CN1315032C - Bus type keyboard, display and mouse switching control apparatus and method - Google Patents
Bus type keyboard, display and mouse switching control apparatus and method Download PDFInfo
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- CN1315032C CN1315032C CNB2004100294815A CN200410029481A CN1315032C CN 1315032 C CN1315032 C CN 1315032C CN B2004100294815 A CNB2004100294815 A CN B2004100294815A CN 200410029481 A CN200410029481 A CN 200410029481A CN 1315032 C CN1315032 C CN 1315032C
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Abstract
The present invention relates to a bus type switching and controlling device for a keyboard, a displayer and a mouse and a method. The device comprises a bus which is composed of an analog signal bus and a digital signal bus, control end modules and a plurality of node control modules, wherein the control end modules are respectively hung on the bus and are connected with a mouse, a keyboard and a displayer, and the node control modules are connected with a server. The node control module is used for receiving the instructions of the control end modules and controlling the disconnection or the connection of nodes and the analog signal bus, and the node control module blockades or releases the connection of the display signals of a node server with the analog signal bus to make the realization that the display signals of the node server are transmitted from the nodes to control ends in a one-way transmission way. The device has the advantages of novel design and conception, simple circuit structure, reduced production cost and improved work reliability of a circuit. The present invention has good prospects of popularization and application in the application field that server groups which are selected and controlled through a plurality of server nodes share one set of keyboard, a displayer and a mouse to input or output.
Description
Technical field
The present invention relates to a kind of bus-type keyboard, display, mouse switching control and method, particularly relate to a kind of five class transmission lines that pass through, realize the switching control and the control method of the shared one group of keyboard of a plurality of server nodes, display, mouse, belong to the Computer Control Technology field.
Background technology
At present, the shared one group of keyboard of normally a plurality of server nodes, display, mouse in server group of planes application, utilize keyboard, display, mouse (KVM, Key-board Video Mouse) switch that inputing or outputing of each server selected control by control end again.Too complicated for fear of wiring, industry has been developed the switching device that adopts a category-5 cable transmission KVM signal.But, in the existing this bus-type KVM switch, the most more complicated of between each node, switching of control circuit structure; Especially the transmission requirement of simulating signal reduces waveform distortion as far as possible, so use the switching node of the little ambipolar analog switch of path stray capacitance as control circuit usually.Yet sort circuit has big defective: the one, and the cost costliness.Because the control switching circuit complex structure makes the device cost of circuit and manufacturing cost all can significantly increase.Single with regard to ambipolar analog switch wherein, because the parameters such as stray capacitance of its path are had higher requirements, make the cost up of this element, and then increased the cost of node.And in a group of planes was used, the system of a cover KVM switch control often needed up to a hundred nodes, and this element is just considerable to the influence that raises the cost.The 2nd, complicated control switching circuit has increased the fault origination point naturally, can increase the probability that fault occurs virtually, influences the job stability of system.
Summary of the invention
The purpose of this invention is to provide a kind of bus-type keyboard, display, mouse switching control and implementation method, this switching control is by a high level line and the controller area network bus transmission switching command that the low level line is formed, microprocessor by each node control module receives and analyzes order, drive the action of relevant hardware control circuit, simulating signal on the analog signal transmission bus is carried out switching controls, thereby simplify commutation circuit greatly, reduce production costs and improve the functional reliability of circuit.
The object of the present invention is achieved like this: a kind of bus-type keyboard, display, the mouse switching control, it is characterized in that: this device includes bus, be articulated in a control end module and a plurality of node control module on this bus respectively, described bus includes analog signal transmission bus and digital data transmission bus, described control end module is connected with mouse, keyboard and display, described node control module connects each server respectively, be used to receive the order of control end module, control the disconnection or the closure of this node and analog signal bus, blocking-up or discharge being connected of server shows signal that this node connects and analog signal bus is so that the shows signal of the server of this node connection can realize by the one-way transmission of this node to control end; The control circuit of described node control module comprises: the digital circuit of being made up of the RJ45 interface of the PS/2 interface of microprocessor and its peripheral circuit-bus transceiver, keyboard and mouse and digital signal thereof, the video graphics adapter VGA interface that is linked in sequence, vision signal is carried out the mimic channel that the RJ45 interface of the circuit of compound packing and differential transfer circuit, relay switching circuit and relay, vision signal is formed, and power converting circuit, node duty indicating circuit, reset circuit and mouse, keyboard read-write control circuit.
The function of the microprocessor in the described node control module control circuit is: in working order down, will be via the processing of packing of mouse, the keyboard signal of this node server of PS/2 interface, control the bus transceiver that its TX/RX interface connects and communicate by letter with control end by digital signal bus; Under standby mode, respond the order of server, i.e. the mouse of emulation server and keyboard; By its I/O interface pilot relay on-off circuit work, make under mode of operation, the relay adhesive, the shows signal of this node server is discharged on the analog signal transmission bus, realizes by the one-way transmission of this node to control end; Under standby mode, cut-off, the shows signal transmission of this node server is blocked.
The circuit structure of described control end module is identical with the node control module, to reduce type of modules.
Described digital signal bus and analog signal bus are category-5 cables, wherein digital signal bus is by a high level line and the controller area network bus that the low level line is formed, analog signal bus is made up of three pairs of twisted-pair feeders that transmit R+H, G, B+V video display signal respectively, wherein the every pair of twisted-pair feeder transmits the bipolar signal of positive negative level, and the two ends of digital signal bus and analog signal bus are connected in series the build-out resistor that forms good termination respectively.
Described category-5 cable connects two RJ45 interfaces between control end module and each node control module adjacent one another are respectively, constitutes the physical transmission medium of digital signal bus and analog signal bus.
Described relay construction is the dpdt double-pole double-throw (DPDT) type, three relays are arranged on each node control module, control the disconnection or the closure of the bipolar signal transfer bus of three display simulation signals respectively, in order to blocking-up or discharge the server shows signal of this node and being connected of analog signal transmission bus;
The object of the present invention is achieved like this: the control method of a kind of bus-type keyboard, display, mouse switching control is characterized in that comprising the following steps:
(1) the control end module is sent the closed relay instruction by number bus all node control modules before the purpose node server that needs are controlled alternately;
(2) microprocessor of described each node control module receives out code, closes relay separately respectively, and enters standby mode;
(3) the purpose node control module controlled alternately to needs by digital signal bus of control end module is sent the relay OPEN;
(4) microprocessor of purpose node control module receives OPEN, and the adhesive of order relay makes the server shows signal of this website connect analog signal bus, and enters mode of operation;
(5) flow process that switches to the purpose node finishes.
Described standby mode is the order that the microprocessor of this node control module is only monitored digital signal bus, not to bus sending information; Start mouse, keyboard simulation program simultaneously, the mouse of virtual server, keyboard make server can detect mouse, keyboard operate as normal.
To be the microprocessor of this node control module set up Virtual Path to described mode of operation between the mouse of this node server and control end, keyboard, realizes communicating by letter between this server and mouse, the keyboard; Simultaneously, the shows signal of this node server is discharged on the analog signal bus, realizes by the one-way transmission of this node server to the control end display.
The present invention is divided into the bus of two kinds of difference in functionalitys by the transmission line that is made of Category-5 twisted pair: the analog signal bus of the digital signal bus of switching command between transmission node and mouse, keypad information and transmitting and displaying simulating signal, and the microprocessor on each node control module and its peripheral control circuit, realized only needing a category-5 cable just can transmit keyboard, display, mouse signal simultaneously.Whole Design of device is novel ingenious, and circuit structure is simple, and especially commutation circuit is simplified greatly, significantly reduces manufacturing cost, has also improved the functional reliability of circuit.Input or output in the server group of planes application of selecting control at a plurality of server nodes shared one group of keyboard, display, mouse, the present invention has good popularization and application prospect; And the present invention not only is suitable for can also being used in the control system of other similar many bus-types in the switching control of bus-type keyboard, display, mouse.
Description of drawings
Fig. 1 is that the structure of bus-type keyboard of the present invention, display, mouse switching control is formed block scheme;
Fig. 2 is the circuit structure block scheme of node control module of the present invention;
Fig. 3 is the control circuit electrical schematic diagram of node control module of the present invention;
Fig. 4 is the implementation method process flow diagram of bus-type keyboard of the present invention, display, mouse switching control.
Embodiment
Referring to Fig. 1, the present invention is a kind of bus-type keyboard, display, mouse switching control that is used for server group of planes application, and this device 10 that the thick dashed line frame comes out among the figure includes bus, is articulated in control end module 1 and a plurality of node control module 2,3,4 on this bus respectively.Wherein bus is a category-5 cable, include analog signal transmission bus and digital data transmission bus, the present invention adopts by a high level line and the controller area network (CAN that the low level line is formed, Controller Area Network) bus is as digital signal bus, analog signal bus is by transmitting R+H respectively, G, three pairs of twisted-pair feeders of B+V video display signal are formed, wherein the every pair of twisted-pair feeder transmits the bipolar signal of positive negative level, like this can be so that be usually located at connection mouse in the Control Room 30, the control end module 1 of keyboard and display and a plurality of node control modules 2 that are positioned at server group of planes machine room 20,3,4 transmission range can reach 300 meters.The two ends of digital signal bus and analog signal bus are connected in series the build-out resistor that forms good termination respectively.Node control module 2,3,4 connects server separately respectively, be used to receive the order of control end module 1, control the disconnection or the closure of this node and analog signal bus, blocking-up or discharge being connected of server shows signal that this node connects and analog signal bus is so that the shows signal of the server of this node connection can realize by the one-way transmission of this node to control end.Fig. 1 shows: control end module 1 is identical with node control module 2,3,4 circuit structures, all includes digital circuit D and mimic channel A two parts, and wherein digital circuit D realizes the signal transmission by the CAN bus, and transmission mode is two-way; Mimic channel A realizes by the one-way transmission of node to control end by the analog signal transmission bus.
Referring to Fig. 2, the control circuit of node control module of the present invention mainly includes: by the digital circuit (signal flow draws with heavy line) that the RJ45 interface of the PS/2 interface of microprocessor and its peripheral circuit-bus transceiver, keyboard and mouse and digital signal thereof is formed, the video graphics adapter VGA interface that is linked in sequence, vision signal carried out the mimic channel (signal flow draws with hollow solid line) of the RJ45 interface composition of the circuit of compound packing and differential transfer circuit, relay switching circuit and relay and vision signal.The VGA in left side links to each other with mouse, keyboard with the display of its corresponding server respectively with two PS/2 interfaces among the figure.Wherein the function of microprocessor is: in working order down, will control connected bus transceiver again to communicate by letter with control end with the CAN bus by the RJ45 interface via the processing of packing of mouse, the keyboard signal of this node server of PS/2 interface; Simultaneously by its I/O interface pilot relay on-off circuit work, make under mode of operation, the relay adhesive, the shows signal of this node server is transferred to the node control module via the VGA interface simulating signal exports by packing and difference that (this circuit is the circuit of comparative maturity, the circuit general with industry is identical, so repeat no more), can be discharged on the analog signal transmission bus, realize by the one-way transmission of this node to control end.Under standby mode, microprocessor is responded the order of server, the i.e. mouse of emulation server and keyboard; Simultaneously, cut-off, the shows signal transmission of this node server is blocked.Two RJ45 interfaces on right side link by category-5 cable and adjacent node respectively, constitute the physical transmission medium of CAN bus and analog signal transmission bus.
Referring to Fig. 3, introduce the electrical schematic diagram of node control circuit module.Microprocessor IC1 connects CAN bus transceiver IC2 by its TX/RX interface, so that send and receive order on CAN bus D8, D7.The physical medium of CAN bus is a pair of twisted-pair feeder in the category-5 cable, and they connect D8, the D7 of adjacent two RJ45 interface J3 (DOWN RJ45) and U8, the U7 of J2 (UP RJ45) respectively.Remaining three couples of twisted-pair feeder D6-D1 and U6-U1 be as the transfer bus that transmits R+H, G, B+V video simulation shows signal respectively in the category-5 cable, and wherein the every pair of twisted-pair feeder transmits the bipolar signal of positive negative level.The Vedio on pin P32 of microprocessor IC1 connects relay switching circuit IC6.This relay switching circuit IC6 is the analog switch (model: MAX4628) of three relay g3-g1 power supply paths of control, power for three relay g3-g1 by whether to control these relays still to connect between the RJ45 interface and switch connecting follow-up analog signal bus, be used to block or the simulating signal that discharges this node to the analog signal transmission bus.These three relay g3-g1 are the dpdt double-pole double-throw (DPDT) structures, six changeover contacts of three relays are respectively the uplink port D1-D6 of the analog signal bus of this node, six quiet contacts of three relays connect respectively and the corresponding follow-up bus U1-U6 of uplink port D1-D6 of changeover contact analog signals bus separately, six moving contacts then connect respectively this node through the display simulation signal bus after packing, the difference processing: RED+, RED-, GERRN+, GREEN-, BLUE+, BLUE-.
The control circuit of node control module also includes: as the power converting circuit IC5 of power supply acp chip, it is responsible for obtaining+the 5V direct current from PS/2 by the corresponding contact of J1, J4, and is transformed into-5V.By the node duty indicating circuit that two-color diode LED1 forms, the bright expression duty of red pipe R, the bright expression waiting status of green pipe G.The read-write control circuit of mouse, keyboard data signal and the clock signal of reset circuit IC3 and four on-off circuit compositions, the transmitting-receiving of signal that is used to guarantee mouse, keyboard is working properly, guarantees that promptly microprocessor IC1 can realize the data of mouse and keyboard, the sending and receiving function of clock signal by different I/O on the same line road.Two XOR gate are used for the shaping of H, V digital signal is regenerated.
Referring to Fig. 4, the performing step of working mechanism of the present invention or control method is described:
(1) the control end module is sent the closed relay instruction by number bus all node control modules before the purpose node server that needs are controlled alternately;
(2) microprocessor of each node control module receives out code, closes relay separately respectively, and enters standby mode; At this moment, microprocessor is only monitored the order of CAN bus, not to bus sending information, starts mouse, keyboard simulation program simultaneously, and the mouse of virtual server, keyboard make server detect mouse, keyboard operate as normal;
(3) the purpose node control module controlled alternately to needs by digital signal bus of control end module is sent and is opened the relay instruction;
(4) microprocessor of purpose node control module receives OPEN, and the adhesive of order relay makes the server shows signal of this website connect analog signal bus, and enters mode of operation; At this moment, will between the mouse of the server of this node and control end, keyboard, set up Virtual Path, realize communicating by letter between server and mouse, the keyboard;
(5) flow process that switches to purpose node server finishes.
Claims (9)
1, a kind of bus-type keyboard, display, the mouse switching control, it is characterized in that: this device includes bus, be articulated in a control end module and a plurality of node control module on this bus respectively, described bus includes analog signal transmission bus and digital data transmission bus, described control end module is connected with mouse, keyboard and display, described node control module connects each server respectively, be used to receive the order of control end module, control the disconnection or the closure of this node and analog signal bus, blocking-up or discharge being connected of server shows signal that this node connects and analog signal bus is so that the shows signal of the server of this node connection can realize by the one-way transmission of this node to control end; The control circuit of described node control module comprises: the digital circuit of being made up of the RJ45 interface of the PS/2 interface of microprocessor and its peripheral circuit-bus transceiver, keyboard and mouse and digital signal thereof, the video graphics adapter VGA interface that is linked in sequence, vision signal is carried out the mimic channel that the RJ45 interface of the circuit of compound packing and differential transfer circuit, relay switching circuit and relay, vision signal is formed, and power converting circuit, node duty indicating circuit, reset circuit and mouse, keyboard read-write control circuit.
2, switching control according to claim 1, it is characterized in that: the function of the microprocessor in the described node control module control circuit is: in working order down, will be via the processing of packing of mouse, the keyboard signal of this node server of PS/2 interface, control the bus transceiver that its TX/RX interface connects and communicate by letter with control end by digital signal bus; Under standby mode, respond the order of server, i.e. the mouse of emulation server and keyboard; By its I/O interface pilot relay on-off circuit work, make under mode of operation, the relay adhesive, the shows signal of this node server is discharged on the analog signal transmission bus, realizes by the one-way transmission of this node to control end; Under standby mode, cut-off, the shows signal transmission of this node server is blocked.
3, switching control according to claim 1 is characterized in that: the circuit structure of described control end module is identical with the node control module, to reduce type of modules.
4, switching control according to claim 1, it is characterized in that: described digital signal bus and analog signal bus are category-5 cables, wherein digital signal bus is by a high level line and the controller area network bus that the low level line is formed, analog signal bus is made up of three pairs of twisted-pair feeders that transmit R+H, G, B+V video display signal respectively, wherein the every pair of twisted-pair feeder transmits the bipolar signal of positive negative level, and the two ends of digital signal bus and analog signal bus are connected in series the build-out resistor that forms good termination respectively.
5, switching control according to claim 4, it is characterized in that: described category-5 cable connects two RJ45 interfaces between control end module and each node control module adjacent one another are respectively, constitutes the physical transmission medium of digital signal bus and analog signal bus.
6, switching control according to claim 1, it is characterized in that: described relay construction is the dpdt double-pole double-throw (DPDT) type, three relays are arranged on each node control module, control the disconnection or the closure of the bipolar signal transfer bus of three display simulation signals respectively, in order to blocking-up or discharge the server shows signal of this node and being connected of analog signal transmission bus.
7, the control method of a kind of bus-type keyboard, display, mouse switching control is characterized in that comprising the following steps:
(1) the control end module is sent the closed relay instruction by number bus all node control modules before the purpose node server that needs are controlled alternately;
(2) microprocessor of described each node control module receives out code, closes relay separately respectively, and enters standby mode;
(3) the purpose node control module controlled alternately to needs by digital signal bus of control end module is sent the relay OPEN;
(4) microprocessor of purpose node control module receives OPEN, and the adhesive of order relay makes the server shows signal of this website connect analog signal bus, and enters mode of operation;
(5) flow process that switches to the purpose node finishes.
8, control method according to claim 7 is characterized in that: described standby mode is the order that the microprocessor of this node control module is only monitored digital signal bus, not to bus sending information; Start mouse, keyboard simulation program simultaneously, the mouse of virtual server, keyboard make server can detect mouse, keyboard operate as normal.
9, control method according to claim 7, it is characterized in that: to be the microprocessor of this node control module set up Virtual Path to described mode of operation between the mouse of this node server and control end, keyboard, realizes communicating by letter between this server and mouse, the keyboard; Simultaneously, the shows signal of this node server is discharged on the analog signal bus, realizes by the one-way transmission of this node server to the control end display.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100294815A CN1315032C (en) | 2004-03-19 | 2004-03-19 | Bus type keyboard, display and mouse switching control apparatus and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100294815A CN1315032C (en) | 2004-03-19 | 2004-03-19 | Bus type keyboard, display and mouse switching control apparatus and method |
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| Publication Number | Publication Date |
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| CN1670676A CN1670676A (en) | 2005-09-21 |
| CN1315032C true CN1315032C (en) | 2007-05-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2004100294815A Expired - Fee Related CN1315032C (en) | 2004-03-19 | 2004-03-19 | Bus type keyboard, display and mouse switching control apparatus and method |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101963893B (en) * | 2009-07-24 | 2013-08-14 | 宏正自动科技股份有限公司 | Multi-computer switching system and signal processing method thereof |
| CN103595970B (en) * | 2013-11-21 | 2017-02-22 | 浙江宇视科技有限公司 | Video monitoring device and method for rapidly switching analog video and IP video |
| CN107748626B (en) * | 2017-10-31 | 2020-12-01 | 北京计算机技术及应用研究所 | PS/2 keyboard and mouse switching and monitoring equipment based on system on programmable chip |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1558304A (en) * | 2004-01-14 | 2004-12-29 | 中国科学院计算技术研究所 | Switcher for keyboard, display and mouse adopting bus structure |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1558304A (en) * | 2004-01-14 | 2004-12-29 | 中国科学院计算技术研究所 | Switcher for keyboard, display and mouse adopting bus structure |
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| CN1670676A (en) | 2005-09-21 |
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