JPH071883Y2 - Transmission equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is adapted to be connectable to communication devices such as a telephone, a facsimile device, and a control device for a telemeter system, and one public communication line is connected with these communication devices. The present invention relates to a transmission device that selectively uses and performs transmission, and more particularly to a transmission device that enables calling of a communication device having a no-ringing automatic incoming call function even when the communication device is connected.

[Conventional technology and problems to be solved by the invention]

In a conventional transmission device, for example, an alarm device that transmits abnormality information to a control center via a telephone line which is a public communication line as used in a security system, one telephone line is used from the viewpoint of effective use of the telephone line. A configuration is adopted in which a plurality of communication devices are shared, and in particular, a communication device that receives a no ringing service, such as a facsimile device, may be provided among these communication devices. At this time, the ringing ringing signal sent to the facsimile machine is blocked by the photocoupler having a threshold value in the communication signal detection circuit provided in the alarm device, and as a result, the call to the facsimile machine is terminated, There was a problem that the facsimile machine could not be activated.

An alarm device, which is an example of a conventional transmission device, will be described in detail with reference to FIG.

FIG. 3 shows a case where a facsimile machine and a telephone are connected to such an alarm device.

Reference numeral 1a is a communication signal detection circuit for detecting that the telephone line is being called or that the telephone line is being used by a telephone or the like. If the facsimile machine does not receive the no ringing service, the call signal from the exchange (not shown) connected to the telephone lines L ₁ and L ₂ is 16 Hz, 80 Vp.
-P. The calling signal when the facsimile machine receives the no ringing service is 1300 Hz, 1 Vp-p.

2a is a security mode of a predetermined warning area in the alarm device,
That is, it is a mode setting means for setting "security start" and "security release". Reference numeral 3a is a sensing means which is arranged at a proper position in a predetermined warning area and detects an abnormality. Reference numeral 4a is a discrimination activation means for activating a call when the detection means 3a determines abnormality or normality and the mode setting means 2a determines the security mode. Reference numeral 5a is an identification means for identifying whether or not the telephone lines L ₁ and L ₂ are currently in use by the detection signal of the photocoupler provided in the communication signal detection circuit 1a. 6a
Is a line connecting means for dialing a predetermined telephone number, for example, a telephone number of a remote control center when the identifying means 5a identifies that the telephone line is not in use. Reference numeral 7a is a response means for transmitting an abnormal signal or a security mode signal after the control center and the alarm device are connected via the telephone lines L ₁ and L ₂ . Reference numeral 8a is a polarity reversal detection means for detecting the reversal of the polarity on the telephone line to determine whether or not the control center is connected. Note that 9a is a facsimile machine that receives a no-ringing service, and 10a is a telephone.

Now, when the alarm device does not require a call, that is, in a normal state, the closing relay A of the line connecting means 6a in the alarm device is inactive (deactivated), and the make contacts a ₁ and a ₂ are shown in the figure. It looks like a solid line. Here, when a third party requests the facsimile machine 9a to dial and dials, an exchange (not shown) sends a ringing signal of no ringing, that is, a calling signal of 1300 Hz, 1 Vp-p through the facsimile network. This no-ringing service call signal is input to LED1 and LED2 of the communication signal detection circuit 1a, but normally LED1 and LE
Since the threshold value of D2 is about 1.6V to 2.0V, this no ringing signal is cut off by LED1 and LED2. That is, the no-ringing call signal does not flow to the facsimile device 9a, and a facsimile device that receives a no-ringing service cannot be connected to such an alarm device. It should be noted that the photocoupler consisting of LED1, LED2 and two photodetectors, which are provided so as to operate for bipolar AC inputs, not only insulates the subsequent circuits and cuts noise, but also from the alarm device. It is provided to detect whether a facsimile or the like is in use when transmitting the abnormal information of 1. to the control center. The output of the photo detector is connected to the identifying means 5a.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to activate a communication device that selectively connects a public communication line together with a plurality of communication devices, even if the communication device connected to the transmission device is a communication device compatible with no ringing service. Another object is to provide a transmission device capable of applying a call.

[Means and Solutions for Solving the Problems]

According to the present invention, when the public communication line is connected to the first communication means that normally receives the no-ringing signal, and when the call to the outside using the second communication means is required, the first communication means is used. A transmission device for connecting the public communication line to the second communication unit temporarily or after a lapse of time after determining the communication state of the communication unit, wherein the public communication line is connected to the first communication unit. In a transmission device that determines the communication state of the first communication means based on a communication signal in the public communication line detected by a photocoupler provided in a communication path to reach, a photocoupler is bypassed in the communication path. A bypass path for the communication signal is provided, and in the bypass path,
The transmission is characterized in that an opening / closing means is provided which normally closes the bypass path and opens the bypass path when a call to the outside using the second communication means is required. A device is provided.

According to the above configuration, even when a communication device having a no ringing function is provided as the first communication means,
The no-ringing signal is normally sent through the closed bypass path, and thus is not blocked by the photocoupler.

〔Example〕

 The present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of a communication signal detection circuit provided in a transmission device according to the present invention. The communication signal detection circuit is indicated by reference numeral 10, and includes a photocoupler 11 and a contact b on a bypass path 12 that bypasses the photocoupler. In the figure, the contact b (switch) is normally closed (illustrated, solid line) and is opened when the alarm device described later requires a call. When the contact b is opened, it is possible to detect whether or not the telephone line is in use by the photocoupler 11 provided on the route bypassing the contact b (state shown by broken line in the figure). Reference numeral 11 is a photocoupler for detecting a communication signal flowing through the telephone line. Photocoupler 11 is LED1, LED of the opposite direction
2 and photo detectors PD1 and PD2 corresponding thereto. The pair of LED1, PD1 and LED2, PD2 is used because it is possible to detect a bipolar AC input. Here, when a call signal for the normal non-ringing service, that is, a call signal of 1300 Hz, 1 Vp-p arrives, the call signal is sent to the facsimile machine through the contact b.

FIG. 2 shows an alarm device, which is an example of a transmission device according to the present invention, and shows the configuration of a facsimile device that receives a no-ringing service and an alarm device that shares a telephone line with a telephone. ing.

In the figure, an alarm device is a mode setting means 20 for setting a security mode, and a sensing means for detecting an abnormality such as a fire or an intrusion.
30, a determination unit 41 that performs abnormality detection determination or mode setting change determination based on the signal of the sensing unit 30 or the security mode setting unit 20, and start switch circuits 42 and 43 and OR gates that send a determination signal and a start signal Judgment starting means 4 consisting of G ₁
0, whether the telephone lines L ₁ and L ₂ are currently in use (including ringing and busy) are discriminated by a signal detected by the photocoupler of the communication signal detection circuit 10 and a start signal is transmitted. If the telephone lines L ₁ and L ₂ are in use, the identification means 50, the priority means 55 that determines whether to send a signal preferentially or wait, and the communication signal detection circuit 10 based on the abnormal signal from the sensing means 30. Circuit use detecting means including means 59 for driving contact b of
58, telephone line based on the activation signal from the identification means 50
It is set by line switching means 60 having automatic calling means for calling the control center by forcibly opening L ₁ and L ₂ and sending a dial pulse signal to the control center, and switching operation device 21 in mode setting means 20. A response means 70 for encoding and transmitting the security mode to the control center and a polarity reversal detection means 80 for detecting the direction of the current, that is, the reversal of the polarity by off-hook and transmitting the reversal signal are provided. still,
For this alarm device, a facsimile device 90 having a no-ringing function, a multi-function telephone 100 having a hold button, and a communication device (not shown) for transmitting the meter reading value of the meter reading system are selected on the same telephone line as the alarm device. Connected.

Determination start means 40, identification means 50, priority means in this embodiment
55 may be configured using a microprocessor, or may be other means as appropriate.

The mode setting means 20 is, for example, a switching operation device 21 in which switching of security start or security release is performed by inserting and removing a predetermined card possessed by the subscriber, and security state setting for reading the information and setting the security state. And a circuit 22. The sensing means 30 includes various abnormality detectors 31a to 31n for detecting fire, intrusion, etc. by using ultrasonic waves, infrared rays, reed switches, micro switches or the like.
And detection circuits 32a to 32n for detecting an abnormality sensor signal of a predetermined level or higher and transmitting the signal.

The communication signal detection circuit 10 in this alarm device will be described in detail together with the operation of the alarm device.

When a predetermined card possessed by the subscriber is inserted into or removed from the switching operation device 21 of the mode setting means 20, the security status setting circuit 22 reads this card content, and a signal indicating the card content is determined by the determination activation means 40. Part 41 and first start switch
It is sent to the telephone line through the 42, the priority means 55, and the line opening means 60, and sent to the control center (not shown). As a result, the control center knows that the place where the alarm device is attached has started security. Similarly, in the case of releasing the security, the control center knows from the signal transmitted by inserting or removing the card in the mode setting means 20 that the installation location is being released. However, in the case of a fire and an emergency call, the judgment unit 41 of the judgment activation means 40 even if the security is released.
Is activated to notify the control center of abnormalities. Further, in the determination unit 41, when the intrusion detection detector detects an intrusion during the security release by the signal from the mode setting means 20, the activation signal is not output to the first activation switch 42. .

First, the operation when some abnormal situation occurs when the telephone line is not used will be described.

For example, the abnormality detectors 31a to 3 of the detecting means 30 for detecting intrusion
If an abnormality is detected in any of 1n, a signal is sent to the determination activation means 40 to determine whether the alarm device is currently being guarded or unguarded, and if it is being guarded, the first activation is performed. A high level signal from the switch 42 is sent to one input of each of the AND gates G ₂ and G ₃ in the identification means 50 via the OR gate G ₁ and drives the contact b of the communication signal detection circuit 10. It is also sent to the drive circuit 59. This allows the drive circuit
Reference numeral 59 turns on the relay B to open the contact b in the communication signal detection circuit (indicated by the broken line). Telephone line at this time
Since L ₁ and L ₂ are not used, contacts a ₁ , a ₂ and d
s and di are in the state of the solid line in the figure, and the communication signal detection circuit
A high-level signal is output from the photocoupler 11 consisting of 10 LEDs 1 and 2 and the corresponding photodiodes as the identification means 50.
Is input to the determination circuit 52. As a result, the output of the discrimination circuit 52 also becomes high level. Therefore, the two inputs of the AND gate G ₃ both become high level and the output also becomes high level, but since the inverter 51 is inserted between the AND gate G ₂ and the output of the discrimination circuit 52, The output goes low.

The high level output of the AND gate G ₃ activates the dial pulse generating circuit 61 of the circuit opening means 60, activates the circuit closing relay A, the dial pulse relay DI, and the shunt relay DS, and the contact a of the relay A ₁ , a ₂ , the contact di of the relay DI, and the contact ds of the relay DS are closed as shown by the broken line in the figure, and a DC closed loop L ₁ −a ₁ −di−ds−a ₂ −L ₂ is formed. . These relay contacts a ₁ , a ₂ , di, ds are contacts that close when the relay is turned on. Thus, a direct current closed loop is formed when the alarm device sends information. After that,
A predetermined dial pulse signal (for example, a telephone number of the control center) stored in advance in the dial pulse generation circuit 61 turns on / off the contact di of the dial pulse relay DI, so that the control center is passed through the DC closed loop. Dialed. When the control center responds to the dial pulse signal, the polarity reversal detection circuit 80 is activated, and the relay C is operated via the information signal selection switch circuit 71.
Is driven to switch the contact c of the reversing relay C as shown by the broken line in the figure. At the same time, the information signal selection switch circuit 71 of the response means 70 operates and is stored in advance in the signal generation circuit 72, and various coded abnormalities are generated by the combination of signals corresponding to the types of abnormalities of the abnormality detector. Information is telephone line
It is sent to the control center via L ₁ and L ₂ . This allows the control center to know the type of abnormality that has occurred. Then, the contact c of the reversing relay C is restored as shown by the solid line in the figure, and the DC closed loop is opened.

Next, an operation in which the alarm device transmits an abnormal signal to the control center when any abnormal situation occurs while the telephone lines L ₁ and L ₂ are being used will be described.

When the abnormality detector of the sensing means 30 senses an abnormality as described above, the determination activation means 40 sends a high-level activation signal to the identification means 50, while the drive circuit 59 is driven, so the relay B is turned on. To do. As a result, the contact b of the communication signal detection circuit is opened as shown by the broken line in the figure. Since the telephone line is currently in use as described above, a low level signal is sent from the photocoupler 11 to the discriminating circuit 52 of the discriminating means 50. The output of the discrimination circuit 52 becomes low level,
Since 51 is inserted, both the two inputs of the AND gate G ₂ become high level, and the output thereof becomes high level. The two inputs of one AND gate G ₃ are low level and high level, respectively, and its output is low level. And AN
The high level output of D gate G ₂ causes one input of AND gates G ₄ and G ₅ in priority means 55 to be high level. Here, the call signal of the alarm device is based on the signal from the sensing means 30, and only the AND gate G ₄ outputs a high level.
As a result, the timer 62 of the line opening means 60 is activated, and at the same time, the line closing relay A is activated. The timer 62 is for stopping the operation of the dial pulse relay DI for a fixed time, for example, 3 seconds or more, and the busy state is formed by turning off the relay DI and turning on the relay A for a fixed time. In addition, the dial pulse relay DI and the shunt relay DS are set to turn on after the operation of the timer 62 ends, and after this time elapses, the DC closed loop L ₁ −
A contact a ₁ -contact di-contact ds-contact a ₂ -L ₂ is formed, and a dial pulse signal is sent to the control center by turning on / off the contact di of the relay DI. The subsequent operation is the same as that described above.

Next, the operation when the security start mode is set in the alarm device when the telephone lines L ₁ and L ₂ are also used will be described.

As described above, when the start of the security mode is set by the switching operator 21 of the mode setting means 20, the security state setting circuit 22
Then, a signal is sent to the determination starting means 40. The determination unit 41 determines whether or not all of the sensing means 30 are in the security system, and if the security system is not in place, the intrusion sensor may be turned off due to, for example, opening a door or opening a window. In such a case, a display device (not shown) displays that fact. On the other hand, a signal is sent from the mode setting means 20 to the second start switch 43, and the drive circuit 59 is driven via the OR gate G ₁ . As a result, the relay B is driven and the contact b of the communication signal detection circuit 10 is opened as shown by the broken line in the figure. As a result, a low level signal is sent from the photocoupler 11 to the discrimination circuit 52 of the discrimination means 50. The output of the discriminating circuit 52 is at a low level, but since the inverter 51 is inserted as described above, the two inputs of the AND gate G ₂ are both at a high level, and the output thereof is also at a high level. On the other hand, the two inputs of the AND gate G ₃ are low level and high level, respectively, and its output is low level. Then, the high level output of the AND gate G ₂ causes one input of each of the AND gates G ₄ and G ₅ to be high level. Here, the call signal of the alarm device is based on the signal from the mode setting means 10 and is output only to the AND gate G ₅ . As a result, the counter circuit 56 of the priority means 55 becomes "1" and the first timer 57 is turned on. As a result, after the elapse of a predetermined time, the second activation switch 43 in the determination activation means 40 is turned on, and the same operation as described above is performed. At this time, if the line is still in use, the output of the AND gate G ₅ is sent to the counter circuit 56 of the priority means 55,
The counter circuit 56 becomes "0". As a result, the second timer 62 of the line opening means 60 is activated, and at the same time, the line closing relay A is activated to establish the busy state. The subsequent operation is the same as that described above. The contact b of the communication signal detection circuit 10 is
After the signal is sent to the control center via the telephone line, it is turned back on.

In the embodiment of the present invention, forcible opening is performed while the telephone line is in use, but it goes without saying that such an operation is premised on the system.

In addition, although the dial system is described in the embodiment, it is needless to say that the present invention is also applicable to the touch-tone system.

Further, in the present embodiment, the calling information of the alarm device is encoded and transmitted from the response means 70 to the control center, but a voice message may be transmitted.

Further, although the response means 70 is activated by reversing the polarity, the response means 70 may be activated by sending a response signal from the control center and detecting this signal.

[Effect of device]

As described above, according to the present invention, the opening / closing means is provided on the public communication line as described above, which has a bypass path for communication signals bypassing the photocoupler, and which is opened when the alarm device requires a call. By configuring the communication signal detection circuit by providing the above on the bypass path, the communication signal in the public communication line is not normally blocked by the photocoupler, so that the minute communication signal in the public communication line is received. The communication device can be connected to the alarm device, and for example, a facsimile device that receives a no ringing service can also be connected.

[Brief description of drawings]

FIG. 1 is a circuit diagram of a communication signal detection circuit provided in a transmission device according to the present invention, FIG. 2 is a configuration diagram showing an embodiment of the transmission device according to the present invention, and FIG. 3 is a conventional transmission. It is a block diagram which showed an example of an apparatus. (Explanation of symbols) 10 ... Communication signal detection circuit, b ... Normally closed contact,
11 …… Photo coupler, 12 …… Bypass route.

Claims (1)

[Scope of utility model registration request] 1. When a public communication line is normally connected to a first communication means for receiving a no-ringing signal, and when a call to the outside using the second communication means is required, the first communication means is used.
A communication device for temporarily connecting the public communication line to the second communication unit immediately or after a lapse of time after determining the communication state of the communication unit of the first communication unit from the public communication line. In a transmission device for determining the communication state of the first communication means based on a communication signal in the public communication line detected by a photocoupler provided in a communication path to the communication path, a photocoupler is bypassed in the communication path. A bypass path for the communication signal to be provided is provided, and in the bypass path,
The transmission is characterized in that an opening / closing means is provided which normally closes the bypass path and opens the bypass path when a call to the outside using the second communication means is required. apparatus.