Video monitoring system control line fault monitoring circuit

Abstract

The utility model discloses a fault monitoring circuit for a control line of a video monitoring system. The fault monitoring circuit comprises a detection circuit, an indication circuit and a power supply, the detection circuit detects a line state and outputs an indication signal; the indicating circuit receives an indicating signal and displays a line state through a light-emitting diode; the power supply provides working direct-current power for the detection circuit and the indication circuit. The video monitoring system control line fault monitoring circuit is simple in structure, convenient to arrange, capable of being used after being connected and low in deployment cost; the fault monitoring circuit for the control circuit of the video monitoring system can monitor short circuit, open circuit and non-driving states of the circuit, is high in practicability, and can meet the on-line monitoring requirements in the installation, debugging and use processes of the control circuit of the video monitoring system.

Description

Technical Field

[0001] This invention belongs to the field of testing and diagnostic technology, and in particular to a fault monitoring circuit for control circuits in a video surveillance system. Background Technology

[0002] The video surveillance system uses a control bus (RS485 bus) to control the video cameras. Operation commands include a series of functions such as zoom, aperture, shutter speed, call, and intercom. Through the control bus, the video surveillance system host can remotely control the cameras. A single video surveillance system can be configured with dozens or even over two hundred surveillance cameras. If the control bus fails, such as due to a short circuit, all cameras will become unresponsive. Therefore, during the installation, commissioning, and use of the video surveillance system, it is necessary to monitor the control bus lines online and provide real-time status indications. Summary of the Invention

[0003] The purpose of this invention is to address the problems existing in the prior art by providing a video surveillance system control circuit fault monitoring circuit that is simple in structure, ready to use, has low deployment cost, and is highly practical.

[0004] The technical solution for achieving the objective of this invention is as follows: a fault monitoring circuit for control lines in a video surveillance system, characterized in that the circuit includes a detection circuit, an indicator circuit, and a power supply. The detection circuit detects the line status and outputs an indicator signal; the indicator circuit receives the indicator signal and displays the line status through a light-emitting diode; the power supply provides DC power for the operation of the detection circuit and the indicator circuit.

[0005] Furthermore, the detection circuit uses an ISL3280E chip. Pin 5 of the ISL3280E chip is connected to the control bus A terminal of the video surveillance system via a wire, pin 4 of the ISL3280E chip is connected to the control bus B terminal of the video surveillance system via a wire, pin 3 of the ISL3280E chip is output as an indication signal to the indication circuit, pin 1 of the ISL3280E chip is connected to the positive terminal of the power supply, and pin 2 of the ISL3280E chip is connected to the negative terminal of the power supply.

[0006] Furthermore, the indicating circuit employs a monostable multivibrator SN74121. Pin 3 of the SN74121 receives the indicating signal output from the detection circuit; pins 4 and 5 are connected to the positive power supply; pin 6 is connected to a light-emitting diode; a timing parameter adjustment capacitor is connected between pins 10 and 11; a timing parameter adjustment resistor is connected between pins 11 and 14; and pin 14 is connected to the positive power supply. Based on the user's final requirements, the timing parameter adjustment capacitor and resistor are appropriately selected, and the pulse width output from pin 6 is controlled between 3 and 28 seconds.

[0007] Compared with existing technologies, the present invention has the following significant advantages: 1) It provides an online monitoring method, with the circuit directly connected to the control bus to display the line's operating status in real time; 2) It has a simple structure, is easy to use, and is plug-and-play with low cost; 3) It can monitor line short circuits, open circuits, and no-drive states, making it highly practical.

[0008] The present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0009] Figure 1 This is a block diagram illustrating the application of a fault monitoring circuit in a video surveillance system control line in one embodiment.

[0010] Figure 2 This is a block diagram of a fault monitoring circuit for a video surveillance system control line in one embodiment.

[0011] Figure 3 This is a block diagram of the detection circuit in one embodiment.

[0012] Figure 4 This is a block diagram of an indicator circuit in one embodiment. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0014] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0015] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0016] In one embodiment, Figure 1This is an application block diagram of the control line fault monitoring circuit in the video surveillance system of the present invention. The control line fault monitoring circuit is connected to the control bus of the video surveillance system via wires and displays the line status via indicator lights. When the control bus transmits data, such as control commands or periodic heartbeat messages, the LED of the control line fault monitoring circuit lights up; if there is a line fault (short circuit, open circuit) or no drive on the line, the LED does not light up.

[0017] In one embodiment, Figure 2 This is a block diagram of the control line fault monitoring circuit of the video surveillance system of the present invention. The control line fault monitoring circuit includes a detection circuit, an indicator circuit, and a power supply. The detection circuit detects the line status and outputs an indicator signal; the indicator circuit receives the indicator signal and displays the line status through an LED; the power supply provides DC power for the operation of the detection circuit and the indicator circuit, and uses dry cell batteries for easy use and replacement.

[0018] In one embodiment, Figure 3 The diagram shows the detection circuit of this invention. The detection circuit uses an ISL3280E chip. Pin 5 of the ISL3280E chip is connected to the control bus A terminal of the video monitoring system via a wire. Pin 4 of the ISL3280E chip is connected to the control bus B terminal of the video monitoring system via a wire. Pin 3 of the ISL3280E chip outputs an indication signal to the indication circuit. Pin 1 of the ISL3280E chip is connected to the positive terminal of the power supply, and pin 2 of the ISL3280E chip is connected to the negative terminal of the power supply.

[0019] In one embodiment, Figure 3 The diagram shows the indicator circuit of this invention. The indicator circuit uses a monostable multivibrator SN74121. Pin 3 of the SN74121 receives the indicator signal output from the detection circuit. Pins 4 and 5 are connected to the positive power supply. Pin 6 is connected to a light-emitting diode (LED). A time parameter adjustment capacitor is connected between pins 10 and 11, and a time parameter adjustment resistor is connected between pins 11 and 14. Pin 14 is connected to the positive power supply. The time parameter adjustment capacitor and resistor are selected appropriately according to the user's final requirements, and the pulse width output from pin 6 is controlled between 3 and 28 seconds.

[0020] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention without departing from its spirit and scope should be included within the protection scope of the present invention.

Claims

1. A fault monitoring circuit for control lines in a video surveillance system, characterized in that, The circuit includes a detection circuit, an indicator circuit, and a power supply; the detection circuit detects the line status and outputs an indicator signal; the indicator circuit receives the indicator signal and displays the line status through a light-emitting diode; the power supply provides DC power for the operation of the detection circuit and the indicator circuit.

2. The video surveillance system control circuit fault monitoring circuit according to claim 1, characterized in that, The detection circuit uses the ISL3280E chip. Input pin 5 of the ISL3280E chip is connected to the control bus A terminal of the video monitoring system via a wire. Input pin 4 of the ISL3280E chip is connected to the control bus B terminal of the video monitoring system via a wire. Pin 3 of the ISL3280E chip is output as an indication signal to the indication circuit. Pin 1 of the ISL3280E chip is connected to the positive terminal of the power supply, and pin 2 of the ISL3280E chip is connected to the negative terminal of the power supply.

3. The video surveillance system control circuit fault monitoring circuit according to claim 1, characterized in that, The indicator circuit uses a monostable multivibrator SN74121. Pin 3 of the SN74121 receives the indicator signal output by the detection circuit. Pins 4 and 5 are connected to the positive terminal of the power supply. Pin 6 is connected to the light-emitting diode. A time parameter adjustment capacitor is connected between pins 10 and 11. A time parameter adjustment resistor is connected between pins 11 and 14. Pin 14 is connected to the positive terminal of the power supply.

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