JPH0991574A - Line disconnecting device for terminal device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the line disconnecting device for the terminal device which is enabled to transmit abnormality information on facility equipment preferentially to other abnormality information without providing any inter-device transmission interface circuit. SOLUTION: A 1st terminal device 1 which monitors facility equipment 3 and a 2nd terminal device 2 which monitors facility equipment 4 that can not be monitored by the 1st terminal device 1 are connected to a monitor center device 6 by a single telephone line 5; when the 1st terminal device 1 detects abnormality of the facility equipment 3 of higher emergency priority and a line use detecting device 11 detects the transmission state of the 2nd terminal device 2, an abnormality data generating device 12 places a network control unit 10 to disconnect the telephone line 5 form the 2nd terminal device 2 and also connect the telephone line 5 to the 1st terminal device 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a line disconnecting device for a terminal device, and more particularly to a line disconnecting device for a terminal device in a remote monitoring device configured by connecting a plurality of terminal devices through a single telephone line.

[0002]

2. Description of the Related Art A conventional line disconnecting device for a terminal device is, for example, as described in JP-A-6-6485, a plurality of remote monitoring devices are connected to the same communication line.
It is configured to transmit the usage right request information of the communication line between the remote monitoring devices and determine it, and send the error information detected by each remote monitoring device to the receiving device separated via the communication line. You have to wait for the information to be sent out,
I was trying not to be interrupted.

[0003]

However, the conventional line disconnecting device of the terminal device transmits the usage right request information of the same communication line between the remote monitoring devices and transmits the abnormality information detected by each remote monitoring device. Since it was checked and it was decided whether to switch the line usage right according to the degree of urgency and to transmit to the remote receiving device, the line usage right request information for switching the communication line usage right is transmitted between the remote monitoring devices. It was necessary to provide a device-to-device transmission interface circuit. Further, even when a device such as a FAX that transmits data for a long time and a terminal device of a remote monitoring device are connected to the same communication line, line usage right request information for switching the usage right of the communication line is displayed. It was necessary to provide an inter-device transmission interface circuit for transmission. However, since the fax or the like has a lower emergency priority than the abnormal state notification of facility equipment and can be retransmitted even if interrupted midway, it is necessary to give priority to information on the abnormal state of facility equipment.
Also, by using this inter-device transmission interface circuit, there is a concern that the responsiveness may decrease in data communication between the inter-device transmission interface circuits, or correct switching may not be possible if an error occurs in the data communication. There is.

An object of the present invention is to provide a line disconnecting device for a terminal device having a simple structure in which abnormal information of equipment is transmitted with priority over other abnormal information without providing an inter-device transmission interface circuit. To provide.

[0005]

In order to achieve the above object, the present invention provides a first terminal device for monitoring equipment equipment connected to a monitoring center device via a single telephone line, and a first terminal device for monitoring the equipment. In a line switching device of a terminal device, which comprises a second terminal device for monitoring facility equipment that cannot be monitored by the terminal device, and which switches and connects the first terminal device and the second terminal device to the telephone line, The first terminal device is configured to monitor the abnormality of the equipment device having a higher emergency priority than the equipment device monitored by the second terminal device, and the abnormality of the equipment device by the first terminal device. When an error is detected, an abnormal data generator for switching and connecting the first terminal device to the telephone line is provided.

[0006]

The line disconnecting device of the terminal device according to the present invention is
As described above, when it is necessary to notify an abnormal condition of equipment with high emergency priority, the notification of other equipment with low emergency priority is temporarily disconnected from the telephone line and stopped, and equipment with high emergency priority is notified. Since the abnormal data generator that reports abnormal data to the monitoring center is provided, even if information is being communicated from the second terminal device to the monitoring center device via a single telephone line, it can be used for equipment with low emergency priority. On the other hand, it is possible to prioritize the abnormal condition notification of equipment with high urgent priority, and without providing the inter-device transmission interface circuit, the abnormal information of equipment with high urgent priority can be transferred to other information with a simple configuration. Can be sent with priority.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of a line disconnecting device of a terminal device according to an embodiment of the present invention. The equipment 3 is monitored by the first terminal device 1 and has a lower emergency priority than the abnormal state notification of the equipment 3, and the equipment 4 such as FAX that can be retransmitted even if interrupted midway It is monitored by the second terminal device 2. A network control device 10, a line use detection device 11, and an abnormal data generation device 12 are provided in the first terminal device 1, and a network control device 20 is provided in the second terminal device 2. . First terminal device 1
Is connected to a monitoring center device 6 which reports the status of the equipment 3 and 4 via a single telephone line 5 and causes the display to display the status of the equipment.

FIG. 2 is a circuit diagram showing details of essential parts in the first terminal device 1, and lines L1 and L2 connected to a single telephone line 5 are network control devices of the first terminal device 1. The second terminal device 2 is connected via the output terminals T1 and T2 of the network control device 10. An abnormal data generator 12 is connected to the other internal connection terminal of the network controller 10.

Next, the operation of the above-mentioned line disconnecting device of the terminal device will be described. 3 and 4 are transmission processing diagrams between the terminal device and the monitoring center, which will be described together with the flowchart shown in FIG. First, step S11
Then, it is determined whether or not an abnormality has occurred in the equipment 3
Is determined in the first terminal device 1 that is monitoring. If the equipment 3 is in a normal state and no abnormality has occurred, the work here ends, but at this time, the second terminal device 2
If a large amount of data is communicated by the network control device 10 built in the first terminal device 1 ... telephone line 5 ... the circuit of the monitoring center device 6, between the terminal device side and the monitoring center device 6 In the transmission processing, as shown in FIG. 3, the terminal device side reports the data 31 of the terminal device 2, and if the reported data is normal, the monitoring center device 6 sends an affirmative signal ACK.
The operation of returning 32 to the terminal device side, then reporting the data 33 of the terminal device 2, and if the reported data is normal, the monitoring center device 6 reports an affirmative signal ACK34 to the terminal device side. The process ends repeatedly until there is no communication data.

However, when an event occurs in which the first terminal device 1 detects an abnormality in the equipment 3 in step S11 and transmits it via the telephone line 5, the line use detection device 11 operates in step S12. The second terminal device 2 determines whether the telephone line 5 is being used. As a result, if there is no communication between the second terminal device 3 and the monitoring center device 6, the network control device 10 built in the first terminal device 1 shown in FIG. Device 1
Is switched to the connection state between the inside and the telephone line 5, and the monitoring center device 6 is notified of the abnormal state of the theory zone device 3.

On the other hand, in step S12, the circuit of the network control device 10 ... Telephone line 5 ... Surveillance center device 6 in which the second terminal device 2 is built in the first terminal device 1 by the line use detection device 11 When detecting that a large amount of data is being communicated, the abnormal data generating device 12 causes the abnormal data generating device 12 to perform step S13.
To issue a circuit switching command to activate the network control device 10 incorporated in the first terminal device 1 and disconnect the connection state between the second terminal device 2 and the telephone line 5 to disconnect the second terminal device 2 and the monitoring center. The communication between the devices 6 is temporarily stopped, the inside of the first terminal device 1 and the telephone line 5 are connected, and the abnormal data generating device 12 provided in the first terminal device 1 causes the monitoring center device to operate in step S14. Report abnormal data to 6.

In the transmission processing between the terminal device side and the monitoring center device 6 at this time, as shown in FIG. 4, first, the data 41 of the second terminal device 2 is reported from the terminal device side, and it is reported. Since the data is normal, the affirmative signal ACK42 is sent from the monitoring center device 6 to the terminal device side. At this time, as described above, the network control device 10 built in the first terminal device 1 by issuing the circuit switching command in step S13.
Is activated to disconnect the connection state between the second terminal device 2 and the telephone line 5 to temporarily stop the communication between the second terminal device 2 and the monitoring center device 6, and to make a call to the inside of the first terminal device 1 and the telephone. The line 5 is brought into the connected state, and in step S14, the abnormal data generator 12 provided in the first terminal device 1 reports the abnormal data 43 from the terminal device side via the telephone line 5. Since the notified data is the abnormal data 43, the monitoring center device 6 communicates the negative signal NAK44 to the terminal device side.

After that, the process returns to step S12 again, and the line use detection device 11 determines whether or not the second terminal device 2 is using the independent telephone line 5, but by the operations of steps S13 and S14 described above. Since the second terminal device 2 has stopped using the telephone line 5, the process proceeds to step S15. Therefore, the network control device 10 built in the first terminal device 1 operates, and the second terminal device 2 and the telephone are connected via the output terminals T1 and T2 of the first terminal device 1 as shown in FIG. The line 5 is brought into the connected state and the interrupted data is transmitted to the monitoring center device 6 shown in FIG.

In this way, the notification of the abnormal state of the equipment 3 by the first terminal device 1 has a high urgent priority, and the notification of the other equipment 4 which can be retransmitted even if it is interrupted midway. Is set to have a low emergency priority, and when an abnormality occurs in the equipment 3, the abnormality data generation device 12 that terminates the notification of the equipment 4 having a low emergency priority is provided, and the telephone line 5 by the second terminal device 2 is provided. When the line use detection device 11 detects the use state of the telephone line 5, the abnormal data generation device 12 operates the network control device 10 to switch the telephone line 5 to the abnormal state notification of the equipment 3 having a high emergency priority. , Does not require a device-to-device transmission interface circuit for transmitting the line usage right request information for switching the usage right of the communication line, and also causes a decrease in responsiveness and an error in data communication. Without that problem, such as occurs can not be correct switching to such case was, it is possible to perform an efficient report.

[0015]

As described above, the line disconnecting device of the terminal device according to the present invention interrupts the notification of the equipment having a low emergency priority when detecting the abnormal state notification of the equipment having a high emergency priority. Since the abnormal data generator that switches the connection to notify the abnormal state of the equipment with high urgent priority is installed, the abnormal information of the equipment with high urgent priority is simple with a simple configuration without providing the inter-device transmission interface circuit. Can be sent in preference to other information.

[Brief description of drawings]

FIG. 1 is a block diagram of a line disconnecting device of a terminal device according to an embodiment of the present invention.

FIG. 2 is a circuit diagram showing a main part of a line disconnecting device of the terminal device shown in FIG.

FIG. 3 is a transmission processing diagram between the terminal device side of the line disconnecting device of the terminal device shown in FIG. 1 and the monitoring center device.

4 is another transmission processing diagram between the terminal device side of the line disconnecting device of the terminal device shown in FIG. 1 and the monitoring center device.

5 is a flowchart showing an operation of a line disconnecting device of the terminal device shown in FIG.

[Explanation of symbols]

 1, 2 Terminal device 3, 4 Equipment 5 Telephone line 6 Monitoring center device 10, 20 Network control device 11 Line use detection device 12 Abnormal data generation device

Claims (2)

[Claims] 1. A first terminal device that monitors facility equipment connected to a monitoring center device via a single telephone line, and a second terminal that monitors facility equipment that cannot be monitored by this first terminal device. A line switching device of a terminal device for switching and connecting the first terminal device and the second terminal device to the telephone line, wherein the first terminal device is the second terminal device. It is arranged to monitor the abnormality of the equipment having a higher emergency priority than the equipment to be monitored, and when the abnormality of the equipment is detected by the first terminal device, the first terminal device is connected to the telephone line. A line disconnecting device for a terminal device, which is provided with an abnormal data generating device for switching connection. 2. The network control device according to claim 1, wherein the first terminal device is switchably connectable to the telephone line to the first terminal device and the second terminal device. A line use detecting device for detecting that a large amount of data is transmitted from the second terminal device to the monitoring center device via the telephone line is provided, and the abnormal data generating device is provided by the line use detecting device. A line disconnecting device for a terminal device, wherein the network control device is operated to detect and switch the first terminal device to connect to the telephone line.