CN201532612U - Controlled end of digital type KVM switcher - Google Patents
Controlled end of digital type KVM switcher Download PDFInfo
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- CN201532612U CN201532612U CN200920131191XU CN200920131191U CN201532612U CN 201532612 U CN201532612 U CN 201532612U CN 200920131191X U CN200920131191X U CN 200920131191XU CN 200920131191 U CN200920131191 U CN 200920131191U CN 201532612 U CN201532612 U CN 201532612U
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Abstract
The utility model discloses a controlled end of a digital type KVM switcher, wherein the outer shape of the controlled end is a wedge shape, the front end is provided with a D-subVGA plug and can be directly connected on a D-sub VGA interface of a computer main machine, and the rear end is provided with a RJ45 interface with an LED indicating lamp, can be connected with a KVM main control end through a CAT5 network cable, and indicates the communication state. A PS/2 connecting wire is leaded out by the controlled end, thereby being capable of being used to transport keyboard and mouse signals, and further being used as an upgrade interface of device firmware simultaneously. The device further supports DDC2B communication of VGA, and simulates a plug and play display. The controlled end of the digital type KVM switcher has the advantages of small and exquisite outer shape and simple and convenient mounting and debugging, and the upgrading operation of firmware do not need to connect wires additionally, and can match with a main machine operating system to set reasonable video resolution.
Description
Technical field
The utility model relates to a kind of KVM computer switch device, relates in particular to the digital KVM switch that a kind of CAT5 of employing netting twine connects KVM main control end and controlled end.
Background technology
In recent years, computer application has been deep into the every aspect of people's life.In the face of the calculation task that becomes increasingly complex, just need the collaborative work of more and more computing machines just can finish.For example, in central office or data center, often need to have disposed hundreds of even several thousand computing machines; Even general family all might dispose the computing machine more than three.In general, each computing machine all need to dispose one the cover peripherals (keyboard, display, mouse) could be controlled by the keeper.Not only invest hugely, take up room, and the keeper often to shuttle back and forth between each computing machine, very inconvenient.KVM computer switch (KVMSwitch) is used for the key equipment of head it off just.Be aggregated into KVM by the input/output signal with every computing machine, the user only uses one group of keyboard, display, mouse, just can control these computing machines.When needs switching signal circuit, only need click the select switch on the KVM, promptly changeablely remove to monitor another computing machine.
Tradition KVM equipment adopts " three doublings " (lashing wire of keyboard, display, mouse) to connect host computer and KVM equipment.But the wire rod price of three doublings is higher, and signal attenuation is very fast, and transmission range is no more than 20 meters.Because the joint of three doublings is more, the wiring broad, for the KVM switch of supporting more than 16 tunnel, the total diameter of its three doubling can reach more than 10 centimetres, and wire rod is big and heavy, and is entangled to each other easily, seems disorderly and unsystematic, brings very big inconvenience to use.Digital KVM is by adding the controlled end equipment of small-sized KVM every computing machine rear end, the signal of keyboard, display, mouse is converted into differential signal, be connected with KVM switch (being the KVM main control end) with the CAT5 netting twine and communicate, thereby replace three traditional doubling connected modes.Because the netting twine low price, xsect is less, and every operation circuit only needs a netting twine, and signal transmission distance can reach more than 150 meters, greatly reduces the difficulty of machine room wiring.
More little being convenient to more of the volume of the controlled end of digital KVM installed, and can provide more additional function simultaneously, and this is the developing direction of the controlled end of present digital KVM.Often volume is bigger than normal for the controlled end of existing digital KVM, and adopts the video trace of drawing to go to connect VGA output, and the connection status of controlled end and main control end is difficult to learn that if link is obstructed, the keeper is difficult to decision problem and goes out at which end.In addition, all need to take equipment apart or need additional interface and line during the each firmware updating of the controlled end of existing digital KVM, very inconvenient.
Summary of the invention
The purpose of this utility model is to overcome the shortcoming and defect of above-mentioned prior art, a kind of controlled end of digital KVM switch is provided, its profile is small and exquisite, can be directly connected in the D-sub VGA interface of host computer, no longer need the display connecting line, Installation and Debugging are easy, and link state indicator is arranged, firmware upgrade operation need not extra wiring, also can cooperate host operating system to set rational video resolution.
The technical scheme that the utility model adopted is:
A kind of controlled end of digital KVM switch, have and the keyboard of host computer, the PS/2 interface that mouse interface links to each other, has the RJ45 interface that is connected with the KVM main control end by the CAT5 netting twine, it is characterized in that: have D-sub VGA interface, can directly connect the D-sub VGA interface of host computer; Have control circuit, described control circuit comprises microcontroller MCU, video difference subdivision and control signal difference unit; Described microcontroller MCU is connected with described video difference subdivision, described control signal difference unit, described PS/2 interface, described RJ45 interface and described D-sub VGA interface, be used to coordinate the work of other modules, and can simulate the plug and play display to host computer passback EDID sign indicating number by described D-sub VGA interface; Described video difference sub-module is three differential amplifiers corresponding to three kinds of signals of RGB; Described control signal difference block is the RS232-RS485 protocol conversion circuitry.
Wherein, in controlled end, the connecting line of described PS/2 interface is connected in the pin that has general input and output and programing function on the described microcontroller MCU simultaneously, can be used for controlled end firmware upgrade.
Described RJ45 interface has pilot lamp, and described control chip has line detection module, and the pilot lamp of controlling described RJ45 interface shows the connection status of controlled end and KVM main control end.Described RJ45 interface indicator can be 2 LED light.
The corresponding stitch that is used for the DDB2C communication on the I2C communication pin of described microcontroller MCU and the described D-sub VGA interface is connected, and described microcontroller MCU simulates the plug and play display by described I2C communication pin to host computer passback EDID sign indicating number.
Wherein, controlled end profile is a wedge shape, and described D-sub VGA plug is positioned at the front end of controlled end, and described RJ45 interface is positioned at the rear end of controlled end.The wedge length of controlled end profile is 71mm, and the rear end is of a size of 22mm * 18mm.
The utility model compared with prior art has the following advantages and beneficial effect:
Controlled end is very small and exquisite, and it has the D-sub VGA interface that can be directly connected in host computer, no longer needs the display connecting line, and is easy for installation.Whether whether the LED lamp on the controlled end RJ45 interface indicates equipment and powers on, and communicate by letter normally with main control end, for the Installation and Debugging of KVM deployed with devices are provided convenience.Controlled end no longer needs extra particular interface and line to finish the upgrading of MCU firmware simultaneously, but directly links to each other with downloader by two PS/2 connecting lines, thereby makes profile more attractive in appearance, and it is more convenient to upgrade, and production cost also is reduced.The MCU emulation of this controlled end the partial function of plug and play display, thereby when main frame identification display configuration information, can cooperate better with it, be convenient to host operating system and select and set optimal video resolution and refresh rate.
Description of drawings:
Fig. 1 is the appearance assumption diagram of the controlled end of digital KVM switch in the utility model.
Fig. 2 is the inner structure synoptic diagram of the controlled end of digital KVM switch in the utility model.
Fig. 3 is the functional module graph of a relation of the controlled end of digital KVM switch in the utility model.
Embodiment:
With the controlled end main body control circuit package of digital KVM switch in the plastic casing of a wedge shape.The D-subVGA plug of profile front end can directly be inserted on the VGA output interface of host computer.The rear end is the RJ45 interface with 2 LED light, connects the CAT5 netting twine.Controlled end is drawn two PS/2 connecting lines, is used to connect the mouse and the keyboard interface of host computer.In controlled end inside, a control circuit is arranged, comprise microcontroller MCU, video difference subdivision, control signal difference unit.The DATA of every PS/2 connecting line and CLOCK all are connected on the pin of general input and output/programmable multiplex of MCU.One of two LED light of RJ45 interface are connected between power supply and the ground, the indication power-up state; Another is connected on two general input and output pins of MCU, is used to indicate the availability of link.Because the KVM main control end can be given controlled end by periodic transmit status query statement, so controlled end MCU can judge whether link is normal by verifying this message, and then the light and shade of control LED is come indicating status.The DDC DATA of VGA and DDC CLOCK stitch are connected on respectively on the I2C DATA and I2C CLOCK pin of MCU, simultaneously at the inner DDC2B communication function of realizing of MCU.When the main frame video card passed through DDC2B query display device state, MCU can simulate the plug and play display by passback EDID sign indicating number.
Surface structure of the present utility model such as Fig. 1, front end are the D-subVGA interface 2 of standard, and the rear end is a RJ45 interface 1, and two LED light 5 are arranged above.PS/2 connecting line 3 is drawn from the side of shell.Interface set bolt 4 is through VGA interface both sides.The whole wedgewise of shell, length is 71mm (not containing VGA interface extension elongation), the rear end shell sizes is 22mm * 18mm.The end of PS/2 connecting line is told two joints, respectively corresponding keyboard PS/2 interface and mouse PS/2 interface.
The D-sub VGA interface 2 of the controlled end of KVM directly is inserted on the VGA output interface of computing machine in use, and two PS/2 joints are connected on the corresponding PS/2 interface of computing machine.Link to each other with main control end with the RJ45 interface of CAT5 netting twine controlled end.
Fig. 2 is the cut-away view of controlled end.Wherein RJ45 interface 1, D-sub VGA interface 2, PS/2 connecting line 3, interface set bolt 4 correspond respectively to the parts of same numeral among Fig. 1.Plastic casing loam cake 8, lower cover 9 adopt the mode of splicing up and down to encapsulate internal circuit.In order to reduce controlled end volume as far as possible, be that two circuit boards pile up with circuit design, the mode of contact pin communication between backup plate.The circuit board 5 main difference of being responsible for vision signal, the transmission that reaches video, control differential signal receives, and circuit board 6 is used to connect each stitch of VGA interface, on the circuit board 7 microcontroller is arranged, and is responsible for processing control signals, the work of each module on the Conforming Elements for Plate Bending Problems.
Fig. 3 is the functional module graph of a relation of controlled end, and arrow has been indicated the transmission direction of signal among the figure.MCU is a microcontroller, is used for coordinating the work of other modules.The video difference sub-module is 3 differential amplifiers, three kinds of signals of corresponding RGB.The control signal difference block is the RS232-RS485 protocol conversion circuitry.The redgreenblue signal of the input of VGA interface outputs to the RJ45 interface after importing the modulation of video difference sub-module into.The DDC DATA of VGA interface and DDC CLOCK stitch are connected on respectively on the I2C DATA and I2C CLOCK pin of MCU, are used for carrying out DDC2B communication.The DATA of every PS/2 connecting line and CLOCK all are connected on the pin of general input and output/programmable multiplex of MCU, transmission PS/2 protocol signal.When needs carried out DFU, these two lines also can be used to do programming burning connecting line.The video difference sub-module can send to MCU to the HSync/VSync polarity behind the coding so that generate control signal.MCU integrates all control signals, by sending to the RJ45 interface after the modulation of control signal difference block.In addition, one of two LED light of RJ45 interface are connected between power supply and the ground, the indication power-up state; Another is connected on two general input and output pins of MCU, indicates the availability of link by the MCU control level.
The above only is preferred embodiment of the present utility model, not in order to restriction the present invention, all any modifications of being done within spirit of the present utility model and principle, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. the controlled end of a digital KVM switch, have and the keyboard of host computer, the PS/2 interface that mouse interface links to each other, has the RJ45 interface that is connected with the KVM main control end by the CAT5 netting twine, it is characterized in that: have D-sub VGA interface, can directly connect the D-sub VGA interface of host computer; Have control circuit, described control circuit comprises microcontroller MCU, video difference subdivision and control signal difference unit; Described microcontroller MCU is connected with described video difference subdivision, described control signal difference unit, described PS/2 interface, described RJ45 interface and described D-sub VGA interface, be used to coordinate the work of other modules, and can simulate the plug and play display to host computer passback EDID sign indicating number by described D-sub VGA interface; Described video difference sub-module is three differential amplifiers corresponding to three kinds of signals of RGB; Described control signal difference block is the RS232-RS485 protocol conversion circuitry.
2. the controlled end of digital KVM switch according to claim 1, it is characterized in that: in controlled end, the connecting line of described PS/2 interface is connected in the pin that has general input and output and programing function on the described microcontroller MCU simultaneously, can be used for controlled end firmware upgrade.
3. the controlled end of digital KVM switch according to claim 1 and 2, it is characterized in that: described RJ45 interface has pilot lamp, described control circuit has line detection module, and the pilot lamp of controlling described RJ45 interface shows the connection status of controlled end and KVM main control end.
4. the controlled end of digital KVM switch according to claim 1 and 2, it is characterized in that: the corresponding stitch that is used for the DDB2C communication on the I2C communication pin of described microcontroller MCU and the described D-sub VGA interface is connected, described microcontroller MCU has the DDC2B communication function, can simulate the plug and play display to host computer passback EDID sign indicating number by described I2C communication pin.
5. the controlled end of digital KVM switch according to claim 1 and 2 is characterized in that: controlled end profile is a wedge shape, and described D-sub VGA plug is positioned at the front end of controlled end, and described RJ45 interface is positioned at the rear end of controlled end.
6. the controlled end of digital KVM switch according to claim 5 is characterized in that: the wedge length of controlled end profile is 71mm.
7. the controlled end of digital KVM switch according to claim 5 is characterized in that: controlled end rear end is of a size of 22mmx18mm.
8. the controlled end of digital KVM switch according to claim 3 is characterized in that: described RJ45 interface indicator is 2 LED light.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920131191XU CN201532612U (en) | 2009-05-08 | 2009-05-08 | Controlled end of digital type KVM switcher |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920131191XU CN201532612U (en) | 2009-05-08 | 2009-05-08 | Controlled end of digital type KVM switcher |
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| Publication Number | Publication Date |
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| CN201532612U true CN201532612U (en) | 2010-07-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200920131191XU Expired - Fee Related CN201532612U (en) | 2009-05-08 | 2009-05-08 | Controlled end of digital type KVM switcher |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103294633A (en) * | 2012-02-23 | 2013-09-11 | 锋厚科技股份有限公司 | Universal sequence bus switcher |
| CN104503594A (en) * | 2014-12-16 | 2015-04-08 | 中国科学院长春光学精密机械与物理研究所 | PS/2 keyboard-mouse remote switching system |
| CN104503595A (en) * | 2014-12-16 | 2015-04-08 | 中国科学院长春光学精密机械与物理研究所 | PS/2 keyboard-mouse switching device |
| CN108762520A (en) * | 2015-06-08 | 2018-11-06 | 周立刚 | A kind of working method of KVM extenders transmitting terminal |
| CN111316510A (en) * | 2017-11-09 | 2020-06-19 | 维谛信息技术系统有限公司 | Self-contained KVM extender within video connector |
-
2009
- 2009-05-08 CN CN200920131191XU patent/CN201532612U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103294633A (en) * | 2012-02-23 | 2013-09-11 | 锋厚科技股份有限公司 | Universal sequence bus switcher |
| CN103294633B (en) * | 2012-02-23 | 2016-03-16 | 锋厚科技股份有限公司 | Universal serial bus switch |
| CN104503594A (en) * | 2014-12-16 | 2015-04-08 | 中国科学院长春光学精密机械与物理研究所 | PS/2 keyboard-mouse remote switching system |
| CN104503595A (en) * | 2014-12-16 | 2015-04-08 | 中国科学院长春光学精密机械与物理研究所 | PS/2 keyboard-mouse switching device |
| CN108762520A (en) * | 2015-06-08 | 2018-11-06 | 周立刚 | A kind of working method of KVM extenders transmitting terminal |
| CN111316510A (en) * | 2017-11-09 | 2020-06-19 | 维谛信息技术系统有限公司 | Self-contained KVM extender within video connector |
| CN111316510B (en) * | 2017-11-09 | 2022-09-23 | 维谛信息技术系统有限公司 | Apparatus for forming an interface and method for interfacing a remote access tool to a target device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| DD01 | Delivery of document by public notice |
Addressee: Shen Lei Document name: Notification to Pay the Fees |
|
| DD01 | Delivery of document by public notice |
Addressee: Zou Chao Document name: Notification of Termination of Patent Right |
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| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100721 Termination date: 20110508 |