JP3625644B2 - Line connection method and line connection apparatus for data collection system using telephone private branch exchange line - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention provides line connection of a data collection system that shares the line of a telephone private branch exchange as a data transmission line, which is used for temperature and humidity management, facility temperature measurement / condition monitoring / control in a factory or office building, centralized meter reading, etc. The present invention relates to an improvement of a method and a line connection apparatus.
[0002]
[Prior art]
An in-company data collection system that collects various data in a company using a telephone line accommodated in a telephone private branch exchange normally shares a line with a telephone line as a data transmission line for economic efficiency. Some line switching means is required for the case of a telephone call and for the case of data collection.
[0003]
8 and 9 are diagrams showing a conventional relay system for a telephone private branch exchange that performs telephone exchange and data exchange by sharing a telephone line.
[0004]
FIG. 8 is a diagram showing a relay method in the case of separately installing a data dedicated exchange for exchanging signals outside the voice band for data transmission, regardless of the telephone private branch exchange in the case of data exchange. This is done by an out-of-band carrier signal. That is, in the case of data exchange, regardless of the telephone private branch exchange PBX, a data dedicated exchange DEX for exchanging signals outside the voice band for data transmission is installed separately, and the band used for telephone calls and data transmission are used. Line devices TRK for separating / combining the carrier bands of the two to a common line are installed at each location. PC is a data center computer, DT is a data terminal, MOD is a modulation / demodulation device that modulates or demodulates a digital signal of data into a carrier signal, and TEL is an extension telephone of the telephone private branch exchange PBX.
[0005]
Further, FIG. 9 shows a relay system in the case of using a device (generally called a network control device) for switching and connecting a line to a modem device to which a telephone or a data terminal is connected for connecting a telephone and data collection. FIG.
[0006]
In FIG. 9, a network control unit NCU1 is connected to a computer PC as a data center via a modem MOD1, and a computer PC is connected to the network terminal NCU2 from a data terminal DT1 via a modem MOD2. When collecting data, the computer PC activates the private branch exchange PBX via the network control unit NCU1 and calls the network control unit NCU2. The network control unit NCU2 detects a call signal (ringing signal) from the telephone private branch exchange PBX, recognizes that there is a connection request on its own line, and responds (off-hook). At this point, since it is unknown whether the call is a request for a telephone call or a request for data collection, the network control unit NCU2 does not send a call signal to the telephone TEL2 connected thereto.
[0007]
The network control unit NCU2 detects the switching signal transmitted from the network control unit NCU1 within a predetermined time after the response, thereby identifying that the connection request is for data collection, and then changing the line to the modem MOD2 Data collection is performed by switching to the side.
[0008]
When calling the telephone TEL1 connected to the network control unit NCU2 from the telephone TEL1 connected to the network control unit NCU1 or another ordinary telephone (not shown), the network control unit NCU2 detects the calling signal and responds once. When the switching signal is not received within a predetermined time, it is identified as a connection request for a telephone call, the network control unit NCU2 generates a ringing signal by itself and rings the telephone TEL2, and the telephone TEL2 responds. In this way, by automatically switching between telephone call and data transmission, one line can be shared for telephone and data transmission, or for a plurality of other devices such as facsimiles.
[0009]
[Problems to be solved by the invention]
As shown in FIG. 8, when a data dedicated exchange DEX for exchanging signals outside the voice band for data transmission is installed independently of the telephone private branch exchange PBX for data exchange, it is used for telephone calls. Naturally, a line device TRK for separating / combining a data band and a carrier band for data transmission into a line is required at each location as shown in FIG. 8 and a data dedicated exchange DEX is required separately. However, a large amount of capital investment is required.
[0010]
Further, in the conventional system shown in FIG. 9, for example, when calling the telephone TEL1 connected to the network control unit NCU2 from the telephone TEL1 connected to the network control unit NCU1 in FIG. When the network control unit NCU2 automatically responds (off-hook) and identifies that it is not a connection request for data collection, the telephone TEL2 must be called, and in this case, no call signal is received from the telephone private branch exchange PBX side. The network control unit NCU2 (same for the other network control units NCU1 and NCU3) needs to be equipped with means for generating a call signal, which increases the cost and size.
[0011]
Further, the telephone TEL2 connected to the network control unit NCU2 is called from the telephone TEL1 connected to the network control unit NCU1 and other ordinary telephones, and the telephone TEL2 responds, but the called person is absent. The responder of the telephone TEL2 is connected to the network controller NCU3 by using the telephone transfer function of the telephone private branch exchange PBX, assuming that it has moved to the location of the telephone TEL3 connected to the network controller NCU3. When trying to transfer to the telephone TEL3, the network control unit NCU3 responds once, and since the switching signal does not arrive within a certain time, the telephone TEL3 is ringed. However, if there is no one in the place where the telephone TEL3 is installed, the network controller NCU3 cannot respond to the line once responded (off hook) in the telephone TEL3, and the network controller NCU2 cancels the transfer of the telephone. It becomes impossible. For this reason, there is no choice but to disconnect (on-hook) the telephone TEL3 of the network control unit NCU3 or to disconnect the line (on-hook) on the network control unit NCU1 side that originated the call. As described above, the conventional network control apparatus is inconvenient for use in a telephone private branch exchange having a telephone transfer function.
(Object of invention)
A first object of the present invention is to provide a line connection method and a line connection apparatus for a data collection system using a line of a telephone private branch exchange, which can economically and easily construct a data collection system.
[0012]
A second object of the present invention is to provide a line connection method for a data collection system using a line of a telephone private branch exchange, which does not cause any inconvenience in using the telephone transfer function of the telephone private branch exchange.
[0013]
[Means for Solving the Problems]
In order to achieve the first object, the present invention according to claim 1 is a circuit connection method of a data collection system using a line of a telephone private branch exchange, wherein the line is connected between a calling side and a called side. In the case of data transmission when connecting at the calling side, the ringing tone of the telephone ringing signal sent from the telephone private branch exchange to the called side is received by the calling side according to the operation of the calling side. Is immediately disconnected, and after a certain period of time, the telephone call signal is recalled to the called party again, and when the number of repeated calls after a certain period of time after the disconnection reaches a predetermined number of times of 1 or more, the called party performs data transmission. In the case of a telephone call, the called party receives a call signal sent from the telephone private branch exchange to the called party in a plurality of cycles according to the operation of the calling party. In connection request for phone That the conjunction to determine the called side, the obtaining the determination result not in any of the line connection state of the data transmission connection state and the phone connection status, in accordance with the determination result, the data transmission connection state and the telephone connection It is characterized in that one of the line connection states is set.
In order to achieve the first object, the present invention as claimed in claim 3 is a line connection apparatus installed for each data terminal of a data collection system using a line of a telephone private branch exchange, Call signal detection means for detecting the call signal received and the telephone call signal sent from the telephone private branch exchange to the called party in accordance with the operation of the calling party is temporarily disconnected at the calling party in the case of data transmission. Then, after a predetermined time, the telephone call signal is re-recalled to the called party, and when the number of re-calling after a predetermined time after the disconnection reaches a predetermined number of 1 or more, the called party receives a connection request for data transmission. It is determined that there is a call, and it is determined that the called side is a connection request for the telephone by receiving a plurality of cycles of the telephone ringing signal sent from the telephone private branch exchange to the called side according to the operation of the calling side. Discriminating means and the discriminating means Until the determination result is obtained, the telephone private branch exchange line is not connected to either the data transmission means or the telephone, and the determination means determines that the connection request for data transmission is present. Switching the line for connecting the telephone private branch exchange to the telephone if the line for connecting the telephone private branch exchange is connected to the data transmission means and the determination means determines that the line is a connection request for the telephone. Means.
In order to achieve the second object, the present invention as claimed in claim 2 is characterized in that a called party enters a response state simultaneously with the data transmission connection state and detects a telephone response in the telephone connection state. It is characterized by doing so.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a diagram showing an example of a system configuration based on a line connection method of a data collection system using a line of a telephone private branch exchange, which is an embodiment of the present invention.
[0016]
In FIG. 1, PBX is a telephone private branch exchange, TEL1 to 3 are telephones, DT1 and 2 are data terminals such as temperature sensors, DC is a data collection center such as a personal computer, and CON1 to 3 are line connection devices. In accordance with a call and data transmission request, the line is switched to the telephones TEL1 to 3 and the data collection center DC or the data terminals DT1 and DT2.
[0017]
FIG. 2 is a block diagram of the line connection apparatus in FIG. 1. In this example, the line connection apparatus is shown as having both a line network control function and a signal modulation / demodulation function.
[0018]
In the line connection device CON shown in FIG. 2, the call signal detection circuit RD detects a call signal (ringing signal) appearing at the line terminal L from the telephone private branch exchange PBX in FIG. 1, and transmits the information to the microcomputer CPU. The telephone-side off-hook detection circuit OF detects the call / response (off-hook) state of the telephone (TEL 1 to 3 in FIG. 1) connected to the telephone terminal P and transmits it to the microcomputer CPU. The off-hook detection power source PW is a DC power source for operating the telephone-side off-hook detection circuit OF. Under the control of the microcomputer CPU, the data side off-hook transformer T closes the contact point d at the time of data collection and forms a direct current loop with respect to the line terminal L to create a response (off-hook) state. A data transmission connection state is established, connected to the microcomputer CPU via the device MOD, and data is sent from the microcomputer CPU to the line or from the line to the microcomputer CPU via the modem MOD. The contact x is a contact for operating exclusively from the contact d to connect the telephone terminal P to the line terminal L, and is controlled by the microcomputer CPU. In the normal state, the contact x is on the solid line side in FIG. If the telephone-side off-hook detection circuit OF detects an off-hook by calling (off-hook) a telephone (TEL 1 to 3 in FIG. 1) connected to the telephone terminal P, it is controlled by the microcomputer CPU. Moves in the direction of the dotted line to connect the telephones (TEL1 to TEL3 in FIG. 1) to the line terminal L and moves in the direction of the dotted line in FIG. 2 under the control of the microcomputer CPU when a call signal for a call arrives. Then, the line terminal L is connected to the telephone terminal P. The microcomputer CPU is connected to the data collection center DC or the data terminals DT1 and DT2 shown in FIG. 1 via the interface IF by the input / output terminal IO, and inputs data to be transmitted between them, Alternatively, the transmitted data is output. For example, a standard interface such as RS-232C is used as the interface IF, but the interface IF may not be required.
[0019]
FIGS. 3 and 4 are time charts for explaining the automatic line switching operation for call and data transmission performed using the line connection apparatus of FIG. 2 with the system configuration of FIG. 1, and FIG. FIG. 4 is a time chart showing the connection operation for data transmission.
[0020]
First, the connection operation in the case of a call will be described. FIG. 5 is a flowchart for explaining the line connection operation in the case of a telephone call.
[0021]
In FIG. 1, when the telephone TEL1 makes a call, a direct current flows from the off-hook detection power supply PW of the line connection device CON1 to the telephone-side off-hook detection circuit OF. Therefore, off-hook detection is performed, and the microcomputer CPU sets the contact x accordingly. Switch to the dotted line side. When the telephone terminal P is connected to the line terminal L, the telephone TEL1 activates the telephone private branch exchange PBX, and a dial tone is emitted from the telephone private branch exchange PBX to the telephone TEL1.
[0022]
Here, since the telephone TEL2 is called, and the extension number is dialed, the call arrives at the line connection device CON2 to which the telephone TEL2 is connected, and the call signal detection circuit RD receives the call signal (from the telephone private branch exchange PBX). A ringing signal) is detected. The format of the telephone ringing signal is determined by technical standards and arrives at the called party as a repeat signal of 1 second on and 2 seconds off. When the microcomputer CPU of the line connection device CON2 to which the telephone TEL2 on the called side is connected receives a signal in the form of repetition of 1 second on and 2 seconds off twice, the call signal interval is 2 seconds Is identified as a call request, the contact x is switched to the dotted line side, and the line terminal L is connected to the telephone terminal P. As a result, the ringing signal from the telephone private branch exchange PBX directly reaches the telephone TEL2, and the ringing of the telephone TEL2 causes the normal incoming state of the telephone TEL2 to appear, so that a nearby person answers the telephone TEL2 ( A call is made by going off-hook. When the telephone TEL2 responds, the DC current supplied from the telephone private branch exchange PBX flows to the telephone-side off-hook detection circuit OF of the line connection device CON2, so that off-hook detection is performed and the microcomputer CPU responds as the called side (off-hook). )
[0023]
In FIG. 3, when the call signal detection circuit RD of the line connection device CON2 detects the call signal for two cycles (1 second on, 2 seconds off), the microcomputer CPU has a call signal interval of 2 seconds. Is identified as a telephone call request, and the circuit is switched to the telephone terminal P. In the telephone TEL2, the bell starts ringing in response to the subsequent ringing signal, and the called party answers (off-hook) by the ringing of the telephone TEL2 and makes the telephone call. It is shown that the phone is on-hook when the call ends.
[0024]
When the end of the on-hook state, that is, the off-hook state is transmitted to the microcomputer CPU by the telephone-side off-hook detection circuit OF, the microcomputer CPU recognizes the end of the call.
[0025]
If the telephone TEL3 does not respond (off-hook) when the telephone is transferred from the telephone TEL2 to the telephone TEL3, the line connection device CON3 has not detected an off-hook, so if the transmission of the calling signal is stopped, the micro of the line connection device CON3 The computer CPU returns the contact point x from the dotted line side to the solid line side in response to the absence of the detection signal input from the calling signal detection circuit RD. Thereby, it will be in the state which waits for the next telephone call or data transmission.
[0026]
Next, a line connection method when performing data transmission will be described. 6 and 7 are flowcharts for explaining the line connection operation in the case of data transmission.
[0027]
In this case, the line connection control is automatically performed by the data collection center DC or the data terminals DT1 and DT2. As an example, it is assumed that the data collection center DC collects data from the data terminal DT2 accommodated in the line connection device CON3.
[0028]
First, when the data collection center DC instructs the line connection device CON1 to collect data from the data terminal DT2, the microcomputer CPU makes a call (off-hook) and sends the dial number of the telephone TEL3 on the called side. The line connection device CON3 is called by the telephone number TEL3, and the call signal detection circuit RD of the line connection device CON3 starts detecting the call signal (on for 1 second and off for 2 seconds). When the line connection device CON1 receives a ringing tone (ringback tone) sent from the exchange PBX to the calling side, it immediately disconnects the line. Thereby, in the line connection device CON3, the microcomputer CPU does not identify the call signal as a request for a call, and the call signal detection circuit RD of the line connection device CON3 receives one call signal that is on for 1 second. It starts to measure the time interval until the next call signal is received later.
[0029]
The line connection device CON1 makes a call again after waiting for a certain time (for example, 3 seconds or more and 10 seconds or less) and redials the number of the data terminal DT2 (number of the telephone TEL3) accommodated in the line connection device CON3. Then, as before, when the line connection device CON1 receives the ringing tone sent from the telephone private branch exchange PBX to the calling side in synchronization with the calling signal, the line is once disconnected again. Thereby, the line connection device CON3 determines whether or not the time interval between the first call signal and the current call signal is the fixed time, and if it is the fixed time, the count is 1.
[0030]
Next, the line connection device CON1 calls again and repeats the number of the data terminal DT2 (number of the telephone TEL3) accommodated in the line connection device CON3 in the same manner as the previous two times. However, the line is not disconnected even when the ringing tone is received as in the previous two times. On the other hand, in the line connection device CON3, the microcomputer CPU determines whether or not the time interval between the second call signal and the current call signal is the predetermined time, and sets the count to 2 if the time is constant. When this count is 2, it is identified as a connection request for data transmission. Then, the contact d of the data-side off-hook transformer T is closed and a primary loop of the data-side off-hook transformer T forms a DC loop with the line terminal L to respond (off-hook), and the line is prepared for data transmission. It is connected to the downstream modem MOD in an alternating manner.
[0031]
Thereby, thereafter, data transmission is performed between the data collection center DC accommodated in the line connection device CON1 and the data terminal DT2 accommodated in the line connection device CON3.
[0032]
As described above, calling / recalling is repeated three times to request data collection in order to distinguish erroneous dials, and a time interval of a certain time between 3 seconds and 10 seconds is counted once. Thus, the connection request for data collection may be identified when the count is 1. In addition, it is prohibited to make a call / recall continuously four times or more according to the technical standards of telephone.
[0033]
As is apparent from the above-described line connection method, when a call request and a data transmission request occur at the same time, a connection for a call is always given priority over a connection for data transmission.
[0034]
In this way, in order to clearly distinguish the pattern of the ringing signal (ringing signal) for connecting a call by a normal telephone and the ringing signal for connecting a data transmission, a long interruption time (pause) (for example, 3 When connection is made by generating a ringing signal (ringing signal) that is on for 1 second, the time required for data collection is inevitably increased. Therefore, it is not always appropriate to use this connection method for monitoring / measurement that performs high-speed data transmission, but high speed is not required for data collection, such as a temperature / humidity measurement system and a centralized meter reading system. It is very effective for building a data collection system.
[0035]
【The invention's effect】
As described above, according to the present invention as set forth in claim 1 or 3, it is not necessary to separately install a data-dedicated exchange as shown in FIG. Since it is not necessary to generate a call signal on the called side by using the call signal from the telephone, it is possible to economically and easily construct a data collection system or a line connection device using a telephone private branch exchange line. Can do.
[0036]
According to the second aspect of the present invention, since the called party does not answer unconditionally and the telephone answer is detected when the telephone is connected, it is inconvenient to use the telephone transfer function of the telephone private branch exchange. Can be prevented.
[Brief description of the drawings]
FIG. 1 is a diagram showing an example of a system configuration based on a line connection method of a data collection system using a line of a telephone private branch exchange, which is an embodiment of the present invention.
FIG. 2 is a block diagram of the line connection device in FIG. 1;
3 is a time chart for explaining an automatic line switching operation for a telephone call performed using the line connection device of FIG. 2 with the system configuration of FIG. 1;
4 is a time chart for explaining an automatic line switching operation for data transmission performed by using the line connection device of FIG. 2 with the system configuration of FIG. 1;
FIG. 5 is a flowchart for explaining a line connection operation in the case of a call.
FIG. 6 is a flowchart illustrating a part of line connection operation in the case of data transmission.
FIG. 7 is a flowchart for explaining the continuation of FIG. 6 in the line connection operation in the case of data transmission.
FIG. 8 is a diagram showing a conventional relay system of a data collection system that performs telephone exchange and data exchange by sharing a telephone line in a telephone private branch exchange.
FIG. 9 is a diagram showing a conventional relay system of a data collection system that performs telephone exchange and data exchange by sharing a telephone line in a telephone private branch exchange.
[Explanation of symbols]
CON1-3 Line connection device CPU Microcomputer d Contact DC Data collection center DT1, DT2 Data terminal IF Interface IO Input / output terminal L Line terminal MOD Modulator / Demodulator OF Telephone side off-hook detection circuit P Telephone terminal PBX Telephone private branch exchange RD Call signal detection Circuits TEL1 to 3 Telephone PW Off-hook detection power supply T Data-side off-hook transformer x Contact

Claims (3)

In the line connection method of the data collection system using the line of the telephone private branch exchange, when connecting the line between the calling side and the called side, in the case of data transmission, depending on the operation of the calling side Upon receiving the ringback tone of the telephone ringing signal sent from the telephone private branch exchange to the called party, the line is immediately disconnected once, and after a certain period of time, the telephone ringing signal is returned to the called party again. The called party determines that it is a connection request for data transmission when the number of re-calls after a certain time after the disconnection reaches a predetermined number of 1 or more. The called party determines that it is a connection request for the telephone by receiving a plurality of cycles of the telephone ringing signal sent from the telephone private branch exchange to the called party according to the operation, and the called party determines that the determination result Until you get Not in any of the line connection state of over data transmission connection state and the phone connection state, characterized in that in accordance with the discrimination result, was set to one of the line connection state of the data transmission connection state and the phone connection state A line connection method of a data collection system using a line of a telephone private branch exchange. 2. A line connection method for a data collection system using a telephone private branch exchange line according to claim 1, wherein the called party enters a response state at the same time as the data transmission connection state and detects a telephone response in the telephone connection state. . A line connection device installed for each data terminal of a data collection system using a line of a telephone private branch exchange, wherein the call signal detecting means for detecting a received call signal, and the telephone according to the operation on the calling side When the telephone ringing signal sent from the private branch exchange to the called party is data transmission, it is temporarily disconnected at the calling party, and after a certain period of time, the telephone ringing signal is reissued to the called party, When the number of re-calls after time reaches a predetermined number of 1 or more, the called party determines that it is a connection request for data transmission, and from the telephone private branch exchange to the called party according to the operation of the calling party Determining means for determining that the called party is a connection request for the telephone by receiving a ringing signal of the telephone to be transmitted for a plurality of periods, and connecting the line of the telephone private branch exchange until the determination result by the determining means is obtained. data And it is not connected to any transmission means and the telephone, if it is determined that the connection request for data transmission by said determination means, and connects the line of the telephone private branch exchange to the data transmission means A line connection apparatus comprising: a switching means for connecting a line of the telephone private branch exchange to the telephone when the determination means determines that the connection request is for a telephone.

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