmission buffer 27 (first transmission means), and a normal data reception buffer. The voice data transmission buffer 25 and the normal data transmission buffer 27 are connected via a buffer 28, and temporarily store the voice data and the normal data output from the upper I / F unit 29, respectively, and use the protocol handset. It is designed to be output to the drive 24. On the other hand, the voice data reception buffer 26 and the normal data reception buffer 28 temporarily store the voice data and the normal data output from the protocol handler 24 and output them to the upper I / F unit 29. ing.

The operation of the nodes 1, 2, 3, and 4 in the above configuration will be described.

First, as shown in FIG. 3, when the nodes 1, 2, 3 and 4 are connected in a ring topology form via a communication line 5 and a ring LAN is formed, the nodes 1 and 2 are connected. -The 3 and 4 protocol handlers 24 monitor whether their own frames 6, 7, 8 and 9 are circulating on the network. Then, these nodes 1, 2, 3, 4 generate their own frames 6.7.8.9 on the network if their frames 6.7.8.9 do not exist. It operates so that only one station frame 6, 7, 8, 9 exists on the network.

When the frames 6, 7, 8 and 9 of the respective stations circulate on the network in a time division manner by the above operation of the frames 6, 7, 8 and 9, the nodes 1, 2, 3 and 4 are , It becomes possible to communicate normal data and voice data. Then, when the nodes 1, 2, 3, and 4 transmit normal data, as shown in FIG. 1, the normal data is written from the host device 30 to the normal data transmission buffer 27 via the host I / F unit 29. At the same time, the fact that normal data is to be transmitted and the destination address data attached to the destination nodes 1, 2, 3, and 4 are notified to the protocol handler 24 as control signals.

The protocol handler 24 that has received the above control signal reads out its own station address data stored in its own node address field 13 when receiving frames 6, 7, 8 and 9 circulating on the network. Based on this own station address data, it is determined whether or not the received frames 6, 7, 8, and 9 correspond to the nodes 1, 2, 3, and 4 of the own station. If the result of determination is that it corresponds to the node 1, 2, 3, or 4 of the own station, the normal data in the normal data transmission buffer 27 is the normal data field of the frame 6, 7, 8, or 9. After being stored in 16, the frames 6, 7, 8 and 9 are transmitted to the network via the ring medium I / F transmitting unit 31.

On the other hand, when it is not possible to obtain the determination result that it corresponds to the nodes 1, 2, 3, and 4 of the own station, the data of the fields related to the normal data in the frames 6, 7, 8, and 9 are fetched. Then, the received data of the normal data frame check sequence field 17 is compared with the frame check sequence data created by the nodes 1, 2, 3, and 4 themselves at the time of reception. If the two data are the same, it is determined that the data has been normally received, and the fetched data is stored in the normal data reception buffer 28. After that, the data of the frame life field 14 and the normal data frame check sequence field 17 are updated, and the frames 6, 7, 8, and 9 are transmitted to the network via the ring medium I / F transmission unit 31. .

Further, when the judgment result based on the data of the normal data frame check sequence field 17 and the frame life field 14 indicates that the received frames 6, 7, 8 and 9 are abnormal, Will be discarded at the nodes 1, 2, 3, and 4 that have received this frame 6.7.8.9. As a result, the discarded frames 6, 7, 8 and 9 will disappear from the network, but the corresponding nodes 1, 2, 3, and 4 that detected the loss of frames 6, 7, 8, and 9 4 will be retransmitted on the network.

At this time, the data in the fields related to the audio data, which will be described later, is transmitted in the initialized state. This means the disappearance of voice data, but since voice data delayed due to transmission failure has no significant meaning in voice reproduction work, it is the highest priority to receive newly transmitted voice data. To let it happen.

Next, when the nodes 1, 2, 3, and 4 transmit audio data, the audio data is written from the host device 30 to the audio data transmission buffer 25 via the host I / F unit 29. At the same time, the fact that the voice data is transmitted and the destination address data attached to the destination nodes 1, 2, 3, and 4 are notified to the protocol handler 24 as control signals.

When the protocol handler 24 receiving the above control signal receives the frames 6, 7, 8 and 9 circulating on the network, the busy flag of the voice data busy field 18 is “1”. By determining whether or not there is voice data, it is determined whether or not voice data is stored in the voice data field 20 of the received frame 6, 7, 8, or 9. Then, when the result of the determination is that the frames 6, 7, 8, and 9 in which the voice data is not stored are received, the busy flag of the voice data busy field 18 is set to "1". At the same time, the own station address data and voice data are stored in the voice data transmission node address field 19 and the voice data field 20, respectively, and after the data in the voice data frame check sequence field 21 are updated, the frames 6 and 7 are updated.・ 8 ・ 9 will be transmitted on the network.

On the other hand, when it is determined that the frames 6, 7, 8, and 9 in which the voice data is stored are received, the own station stored in the voice data source node address field 19 Whether or not the address data belongs to the own station will be determined. If the result of the judgment is that the own station address data does not indicate the node 1, 2, 3, or 4 of the own station, it is confirmed that the data of the voice data frame check sequence field 21 is correct. After that, the audio data in the audio data field 20 is copied to the audio data reception buffer 26.

Further, when the determination result that the own station address data indicates the node 1, 2, 3, 4, of the own station is obtained, the voice data is stored in the voice data transmission buffer 25. If so, this audio data is stored in the audio data field 20, the data in the audio data frame check sequence field 21 is updated, and then transmitted over the network. On the other hand, when no voice data is stored in the voice data transmission buffer 25, the busy flag in the voice data busy field 18 is cleared to "0" and then transmitted on the network.

As described above, in the nodes 1, 2, 3, and 4 of this embodiment, the normal data field 16 for storing normal data that is low priority information data with low priority and the high priority with high priority are stored. A frame 6/7/8/9 having a voice data field 20 for storing voice data which is information data is circulated on the network so that the frames 6/7/8/9 of each station are transmitted and received in a time division manner. It has become. Then, at the time of transmitting the voice data, the protocol handler 24 and the voice data transmitting buffer 25, which are the second transmitting means, acquire the transmission right for the received frames 6, 7, 8, and 9 of the own station, and the normal data field. The normal data is stored in 16. Further, at the time of transmitting normal data, the protocol handler 24 and the normal data transmission buffer 27, which are the first transmitting means, acquire the transmission right with respect to the received frames 6, 7, 8 and 9 of each station, and the voice data field 20 The voice data is stored in the.

As a result, when the voice data is transmitted, the transmission right is acquired for the frames 6, 7, 8, and 9 of each station, so that the voice data can be immediately transferred. Further, the normal data and the voice data are stored in the different data fields 16 and 20 of the frames 6, 7, 8 and 9, respectively, and the normal data is the normal data of the frame 6, 7, 8 and 9 of the own station. Since it is stored only in the field 16 and transmitted, the communication time of normal data is not delayed by the transmission of voice data, and the maximum value of the delay time of normal data can be set. It has become. Therefore, the nodes 1, 2, 3, and 4 can confirm whether or not an abnormality has occurred in the network.

[0032]

[Effect of device]

 As described above, the data communication processing device of the present invention has the low-priority information data area for storing low-priority low-priority information data and the high-priority information data area for storing high-priority high-priority information data. A frame having a frequency information data area is circulated on the network, and the frames of each station are transmitted and received in a time-division manner. First transmitting means for storing low priority information data in the information data area, and a transmission right is acquired when a frame of each station is received, and high priority information data is stored in the high priority information data area of this frame. And a second transmitting means for performing the operation.

With this, at the time of transmitting the high priority information data, the transmission right is acquired for the received frame of each station, so that the high priority information data can be immediately transferred.

Further, the low priority information data and the high priority information data are stored in different data areas of the frame, and the low priority information data are stored only in the low priority information data area of the frame of the own station. Therefore, the communication time of the low priority information data is not delayed by the transmission of the high priority information data. Therefore, since the maximum value of the delay time of the low priority information data can be set, it is possible to confirm whether or not an abnormality has occurred in the network.

[Brief description of drawings]

FIG. 1 is a block diagram of a repeater of a data communication processing device of the present invention.

FIG. 2 is an explanatory diagram showing a data field of a frame.

FIG. 3 is an explanatory diagram of a network in which data communication processing devices are connected in a ring shape.

[Explanation of symbols]

1, 2, 3, 4 node (data communication processing device) 5 communication line 6, 7, 8, 9 frame 16 normal data field 20 voice data field 22 repeater 24 protocol handler (first transmitting means / second transmitting means) 25 Audio data transmission buffer (second
Transmission means) 27 Normal data transmission buffer (first
Transmission means) 30 Host device

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Claims (1)

[Scope of utility model registration request] 1. A network comprising frames having a low priority information data area for storing low priority information data of low priority and a high priority information data area for storing high priority information data of high priority. It is a data communication processing device that circulates upward and transmits and receives the frames of each station in a time-division manner, acquires the transmission right when receiving the frame of its own station, and stores the low priority information in the low priority information data area of this frame. It has a first transmitting means for storing data, and a second transmitting means for acquiring a transmission right when receiving a frame of each station and storing the high priority information data in the high priority information data area of this frame. A data communication processing device characterized by the above.