JPH0357344A - Data transmitter - Google Patents

Abstract

PURPOSE:To easily recognize the state of all nodes forming a loop by circulating a token with a node state able to be embeded therein onto a data transmission line. CONSTITUTION:When a command analysis circuit 120 recognizes the arrival of a command reading the nose state of each node via a data input/output line 15 and a data transmission/reception circuit 111, a communication control circuit 122 awaits the arrival of a token and informs the transmission of a node state readout token 300 for the readout of internal information to a data transmission line 9 when the token is reached. When the arrival of the token is informed from a frame analysis circuit 130 to the circuit 122, a command of sending the token 300 to the transmission line 9 is given to a protocol control circuit 131. In this case, when a destination address field 302 and a sender address field 303 are set the same, that is, to an address of a data transmitter 4, since the token 300 returns so long as no fault exists in the transmission line 9, the circuit 122 awaits the return of the token. The operation is implemented by the data transmitter 4.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention is applied to a loop network that performs data transmission using a token bashing method. In particular, the present invention relates to a means for easily manipulating information within nodes configuring a network.

〔overview〕

The present invention is a means for manually obtaining information within nodes of a network that transmits data by circulating tokens, and by circulating tokens in which node states can be embedded on data transmission paths, it is possible to easily check the states of all nodes. It was made so that people could know about it.

[Conventional technology]

In the conventional example, the internal information of the data transmission device is only displayed on a panel etc. equipped with each data transmission device, and the internal information of the data transmission device cannot be manually accessed at all, or the data transmission device The internal information of only one node can be manually read using this means.

[Problem that the invention seeks to solve]

In such conventional examples, it is either impossible to read the internal information of the data transmission device at all, or it is not possible to read the internal information of the data transmission device at all. It was necessary to read the internal information and repeat the internal information reading process while changing the nodes to be read sequentially, which required complicated processing to read the information of all the nodes, and it was also difficult to collect information. This has the drawback that other communications to the node are forced to wait temporarily, and the throughput of data transmission to one node is reduced.

The present invention aims to eliminate such drawbacks, and has as its object the provision of a data transmission device having means for easily reading out node information.

[Means for solving problems]

The present invention provides a data transmission device inserted into a loop transmission path through which tokens for signal transmission circulate, in which a predetermined device includes an address given to the device and a connection state between the own device and the loop transmission path. A generating means for generating a new token different from the above token, including an area capable of storing node status information reading commands and node status information related to all data transmission devices, and a generating means for generating a new token different from the above token, and replacing the above token with the new token for the above loop transmission. It is equipped with a sending means for sending the node status information related to all the data transmission devices from a new token that has made a circuit around the loop transmission path, and an extraction means for extracting the node status information related to all the data transmission devices from the new token that has made a circuit around the loop transmission path. The present invention is characterized by comprising a storage means for storing node status information related to the own device in this new token in response to a read command.

[Effect]

A token used by a data transmission device that becomes a node in a loop network and transmits data using the token bashing method includes the address given to all data transmission devices in the network and the transmission path of each 7th node. A field for instructing the data transmission device to read the connection status of the data transmission device, and a field having an arbitrary length for storing the node status read from the data transmission device in the token frame. It extracts only the field that stores the code status from the token, and also checks the address given to each data transmission device when receiving a token sent from another data transmission device and the data transmission of the data transmission device. The connection state for the path is stored in a field of arbitrary length provided in the token, and when the node state acquisition token goes around the loop, all the 71-do states that make up the loop are manually checked.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows the structure of a loop network system comprised of data transmission devices. This system includes data transmission devices 1, 2, 3, and 4, computer device groups 5, 6, 7, and 8 connected to the data transmission devices, and a data transmission path 9 connecting the data transmission devices.

FIG. 2 is a block diagram showing the structure of the data transmission device shown in FIG. 1. Each of the data transmission devices 1, 2, 3, and 4 has connection control g! ! ) 11, communication control section 12, data ring control section 13, and loop connection section 14
It consists of. The data output line 15 is a data transmission device l,
2, 3 and 4 and electronic computer equipment groups 5, 6, 7 and 8.
This is a signal line that connects the

Here, the connection control section 11 includes a connection control circuit 110 and a data transmission/reception circuit 111, and the communication control section 12 includes:
It consists of a command analysis circuit 120, a data buffer 121, a communication control circuit 122, and a node information storage area 123.
30 , a protocol control circuit 131 , a frame generation circuit 132 , and a frame buffer 133 .
It consists of 2. The optical signal transmission/reception line 142 transmits and receives information replaced with an optical signal via the data transmission line 9.

FIG. 3 shows the structure of a token for reading internal information of data transmission devices 1, 2, 3, and 4.

The node status reading token 300 includes a delimiter field 301 indicating the start and end of a frame, a destination address field 302 indicating the destination of the frame, and a source address field 3 indicating the source of the frame.
03, a function field 304 indicating that this frame is a token for reading the node state, and a node state storage field 305 having a variable length for storing the read node state in the token frame, and sends out a token frame. It also includes an error checking information field 306 for detecting errors when they are incorporated.

That is, in this embodiment, a token for signal transmission is inserted into the loop transmission path 9 that circulates, and a predetermined device has a node that includes the address given to the device and the connection state between the device itself and the loop transmission path 9. frame generating means 132, which is a generating means for generating a new token different from the above-mentioned token, including an area capable of storing status information reading commands and node status information related to all data transmission devices;
The protocol control circuit 13 is a sending means that sends this new token to the loop transmission line 9 instead of the above token.
1 and a communication control circuit 122 that is an extraction means for extracting node status information related to all data transmission devices from a new token that has made a circuit around the loop transmission path 9. Storage means frame analysis circuit 13 stores node status information related to the own device in this new token in response to a reading command issued by the user.
0.

Next, the operation of this embodiment will be explained using FIGS. 1, 2, and 3.

The data transmission devices E to 4 provide a data transmission function between the computer devices 5 to 7 by using one token that circulates in a fixed direction on the data transmission path 9. Each data transmission device 1 to 4 converts a frame that enters the optical signal transmission/reception circuit 142 from the data transmission line 9 into an optical-electrical signal conversion circuit! After converting to an electrical signal at 140, frame buffer 1
33 is temporarily stored. When the frame analysis circuit 130 recognizes that the received frame is a token, it inquires of the communication control circuit 122 whether there is a data transmission request. The command analysis circuit 120 analyzes the command to the data transmission device received in advance by the data transmission/reception circuit 111 via the data input/output line 15, and when there is a data transmission request, the data transmission factor is stored in the communication control circuit 122. The information is stored, and a response of "Yes" to the transmission request is made in response to the inquiry. Thereafter, a frame generation circuit 132 creates a frame to send out the data in the data buffer 121 via the protocol control circuit 131, converts the optical signal in the electro-optical signal conversion circuit 141, and then converts the data from the optical signal transmission/reception circuit 142. A frame containing sending data is sent to the transmission path 9. Here, in response to the inquiry from the communication control circuit 122, a transmission request "
When the protocol control circuit 131 receives the notification of no request,
Temporarily stored in the frame buffer 133, the frame, or token, is not passed through the frame generation circuit 132, but is sent to the electro-optical signal conversion circuit 141 and the optical signal transmission/reception circuit 142.
The data is retransmitted to the data transmission line 9 via the data transmission line 9. Data transmission device 1
Each of 4 to 4 operates according to this logic.

Here, the operation of the data transmission devices 1 to 4 when the computer device group 8 connected to the data transmission device 4 wants to obtain the node status of the data transmission devices 1, 2, 3, and 4 will be described.

When the command analysis circuit 120 learns that a command to read the node status of each node has arrived via the data output line 15 and the data transmission/reception circuit 111, it waits for the arrival of the token in the communication control circuit 122, and when the token arrives, A notification is sent to the data transmission path 9 to send out the node status reading token 300 for reading internal information.

When the communication control circuit 122 is notified of the arrival of the token from the frame analysis circuit 130, the protocol control circuit 131
It instructs the node status reading token 300 to be sent onto the data transmission path 9. At this time, the destination address field 302 and the source address field 30
3 to the same address, that is, the address of the data transmission device 4, the node status reading token 300 will be returned unless there is a failure in the data transmission path 9, and the communication control circuit 122 will wait until then. This operation is performed by the data transmission device 4.

Now, the data transmission devices 1, 2, and 3 perform the above-mentioned normal operation and transmit data while repeating securing and sending tokens. At this time, the frame analysis circuit 1
30 examines the function field 304 of the received token and finds that it is a token 300 for reading the node status.When resending the token to the communication control circuit 122 and protocol control circuit 131, the node information storage area 123 retains the token. The node status storage field 30 in the node status reading token 300
Give instructions to embed in 5. If the transmission request disappears or if the token is to be returned to the data transmission path 9 immediately, the frame generation circuit 132 receives instructions from the protocol control circuit 131 from the network stored in the node information storage area 123. Information indicating the node address given to the data transmission device above and the connection state to the data transmission path 9 is stored in the node status storage field 305.
Embed it inside. (Here, it is easy to embed other information held in the node information storage area 123, such as log information of failures that have occurred within the node, into the node status storage field 305 as necessary.) After that, The error checking information field 306 is reconfigured and the node status reading token 300 is sent onto the data transmission line 9 using the same procedure as in normal operation. These operations are performed by data transmission devices 1, 2, and 3.

Now, when the node status reading token 300 goes around the loop and returns to the data transmission device 4, the communication control circuit 122, which was on standby, returns the node status reading token 300 sent by itself from the frame analysis circuit 130. I was informed that he had arrived. The communication control circuit 122 extracts only the information in the node state storage field 305 from the node state reading token 300 and sends it to the data buffer 121 . Finally, on the data buffer 121, the node status of the own device is retrieved from the node information storage area 123 and added, and the status of all nodes constituting the loop network is acquired through the data transmitting/receiving circuit 111 and the data input/output line 15. Requested computer equipment group 8
Send to. Thereafter, the data transmission device 4 stores the token in the frame buffer 133 and retransmits the normal token onto the data transmission path 9, completing the series of operations.

〔Effect of the invention〕

As explained above, the present invention circulates tokens in which node states can be embedded on a data transmission path, so that each node embeds its own node state in the token when the token is no longer needed. Since the token is returned, the effect is that when the node that originally sent the token goes around the loop and returns, you can easily know the status of all the nodes that make up the loop by looking at the field that stores the node status. There is. Furthermore, since a token frame is used, there is an effect that the throughput of general data transmission is not reduced in obtaining the node status.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the overall structure of an embodiment of the present invention. FIG. 2 is a block diagram showing a partial structure of an embodiment of the present invention. FIG. 3 is a format diagram showing the structure of a token used in an embodiment of the present invention. l, 2, 3, 4...data transmission device, 5, 6, 7, 8
...Electronic computer equipment group, 9...Data transmission path, l1
... Connection control section, 12... Communication control section, 13...
Data ring control section, l4... loop connection section, l5.
...Data input/output line, 110...Connection control circuit, 11
DESCRIPTION OF SYMBOLS 1... Data transmission/reception circuit, 120... Command analysis circuit, 121... Data buffer, 122... Communication control circuit, 123... Node information storage area, 130...
Frame analysis line, 131... protocol control circuit,
132... Frame generation circuit, 133... Frame buffer, 140... Optical electrical signal conversion circuit, 141
. . . Electrical optical signal conversion circuit, 142 . . . Optical signal transmission/reception circuit, 300 .
01... Delimiter field, 302... Destination address field, 303... Source address field, 304... Function field, 305... Node status storage field, 306... Information field for error checking .

Claims (1)

[Claims] 1. In a data transmission device inserted into a loop transmission path in which tokens for signal transmission circulate, a given device has an address given to the device and a link between the own device and the loop transmission path. A generating means for generating a new token different from the above token, including an area capable of storing a command to read node status information including connection status and node status information related to all data transmission devices, and replacing the new token with the above token. and extraction means for extracting node status information related to all the data transmission devices from new tokens that have made a circuit around the loop transmission path. A data transmission device comprising a storage means for storing node status information related to the device itself in a new token in response to a read command included in the token.