JPH023895A - Guarding terminal equipment - Google Patents

Abstract

PURPOSE:To prevent a false alarm, and to detect disconnection trouble in its early stage so that it can be restored by making it possible to decide whether a sensor operated normally or a wiring to the sensor was disconnected by inverting the polarity of a supply current to plural kinds of the sensors. CONSTITUTION:When a control part 14 receives a signal showing that current does not flow in lines to the sensors 20-1, 20-2 from current detecting parts 11-1, 11-2, a relay 13 is operated, and turns a relay contact 13-a into a state shown by a broken line, and inverts the polarity of the current to be supplied to the sensors 20-1, 20-2, and when it receives the signal to mean that the current flows from the current detecting parts 11-1, 11-2, it is judged that the sensors 20-1, 20-2 operated normally, and transmits an abnormal signal to a transmitting part 15. Besides, if the control part 14 is left as it receives the signal showing that the current does not flow from the current detecting parts 11-1, 11-2, it decides that the wiring to the sensors 20-1, 20-2 was disconnected, and it does not transmit the abnormal signal to the transmitting part 15. Thus, the false alarm can be prevented, and the early detection and the restoration of the disconnection trouble is possible.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an inspector terminal device.

[Conventional technology]

Conventionally, this type of inspector terminal device has come to judge that the state where the wiring to the sensor is broken and the state where the contact of the sensor is broken are the same state.

[Problem to be solved by the invention]

The conventional security terminal device described above is designed to judge that the state where the wiring to the sensor is broken and the state where the contact of the senna is broken are the same state, so if the wiring to the senna is broken, A sensor that considers a state where the contact is broken as normal always judges it as normal, and may not send an alarm even though the contact is closed and the sensor detects an abnormality, or the state where the contact is closed is considered normal. Sensors that do this have the disadvantage of transmitting false alarms.

[Means to solve the problem]

An inspector terminal device of the present invention is an inspector terminal device that sends abnormal signals from a plurality of types of sensors for detecting fire, intrusion, etc. to a center via a telephone line, etc. The plurality of types of senna are composed of at least one fire.

The inspector transmitter has a contact that operates when an intrusion is detected, and a rectifying element connected in parallel with the contact, and the inspector transmitter includes current supply means for passing current through the contacts of the plurality of types of sensors; a polarity reversing means for reversing the polarity of the current flowing from the means to the contact; a current detecting means for detecting whether or not current is flowing to the contact; and determining an abnormality based on a signal from the current detecting means and sending an abnormal signal to the center. and a transmitting means for transmitting.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention.

In FIG. 1, this embodiment is a sensor 20-1, 20-2
and a security transmitter 10, and a sensor 20-
1.20-2 is composed of a contact 21-1.21-2 and a diode 22-1.22-2, and the contact 21-1.21
-2 and the diode 22-1.22-2 are connected in parallel, and the contact 21-1.22-2 breaks when an abnormality is detected. The inspector transmitting device 10 has a current detecting section 11-1.1.
1-2, a power supply 12, a relay 13, a control unit 14,
The transmitter 15 includes a transmitter 15 and the like. Current detection section 11-
1.11-2 detects whether or not current is flowing through the sensor 20-1.20-2, and transmits a detection signal to the control unit 14. The power source is connected to the sensor 20-1 through the relay contact 13-a and the current detection section 11-1.
Supply power to 2o-2. The relay 13 is operated by a signal from the control unit 14, and as a result, the polarity of the power supplied to the sensor 20-1, 22-2 is reversed by the relay contact 13-a. The transmitter 15 transmits the abnormality signal from the controller 14 to a center (not shown) via a telephone line.

Next, the operation of this embodiment will be explained.

In the initial state, "relay contact 13-a and contact 21-1.
It is assumed that 21-2 is in the state shown by the solid line.

First, when the control unit 14 receives a signal from the current detection unit 11-1. The sensor 2o-1 is placed in the state shown by the broken line.
The polarity of the current supplied to 2o-2 is reversed, and if a signal indicating that current is flowing from the current detection section 11-1.11-2 is received, the sensors 20-1.20 to 2 have operated normally. It is determined that this is the case, and an abnormality signal is transmitted to the transmitter 15.

If the control unit 14 continues to receive a signal indicating that no current is flowing from the current detection unit 11-1, 11-2 with the polarity of the power supply 12 reversed, the sensor 2o-1,
The transmitter 15 determines that the wiring to the controller 20-2 is disconnected and does not transmit the abnormality signal to the transmitter 15. The transmitter 15 transmits the abnormality signal from the controller 14 to the center via the telephone line.

In this embodiment, the contacts 21 to 2 of the sensors 2o-1 and 20-2
1.21-2 is a contact that breaks when an abnormality is detected, but if the contact is made when an abnormality is detected, the relay 13 should be operated periodically and the polarity of the power supply 12 should be periodically reversed. By letting the sensor 20-1.20
It is possible to determine whether -2 is operating normally or the wiring is broken.

〔Effect of the invention〕

As explained above, the present invention reverses the polarity of the current supplied to multiple types of sensors so that it can be determined whether the sensor is operating normally or whether the wiring to the sensor is disconnected. This has the effect of not only preventing false alarms but also being able to detect and restore disconnection faults at an early stage.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention. 10... Security transmitter, 11-1.11-2... Current detection section, 12... Power supply, 13... Relay, 13-
a...Relay contact, 14...Control unit, 15...Transmission unit, 20-1.20-2...Sensor, 21-1.2
1-2... Contact, 22-1.22-2... Diode. tsu・/l・ノrumor 12. ．． of

Claims (1)

[Claims] An inspector terminal device that sends abnormal signals from a plurality of types of sensors for detecting fire, intrusion, etc. to a center via a telephone line etc., comprising the plurality of types of sensors and a security transmitter, wherein the plurality of types of sensors has at least a contact that operates when a fire or intrusion is detected, and a rectifying element connected in parallel with this contact, and the inspector transmitting device has current supply means for passing current through the contacts of the plurality of types of sensors. and a polarity reversing means for reversing the polarity of the current flowing from the current supply means to the contact, a current detecting means for detecting whether or not current is flowing to the contact, and determining an abnormality based on a signal from the current detecting means. A security terminal device comprising: transmitting means for transmitting an abnormality signal to the center.