JPH03210866A - Communication equipment - Google Patents

Abstract

PURPOSE:To detect a fault of other equipment and to make a call by providing a line connection relay and a transmission interface to connect plural communication equipments to one telephone line. CONSTITUTION:A CPU 1 implements data transmission, for example, sends and receives a presence data of a call request, for example, with a slave set via a transmission interface 8 normally. If any of slave sets has a call request or a data for a busy state is sent, the other equipments are disable of making a call. When the transmission with any or all slave sets is faulty in the transmission via the transmission interface 8, the supply power interruption (power failure) of the equipment is discriminated and the master set makes transmission according to the similar sequence to that of a conventional example to inform it.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a communication device that performs data communication via a telephone line.

[Conventional technology]

A conventional device of this type is shown in FIG. In the same figure, (1) is the CPU, (2) is the capacitor (
4) and an incoming call detection circuit consisting of a relay (3) and its contact (3a), (5) a dialing relay having a contact (5a), and (6) a transmission signal superimposition transformer, and a communication device having these configurations. The device operates as follows.

The operation will be described below based on the flowchart in FIG. First, when CPU (1) detects that the call request input is turned on (551), CPt1 (1) activates the incoming call detection circuit (
Check the state of relay (3) in step 2) (S52).

When the line is incoming, the incoming signal is transferred to a capacitor (4
) turns on relay (3). In this case, the CPU
(1) is in a standby state. If there is no incoming call, relay (3)
is off, and the CPU (1) is connected to the dial relay (5
) is turned on and its contact (5a) is closed, thereby short-circuiting the line via the transformer (6) (S53) Next, the CPU (1) turns on the dial relay ( 5) is turned on and off and then maintained in the on state (S54). After that, CPII (
In step 1), after transmitting data to and from the destination communication device, the relay (5) is turned off to end the process (S55.556).

[Problem to be Solved by the Invention] Conventional communication devices are configured as described above, so when multiple communication devices are connected to the same line, all communications are handled by each communication device requesting human power. The devices will connect to the same line and normal data communication will not be possible. Furthermore, the number of communication devices connected to one line is limited to several because of the impedance.

That is, it was not possible to connect multiple communication devices to the same line.

In addition, as a system for detecting abnormalities in multiple communication devices connected to the same line, for example,
As shown in Publication No. 7-14272, there is a system in which multiple processors connected in parallel to a common bus are diagnosed by a control processor, but when connecting this to a communication device and the same line, the above-mentioned However, it was difficult to resolve the situation without being subject to such restrictions.

This invention was made in order to solve the problems in the conventional example as described above, and even if multiple communication devices are connected to the same line, data can be transmitted normally, and abnormalities can be detected and reported to the central device. The purpose is to provide communication equipment.

[Means for Solving the Problems] A communication device according to the present invention is a system in which a plurality of communication devices that transmit data via a telephone line are connected to the same telephone line. a transmission circuit for transmitting data between the communication devices; a transmission abnormality detecting means for detecting a transmission abnormality by the transmission circuit; and a transmission abnormality detecting means for detecting a transmission abnormality by connecting a line to control data transmission when a transmission request is made by the transmission circuit; In some cases, the central device is equipped with control means for controlling data transmission.

[Effect]

In this invention, in order to prevent the telephone line from being captured at the same time, only those who have received line capture permission via the transmission circuit can make calls, and when the transmission abnormality detection circuit is activated, the connection circuit connected to the line is activated. Activate it, make a call to the telephone line, and transmit data.

[Embodiment] An embodiment of the present invention will be described below with reference to FIG. 1, in which the same parts as those in FIG. 4 are denoted by the same reference numerals, and FIG. This will be explained based on the diagram. In Fig. 1, (8) is a transmission interface for transmitting between multiple communication devices, and (9) is a line connection relay that has a contact (9a) that is closed during transmission control.
10) is a battery backup power source consisting of a battery (11) and a DC power source (12), which is provided in the main communication device. In addition, for communication devices other than the main one, a power source (13) that does not include the battery (11) (see Figure 2)
will be provided. Furthermore, in order to prevent the telephone line from being captured at the same time, the CPU (1) also ensures that only those who have received permission to capture the line via the transmission circuit can make calls, and when the transmission abnormality detection circuit operates, the CPU (1) It has the function of activating the connection circuit connected to the telephone line, making calls to the telephone line, and controlling the data transmission.

Next, the specific operation of the CPII (1) according to the above configuration will be explained with reference to the flowchart of FIG. 3 regarding the operation of the first stage (i=1 to N) communication device in FIG. .

As shown in FIG. 2, this device is connected to a plurality of telephone lines, and in this embodiment, for example, the first stage communication device is the parent device, and the second to Nth stage communication devices are the slave devices. (A device other than the first may be the parent device).

Note that the parent device has a power source with battery backup (10), and the slave device has a power source without battery (13).

The operation of the parent device will be explained below.

The CPU (1) normally performs data transmission with the slave device via the transmission interface (8), for example, exchanging data regarding the presence or absence of an outgoing request. If any of the slave devices receives a call request or transmits data indicating that it is in a calling state, the other devices become unable to make calls.

Next, in transmission via the transmission interface (8),
If transmission with any or all slave devices becomes abnormal (Fig. 3, 531), the power supply to the device concerned (
power outage), and the main device should notify that fact (transmission operation in the same sequence as the conventional example (Fig. 3, 532 to 5)
35).

Note that even if the power supply to the first stage communication device is cut off, this device can operate even during a power outage because it is equipped with a battery.

In addition to the above embodiment, only the main device has the line connection relay (9) turned on at all times, so that when there is an incoming call on the line originating from the communication device at the center (when a call is received), this is answered. The central device may receive a telephone call) and transmit the status of each slave device, for example, status information indicating whether it is normal or under power outage, to the center device.

[Effects of the Invention] As described above, according to the present invention, by providing a line connection relay and a transmission interface, it is possible to connect a plurality of communication devices to one telephone line, and
It is possible to detect abnormalities in other devices and send a message, and by having only a battery in the main device, it is possible to detect a power outage in other devices and send a message to notify that fact.

[Brief explanation of drawings]

Figures 1 to 3 explain this invention.
FIG. 2 is a configuration diagram of a communication device according to an embodiment, FIG. 2 is a connection configuration diagram with a plurality of communication devices, FIG. 3 is an operation flowchart of CPt1, and FIG. N4 and FIG. 5 explain conventional examples. FIG. 3 is a corresponding diagram between FIG. 1 and FIG. 3; In the figure, (1) is the relay, (5) and (5a) are the relay for dialing and contacts, (8) is the transmission interface, (9) and (9a) are the relays and contacts for line connection, (1
0) is a power supply with battery backup. In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] In a system in which multiple communication devices that transmit data via a telephone line are connected to the same telephone line, a connection means for connecting to the telephone line, a transmission circuit that transmits data between the plurality of communication devices, and transmission by the transmission circuit. A transmission abnormality detecting means for detecting an abnormality, and a control means for connecting a line and controlling data transmission when a transmission request is made by the transmission circuit, and controlling data transmission to a center device when the transmission abnormality is detected. Characteristic communication device.