JPH022787A - Guard terminal equipment - Google Patents

Abstract

PURPOSE:To prevent erroneous information from being issued and to detect the fault of short-circuit at early stages by discriminating the normal operation of a sensor and the short-circuit of wiring to the sensor by inverting the polarity of a power source supplied to the sensor. CONSTITUTION:A source power from the power source 12 is supplied to the sensor 12-1, etc., operated at the time of detecting abnormality via a relay contact 13-a, and the flow of current is detected at a power source detecting part 11-1. A control part 14 controls a relay 13 corresponding to detected output, and the connection of the contact 13-a is switched, and the polarity of the source power supplied to the sensor 12-1 is inverted. And when no flow of current is detected by the detecting part 11-1, the control part 14 decides the above state as the normal operation of the sensor 20-1, and when the flow of current is detected, it is decided as the short-circuit of the wiring to the sensor 20-1. The similar decision is performed on another sensor 20-2, etc., and it is possible to prevent the erroneous alarm information from being issued and to perform a counterpart processing by finding the short-circuit of the wiring at early stages.

Description

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

[Conventional technology]

Conventionally, this type of security terminal device has come to judge that a state in which the wiring to the sensor is short-circuited and a state in which the contact point of the sensor is made are the same state.

[Problem to be solved by the invention]

The conventional security terminal device mentioned above is designed to judge that the state where the wiring to the sensor is short-circuited and the state where the contact of the sensor is made are the same, so if the wiring is short-circuited to the sensor, The sensor always considers the state of the contact as normal when it is metered, and the state where the contact breaks and the sensor detects an abnormality but does not send an alarm, or the state where the contact breaks is considered normal. The disadvantage of such sensors is that they send false alarms.

[Means to solve the problem]

The security terminal device of the present invention is a security terminal device that sends abnormal signals from a plurality of types of sensors for detecting fire, intrusion, etc. to the sensor via a telephone line, etc. wherein the plurality of types of sensors are configured such that the plurality of types of sensors include contacts that operate when detecting at least a fire intrusion;
The security transmitter has a rectifying element connected in series with the contact, and the security transmitter includes a current supply means for supplying current to the contacts of the plurality of types of sensors, and a current supply means for supplying current to the contact from the current supply means. A polarity reversing means for reversing the polarity, a current detecting means for detecting whether a current is flowing to the contact, and a transmitting means for determining an abnormality based on a signal from the current detecting means and transmitting an abnormal signal to the center. have.

〔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 has sensors 20-1 and 20-2.
and a security transmitter lO, and the sensor 20-
1.20-2 is composed of a contact 21-1.21-2 and a diode 22-1.22-2, and the contact 2], -1, 21
-2, and diodes 22 1 and 22 2 are connected in series, and contacts 21-1 and 21-2 provide a meter when an abnormality is detected.

The security transmitter 10 includes current detection units 11 to 1.112, and
It is composed of a power source 12, a relay 13, and a transmitter 15. The current detection unit 11-1゜11-2 is the sensor 20
-1.20-2. The relay 13 is operated by a signal from the control unit 14, and as a result, the relay contact 13
-a reverses the polarity of the power supply to the sensor 20-1, 22-2. 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 21-1.2
It is assumed that 1-2 is in the state shown by the solid line.

First, when the control unit 14 receives a signal indicating that a current has flowed in the line from the current detection unit 11-1.11-2 to the sensor 20-1.20-2, it operates the relay 13 and closes the relay contact 13-a. The sensor 20-1.2 is placed in the state shown by the broken line.
The polarity of the current supplied to the sensor 20-1 and 20-2 is reversed, and if a signal indicating that no current is flowing is received from the current detection section 11-1 and 11-2, it is determined that the sensor 20-1 and 20-2 are operating normally. The determination is made and an abnormality signal is transmitted to the transmitter 15.

If the control unit 14 continues to receive a signal indicating that current is flowing through the current detection unit 11-1.11-2 with the polarity of the power supply 12 reversed, the sensor 20-1.2
When the wiring to 0-2 is short-circuited, the situation is reversed and no abnormal signal is transmitted to the transmitter 15.

The transmitter 15 transmits the abnormality signal from the controller 14 to the sensor via the telephone line.

In this embodiment, the t1 point 21 of the sensor 20-1, 20-2
-1.21-2 is a contact that is made when an abnormality is detected, but in the case of a contact that breaks when an abnormality is detected, the relay 13 is operated periodically and the polarity of the power supply 12 is changed periodically. By inverting the sensor 20-1.
It can be determined whether 20-2 is operating normally or whether the wiring is short-circuited.

〔Effect of the invention〕

As explained above, the present invention can detect false alarms by reversing the polarity of the power supplied to multiple types of sensors to determine whether the sensors are operating normally or whether the wiring to the sensors is short-circuited. This has the effect of not only preventing short-circuit failures but also enabling early detection and restoration of short-circuit failures.

[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"\1.l'

Claims (1)

[Claims] A security terminal device that sends abnormal signals from multiple types of sensors for detecting fire, intrusion, etc. to a center via a telephone line, etc., comprising the multiple types of sensors and a security transmitter, wherein the multiple types of sensors has at least a contact that operates when a fire or an intrusion is detected, and a rectifying element connected in series with the contact, and the security transmitter has current supply means for flowing current through the contacts of the plurality of types of sensors. ,
A locality 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. and transmitting means for transmitting an abnormality signal to the center.