JPH0834525B2 - Call control device for remote monitoring and control system - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a call control device of a distant monitoring control system, and particularly to call control suitable for a system in which a dedicated line or a private line and a public line are mixedly used for a transmission line. Regarding the device.

[Background of the Invention]

In the remote monitoring and control device, one of a dedicated line, a private line, and a public telephone line (hereinafter simply referred to as a public line) has been used as a line in the past, but in order to reduce the cost of the line, There is an increasing number of methods to use different lines depending on the amount of data to be handled. That is, a private line or a private line is used to connect a slave station having a large amount of data and a master station, and a public line is used between the slave station having a small amount of data and the master station.
On the other hand, it is necessary to call between the master station and the slave station of the distant monitoring controller for data transfer as well as for meetings, etc., and the conventional master station including the call system when using the above-mentioned multiple system lines is It was constructed as shown in FIG. The operation of this conventional system will be described below.

In FIG. 3, the transmitting / receiving unit 1 performs serial / parallel conversion and parallel / serial conversion of data so that data to be transmitted / received is parallel on the device side and serial on the line side. The transmission data from the transmission / reception unit 1 is modulated by an FS (frequency shift) modulator 2 and sent to the hybrid transformers 4 to 6, and the reception data from these transformers 4 to 6 is demodulated by the FS demodulator 3 to be transmitted / received by the transceiver 1 Is input to. The switches 7 and 8 are controlled by the call switch 14, and are connected to the contacts 7a and 8a when transmitting / receiving data. The switch 12 is a station selection switch that turns on the switch 10 or 11 when communicating with a slave station connected to the leased line 100 or the private line 101, and the switch 13 is used when talking to a slave station connected to the public line 102. This is the station selection switch. The input / output unit 15 is an input / output circuit for the switches 12 to 14 including a relay, a photocoupler, a driver, and the like. The network control unit (hereinafter abbreviated as NCU) 19 and its control unit 16 are switches 1
The connection control with the public network when the public line 102 is selected by 3 is performed, and the telephone 33 is used for the call with the slave station connected with the public line 102. On the other hand, when talking with a slave station connected by the private line 100 or private line 101, the handset 25 and the intercom circuit 1
7, using the tone generator 18.

In the above configuration, a case of transmitting / receiving with a slave station connected to the private line 100 (or private line 101) will be described first.
At this time, the station selection switch 12 is operated to turn on the switch 10 (or 11). Further, when the transmission / reception is data, the call switch 14 is kept off, whereby the switches 7 and 8 are connected to the contacts 7a and 8a. Therefore, the data transmitter / receiver includes a transmitter / receiver 1, an FS modulator 2, and a hybrid transformer 4.
(Or 5), switch 7 (or 8), switch 10
(Or 11) sent via switch 10 when receiving data
(Or 11), switch 7 (or 8), hybrid transformer 4 (or 5), FS demodulator 3, and transmitter / receiver 1. When making a call, the call switch 14 is turned on to connect the switches 7 and 8 to the contacts 7b and 8b. As a result, the dedicated line 100 (or private line 101) is switched 10 (or
11), connected to the intercom section of switch 36 or lower via switch 7 (or 8). In this part, at the beginning of a call, the manual switch 35 is manually turned on to output a ring tone from the tone generator 18, and the manual switch 36
Is connected to the contact 36b side to send this ringing tone to the slave station side. When the other party responds, switch 35 is turned off, switch 36 is contact 36
It is manually returned to the a side, and a call is made using the handset 25 via the intercom circuit 17. The above-mentioned procedure for making a call on the private line or private line is shown in FIG. 4 (a).

Next, in the case of transmission / reception with a slave station connected to the public line 102, control by the NCU 19 shown in FIG. 5 is performed. That is, when the public line 102 is used, it goes through an exchange such as a telephone station, so that the slave station is not connected except when transmitting and receiving. Therefore, it is possible to economically use the line in the case of a slave station that handles a small amount of data. To connect the slave station via the public line 102, first one of the station selection switches 13 is turned on. Then NCU
The control unit 16 sends dial number information for calling the slave station selected by the switch 13 to the NCU 19. In the NCU 19 of FIG. 5, the control unit 26 receives this dialed number information and outputs a dial signal corresponding to the information from the dial signal generator 27. At the same time, the control unit 26 connects the switch 30 to the contact 30a side and the switch 29 to the contact 29b side, and the hatched circuit operates as shown in FIG.
Sent to 102. After this transmission, switch 30 contacts 30b.
Is switched to the side. When the exchange of the public network (not shown) is activated by calling the dial signal to call the slave station, and the slave station responds with an off-hook response, this is detected by the response detection circuit 32 (state of FIG. 6 (b)). , Contact the control unit 26.
According to this communication, the control unit 26 switches the switch 29 to the contact 29a side (FIG. 6 (c)), connects the public line 102 to the transmission / reception unit 1 via the hybrid transformer 6, and the child connected by the public line 102. In this state, when communicating with the slave station via the public line 102, the manual switch 31 of the NCU 19 is manually switched to the R side in Fig. 5. Then, the reception detection circuit 28 The changeover is notified to the control unit 26, and the control unit 26 changes over the switch 29 to the contact 29b side to bring about the state of Fig. 7. That is, since the telephone set 33 is connected to the currently selected slave station via the public line, All that is necessary is to dial the telephone set 33 to call the telephone set in the slave station, and the call procedure at this time is shown in Fig. 4 (b), where the call signal is transmitted from the slave station connected by the public line 102. When this occurs, the reception detection circuit 28 informs the control unit that detected this. Since it is made to be a display operator by a means not shown, a response is made in the same manner as in Fig. 4 (b) When the call is completed, the switch 31 is always returned to the L side to prepare for data transmission / reception.

As described above in detail, conventionally, it is necessary to perform an intercom operation when talking to a slave station using a private line or a private line, and a switch operation of the NCU when talking to a slave station using a public line. It was These were the result of the combination of the devices in the case of a system using only a private line or private line, or a system using only a public line, and there was no problem in the case of either one alone. However, in the system as shown in FIG. 3 in which these are mixed, the operator has to make a call operation after identifying which line is used for the slave station, which is a burden on the operator. In addition, there is an inconvenience that the master station is provided with both a handset for intercom and a telephone for public network subscribers.

[Object of the Invention]

The object of the present invention is to use the same procedure in a remote monitoring system having a transmission line for both a private line or a private line and a public line without the operator being aware of the type of transmission line connected to the slave station. An object of the present invention is to provide a call control device capable of operating a call connection.

[Outline of Invention]

The present invention provides a switch between the NCU data input / output terminal and the hybrid transformer, and when the communication switch for the intercom is turned on, the intercom circuit is connected to the data input / output terminal of the NCU instead of the data transmitting / receiving section. The feature is that even when using a public line, a call can be made by the same call switch operation as in the case of a private line or a private line.

Example of Invention

The present invention will be described below with reference to the embodiment shown in FIG. The embodiment shown in FIG. 3 is different from the conventional type shown in FIG. 3 in that the switch 9 is inserted between the hybrid transformer 6 and the terminal A of the NCU 19, and the intercom circuit 200 is connected to the contact 9b side of the switch 9. The telephone 33 at the terminal D of the NCU 19 has been removed, and therefore the switch 31 of the NCU 19 in FIG. 5 is fixed to the L side (or, except for this, it is replaced with this connecting line).
Timer device for automation of tone transmission 21
Everything else is exactly the same, except that 0 is provided. The switches 22 and 23 of the timer device 210, when the dedicated line 100 or the private line 101 is selected by the station selection switch 12,
A switch that turns on switches 10 and 11 in exactly the same way,
The switch 34 is turned on when the call switch 14 is on. Switches 241 and 242 in the intercom apparatus 200 are contacts of the timer 24.

The outline of the operation of this embodiment is shown in FIG. First, when any of the station selection switches 12 is turned on, the dedicated line
Either the switch 100 or the switch 10 or 11 of the private line 101 is turned on to close the line. Also, when a public line is selected by the station selection switch 13, dialed number information is given to the NCU 19 according to the switch information input to the NCU control unit 16. The NCU 19 performs the above-mentioned circuit closing procedure based on the dialed digit information. The above is exactly the same as the conventional example, and data can be transmitted / received unless the call switch 14 is turned on in the state where one of the lines is closed. When the call switch 14 is turned on in this state, the transceiver 1 has been connected to the dedicated line 10
0, private line 102, or public line 102 is switched to the intercom side. At the same time, when the dedicated line 100 or the private line 101 is selected, the switch 22 or 23 is turned on, and the switch 34
Since the call switch 14 is turned on when the call switch 14 is turned on, the timer 24 operates. This turns on the timer contact 24 and activates the tone generator 18. Further, the timer contact 242 is switched to the lower side and the calling tone signal is sent to the private line 100 or the private line 101 via the switch 7 or 8. Since the timer 24 automatically stops its operation when the set time elapses, the tone signal transmission also stops after the timer set time elapses, the switch 242 is switched to the upper side, and the telephone call by the handset 25 becomes possible. When the public line 102 is selected, pressing the call switch 14
Since the intercom device 200 is connected to the intercom device 200 via the NCU 19 and the switch 9, the handset 2 of the intercom device 200
It is possible to use 5 to talk to the slave station to which the public line 102 is connected. In this way, the operator's operating procedure can be exactly the same no matter which line is used, and the tone signal can be sent out automatically, so that the burden on the operator during a call can be greatly reduced. Further, the externally mounted telephone 33 is also unnecessary.

In the above embodiment, the leased line and the private line are each one line, but it is clear that either one of them may be used and the number of lines may not be one.

〔The invention's effect〕

According to the present invention, in a distant monitoring control system in which a dedicated line, a private line, and a public line are mixedly connected to a transmission line,
It is said that the operator can always talk by the same operation procedure without being aware of the type of communication line at the time of a call, which reduces the burden on the operator and enables the construction of a system equipped with a rational man-machine device. Is effective,
In addition, there is no need for a telephone that is externally connected to the NCU, which has the effect of reducing the mounting space.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a flow chart showing the operation of the embodiment of FIG. 1, FIG. 3 is a block diagram of a system showing a conventional call control method, and FIG. FIG. 5 is a flow chart showing the operation of the system of FIG. 3, FIG. 5 is a circuit diagram of the NCU, and FIGS. 6 and 7 are diagrams showing the operating state of the NCU. 1 ... Transceiver, 4-6 ... Hybrid transformer, 7-
9 ... Switch, 12,13 ... Station selection switch, 14 ... Call switch, 16 ... NCU control unit, 17 ... Intercom circuit, 18 ... Tone generator, 19 ... NCU (network control unit), 22,23 ... Switch, 24 … Timer, 25… Handset, 34… Switch, 100
... leased line, 101 ... private line, 102 ... public line, 200 ... intercom device, 210 ... timer device, 241,242 ... switch.

Claims (1)

[Claims] 1. A master station for performing remote monitoring control, comprising a data transmitter / receiver and an intercom device for communication,
In a call control device of a distant monitoring control system comprising a plurality of first slave stations connected to the master station via a private line or a private line and a second slave station connected to the master station via a public telephone line The slave station selection switch provided for the slave station, the call switch, and the signal generating means are respectively connected to the corresponding first slave station by a dedicated line or a private line. When the slave station selected in step 1 is any of the first slave stations, line connecting means for closing only the private line or private line corresponding to the first slave station, and the slave station selected by the slave station selection switch Corresponding to each of the plurality of line connection means, and a network control means for sending a dial signal for connecting to the slave station to the public telephone line to close the public telephone line when the second slave station is The line connection means Connection switching means for connecting to the transmission / reception section and connection switching means for connecting the network control means to the data transmission / reception section, the connection switching means being connected to the transmission / reception section. The connection switching means is switched to connect the intercom device instead of the data transmission / reception unit, and the intercom device is connected via the corresponding connection switching means and line connection means, or the corresponding connection switching means and public telephone line. A call control device for a remote monitoring and control system, characterized in that a ringing tone is transmitted from the signal generating means to the slave station.