JPH08115284A - Crt switching method - Google Patents

Abstract

PURPOSE: To provide the CRT switching method capable of connection switching from the CRT side to a connected host in a distributed system. CONSTITUTION: The host switching screen showing a list of registered host computers is called onto a CRT by a key operation (S301), and the switching destination host name is selected from the host switching screen where connected hosts, connectable hosts, unconnectable hosts are classified by color and are displayed (S302). When an unconnectable host is selected, red error display is given (S303). When normal selection is performed, a CRT connection switching request including information of CRT NO, initial display screen NO, etc., is sent to the switching destination host from the CRT side through a LAN data way, and the connected host and the CRT are disconnected after procedures of connection switching to the switching destination host, and this host is newly connected to the pertinent CRT, and the initial screen is displayed on this CRT (S304).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a CRT switching method for switching a connection CPU of a CRT in a distributed system by a predetermined screen operation.

[0002]

2. Description of the Related Art In a conventional host computer-based process, for example, the contents of collected data processed by a terminal side CPU or the like at an operation site are sent to the host computer, and the terminal side is controlled based on the processing result of the host computer. there were.

[0003]

However, in such a conventional system, the throughput (system operating efficiency) is increased due to the complexity of the controlled object and the expansion of the system.
However, to some extent, a distributed system of the RPC method, which improves the functionality of the system by performing parallel independent processing even in remote CPUs in the network, has been introduced to some extent. Since the CRT display process that is most necessary when grasping the situation concretely and making settings etc. was a subordinate passive process, the connection host computer was switched from the CRT side to obtain the required display function. There was a problem that it was difficult to deal with it.

Therefore, an object of the present invention is to provide a CRT switching method capable of switching the connected host computer from the CRT side by a simple operation to improve the system throughput.

[0005]

In order to achieve the above object, the present invention according to claim 1 is registered in a distributed system connected by data ways forming a transmission line of an optical LAN. Host switching screen display means for displaying a host switching screen showing a list of a plurality of host computer names on the CRT, switching destination host selecting means for selecting a switching destination host computer from the host computer list of the host switching screen, and The gist is to have a switching notifying means for notifying the switching destination host computer of the CRT connection switching request, and for notifying the switching destination host computer selected from the CRT side to switch the connection to the CRT. .

According to a second aspect of the present invention, a switching result receiving means for receiving a switching result notification from the switching destination host computer, and a switching result judgment for judging whether or not a connection switching procedure to the CRT is possible based on the switching result notification. Means and a procedure terminating means for performing a connection / disconnection procedure of the CRT when the switching is successful, and after confirming the success of the CRT switching connection of the switching destination computer, after the switching procedure is completed, the CRT is connected from the host computer being connected. The main idea is to separate them.

According to a third aspect of the present invention, in a distributed system connected by a data way forming an optical LAN transmission line, a notification receiving means for receiving a notification of a CRT connection switching request from a calling side, and the CRT. The memory rewriting means for rewriting the memory based on the information of the connection switching request, and the switching result notifying means for returning the switching result notification to the calling side after the memory rewriting is completed, have the CRT from the switching destination host computer to the calling side. The gist is to notify the switching result of the end of the memory rewriting based on the connection switching request.

According to a fourth aspect of the present invention, there is provided a switching result judging means for judging whether or not the switching procedure of the CRT is possible, and a CRT connecting means for connecting with the CRT if the switching is successful.
The gist of the present invention is to have an initial screen display means for displaying an initial screen on the connected CRT, confirm the success of the switching, and connect from the switching destination host computer to the switching request destination CRT to display the initial screen. There is.

[0009]

According to the first aspect of the present invention, the host switching screen displaying means displays the list of host computers on the host switching screen, and the switching destination host selecting means selects the switching destination host computer from the host switching screen to perform switching. CR to the switching destination host computer by notifying means
Since the connection switching request of T is notified, the connection switching request can be notified from the CRT side to the selected switching destination host computer by a simple operation on the host switching screen.

According to the second aspect of the present invention, the switching result receiving means receives the switching result notification from the switching destination host computer, judges whether the connection switching procedure is possible, and if the switching is successful, the procedure ending means is connecting. Since the connection between the computer and the CRT is disconnected, the connection between the connecting host computer and the CRT can be disconnected after waiting for the result of the switching procedure between the switching destination host computer and the CRT.

According to the present invention of claim 3, the notification receiving means receives the CRT connection switching request from the calling side,
The memory rewriting means rewrites the memory based on the information content of the CRT connection switching request, and the switching result notification is returned to the calling side via the switching result notifying means. Therefore, the switching destination host computer sends the CRT connection switching request information to the calling side. The memory can be rewritten according to the contents, and a switching result notification notifying that the procedure of CRT connection switching has been completed can be returned.

According to a fourth aspect of the present invention, the switching result judgment means checks the switching procedure of the CRT, the CRT connection means physically connects the CRT and the switching destination computer, and the initial screen display means initializes the CRT. Since the screen is displayed, the host computer and CRT that are currently connected
After the connection is disconnected, the switching destination host computer is connected to the CRT, and the operator can recognize the connection switching of the host computer by the initial screen display.

[0013]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is a schematic diagram of a distributed system in which a CRT switching method according to an embodiment of the present invention functions. FIG. 2 is an explanatory diagram of a switching operation of the connected host CPU of the CRT shown in FIG. FIG. 3 is a flowchart showing the procedure of the host CPU switching operation shown in FIG. FIG. 4 is a detailed view of the host switching screen shown in FIG. FIG. 5 is a functional block diagram of the CRT switching method of the present invention. FIG. 6 shows C shown in FIG.
It is a flowchart of a process in the RT switching method.

In FIG. 1, a plurality of host computers 1 (which have no special meaning but are abbreviated as KHF) are provided at nodes on respective dataways A and B of a distributed system constituted by an optical LAN or the like, 2 (KHM ), 3, 4, 5 (KH
Q) is connected. The remote CPUs 6, 7, 8, 9, 10, 11 are connected to the nodes on the data way A, and the remote CPU 11 has a CRT (12),
The remote CPU 6 has three CRTs (16) (17)
(18) has two CRTs (1
4) (15) is connected.

On such a distributed system, if the FRT key corresponding to the "host switching screen call key code" on the CRT side, as shown in FIG.
The host switching sequence shown in Fig. 2 is started, and the host switching screen 20 showing the host name as shown in Fig. 2 is displayed as C.
It is displayed on the RT (S301). Host switching screen 20
As shown in Fig. 4, a list of registered host names (10 in this case is displayed) is displayed, and the host computer currently connected to the CRT (abbreviated as "host" hereafter) can be connected in light blue. The host name is displayed in green, and the unconnectable host name is displayed in red to make it easy for the operator to see.

Next, the operator selects the switching destination host No. on the host switching screen 20 by a simple operation such as mouse click (S302). In the case where the unselectable host No. is mistakenly selected on the host switching screen 20 by the selection operation, “*” is displayed in red to notify the error (S
303).

When the switching destination host NO is normally selected,
When the “SEND” key is pressed to notify the switching destination host and the initial screen 21 as shown in FIG. 2 is displayed from the switching destination host, the operator has been connected until now, for example, connecting host 5 (KHQ) From the destination host 1 (KH
It is determined that it has been switched to F) (S304).

FIG. 5 is a detailed functional block diagram of the system in which a host (eg, KHQ) currently connected to a CRT is connected.
From the CRT side such as a remote CPU (for example 11) and a CRT (for example 12).
Host switching screen 2 displayed on CRT (12) by 0
0, the switching destination host selecting means 51 selects a switching destination host (for example, KHF), and by operating the "SEND" key, the switching notifying means 52 performs the other system task start procedure via the data way A, "CRT connection switching request" with information "CRT NO, initial display screen NO, etc." is transmitted.

The notification receiving means 53 of the switching destination host KHF receives the notification of the connection switching request, detects that the notification is addressed to itself and receives the information, and the memory rewriting means 54 transfers the connected device information to the CRT (12). After rewriting, the end of rewriting is returned from the switching result notifying means 55 to the calling side.

Upon receipt of the reply notification, the switching result receiving means 56 on the CRT side judges the contents by the switching result judging means 57. If the switching is successful (memory rewriting ends), the procedure ending means 58 judges that the procedure ends and the CRT ( 12) Disconnect the connection with. After the connection disconnection processing between the connecting host KHQ and the CRT (12), the switching result judgment means 5 of the switching destination host KHF 5
9 confirms the disconnection between the CRT (12) and the host being connected, the CRT connection means 60 performs the connection processing with the CRT (12), and the initial display means 61 displays the initial screen specified on the CRT (12). 21 is displayed.

Next, the overall operation will be described with reference to the flowchart of FIG. First, when the operator operates the F15 key, the host switching screen display means 50 displays the host switching screen 20 on the CRT (12) (6
01). When the switching destination host selecting unit 51 selects the switching destination host 1 KHF from the host list on the host switching screen 20 (S602) and the "SEND" key is pressed, the switching notifying unit 52 causes the switching notification unit 52 to change according to the system protocol.
The other task activation procedure that activates the program of the switching destination host KHF is invoked, and "CRT NO, initial display screen NO
As a CRT connection switching request including information such as "etc.", for example, a "CRT attach command" having parameters as shown in FIG. 10 is transmitted (S603).

Here, the communication between these respective host nodes is basically based on the LAN protocol. For example, a token (transmission right control information) is obtained between the respective nodes to establish a logical link, and a limitation is imposed. Although various protocols are prepared such that communication of information is required to be completed in time and communication success or failure is notified by the parameter “status”, the protocol itself is outside the scope of the present invention.

On the side of the switching destination host KHF which has received the notification of "CRT connection switching request", the notification receiving means 53 detects that the notification is addressed to itself and receives the information content (S604). The memory rewriting means 54 rewrites the device information in the memory according to the contents of the received "CRT connection switching request" (S60).
5). After the completion of the rewriting of the memory, the switching result notifying means 55 notifies the originating side of the completion of the rewriting as a "switching result" in the form of "host switching command" in FIG.
06).

The switching result receiving means 56 on the transmitting side receives the "switching result" from the switching destination host KHF (S60).
7) Then, the switching result judging means 57 judges the reply contents (S608). If the result of the determination is that the switching is not working, CRT (1
2) Display an error message on top and end the process (S
609). If the switching is successful, the procedure ending means 58 disconnects the connection between the connected host KHQ and the CRT (12) based on the "CRT detach command" as shown in FIG. 9 (S).
610).

Subsequently, when the "CRT detach command" is issued on the CRT side, the switching result judging means 59 of the switching destination host KHF sends out the "connecting host name transmission command" as shown in FIG. Host K receiving "space" and connecting
It is confirmed that the connection between the HQ and the CRT (12) is cut off (S611). The CRT connection means 60 connects to the CRT (12) based on the "host switching command" (S61).
2), the initial screen display means 61 indicates the initial display screen NO specified in the rewriting information in the memory on the CRT (12).
The initial screen of is displayed (S613).

Up to now, the connecting host 5 KH
Q, switching destination host 1 KHF, remote CPU 11, C
Although a specific example has been described as the RT (12), it goes without saying that the same operation is performed in the case of another host, remote CPU, or CRT.

[0028]

As described above, the CRT according to the present invention.
According to the switching method, the host switching screen showing the list of host computer names is displayed on the CRT, the switching destination host is selected on the host switching screen, and the CRT side notifies the switching destination host of the CRT connection switching request. , Waiting for the reply of the switching result from the switching destination host, if the switching is successful, disconnect the connecting host and the CRT, and after confirming the disconnection between the CRT and the connecting host, the switching destination host connects to the CRT. Since the initial screen is displayed, it is possible to switch the connection of the connected host from the CRT side by a simple switching operation, and it is possible to improve the system throughput by taking a functional measure.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a distributed system in which a CRT switching method according to an embodiment of the present invention functions.

FIG. 2 is an explanatory diagram of a connected host CPU switching operation of the CRT shown in FIG.

FIG. 3 is a flowchart showing a procedure of a host CPU switching operation shown in FIG.

FIG. 4 is a detailed view of a host switching screen shown in FIG.

FIG. 5 is a functional block diagram of a CRT switching method of the present invention.

6 is a flowchart of processing in the CRT switching method shown in FIG.

FIG. 7 is a diagram showing an example of parameters of a host switching instruction of the present invention.

FIG. 8 is a diagram showing an example of parameters of a connecting host name transmission command of the present invention.

FIG. 9 is a parameter 1 of the CRT detach command of the present invention.
It is a figure showing an example.

FIG. 10 is a diagram showing an example of parameters of a CRT attach instruction of the present invention.

[Explanation of symbols]

 1-5 Host computer 6-11 Remote CPU 12, 14-18 CRT 20 Host switching screen 21 Initial screen 50 Host switching screen display means 51 Switching destination host selecting means 52 Switching notifying means 53 Notification receiving means 54 Memory rewriting means 55 Switching result Notifying means 56 Switching result receiving means 57 Switching result judging means 58 Procedure ending means 59 Switching result judging means 60 CRT connection means 61 Initial screen display means

Claims (4)

[Claims] 1. A host switching screen display means for displaying a host switching screen showing a list of a plurality of registered host computer names on a CRT in a distributed system connected by data ways forming an optical LAN transmission path. And a switching destination host selecting means for selecting a switching destination host computer from the list of host computers on the host switching screen, and a switching notifying means for notifying the selected switching destination host computer of a CRT connection switching request. A CRT switching method characterized in that a notification is sent from the CRT side to a switching destination host computer requesting switching of connection to the CRT. 2. The CRT switching method according to claim 1, wherein a switching result receiving unit that receives a switching result notification from the switching destination host computer, and whether or not a connection switching procedure to the CRT is possible are determined from the switching result notification. It has a switching result judging means and a procedure terminating means for performing a connection disconnection procedure of the CRT when the switching is successful, and after confirming the CRT connection switching success of the switching destination host computer, the CRT is connected as the switching procedure ends. A CRT switching method characterized by being separated from a middle host computer. 3. In a distributed system connected by a data way forming an optical LAN transmission line, a notification receiving means for receiving a notification of a CRT connection switching request from a calling side, and based on the information of the CRT connection switching request. It has a memory rewriting means for rewriting the memory and a switching result notifying means for returning a switching result notification to the calling side after the memory rewriting is completed, and the memory rewriting end based on the CRT connection switching request from the switching destination host computer to the calling side. CRT switching method characterized in that the switching result notification is performed. 4. In a distributed system connected by data ways forming a transmission line of an optical LAN, a notification receiving means for receiving a notification of a CRT connection switching request from a calling side, and based on the information of the CRT connection switching request. It has a memory rewriting means for rewriting the memory and a switching result notifying means for returning a switching result notification to the calling side after the memory rewriting is completed, and the memory rewriting end based on the CRT connection switching request from the switching destination host computer to the calling side. CRT switching method for notifying the switching result, the switching result judging means for judging whether or not the switching procedure of the CRT is possible, the CRT connecting means for connecting with the CRT if the switching is successful, and the connected CRT. The initial screen display means for displaying the initial screen on the CRT switching method and displaying the initial screen makes a connection with the previous CRT.