JP2918382B2 - Terminal side network controller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a no-ringing communication system for transmitting diagnostic values such as water, gas and electricity using a general public telephone line, and a terminal-side network control which can be used for a communication system in a private branch exchange. It concerns the device.

[0002]

2. Description of the Related Art Generally, a data transmission method using a general public telephone line is most practical as a method for collecting information on the amount of sales in a vending machine or an automatic meter reading in households such as water, gas and electricity. It is rich. Among these systems, there is a no-ringing communication system for performing communication without ringing the bell of a telephone. However, except in the home, a company or the like generally uses a telephone line using a private branch exchange.

[0003]

In the no-ringing communication system, it is necessary to install a special trunk called a no-ringing trunk.

[0004] In addition, this trunk cannot perform no ringing communication on the telephone line of the private branch exchange because there is no operation of reversing the polarity. For this reason, even if the terminal side network control device is connected to the private branch exchange, it is not possible to perform meter reading.

[0005] That is, as shown in FIG. 6, in the conventional terminal-side network control device 1, a terminal calling circuit 2 is connected to a local line circuit 3 composed of a ringer detecting circuit and a reciprocity detecting circuit. This conventional no-ringing communication system
It operates when the polarity inversion (the line-to-line voltage is inverted from -48 V to +48 V) is detected. For this reason, since there is no polarity reversal in the private branch exchange (PBX), the terminal side network control device 1 cannot be used in the extension.

The following methods are conceivable for connecting the terminal-side network control device to the extension of the private branch exchange and performing data communication. That is, the terminal-side network controller 1 discriminates between the terminal-side network controller and the home telephone by counting the number of ringers even if the polarity is not inverted. For example, since the ringer signal sounds for one second and pauses for two seconds, this is detected by the ringer detection circuit and determined by the CPU circuit to distinguish between the terminal-side network control device and the home telephone. I do.

[0007] Then, in checking the meter or sensor of the terminal device, if the communication operation is not limited to the time, for example, if the ringer's count value is set to 1 at about 1 o'clock at midnight, the ringer sounds. At the same time, the terminal-side network control device starts operating. Therefore, it is almost equivalent to the no-ringing communication operation. In the daytime, the ringer value is set to a large value in order to give the home telephone a priority.

That is, at this time, in FIG. 6, when the photocoupler PC1 is turned on simultaneously with the ringer,
Since a bias is applied to the resistors R1 and R2, the transistor Q2 is also turned on. This is also achieved by resistors R3 and R4
, A bias is applied to the transistor Q1 to turn on the transistor Q1. As a result, a current flows through the resistor R5 and the transformer T1 to cause off-hook.

However, the conventional circuit shown in FIG. 6 cannot connect a plurality of terminal side network controllers. This is because, when a plurality of terminal-side network controllers are connected at the same time, the current consumption of each terminal-side network controller increases, and the DC condition is not satisfied.

In view of the above, the present invention performs meter reading of terminal equipment even in a communication system in which a no ringing trunk is not installed in a terminal exchange, with a plurality of terminal network controllers connected to a private branch exchange. Is what you can do.

[0011]

The object of the present invention is to provide terminal equipment 18, 19 connected to a plurality of terminal-side network controllers 17 connected to the extension of the private branch exchange 43.
Between the general public telephone line 14 and 2
In a data communication system for transmitting data by using the ringer 1 and 23, a ringer (caller)
A counting means 46 for counting the number of teeth) signal when the count result of said counting means 46 has decreased to the above set value, the data link establishing means 48 for switching the line from the home telephone 20 to the terminal equipment 18 and 19 side, an impedance setting means 45 for setting the impedance of the control apparatus body to fit within the standard value when the count result of the counting means 46 becomes equal to or greater than the set value, set Me pre selection signal sent from the center apparatus 10 connection identified total number and whether it matches the device's own selection number data, and a selection signal identifying means 49 responsive when the selected number matches.

A ringer input count setting means 47 is provided.
There are provided means 47a for constantly fixing the number of times of ringer signal counting within 24 hours, and means 47b for dividing the number of times of ringer signal into a plurality of time periods and setting the number of times of ringer signal counting for each of a plurality of time zones.

If the terminal-side network control device includes a polarity detection circuit 31 for detecting the polarity of the telephone line and a no-ringing detection circuit 34 for detecting no-ringing based on the reversal of the polarity, no-ringing Both communication and automatic transmission / automatic reception are possible.

[0014]

In the means for solving the above problems, even in a plurality of terminal-side network control devices installed in the private branch exchange, the off-hook is not performed until the ringer signal reaches a preset fixed number. A priority can be given to the installed extension telephone 20 side.

Further, even without reversing the polarity, Yotsute the Rukoto is counted up to the number ringer signal is set in advance, enter the terminal network controller is Ofufutsuku to meter reading system, meters, terminals such as a sensor The device information can be collected and communication with the center-side network control device can be performed.

Even if a plurality of terminal-side network controllers are connected, only the terminal-side network controller 17 set by the selection signal discriminating unit 49 is given priority by the impedance setting unit 45 and within the standard value. Communication with the center-side network control device.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 2 is a system configuration diagram of a no-ringing communication system according to an embodiment of the present invention. This shows a system with a no-ringing trunk.

As shown in FIG. 2, the center device 10 includes a host computer 11 and a center-side network control device 12.
The center-side network control device 12 is connected to the host computer 11 via a connection line 13 and a telephone line 14.
Is connected to the center-side switching center 15 via the.

On the other hand, the terminal device 16 includes a terminal device such as a terminal side network control device 17, a meter circuit 18, a sensor circuit 19, and a home telephone 20.

The terminal-side network control device 17 is connected to a terminal-side exchange 22 via a telephone line 21. The center switching center 15 and the terminal switching center 22 are connected to the interoffice trunk line 2.
3 are interconnected. A no-ringing trunk 27 is connected to the terminal-side exchange 22 via interface lines 25 and 26.

FIG. 1 is a block diagram of the terminal-side network controller 17. As shown in the figure, the terminal-side network control device 17 detects a ringer detection circuit 30 that detects a ringer signal (calling signal) that has been transmitted to the terminal-side network control device 17 and an inversion of the line voltage from the terminal-side telephone exchange 22. Polarity detection circuit 31, terminal calling circuit 33 for dial operation and off-hook operation
A no ringing detection circuit 34 for detecting which terminal side network control device 17 is awakening after the reciprocity detection,
A modem circuit 35 that communicates with the center-side network controller 12;
Interface circuits 38 and 39 that communicate with the meter circuit 18 and the sensor circuit 19; a busy detection circuit 40 that detects the use state of the telephone 20 installed in the house; a power supply circuit 41 that supplies power to each unit; And an arithmetic circuit 42 (CPU circuit 42) for arithmetically processing signals from the respective circuits.

The terminal-side network controller 17 mainly operates in the arithmetic circuit 42 so that when the plurality of terminal-side network controllers 17 are connected to the private branch exchange 43, each controller 17 has an impedance within a standard value. , An impedance setting means 45 for presetting the impedance, a number counting means 46 for counting the number of ringers, a ringer input number setting means 47 for setting the number of ringer inputs according to the time zone, and the count result by the counting means 46 is set. When the value is equal to or more than the value, the data link establishing means 48 for switching the line from the home telephone 20 to the terminal device side, and whether or not the preset self-selection number and the transmitted data match or not is determined. Selection signal identification means 49 for outputting a response signal.

The ringer input count setting means 47 includes a means 47a for constantly fixing the count of the call signal within 24 hours, and a means 47a for dividing the count into a plurality of times and setting the count of the call signal in each of a plurality of time zones. Means 47b
And The means 47b for setting the number of counts for each of a plurality of time zones is, for example, divided every six hours so that once from 0:00 to 6:00, once from 6:00 to 12:00, ten times, and from 12:00 to 18 The ringer count is set such that 10 times till hour and 5 times from 18:00 to 24:00.

The communication operation in the above configuration where a plurality of terminal side network controllers 17 are connected to the private branch exchange 43 will be described. A ringer signal (call signal) is transmitted from the center device 10 to the terminal side network control device 17 through the private branch exchange 43. At this time, even if the polarity is not inverted, the ringer detection circuit 3 of the terminal-side network control device 17
At 0, the number of ringers is detected and input to the counting means 46 of the CPU circuit 42.
By distinguishing between the terminal-side network control device 17 and the home telephone 20 by comparing and determining with the set value set in the above. The ringer signal sounds for one second and pauses for two seconds.

The value set by the input count setting means 47 is determined as appropriate. That is, in checking the meter circuit 18 and the sensor circuit 19 of the terminal device,
If the communication operation is not limited to time, for example,
At about 1 o'clock in the middle of the night, if the ringer count value is set to 1, the terminal-side network control device 17 starts operating at the same time as the ringer rings. Therefore, it is almost equivalent to the no-ringing communication operation. In the daytime, the ringer value is set to a large value in order to give the home telephone a priority.

That is, at this time, in FIG. 3, when the photocoupler PC1 is turned on simultaneously with the ringer,
Since a bias is applied to the resistors R1 and R2, the transistor Q2 is also turned on. This is also achieved by resistors R3 and R4
, A bias is applied to the transistor Q1 to turn on the transistor Q1. As a result, a current flows through the resistor R5 and the transformer T1 to cause off-hook.

At this time, since a plurality of switches of the photocouplers PC2 to PC6 as the impedance setting means 45 are provided in series with the coil L1 having a large AC impedance, even when a plurality of the terminal side network control devices 17 are connected, each of them is connected. The current can be reduced, and the total value is controlled to a value substantially equivalent to one terminal-side network control device 17.

It should be noted that the impedance setting means 45 is not limited to the above-mentioned circuit, and it is possible to use a current control circuit. For example, when one of the plurality of terminal-side network controllers 17 is selected by the selection signal transmitted from the center device 10, the other terminal-side network controllers become high impedance and are selected. It may be configured that only one device communicates with the center device 10 by maintaining the standard value.

FIG. 5 shows the connection operation in the private branch exchange. The signal up to the off-hook is the communication between the private branch exchange 43 and the terminal-side network control device 17, but the selection signal is transmitted to the center device 10
From the signal. At this time, the communication with the center device 10 has already been started.

Next, since the present embodiment has a no-ringing detecting circuit, a no-ringing communication operation will be described. FIG. 4 shows a connection operation at the time of no ringing communication. Here, the NRS selection signal is transmitted from the terminal-side exchange 22. At the time of ringer reception, PBX
Since this signal is not transmitted on the extension 43, it is necessary to change the software of the center device so that the center device 10 transmits the signal. The change of software and hardware on the center side is not described in the present invention because it is out of the scope. In FIG. 4, the selection signal is not transmitted from the center device but is still transmitted from the terminal-side exchange 22. .

Note that the present invention is not limited to the above-described embodiment, and it goes without saying that many modifications and changes can be made to the above-described embodiment within the scope of the present invention.

[0032]

As is clear from the above description, according to the present invention, even if a plurality of terminal side network controllers are installed in the private branch exchange, the terminal does not off-hook until the count of the ringer signal reaches the set value. Priority can be given to the extension telephone set installed in the side network control device. Special
The number of ringer signal counts according to the time zone
By doing so, for example, give priority to the telephone during the daytime,
Between devices, priority can be given to terminal devices for efficient use
it can.

Further, even without reversing the polarity, by counting the ringer signal, when it becomes a set value, and Ofufutsuku the terminal-side network controller enters a meter reading system, communicate with Centers side network controller Since communication is possible, communication can be performed without using ringing.

Even when a plurality of terminal side network controllers are connected to the private branch exchange, only the set terminal side network controller is preferentially selected by the impedance setting means according to the standard value when the link is established. It has been able to communicate with Centers side network controller.

[Brief description of the drawings]

FIG. 1 is a block diagram of a terminal side network control device according to an embodiment of the present invention.

FIG. 2 is a diagram of a no-ringing communication system according to an embodiment of the present invention.

FIG. 3 is a circuit diagram of a terminal calling circuit according to the present invention.

FIG. 4 is a diagram showing a connection operation with no ringing of the present invention.

FIG. 5 is a diagram showing a connection operation in the private branch exchange of the present invention.

FIG. 6 is a conventional terminal calling circuit diagram.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Center apparatus 17 Terminal side network control apparatus 18 Meter circuit 19 Sensor circuit 20 Telephone 43 Private branch exchange 45 Impedance setting means 46 Counting means 47 Ringer input frequency setting means 48 Data link establishment means 49 Selection signal identification means

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-246465 (JP, A) JP-A-3-14364 (JP, A) JP-A-61-230547 (JP, A) JP-A-3-230 293853 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) H04M 11/00-11/10 H04Q 9/00

Claims (3)

(57) [Claims] 1. A data communication for transmitting data using a general public telephone line between a terminal device connected to each of a plurality of terminal side network control devices connected to an extension of a private branch exchange and a center device. in the system, a counting means for counting the number of calls signal from the center apparatus, when the count result by said count means has decreased more than the set value, the data link establishment means for switching the line from the home telephone to the terminal equipment side If the impedance setting means for setting the impedance of the control apparatus body to fit within the standard value when the count result exceeds a preset value by said counting means, a selection signal sent from the center device equipment itself whether identified coincides with the data of the selected number, and the selection signal identifying means to respond when matches, the count of the paging signal It is fixed at all times the number in the 24 hours
Means and a call for each of a plurality of time periods.
Means for setting the number of signal counts . 2. The terminal-side network control device according to claim 1,
A polarity detection circuit for detecting the polarity of the telephone line;
No ringing is detected based on the inversion operation of
Ringing detection circuit, no ringing communication and automatic
A terminal-side network control device wherein both outgoing and automatic incoming calls are possible . 3. A plurality of terminals connected to an extension of a private branch exchange.
Terminal equipment and center equipment connected to each of the back-end network controllers
Data is transmitted to and from the device using a general public telephone line
The number of call signals from the center device in a data communication system
Counting means, and the count result by the counting means is greater than a set value.
Switch line from home phone to terminal device when connected
When the count result by the data link establishment means and the count means exceeds a set value
The impedance inside the control device
Impedance setting means to be set together, and selection of the selection signal sent from the center device by the device itself
Identify whether or not the data matches the number data.
A response signal selection means, a polarity detection circuit for detecting the polarity of the telephone line, and a no-ringing detection circuit for detecting no-ringing based on the inversion operation of the polarity. A terminal-side network control device, wherein the terminal-side network control device is enabled.