JP3162468B2 - Telephone device in remote monitoring control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method of connecting a monitoring station (hereinafter, referred to as a master station) and a monitored station (hereinafter, referred to as a slave station) by a communication line and connecting the master station and the slave station. Data transmission with
In addition, the present invention relates to a telephone device in a remote monitoring control device that connects a telephone to a master station and a slave station and performs a call via the communication line.

[0002]

2. Description of the Related Art FIG. 3 is a block diagram of a telephone device in such a remote monitoring control device. The master station 1 and the slave stations 2 are connected via a dedicated line L1. The master station 1 has a data processing unit 3 having a monitoring function and a communication function. Data such as control information to be transmitted from the data processing unit 3 to the slave station 2 is transmitted to a dedicated line L1 through a modem (MODEM) 4. Sending out.

The slave station 2 has a data processing unit 5 having a monitoring function and a communication function like the master station 1, and data such as control information to be transmitted from the data processing unit 5 to the master station 1. Through the modem 6 to the dedicated line L1. Thus, data transmission is performed between the master station 1 and the slave station 2.

On the other hand, the master station 1 and the slave station 2 are provided with telephone devices. That is, telephones (TEL) 7 and 8 are connected to the master station 1 and the slave station 2. The master station 1 is provided with a telephone interface 9, to which a tone transmitting circuit 10, a tone detecting circuit 11, and a low-pass filter (LPF) 12 are connected.
The tone transmitting circuit 10 generates a tone signal of a predetermined frequency for calling a telephone call.
Is for detecting an incoming tone signal. The low-pass filter 12 is for extracting a communication transmission band, and a dedicated line L1 is connected to the low-pass filter 12.

[0005] Similarly, the slave station also has a telephone interface 1.
The telephone interface 13 is connected to a tone transmitting circuit 14, a tone detecting circuit 15, and a low-pass filter 16.

The transmission band for data transmission by the remote monitoring control device and the communication band by the telephone device use different transmission bands, respectively, and are transmitted through the same dedicated line L1.

Each of the telephones 7 and 8 is a special telephone specially prepared to be provided in the remote monitoring control device. As shown in FIG.
7, a buzzer 18, a transmitter 19, and a receiver 20. The call button 17 and the like are connected to the telephone interfaces 9 and 13.

In such a configuration, when a telephone call is made from the telephone 7 of the master station 1 to the telephone 8 of the slave station 2, the telephone call push button switch 17 is operated on the telephone 7 of the master station 1. With this operation, the telephone call signal of the telephone 7 is converted into a tone signal by the tone transmission circuit 10 and transmitted to the dedicated line L1.

In the slave station 2, when a tone signal is detected by the tone detection circuit 15, a ringer signal is generated and the telephone 8
Buzzer 18 is sounded. Conversely, a telephone call from the telephone 8 of the slave station 2 to the telephone 7 of the master station 1 is performed in a similar manner.

The telephones 7 and 8 are provided with the telephone call push button switches 17 and the like as described above. Two lines for the call push button switch 17, two lines for the buzzer 18, and three lines for the transmitter 19 and the receiver 20
A book is used. Therefore, the telephones 7 and 8 and the telephone interfaces 9 and 13 must be connected by a cable or the like composed of at least seven electric wires.

In addition, when a telephone call is made from the telephone 7 or 8, the telephone call push button switch 17 must be operated each time, and the operation is troublesome, unlike a telephone connected to a public telephone line. .

[0012]

As described above, a cable (multi-core cable) composed of at least seven electric wires is provided between the telephones 7 and 8 and the telephone interfaces 9 and 13.
Therefore, the telephones 7 and 8 cannot be freely installed at desired locations away from the master station 1 and the slave station 2. Also, unlike the telephone connected to the public telephone line due to the operation of the telephone call push button switch 17, the operation is troublesome.

Accordingly, the present invention provides a telephone which can be installed at a desired place by reducing the number of electric wires connecting the telephone and the remote monitoring control device, and which improves the operability of the telephone and which is connected to a public telephone line. It is an object of the present invention to provide a telephone device in a remote monitoring control device which can be equivalent to the above.

[0014]

According to the present invention, data is transmitted between a monitoring station and a monitored station via a communication line, and each telephone is connected to the monitoring station and the monitored station via a communication line. In the telephone device in the remote monitoring control device that performs a telephone call, the monitoring station and the monitored station

[0015] receives a signal via a two-wire connecting line from the telephone set, and 2-wire 4-wire switching circuit for sending a signal via a two-wire connection line to the phone, the phone call signal corresponding to the dial by phone, 2 A first communication means which receives the signal via a line connection line and a two-wire / four-wire switching circuit, converts the first pulse signal into a first pulse signal based on a tone signal of a predetermined frequency, and sends the first pulse signal to the communication line at regular intervals; Link generated by receiving a signal
When a telephone signal is sent to the telephone and the telephone goes off-hook, a second pulse signal based on a tone signal is sent to the communication line, and the second communication means for connecting the telephone and the communication line, and the second pulse signal is detected. And a third communication means for connecting a telephone and a communication line, and is a telephone device in a remote monitoring and control apparatus which achieves the above object.

[0016]

By providing such means, two lines and four lines
The switching circuit is an electric wire connecting the telephone and the remote monitoring control device
Reduce the number. Further, when the telephone is dialed by the telephone at the monitoring station, the first telephone means converts the telephone call signal corresponding to the dial into a first pulse signal of a tone signal of a predetermined frequency and sends it to the monitored station at regular intervals . Monitored station side 2
The communication means detects the first pulse signal from the monitoring station and is constant
Generate lingers at intervals . When the telephone goes off-hook in this state, the second pulse signal based on the tone signal is sent to the monitoring station via the communication line, and the telephone is connected to the communication line. Upon detecting the second pulse signal from the monitored station, the third communication means on the monitoring station connects the telephone with the communication line, and sets the telephones on the monitoring station and the monitored station to a communication enabled state. I do.

[0017]

An embodiment of the present invention will be described below with reference to the drawings. The same parts as those in FIG. 3 are denoted by the same reference numerals, and detailed description thereof will be omitted. FIG. 1 is a configuration diagram of a telephone device in the remote monitoring control device. The master station 100 and the slave station 200 are provided with a telephone interface.

That is, the modem 4 of the master station 100 has the first
Two wires 4 separated into feed and receive via switch 30
The line switching unit 40 is connected, and the dedicated line L1 is connected to the two-line four-line switching unit 40.

On the other hand, the telephone 7 is connected to a two-wire / four-wire switching unit 50. The two-wire / four-wire switching unit 50 separates an audio signal into a transmission signal and a reception signal.
It is connected to the two-wire / four-wire switching unit 40 via the first and second switches 32 and the first switch 30. Further, a power supply 34 is connected to the telephone 7 via a constant current circuit 33. The call control unit 60 is connected to the constant current circuit 33.
A value of 0 controls the opening and closing of the first switch 30 and the second switch 35.

An oscillator (OSC) 36 for generating a tone signal having a frequency of 500 Hz is connected to the first switch 30 and the two-wire / four-wire switching unit 40 via the second switch 35. . Tone detection circuit 37
Is connected to a two-wire / four-wire switching unit 40 via a second switch 35, and a tone detection signal is sent to a call control unit 60. On the other hand, the child station 200 is
The same components are denoted by the same reference numerals, and detailed description thereof will be omitted.

Specifically, the master station 100 and the slave station 200 are shown in FIG.
The configuration is as shown in FIG. The two-wire / four-wire switching unit 40 includes a transformer 41 connected to the dedicated line L1, and a two-wire / four-wire switching circuit (H) 42 is connected to the transformer 41. An amplifier 43 is connected to one terminal of the 2-wire 4-wire switching circuit 42.
And a band reject filter 44 and a band pass filter 45 are connected to each other. The band reject filter 44 has a function of removing a tone signal having a frequency of 500 Hz.
It has a function of passing a 00 Hz tone signal.
The output terminal of the band reject filter 44 is connected to the respective contacts 30a and 30b of the first switch 30.

Each contact 30c, 3c of the first switch 30
0d through a band reject filter 46 and an amplifier 47 for removing a tone signal having a frequency of 500 Hz.
The line 4-wire switching circuit 42 is connected to another terminal.

The 2-wire 4-wire switching section 50 includes a transformer 51
And a two-wire / four-wire switching circuit 52, of which low-pass filters 31, 32 are connected to respective terminals of the two-wire / four-wire switching circuit 52.
Is connected. The input terminal of the low-pass filter 31 is connected to the contact 30b of the first switch 30,
The output terminal of the low-pass filter 32 is connected to the first switch 30.
Is connected to the contact 30d. The constant current circuit 33 is connected to a power supply 34 via a DC / DC converter 34a.

The call controller 60 has the following configuration. Hook detection circuit 61 for constant current circuit 33
Is connected to an output terminal of the hook detection circuit 61 via a pulse dial detection circuit 62.
3 are connected. A calling pulse generating circuit 63 is connected to an output terminal of the low-pass filter 32 via a DTMF detecting circuit 64.

The telephones 7 and 8 include a pulse type and a touch-tone type. The pulse dial detection circuit 62 and the DTMF detection circuit 64 detect the dial numbers of these telephones. That is, in the pulse type telephone, the dial signal has a pulse in which the current flows, so that the hook detection circuit 61 detects the pulse signal and the pulse dial detection circuit 62 detects the dial number. In a push-tone telephone, a dial number is detected by a DTMF detection circuit 64 in response to a signal from the low-pass filter 32.

The calling pulse generating circuit 63 has a function of generating a call calling pulse to the second switch 35 upon receiving a dial detection signal from the pulse dial detecting circuit 62 or the DTMF detecting circuit 64. In this case, the call call pulse is repeatedly transmitted at a high level for one second and at a low level for two seconds.
a is to be closed. At this time, the contact 35b is controlled to be open.

The call pulse generating circuit 63 closes the contact 35a when receiving the hook detection signal from the hook detection circuit 61 after receiving the dial detection signal from the pulse dial detection circuit 62 or the DTMF detection circuit 64. It has a function of sending a high-level pulse to the second switch 35.

The oscillator 36 is connected to the contact 35a of the second switch 35, and the oscillator 36 and the amplifier 47 are connected by closing the contact 35a.

The band-pass filter 45 and the tone detection circuit 37 are connected via the contact 35b of the second switch 35, and the tone detection signal of the tone detection circuit 37 is sent to the ringer generation circuit 65. When receiving the tone detection signal, the ringer generation circuit 65 sends the ringer signal to the telephones 7 and 8 to ring the bell, and the hook detection circuit 61
It has a function to stop the ringing of the bell in response to an off-hook signal from. The incoming pulse detection circuit 66 has a function of transmitting an incoming call detection signal to the call switching circuit 67 when receiving the tone detection signal from the tone detection circuit 37.

The call switching circuit 67 has a function of controlling the opening and closing of the first switch 30 and the second switch 35. When a call detection signal from the incoming pulse detection circuit 66 is received, the call switch circuit 67 switches the second switch 35. A switch signal for opening the contact 35a is sent, a switch signal for closing the contacts 30b, 30d of the first switch 30 is sent, and when an off-hook detection signal is received from the hook detection circuit 61, the contacts 30b, 30d are turned off. It has a function of sending a close switching signal. Next, the operation of the apparatus configured as described above will be described. (1) When the receiver of the telephone 7 of the master station 100 is picked up, the current flowing through the telephone 7 changes, and the off-hook state of the telephone 7 is detected by the hook detection circuit 61.

In this state, the dial tone requesting the dial from the call switching circuit 67 is converted to a two-wire / four-wire conversion circuit 52,
The dial tone is transmitted to the telephone 7 via the transformer 51, and the dial tone is stopped when the designated number is dialed.

When a designated number is dialed, the dial signal becomes a pulse of the current flow, the hook detection circuit 61 detects this pulse, and the pulse dial detection circuit 62 receives this pulse to detect the dial number. I do. The pulse dial detection circuit 62 detects a dial number and sends a dial detection signal to the calling pulse generation circuit 63.

The calling pulse generating circuit 63 receives the dial detection signal and generates a call ringing pulse which is repeated at a high level for 1 second and a low level for 2 seconds to the second switch 35. The contact 35 of the second switch 35
a closes during the high level period of the call ringing pulse. The contact 35b is controlled to be open.

Thus, the frequency 50 of the oscillator 36
The 0 Hz tone signal is transmitted to the first signal corresponding to opening and closing of the contact 35a.
The signal is converted into a pulse signal, and transmitted to the dedicated line L1 through the amplifier 47, the two-wire / four-wire conversion circuit 42, and the transformer 41. This call calling state continues until the handset of the telephone 7 is put on-hook and the slave station 200 responds to the call.

(2) On the other hand, in the slave station 200, the second switch 35 is in a state where the contact 35a is open and the contact 35b is closed. When the tone signal converted into the first pulse signal arrives in this state, this tone signal is
A tone detection circuit 37 through a 1, 2-wire 4-wire conversion circuit 42, an amplifier 43, a band-pass filter 45, and a contact 35b.
To enter.

When detecting the tone signal, the tone detection circuit 37 sends the tone detection signal to the ringer generation circuit 65. The ringer generation circuit 65 generates a ringer signal in response to the tone detection signal. This ringer signal is sent to the telephone 8 through the constant current circuit 33. Thereby, the bell of the telephone 8 rings. In this case, the bell rings 1
It beeps for 2 seconds and stops for 2 seconds.

In this state, when the receiver of the telephone set 8 is taken off-hook, the hook detection circuit 61 detects this and outputs an off-hook detection signal to the ringer generation circuit 65, the calling pulse generation circuit 63, and the call switching circuit 67. To send to. The ringer generation circuit 65 stops generating the ringer signal in response to the off-hook detection signal, whereby the ringing of the bell of the telephone 8 is stopped.

At the same time, the calling pulse generating circuit 63
Upon receiving the off-hook detection signal, the second switch 35
A high-level pulse signal for closing the contact 35a is transmitted. Thereby, the contact 35a is closed and the frequency is 500H.
The z tone signal is transmitted to the dedicated line L1 as a hook state signal (second pulse signal).

Thereafter, the communication switching circuit 67 outputs a switching signal for opening the contact 35a of the second switch 35 after 2 seconds.
The switching signal is sent to the switch 35 and the switching signal for closing the contacts 30b and 30d of the first switch 30 is sent. Thus, a tone signal having a frequency of 500 Hz is transmitted to the dedicated line L1 for only 3 seconds. The telephone 8 of the slave station 200 is connected to the dedicated line L1 via the first switch 30 and the like.

(3) Again, in the master station 100, the slave station 200
, A tone signal as a hook state signal from the receiver is received, the tone signal is transmitted to a transformer 41, a two-wire / four-wire conversion circuit 42, an amplifier 43, a band-pass filter 45, and a contact 3
The signal is input to the tone detection circuit 37 through 5b.

When the tone detection circuit 37 detects a tone signal as a hook state signal, it determines that a tone signal has arrived at the slave station 200, and sends the termination detection signal to the incoming call pulse generation circuit 66. When receiving the incoming call detection signal, the incoming pulse generating circuit 66 sends a switching signal to the first switch 30 to close the contacts 30b and 30d. Thus, the telephone 7 of the master station 100 is connected to the dedicated line L1 via the first switch 30 and the like.

Thus, the telephone 7 on the master station 100 side and the telephone 8 on the slave station 200 side are in a call-enabled state. And
When the telephone call ends and the handsets of the telephones 7 and 8 are put into the on-hook state, the on-hook state is detected by the hook detection circuit 61, and the switches 30 and 35 return to the initial connection state.

As described above, in the above embodiment, the telephone call signal corresponding to the dialing by the telephone 7 of the master station 100 is converted into the first pulse signal of the tone signal, and
0, the slave station 200 detects the first pulse signal from the master station 100, generates a ringer signal and rings the bell, and in this state, the second pulse signal based on the tone signal is transmitted by the off-hook state of the telephone 8 to the master. The telephone station 8 is sent to the station 100 to connect the telephone 8 to the dedicated line L1, and the master station 100 detects the second pulse signal to connect the telephone 7 to the dedicated line L1. The connection between the telephone 200 and the telephones 7 and 8 can be made by two wires. As a result, the installation location of each of the telephones 7 and 8 is the master station 1
It can be freely installed at any place, not only in the vicinity of the slave station 200 and the slave station 200, and the wiring facility cost can be reduced.

Further, since the telephones 7 and 8 can use telephones connected to a public telephone line, the telephones 7 and 8 having a desired design can be selected, and the telephones of high quality at a lower price as compared with the dedicated telephones. Can be selected.

Further, since the tone signal having the frequency of 500 Hz is used as each signal indicating the call calling state and the hook state, it can be constituted by one kind of oscillator 36, band-pass filter 45 and tone detecting circuit 37. Further, the band reject filter 44 for removing the frequency component of the tone signal from the data signal and the call signal of the remote monitoring control device can be constituted by one type. Since the band reject filter 44 is connected, the caller does not feel uncomfortable even if a call signal and a tone signal as a hook state signal are transmitted during a call.

It should be noted that the present invention is not limited to the above-described embodiment, but may be modified within the scope of the invention. For example, when the band of the data signal of the remote monitoring control device is separated from the band of the call signal, the first switch 3
0, the respective contacts 30a and 30c are closed, and if the respective bands are not separated, the respective contacts 30 of the first switch 30
a, 30c are in an open state.

[0047]

As described above in detail, according to the present invention, the number of electric wires connecting the telephone and the remote monitoring control device can be reduced so that the telephone can be installed at a desired place and the operability of the telephone can be improved. Thus, a telephone device in a remote monitoring control device which can be equivalent to a telephone connected to a public telephone line can be provided.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing one embodiment of a telephone device in a remote monitoring control device according to the present invention.

FIG. 2 is a specific configuration diagram of the device.

FIG. 3 is a configuration diagram of a conventional device.

FIG. 4 is an exemplary view showing connection lines of a telephone provided in the apparatus.

[Explanation of symbols]

100: master station, 200: slave station, 3, 5: data processing section,
4, 6 modem, 7, 8 telephone, 30 first switch, 31, 32 low-pass filter, 33 constant current circuit, 35 second switch, 36 oscillator, 37 tone detection circuit, 60 telephone conversation Control unit, 61: hook detection circuit, 62: pulse dial detection circuit, 63: calling pulse generation circuit, 64: DTMF detection circuit, 65: ringer generation circuit, 66: incoming pulse detection circuit, 67: call switching circuit.

Claims (1)

(57) [Claims] Make a call via the perform data transmission, and connect each phone in the monitoring station and the monitored station said communication line via a 1. A communication link with the monitoring station and the monitored station In the telephone device in the remote monitoring control device, a signal for receiving a signal from the telephone via the two-wire connection line to the monitoring station and the monitored station, and transmitting a signal to the telephone via the two-wire connection line. Line 4
A line switching circuit, a phone call signal corresponding to the dial by the telephone, before
First communication means which receives the signal via the two-wire connection line and the two-wire four-wire switching circuit, converts the first pulse signal into a first pulse signal based on a tone signal having a predetermined frequency, and sends the first pulse signal to the communication line at a constant interval; Link generated by receiving the first pulse signal
Sending a second signal to the communication line, sending a second pulse signal based on the tone signal to the communication line, and connecting the telephone line with the communication line when the telephone goes off-hook; And a third communication means for connecting the telephone and the communication line when a two-pulse signal is detected.