JPS61166257A - Remote supervisory and controlling equipment - Google Patents

Abstract

PURPOSE:To open a public line after a prescribed time even when a dead lock takes place while a line between a master station and a slave station is connected by preserving an output of a line connection command for a time required for data processing between the master and slave stations and then turning off the said output forcibly. CONSTITUTION:A caller side network controller and an incoming side network controller set respectively a slave station connection end (DSC1), CI depending on the condition of each call response and sets a line connection command (CML) of a communication line. Then a line connection control circuit 14 set by a time required for data processing in advance is started, the CML is turned off by the line connection control so as to open a public line.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a remote monitoring and control device using a public company line, and particularly to a device for controlling connection by a telephone line network control device.
:Relating to an N-polling type remote monitoring and control device.

[Background of the invention]

In the conventional device, data is transmitted from the slave station in response to a start command from the master station, as described in Fuji Jiho Vol. 53, No. 4. After receiving the required data, the master station would send a stop command to stop data transmission from the slave stations.

However, no consideration was given to cases where the stop command was not output normally or where there was an error in the call data from the master station.

First, a conventional example will be explained with reference to FIGS. 2, 3, and 4.

FIG. 2 shows a system block diagram.

Master station remote control device 2. After confirming the response from the other party, each of the remote control devices 2 and 15 outputs a one-line connection command to the network control device 1, and the public corporation line 3. Through the public corporation line network 16, the master station,
The slave station remote control devices are connected, and the system can be monitored and controlled.

FIG. 3 is a block diagram showing an interface between the remote control device 2 (15) and the network control device 1.

4 is a switching control interface connector (9 pins);
5 is an automatic call interface connector (25 pins), 6 is a communication line, 7 is a switching control signal group, 8 is an automatic call signal group, 9 is a signal transmission section, 10 is a transmission/reception processing section, 11 is a , shows a line coupling circuit.

FIG. 4 shows a detailed operation time chart shown in FIGS. 2 and 3. A detailed explanation will be given below with reference to FIG.

First, we will explain outgoing connections.

The remote control device confirms that the interface power enable signal (PI) of the network control device is ON, the call abandonment signal (ACL) and the line busy indication (DLO) are OFF, and sends a call request signal (CQR). Turn it ON. The network control device is CR
Q ON provides a dial tone delay of 3 seconds or more, a timing of 0.32 seconds to prevent call collisions, and requests the remote control device to send the other party's number information. Turn on the next number request signal (PND).

Receives a number display signal (DPR) indicating that number information is being sent from the remote control device and number information (DS1 to 8) consisting of a four-digit binary code for each digit, Convert it to Dianepulse and send it to the public company line.

Upon receiving the final number information (EON) from the remote control device,
The timing of the slave station response is monitored, and if the slave station responds within this time limit, the polarity of one line is reversed and the slave station connection is completed (DSCI
) and turn on the line connection command (CML) of the communication path.
shall be.

The network control device switches the line to the remote control device by CML ON, and also notifies the remote control device that the other party's horizontal connection is complete (DSC
2) is sent.

Using this information, the remote control device turns off a series of information including CRQ, and the device related to automatic calling is restored.

When data communication ends, CML is turned off and the public company line is released.

The exchange selects the other party based on the number information from the calling party and connects the line with the other party.

Next, incoming connection will be explained.

In response to a call signal from the calling side, a call indicator (CI) that indicates whether or not a call signal is detected in the network control device is turned ON. The remote control device sends CML to the network control device using Cl0N, and becomes ready for data communication with the calling side.

When data communication ends, CML is turned off and the public company line is released.

In this way, with conventional line connection methods, even if there is an error in the call data from the master station remote control device (number information, slave station Nα error, etc.), the network control device does not have a function such as code error detection. , the line between the master station and slave station becomes connected.

If the line between the master station and the slave station is connected in a state where there is an error in the data such as slave station Nα, the slave station remote control device will select the own station because the data of the slave station Nα does not match. This cannot be detected, and activation of the slave station remote control device becomes impossible. For this reason, the CML cannot be turned OFF, resulting in a deadlock situation, and there is a problem that smooth monitoring and control cannot be performed.

[Purpose of the invention]

An object of the present invention is to release the line connection put-lock state between the master station and the slave station in a telephone line network control device after a certain period of time due to an erroneous call data from the master station to the slave station, thereby facilitating smooth monitoring and control. The object of the present invention is to provide a 1:N polling type remote monitoring and control device that is capable of

(Hereinafter, the remote monitoring and control device will be abbreviated as the remote control device, and the telephone line network control device will be abbreviated as the network control device.) It becomes connected by a connection command. Therefore, the time required for data processing between the master station and the slave station is guaranteed for the output of the line connection command,
After that, if it is forcibly turned off, the master station becomes connected due to incorrect data and the line connection is put locked.
Communication between slave stations is also released after a certain period of time, and a new call request can be made from the master station.

[Embodiments of the invention]

FIG. 1 shows a remote control device 2 (15) according to the present invention.

2 is a block diagram showing an interface of the network control device 1. FIG.

Reference numeral 14 indicates a timer circuit provided in the switching control-r interface section 12 within the line coupling circuit 11.

The operation of the present invention will be explained with reference to the detailed operation time chart shown in FIG.

The originating side network controller and the terminating side network controller each turn on DSCI and CI according to the call response conditions, and turn on the C of the communication path.
Turn on ML. At this point, the line connection control circuit 14, which has been set in advance for the time necessary for data processing, is activated, and the line connection control turns off the CML and opens the public corporation line.

Other operations are basically the same as those described in the conventional example.

Reference numeral 13 indicates an automatic call interface section provided within the line coupling circuit 11.

〔Effect of the invention〕

According to the present invention, even if the line between the master station and the slave station in the data is connected and put-locked, the public corporation line can be opened after a certain period of time, and the line can be disconnected from the remote control device. Trouble such as loss of monitoring and control can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an interface according to an embodiment of the present invention, FIG. 2 is a system block diagram, FIG. 3 is a conventional interface block diagram, and FIG. 4 is an operation time chart. 9... Signal transmission section, 10... Transmission/reception processing section, 11.
...Line coupling circuit, 12...Switching control interface section, 13...Automatic call interface section, 14.
...Line connection control circuit. Agent: Patent Attorney Akio Ichitakahashi, 4th, Ogawa, 7th son, 2nd Ward, 3rd

Claims (1)

[Scope of Claims] 1. In a remote monitoring and control device using a public communication line network control device, the public line network control device is connected to a line coupling circuit for controlling the public line network control device provided in a device on the slave station side. A line connection control circuit is installed that detects the line connection status based on an incoming call detection signal from the device and a line connection command signal to the public line network control device, and releases the line after data transmission/reception is completed. A remote monitoring and control device characterized in that the slave station can open a line even if no command is received.