CN2724115Y - Projector VGA broken line safety warning detector - Google Patents
Projector VGA broken line safety warning detector Download PDFInfo
- Publication number
- CN2724115Y CN2724115Y CN 200420063275 CN200420063275U CN2724115Y CN 2724115 Y CN2724115 Y CN 2724115Y CN 200420063275 CN200420063275 CN 200420063275 CN 200420063275 U CN200420063275 U CN 200420063275U CN 2724115 Y CN2724115 Y CN 2724115Y
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- China
- Prior art keywords
- projector
- vga
- signal
- plug
- unit
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- Expired - Fee Related
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- Burglar Alarm Systems (AREA)
Abstract
The utility model discloses a projector VGA broken line safety warning detector. A projector VGA signal loop is established, and the burglar-proof warning detection of the projector is carried out through the control system judging the power on and off of the loop. When illegal broken signal line of the projector occurs, the safety warning is automatically carried out, ensuring the safety of the projector under the open environment. The warning signals are transferred to the remote total control computer for warning through the network; when the projector is not fed, the loop detection is still effective, and the safety of the device is furthest protected. The utility model is composed of a JP1 plug-in unit connected with the VGA signal line of the projector, a triode Q1 and a JP2 plug-in unit connected with the safety warning device and outputting the safety warning signals. The projector VGA broken line safety warning detector is characterized in that the line foot of the JP1 plug-in unit which is mutually connected with the red signal ground and the blue signal ground in the VGA signal line is connected with the ground, the line foot of the JP1 plug-in unit which is mutually connected with the green signal ground in the VGA signal line is connected with the base electrode of the triode Q1, and is connected to the high level through a pull-up resistance R1; the collector electrode of the triode Q1 outputs the warning signal to the JP2 plug-in unit.
Description
Technical field:
The utility model is a kind of VGA of projector burn out detection and the device of realizing security alarm.
Technical background:
The application of projector in education sector is very extensive, and projector is fixedly mounted in the classroom mostly, and the classroom is an open place, thus support price relatively the safety of expensive projector be an important process of equipment control department.Way in the past is that the classroom that projector apparatus is installed is not open, uses by the personal management; Another kind of way is one so-called " Security case body " to projector to be installed, but above measure can not fundamentally solve the safe antitheft of projector.
Summary of the invention:
The utility model purpose is to disclose a kind of VGA of projector broken string security alarm pick-up unit.Be to set up the VGA of a projector signal circuit, and carry out the detection of the burglar alarm of projector by the on/off in control system judgement loop.When occurring illegally disconnecting the VGA signal wire of projector, can carry out security alarm automatically.Guarantee the safety of projector under open environment.Alerting signal is sent to by network on the overhead control computer of far-end and reports to the police; When projector did not power, the loop was detected still effective.Can protect device security to greatest extent.
Its composition of the utility model comprises: a JP1 plug-in unit that is connected with the VGA signal wire of projector, the JP2 plug-in unit that also comprises triode Q1 and the output security alarm signal that is connected with protection alarm device, it is characterized in that: the red signal ground of projector's one end of VGA signal wire and blue signal ground and green signal ground disconnect with ground, the stitch ground connection that the red signal ground with in the VGA signal wire of JP1 plug-in unit is connected with blue signal ground, the stitch that the green signal ground with in the VGA signal wire of JP1 plug-in unit is connected connects the base stage of triode Q1, and receive high level by pull-up resistor R1, the collector output alarm signal of triode Q1 is to the JP2 plug-in unit, when the VGA of projector signal disconnects, the stitch that the green signal ground with in the VGA signal wire of JP1 plug-in unit is connected is a high level, at this moment Q1 collector output low level " 0 "; The collector output of Q1 is sent alerting signal by JP2.
Description of drawings
Fig. 1 is the utility model embodiment electrical schematic diagram.
Embodiment:
Fig. 1 is the utility model embodiment:
Embodiment
The VGA signal wire of projector is defined as follows:
Pin one, 2,3,4,5,6,7,8,9-15 signal definition are red, green, blue, useless, useless, red signal ground, green signal ground, blue signal ground, (summary).Wherein, 6,7,8 pin link to each other in the VGA of projector inside seat.During installation, the VGA signal wire of projector is connected to this device earlier, and then is connected to the VGA signal source.In the VGA line between projector and this device, 6,7,8 pin do not link to each other mutually.In warning device one side, with 6,8 ground connection, 7 pin are received+the 5V high level by pull-up resistor.When the VGA of projector signal wire normally connected, 7 pin were low level by the ground connection that links to each other of 6,7,8 pin with 6,8 pin of device inside of projector inside; When the VGA of projector signal wire and projector's disconnection, 7 pin become high level by pull-up resistor.By the height of 7 pin level, judge the connection status of the VGA of projector signal wire, normal as malunion, then carry out security alarm automatically.
Among the figure, JP1 is that this device connects VGA socket of projector, 6,8 pin ground connection, 7 pin by on draw electricity group R1 to meet high level VCC, and be connected to the base stage of triode Q1, the collector output alarm signal of Q1.When the VGA of projector signal wire connects just often, 7 pin are low level, Q1 collector output this moment high level " 1 "; When the VGA of projector signal disconnected, 7 pin were high level, at this moment Q1 collector output low level " 0 "; The collector output of Q1 is sent alerting signal by JP2, realizes security alarm.
This device can detect the VGA signal wire of projector and the connection status of projector automatically, when occurring illegally disconnecting the VGA signal wire of projector, can carry out security alarm automatically.When the VGA line connects projection, signal forms the loop, when the VGA line breaks away from projection, signal circuit disconnects, control system is carried out the burglar alarm of projector by the on/off of judging the loop, and alerting signal is given on the overhead control computer that mixed-media network modules mixed-media is sent to far-end by the network interface of middle control and reported to the police; When projector did not power, the loop was detected still effective.
Claims (1)
1. the VGA of projector broken string security alarm pick-up unit, its composition comprises: a JP1 plug-in unit that is connected with the VGA signal wire of projector, the JP2 plug-in unit that also comprises triode Q1 and the output security alarm signal that is connected with protection alarm device, it is characterized in that: the red signal ground of projector's one end of VGA signal wire and blue signal ground and green signal ground disconnect with ground, the stitch ground connection that the red signal ground with in the VGA signal wire of JP1 plug-in unit is connected with blue signal ground, the stitch that the green signal ground with in the VGA signal wire of JP1 plug-in unit is connected connects the base stage of triode Q1, and receive high level by pull-up resistor R1, the collector output alarm signal of triode Q1 is to the JP2 plug-in unit, when the VGA of projector signal disconnects, the stitch that the green signal ground with in the VGA signal wire of JP1 plug-in unit is connected is a high level, at this moment Q1 collector output low level " 0 "; The collector output of Q1 is sent alerting signal by JP2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420063275 CN2724115Y (en) | 2004-08-13 | 2004-08-13 | Projector VGA broken line safety warning detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420063275 CN2724115Y (en) | 2004-08-13 | 2004-08-13 | Projector VGA broken line safety warning detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2724115Y true CN2724115Y (en) | 2005-09-07 |
Family
ID=35037738
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420063275 Expired - Fee Related CN2724115Y (en) | 2004-08-13 | 2004-08-13 | Projector VGA broken line safety warning detector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2724115Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102589608A (en) * | 2011-12-31 | 2012-07-18 | 东方通信股份有限公司 | Shift-out detection circuit |
-
2004
- 2004-08-13 CN CN 200420063275 patent/CN2724115Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102589608A (en) * | 2011-12-31 | 2012-07-18 | 东方通信股份有限公司 | Shift-out detection circuit |
| CN102589608B (en) * | 2011-12-31 | 2014-06-04 | 东方通信股份有限公司 | Shift-out detection circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |