JPH05252302A - Terminal network control device - Google Patents

Abstract

PURPOSE:To provide a terminal network control device capable of executing communication based upon transmitting or terminating operation with priority in accordance with the degree of urgency for the access from a center device. CONSTITUTION:A terminal network control device body 1 is provided with a terminating processing part 5 for receiving a terminating signal from a center device or the like through a telephone line 6 and executing communication and a transmitting processing part 2 for informing the start of transmitting operation to the processing part 5 based upon a transmission request or the like generated from a meter 7 and executing communication based upon transmitting operation. The processing part 5 is provided with a priority signal receiving means 3 for receiving and judging a signal indicating which is to be executed with priority, terminating communication or transmitting communication through a telephone line 6 and a transmission request signal sending means 4 for transmitting a busy signal to the center device through the line 6 at the time of judging that transmitting operation is prior to terminating operation based upon the priority judging result of the means 3 when terminating operation from the center device is generated prior to the close of a DC loop after starting the transmitting operation of the processing part 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal network control device used for data communication, and more particularly to a terminal network control device capable of automatic transmission and reception.

[0002]

2. Description of the Related Art Conventionally, as a terminal network control device of this type, for example, a plurality of devices such as a gas meter and a water meter are connected and a meter reading value of these devices is taken out from a center or a gas detected by the device. There is a terminal network control device that reports leak information to the center. There are two types of transmission means of these terminal network control devices: a means for transmitting at a fixed time based on a calendar in the terminal network control device and a means for transmitting in response to a transmission request from a device. The means by which the equipment connected to the terminal network control device requests transmission differs depending on the equipment, the means by which the contact is opened and closed, the means by which the transmission is requested by applying a voltage for a predetermined time, and the message is transmitted by serial communication. A means for urging the call to be sent is used. In addition, these terminal network control devices cannot be connected to the center device in the transmission processing by the transmission request from any of the connection devices, and are waiting in the state where the DC loop of the telephone line is opened to wait for the redial time. The state exists. In this state, when an incoming call from the center device is accepted, these conventional terminal network control devices use either one of means for always giving priority to communication by outgoing call or always giving priority to communication by incoming call from the center. ..

[0003]

However, in the above configuration, when priority is given to communication by transmission, which device is connected from the center device to the terminal network control device until the communication by transmission is completed. I can't hold the state of. Further, if communication by incoming call from the center device is always prioritized, the notification by the terminal transmission due to gas leak information etc. will be delayed until the communication by the incoming call from the center device is completed, and the response will be delayed. There is. Furthermore, the terminal network control device cannot judge whether or not the connected device is an urgent call request such as a means for requesting a call request from the device by opening and closing a contact, etc. However, there is a problem in that the priority of the communication originating from the call cannot be changed by the applied communication network system utilizing the terminal network control device.

The present invention solves the above-mentioned conventional problems, and a terminal network control device capable of prioritizing outgoing communication and incoming communication depending on the urgency of access from the center device. The purpose is to provide.

[0005]

In order to solve the above-mentioned problems, the terminal network control device of the present invention receives a signal from the center device which indicates whether the communication by the incoming call or the communication by the outgoing call is prioritized. When there is an incoming call from the center device before the DC loop of the telephone line is closed because the outgoing call is made by the priority signal receiving means and the data terminal, the priority signal receiving means determines that the outgoing call has priority over the incoming call. Is provided with transmission request signal transmitting means for transmitting a transmission request signal to the center device.

[0006]

According to the present invention, when there is an incoming signal from the center device before the DC loop of the telephone line is closed because the data terminal transmits the signal, the priority signal receiving means receives this signal. If the result of the determination is that the outgoing call has priority over the incoming call, the outgoing call request signal is transmitted from the outgoing call request signal transmitting means to the center device. As a result, the center device recognizes that the terminal network control device is about to enter the calling operation.

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, reference numeral 1 denotes a terminal network control device main body of the present invention, which is connected to a telephone line 6 and a meter 7 such as a gas meter which is a data terminal. The terminal network control device body 1 informs the incoming call processing unit 5 that receives an incoming call from the center device or the like via the telephone line 6 and communicates with the incoming call processing unit 5 by the outgoing call request from the meter 7. It is composed of a transmission processing unit 2 which notifies and communicates by transmission. Further, the incoming call processing unit 5 receives a signal indicating which of incoming call communication and outgoing call communication is to be prioritized.
If an incoming call from the center device or the like occurs before the priority signal receiving means 3 for determining the reception via the call originator and the call origination processing unit 2 starts the originating operation to close the DC loop of the telephone line 6, the priority signal reception There is provided a call origination request signal transmitting means for transmitting a call origination request signal to the center device or the like through the telephone line 6 when it is judged that the origination is prioritized over the incoming call based on the result of the priority judgment of the means 3. As a format of the signal indicating which of the incoming call and the outgoing call communication received by the priority signal receiving means 3 is prioritized and the outgoing call request signal transmitted by the outgoing call request signal sending means 4 is a predetermined frequency that can be distinguished from other signals. Although an alternating current signal and a signal obtained by modem-modulating a telegram can be considered, in the embodiment of the present invention, the priority signal is a priority identification telegram expressed in a telegram format, and the transmission request signal is also a transmission request expressed in a telegram format. A telegram shall be used.

Next, the operation of the embodiment of the present invention will be described with reference to FIGS.
Will be explained. FIG. 2 is a flow chart of the operation of the incoming call processing unit 2, and FIG. 3 is a flow chart of the operation of the outgoing call processing unit 2. When a call request is issued from the meter 7 to the call processing unit 2, the call processing unit 2 closes the DC circuit of the telephone line 6 (21 in FIG. 3). After dialing (23 in FIG. 3), it is determined whether or not there is a response from the center device or the like within a predetermined time (24 in FIG. 3). If there is a response, communication processing between the meter 7 and the center device (see FIG. 3) 25) is performed and, after the communication processing is completed, the DC circuit of the telephone line 6 is opened (26 in FIG. 3) and the transmission processing is completed. After dialing (23 in FIG. 3), it is determined whether there is a response from the center device or the like within a predetermined time (2 in FIG. 3).
4) If there is no response, open the DC circuit (24 in Fig. 3).
It is judged whether or not to redial (27 in FIG. 3). When redialing, wait for a predetermined time so that redialing does not occur three times or more within 3 minutes (28 in FIG. 3).
The DC circuit is retried from the closing operation (21 in FIG. 3). When the call processing operation is stopped, or when the call processing 2 operation is performed and the DC loop of the telephone line 6 is opened for standby for a predetermined time (28 in FIG. 3), from the center device or the like. When an incoming call is received, the incoming call processing unit 5 accepts the incoming call and operates as shown in FIG. First, the DC circuit is closed (11 in FIG. 2), and it is determined whether or not the priority identification message is received from the center device or the like within a predetermined time (1 in FIG. 2).
2). When the priority identification message is received within the predetermined time, it is determined whether the priority identification message is designated to give priority to the outgoing call process or the incoming call process (13 in FIG. 2). When the calling process is designated with priority, a calling request message is sent as a calling request signal in order to notify the center device via the telephone line 6 that the access from the center device is to be refrained from for calling (see FIG. 2). 16) After the DC circuit of the telephone line 6 is opened (18 in FIG. 2), the incoming call processing ends. When the incoming call process is designated with priority, the communication process between the meter 7 and the center device (15 in FIG. 2) is performed, and after the communication is completed, the DC circuit of the telephone line 6 is opened (18 in FIG. 2) and the incoming call process ends. To do. Even when the terminal network control device of the present invention is a device compatible with no-ringing communication, the operation of the incoming call processing part 5 takes into account the no-ringing connection procedure and the closing and opening operations of the DC circuit of the telephone line 6 are semi-closed. However, the basic operation can be the same as the operation of the incoming call processing shown in FIG. As described above, according to the urgency of the center, there is an effect that the communication due to the incoming call generated by accessing from the center device is interrupted and the communication due to the outgoing call can be prioritized, or the communication due to the incoming call can be prioritized.

[0010]

As described above, according to the terminal network control apparatus of the present invention, the following effects can be obtained. That is, until the communication by the call is given priority and the communication by the call is completed, it is impossible to keep track of which device is connected from the center device to the terminal network control device main body, and the communication by the call from the center device is always maintained. In the case of prioritizing, there is no problem that the notification due to the transmission of the data terminal due to the gas leak information or the like is delayed until the time when the communication due to the incoming from the center device is completed and the response is delayed.

[Brief description of drawings]

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

FIG. 2 is a flowchart for explaining the operation of the terminal network control device body of the same device.

FIG. 3 is a flowchart for explaining the operation of the meter of the device.

[Explanation of symbols]

 1 Terminal Network Control Device Main Body 2 Originating Processor 3 Priority Signal Receiving Means 4 Originating Request Signal Transmitting Means 5 Incoming Call Processor 6 Telephone Line 7 Meter

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshinori Oishi 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Masaaki Sakata 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd.

Claims (1)

[Claims] 1. A terminal network control device main body for connecting information between a center device and a data terminal, which are connected via a telephone line, for exchanging information between the center device and the data terminal, and the terminal network control. Priority signal receiving means provided in the main body of the device for receiving and discriminating a signal indicating whether to prioritize incoming call communication or terminal outgoing communication from the center device, and direct current of the telephone line for outgoing from the data terminal If there is an incoming call from the center device before closing the loop and the priority signal receiving means determines that the outgoing call has priority over the incoming call, a call origination request for transmitting a call origination request signal to the center device A terminal network control device comprising a signal transmitting means.