JPS6166437A - Multi-host attachment - Google Patents

Abstract

PURPOSE:To test efficiently a new data processor by using a switching section to change over transmitting a polling signal from either a new or an old data processor in conducting polling from the new or the old data processor. CONSTITUTION:A multi-host attachment 30 is connected to the new data processor 20 and the old data processor 21 by interface sections 31, 32 and connected to one network by an interface section 33. A switching section 34 outputs any one of transmission signals from the data processors 20, 21 to the network side. The signal from the network is outputted to both the data processors 20, 21.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention provides a loop network system having a multi-drop configuration in which a data processing device and a data terminal are connected via a network. This article relates to a multi-host attachment that allows efficient testing of new data processing equipment when replacing it with a new data processing equipment for upgrades, etc.

In the above system, when replacing the data processing device with a new data processing device, it is desirable that the new data processing device can be easily tested without providing any processing function to the nodes of the loop network.

[Conventional technology]

When replacing the above system with a new data processing device, test the new data processing device by programming the new data processing device as if it were connected to a data terminal. Although there is a method, it is very difficult to test all operations because it is a pseudo data terminal using a program.

For this reason, conventionally, a new data processing device 20 as shown in FIG.
and node 1 of the loop network in which the old data processing device 21 has a multi-drop configuration. Connected to node 8, the old data processing device 21 performs polling, the old and new data processing devices 20.21 receive responses from the data terminals 10-15 connected to nodes 2 to 7, and the new data processing device 20 A test is performed to see if the processing can be performed in the same way as the old data processing device 21. Next, the new data processing device 20 performs polling, and the old and new data processing devices 20 and 21 receive responses from the data terminals 10 to 15. There is a method of testing whether the data processing device 21.20 can process as before.

[Problem that the invention seeks to solve]

However, normally, for example, data transmitted from the old data processing device 21 and response data from the data terminals 10 to 15 are prevented from going around the loop when they reach the node 8 to which the old data processing device 21 is connected. Therefore, these data are processed by the old data processing device 21 so as not to go to the next node 1.

Therefore, when performing the above test, the old data processing device 2
When polling is performed from 1, data terminals 10-15
Of course, the response data from node 8. is sent to the old data processing device 21. There is a problem that the nodes 8 and 1 need to have the function of sending data to the new data processing device 20 via the node 1, which makes the nodes 8 and 1 complicated.

[Means for solving problems]

The above problem is caused by the interface unit connecting to each of a plurality of data processing devices, the interface unit connecting to one network, and the switching to output one of the transmission signals from the plurality of data processing devices to the network side. The problem is solved by using the multi-host attachment of the present invention, which has the function of outputting signals from the network and the plurality of data processing devices to all the plurality of data processing devices.

[Effect]

By using the multi-host attachment of the present invention and connecting a new or old data processing device and one node of the loop network to the corresponding interface section of this multi-host attachment, you can connect the new or old data processing device to the corresponding interface section. When performing polling, the switching unit can switch to send a polling signal from either the new or old data processing device, and the response from the data terminal in either case can be determined by the connection of the multi-host attachment. Since the data is received in parallel by the old and new data processing devices via the connected nodes, the same tests as in the conventional case can be performed without providing any special functions to the nodes.

〔Example〕

FIG. 1 is a block diagram of an embodiment of the present invention in which a multi-host attachment is used to connect old and new data processing devices to a loop network system for testing.

In the figure, 30 is a multi-host attachment, 31 to 33
Reference numeral 34 indicates an interface section, 34 indicates a switching section, and the same reference numerals indicate the same functions throughout the drawings.

To explain the operation, when polling is performed from the old data processing device 21, the switching unit 34 is switched to the old data processing device 21.
The new data processing device 2 sends out more polling signals.
If the gate is controlled and switched using, for example, an electric signal so that the polling signal from the old data processing device 21 is not sent, the polling signal from the old data processing device 21 is transmitted to the interface section 32. Switching section 34, interface section 33. The response signal is sent to the data terminals 10 to 15 via node 1, and the response signal is sent to node 1.

Interface section 33. Interface parts 31 and 32
When polling is performed from the new data processing device 20, the switching unit 34 sends the polling signal from the new data processing device 20, but not the polling signal from the old data processing device 21. If the gate is controlled and switched using, for example, an electric signal so that the polling signal is not sent, the polling signal of the new data processing device 20 is transmitted to the interface section 31. Switching section 34. Interface section 33. The response signal is sent to the data terminals 10 to 15 via the node 1, and the response signal is sent to the node 1 interface section 33. New and old data processing device 20 via interface sections 31 and 32
．． 21, and the same test as before can be performed without adding any processing functions to nodes 1 and 8.

〔Effect of the invention〕

As explained in detail above, according to the present invention, there is an effect that the same test as the conventional test can be performed without adding any processing function to the node.

[Brief explanation of drawings]

Figure 1 is a block diagram of an embodiment of the present invention in which a multi-host attachment is used to connect old and new data processing devices to a loop network system for testing. Figure 2 is a conventional loop network system. FIG. 2 is a block diagram when testing is performed by connecting old and new data processing devices to the computer. In the figure, 1 to 8 are nodes, 10 to 15 are data terminals, 20 is a new data processing device, 21 is an old data processing device, 30 is a multi-host attachment, 31 to 33 are interface units, and 34 is a switching unit. .

Claims (1)

[Claims] an interface unit that connects to each of the plurality of data processing devices, an interface unit that connects to one network, a switching unit that outputs any one of the transmission signals from the plurality of data processing devices to the network side, and from the network A multi-host attachment having a function of outputting a signal to all of the plurality of data processing devices.