JPH0371298A - Guard terminal equipment - Google Patents

Abstract

PURPOSE:To prevent the generation of misinformation by providing the guard terminal equipment with a current supplying means for supplying current to plural sensors in the previously set order to judge whether wirings to respective sensors are in contact with each other or short-circuited or not. CONSTITUTION:If wirings to the sensors 20-1, 20-2 are normal when the sensors 20-1, 20-2 detect no abnormality and contacts are made, a signal indicating a current flow from a current detecting part 11-1 and a signal indicating no current flow from a current detecting part 11-2 are inputted to a control part 14 at the time of driving a relay 13-1 and the control part 14 judges the normal state. If the points A, B e.g. of the wiring to the sensors 20-1, 20-2 are short- circuited, a signal indicating current flows from both the detecting parts 11-1, 11-2 is inputted to the control part 14 at the time of driving the relay 13-1 and the control part 14 judges the existence of abnormality in the wiring to the sensors 20-1, 20-2 and transmits an abnormal signal to a transmission part 15. Consequently, the generation of misinformation can be prevented.

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 been configured to constantly supply current to the contacts of the sensor, detect the presence or absence of current flowing through the contacts of the sensor, and determine the operating state of the sensor.

[Problem to be solved by the invention]

The conventional security terminal device described above is configured to constantly supply current to the sensor contacts and determine the operating state of the sensor by detecting the presence or absence of current flowing through the sensor contacts. If the sensor is connected and short-circuited, in the case of a sensor with normally closed contacts, even if one sensor operates and the contact opens, current flows to the contact of the other sensor and detects the operating status of one sensor. If this is not possible, or if the sensor has a normally open contact, current will flow and it will be determined that the sensor is operating, even though the sensor is not operating.
It has the disadvantage of sending 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 sensors for detecting at least fire and intrusion to a center via a communication line, and is configured of a plurality of sensors and a security transmitter, Each sensor has at least a contact that operates when a fire or intrusion is detected, and the security transmitter includes current supply means for supplying current from a power source to the contacts of each sensor in a preset order; The sensor includes current detecting means for detecting whether current is flowing to the contact point of the sensor, and signal sending means for determining an abnormality based on a signal from the current detecting means and sending an abnormal signal to the center via the communication line. are doing.

〔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 10.

Sensors 20-1 and 20-2 each have a contact that breaks when an abnormality such as fire or intrusion is detected, and relay contacts 13-1a and 13-2a and current detection unit 11-1 are connected to power supply 12 of security transmitter 10. .11-2.

The security transmitter 10 includes a current detection section 11-1.11-2,
Power supply 12, relays 13-1, 13-2, and control unit 14
and a transmitting section 15, the current detecting section 1
1-1.11-2 detects whether current is flowing through the sensor 20-1.20-2 and sends a signal to the control unit 14, and the power supply 12 connects relay contacts 13-1a and 13-
2a and the current detection section 11-1.11-2, the power is supplied to the sensor 20-1.20-2, and the relay 13-1
．． 13-2 is operated by a signal from the control unit 14, and the sensor 20-1 is operated by relay contacts 13-1a and 13-2a.
．． 20-2, the control unit 14 operates the relays 13-1.13-2 in order, and determines an abnormality based on the signal from the current detection unit 11-1.11-2. , transmits an abnormal signal to the transmitter 15, and the transmitter 15 transmits the abnormal signal from the controller 14 to a center (not shown) via a telephone line.

Next, the operation of this embodiment will be explained.

When sensor 20-1.20-2 does not detect any abnormality and the contact is closed and the wiring to sensor 20-1.20-2 is normal, if relay 13-1 operates, the current A signal indicating that current is flowing is sent from the detection unit 11-1.
Further, a signal indicating that no current is flowing is input from the current detection section 11-2 to the control section 14, and the control section 14 determines that it is normal. In this state, for example, the sensor 20-1°20
If point A and point B of the wiring to -2 contact and short circuit, if relay 13-1 operates, current detection unit 11-1.11-
A signal indicating that current is flowing from both of the controller 14
The controller 14 determines that there is an abnormality in the wiring to the sensors 20-1 and 20-2, and transmits an abnormality signal to the transmitter 15.

In addition, if the wiring to sensors 20-1 and 20-2 is normal and the sensor 20-2 operates and the contact is broken, if the relay 13-1 operates, current will flow through the current detection unit 11-1. The current detection unit 11-2 transmits a signal indicating that no current is flowing to the control unit 14, and the control unit 14 determines that the sensor 20-1 is normal, and the relay 13-2 transmits a signal indicating that no current is flowing.
If sensor 20-2 operates, a signal indicating that no current is flowing from both current detection units 11-1 and 11-2 is input to the control unit 14, and the control unit 14 determines that the sensor 20-2 is operating. An alarm signal corresponding to the alarm detected by the sensor 20-2 is transmitted to the transmitter 15.

〔Effect of the invention〕

As explained above, the present invention has a current supply means that supplies current to a plurality of sensors in a preset order, so that it can be determined whether the wiring to each sensor is in contact or short-circuited. This has the effect of preventing false alarms and quickly detecting and restoring wiring failures to each sensor.

[Brief explanation of drawings]

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, 13-1.13-2...
Relay, 13-1a, 13-2a...Relay contact, 1
4...Control unit, 15...Transmission unit, 20-1.20-
2...Sensor.

Claims (1)

[Claims] A security terminal device that sends abnormal signals from a plurality of sensors that detect at least a fire or an intrusion to a center via a communication line. The security transmitting device includes a current supply means for supplying current from a power source to the contacts of each of the sensors in a preset order, and current flows to the contacts of each of the sensors. A security terminal device comprising: a current detecting means for detecting whether the current is being detected; and a signal transmitting means for determining an abnormality based on a signal from the current detecting means and transmitting an abnormal signal to a center via the communication line. .