CN102624445B - Infrared-based unidirectional data transmission equipment - Google Patents
Infrared-based unidirectional data transmission equipment Download PDFInfo
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- CN102624445B CN102624445B CN201210062725.4A CN201210062725A CN102624445B CN 102624445 B CN102624445 B CN 102624445B CN 201210062725 A CN201210062725 A CN 201210062725A CN 102624445 B CN102624445 B CN 102624445B
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Abstract
The invention provides infrared-based unidirectional data transmission equipment, which comprises a data sending unit, a data receiving unit and a unidirectional data transmitting unit; and the data sending unit, the unidirectional data transmitting unit and the data receiving unit are connected in sequence through USB shielding cables. The infrared-based unidirectional data transmission equipment provided by the invention completely realizes unidirectional data transmission on a physical medium, fundamentally solves the problem of low safety of unidirectional data transmission and can ensure that information at the receiving end cannot be leaked to the sending end due to communication.
Description
Technical field
The invention belongs to data wireless transmission field, be specifically related to a kind of based on infrared one-way data transfer equipment.
Background technology
Infrared data transmission (IrDa:Infrared Data): be the transfer of data utilizing infrared mode to realize between computer.
Existing typical IR transfer of data mainly contains following three kinds of application models and corresponding technical scheme:
Be illustrated in figure 1 computer application scheme, its main feature is integrated infrared data transmission-receiving function on computers, and the major constituents of the program is: be made up of the bus of computer CPU and infrared receiving/transmission head.
Be illustrated in figure 2 portable electronic applications scheme, the typical apply of this scheme is mobile phone infrared communication, its main feature is integrated infrared data transmission-receiving function on cell phone mainboard, and the major constituents of the program is: be made up of the bus of mobile phone CPU and infrared receiving/transmission head.
Being illustrated in figure 3 with USB is the infrared transceiver of interface, program main feature is the infrared communication function for certain does not have the computer of infrared communication function to provide extra, the major constituents of infrared transceiver is become with infrared receiving/transmission head group by USB interface chip, single-chip microcomputer, and connected computer by USB cable.
The major constituents feature of above-mentioned various infrared transmission scheme: same infrared data transmission equipment is reflector, is again receiver.They can carry out the transmitted in both directions of infrared data with any one uncertain infrared equipment (same be reflector and receiver), only rely on self individual equipment then can not send, can not receive.
The main operational principle of such scheme: after infrared equipment starts, send infrared reconnaissance signal, search periphery and whether there is infrared equipment, if there is infrared equipment to exist, then send Handshake Protocol, the communication protocol of inquiry the other side and frequency, the other side replys the communication protocol and traffic rate that oneself can adopt, and when both sides have identical agreement and frequency, then sets up communication and connects, and host computer is sent to the signal of built vertical infrared channel, thus can start to carry out two-way IR communications.
Present all carries out transfer of data by two-way communication based on infrared data transmission device, be not suitable for the occasion higher to security level required to use, particularly be not suitable between the Internet to dedicated network, between the network of High Security Level and the network of Low Security Level and require the requirement of swapping data of physically-isolated two networks, the needs of secure data exchange between the computer being unsuitable for different level of security too; And transmitting device is reflector and receiver, therefore there are data in unauthorized situation by artificial mutual transmission, the risk being received and dispatched and stolen by trojan horse transmission by rogue program; Transmitting device all adopts open transmission means on physique, and do not possess infrared waves protection mechanism, thus, between two equipment except swap data, the data in transmission also may be monitored and receive to other equipment, causes the fail safe of transfer of data low; These transmitting devices all adopt infrared receiving/transmission head as the main device of transmitting-receiving, as long as thus data are placed in transmission channel, then directly be sent out, do not possess more controlling functions and interface, the basic condition of high-level data security control can not be added in transmitting procedure; And these data transmission sets can be linked into arbitrarily on any computer, and without any technical restriction and control measure, therefore may cause misuse and the abuse of data, cause the invalidation of government's supervising of secure network; The sending and receiving device of existing transmitting device is all configured with storage device, thus for some environment to information security sensitivity, easily causes information to shift with transceiver, thus cause the needs that information is out of control, can not meet security context; Moreover in existing transmitting device, the reconstruct of data is adopted to the strategy resend, be worthless for large files; Again send out a file, required chronic when being especially greater than the file of 1GB, under normal conditions, the transmission carrying out file only has the data less than 1% to need to resend, the data transmission fault in order to 1% and being resend by whole file, and this makes the inefficiency of transfer of data.
Summary of the invention
For overcoming above-mentioned defect, the invention provides a kind of based on infrared one-way data transfer equipment, the one-way transmission of data is realized completely from physical medium, fundamentally solve the problem that the fail safe of unidirectional data transmission is not high, also can ensure that the information of receiving terminal can not be leaked to transmitting terminal due to communication.
For achieving the above object, the invention provides a kind of based on infrared one-way data transfer equipment, it comprises: data transmission unit and data receipt unit; Its improvements are, described equipment comprises one-way data transfer unit; Described data transmission unit, described one-way data transfer unit are connected by USB shielded type cable successively with described data receipt unit.
In optimal technical scheme provided by the invention, described data transmission unit and described data receipt unit are all computer or the network terminal.
In second optimal technical scheme provided by the invention, described one-way data transfer unit comprises unidirectional infrared transmitter and receives the unidirectional infrared remote receiver of its data.
In 3rd optimal technical scheme provided by the invention, between described unidirectional infrared transmitter and described unidirectional infrared remote receiver, be provided with infrared protection cover.
In 4th optimal technical scheme provided by the invention, described unidirectional infrared transmitter comprises the firing button be arranged in shell 1, USB chip, micro-control unit 1, infrared control chip 1, memory, infrared emission head and battery; Described data transmission unit is connected by described USB shielded type cable with described USB chip; Described firing button is connected with described micro-control unit respectively with USB chip; Described infrared control chip is connected with described micro-control unit, described memory and described infrared emission head respectively.
In 5th optimal technical scheme provided by the invention, described unidirectional infrared remote receiver comprises the USB chip, micro-control unit 2, infrared control chip 2 and the infrared receiving terminal that connect successively; Described USB chip is connected by described USB shielded type cable with described data receipt unit; Described USB chip, described micro-control unit 2, described infrared control chip 2 and described infrared receiving terminal are arranged in shell 2.
In 6th optimal technical scheme provided by the invention, described infrared protection cover is cylinder-like structure; The length of described infrared protection cover is 54mm to 56mm; External diameter is 17mm to 18mm, and internal diameter is 15mm to 16mm, and wall thickness is 1.8mm to 2.2mm.
In 7th optimal technical scheme provided by the invention, described infrared protection cover uses inorganic wave-absorbing material to make; The inwall of described infrared protection cover is coated with nano-material coating.
In 8th optimal technical scheme provided by the invention, described inorganic wave-absorbing material is " NM type " inorganic material that the sky, Dalian microwave absorbing material Co., Ltd produces.
In 9th optimal technical scheme provided by the invention, described nano-material coating is nano oxidized sub-nickel-silica material.
In tenth optimal technical scheme provided by the invention, this section of internal diameter 0.8mm less of the internal diameter of remainder of described infrared protection cover inside 3mm vertically from end; Described infrared protection cover is respectively equipped with installing retaining ring apart from every end margin 1.5mm place.
In more preferably technical scheme provided by the invention, described installing retaining ring is positioned on infrared protection cover inwall, and height of projection is 0.3mm.
Provided by the invention second more preferably in technical scheme, described unidirectional infrared transmitter and described unidirectional infrared remote receiver be respectively arranged with described installing retaining ring with the use of protective cover installation module.
Provided by the invention 3rd more preferably in technical scheme, the torus 1,2 that it is axis that described protective cover installation module comprises with the line of described infrared emission head and described infrared receiving terminal.
Provided by the invention 4th more preferably in technical scheme, and fit with described shell 1,2 respectively in one end of described torus 1,2, the other end is opening; Described opening is tubaeform; The internal diameter of described opening is 4-6mm, external diameter is 16-20mm, length is 8-10mm.
Provided by the invention 5th more preferably in technical scheme, and described torus 1,2 is respectively arranged with the female bayonet that the degree of depth is 0.3mm on the outer wall apart from edge of opening 1.5mm.
Provided by the invention 6th more preferably in technical scheme, and described opening 1,2 is circular.
Provided by the invention 7th more preferably in technical scheme, and the inwall of described shell 1 and shell 2 is coated with electro-magnetic screen layer; The chip that described micro-control unit 1,2 all uses model to be LM3S9B96; The chip that described infrared control chip 1,2 all uses model to be DSR.IR248; The chip that described infrared emission head and described infrared receiving terminal all use model to be Vishay; Described USB chip uses the chip that model is USB20D.
Provided by the invention 8th more preferably in technical scheme, and described electro-magnetic screen layer is the Chain Link Fence being coated with macromolecular material.
Provided by the invention 9th more preferably in technical scheme, and described memory is flash memory or hard disk.
Compared with the prior art, provided by the invention a kind of based on infrared one-way data transfer equipment, utilize infrared transmission untouchable, can the characteristic of one-way transmission, achieve the one-way transmission of data, without the need to shaking hands when setting up transmission channel, without the need to exchange agreement, achieve protocol layer, transport layer completely isolated; The reflector provided, receiver are all independently, achieve the physical isolation of reception, transmitter; And in one-way data transfer equipment, provide a kind of protective cover preventing infrared waves from leaking, infrared communication is allowed to transmit in completely isolated space, block any possible signals leakiness, thus prevented the extraneous monitoring to data and eavesdropping, improve the fail safe of transmission; Use special infrared transmission chip, for the transmission realizing higher level controls the condition that provides the foundation, and on this conditioned basic, achieve the safety control measures of higher level, can manage the piecemeal transmitted and receive data, segmentation, thus improve the reliability of transfer of data, manageability and fail safe; The high speed infrared integrating control chip adopted, high speed infrared transmitting-receiving head, all supports FIR agreement and the VFIR agreement of IrDA association, provides the high speed infrared sending and receiving ability of 4MBPS and 16MBPS, improve transmission rate; Further, only emitting head is configured with for transmitter, only Receiver is configured with for receiving equipment, prevent from hardware the possibility that receiving equipment sends data, transmitter receives data; The reflector of one-way data transfer equipment is provided with local memory space and Computer Storage space, two kinds of different mode of operations can be realized, one is when two different network terminals are in same working region, can realize directly from a network terminal to the data one-way transmission of another network terminal; Two is when two different network terminals are not at the same area, then can pass through the memory space (this upload be encryption upload) of the data upload of output network terminal to reflector, then equipment is taken to the input network terminal or the working region at computer place, by firing button by data sheet to the network terminal being sent to receiving equipment place; Reflector can use and carry reserve battery and power, thus guarantees that reflector does not carry out the physical connection of any cable (comprising power supply) with receiving terminal service area; And, receiver does not arrange memory device and memory space, only from infrared receiving terminal to the data flow of the host computer storage directory of specifying, and the reverse data do not possessed from computer to receiver flows to, thus prevents any write operation from computer to receiver; Moreover, equipment provides a kind of interface mode for subsequent use, this interface mode can realize receiving equipment and be identified as USB common apparatus instead of memory device, therefore, can forbid the secure network of USB flash disk, USB CD-ROM drive and computer are correctly validated at some, thus realize its data input function.Overcome existing equipment on computers with the identification of USB flash disk mode, thus cause non-serviceable problem on some secure network.
Accompanying drawing explanation
Fig. 1 is the computer application scheme of infrared data transmission in prior art.
Fig. 2 is the portable electronic applications scheme of infrared data transmission in prior art.
Fig. 3 is the application scheme of the infrared transceiver being interface with USB in prior art.
Fig. 4 is the unidirectional infrared transmitter based on infrared one-way data transfer equipment.
Fig. 5 is the unidirectional infrared remote receiver based on infrared one-way data transfer equipment.
Fig. 6 is the structural representation Fig. 1 based on infrared one-way data transfer equipment.
Fig. 7 is the structural representation Fig. 2 based on infrared one-way data transfer equipment.
Fig. 8 is the structural representation of infrared protection cover.
Fig. 9 is the external structure schematic diagram of Receiver and emitting head.
Embodiment
As shown in Figure 6,7, a kind of based on infrared one-way data transfer equipment, it comprises: data transmission unit and data receipt unit; Described equipment comprises one-way data transfer unit; Described data transmission unit, described one-way data transfer unit are connected by USB shielded type cable successively with described data receipt unit.
Described data transmission unit and described data receipt unit are all computer or the network terminal; Described one-way data transfer unit comprises interconnective unidirectional infrared transmitter and unidirectional infrared remote receiver.
Infrared protection cover is provided with between described unidirectional infrared transmitter and described unidirectional infrared remote receiver.
As shown in Figure 8, this section of internal diameter 0.8mm less of the internal diameter of remainder of described infrared protection cover inside 3mm vertically from end; Described infrared protection cover is respectively equipped with installing retaining ring apart from every end margin 1.5mm place.Described installing retaining ring is positioned on infrared protection cover inwall, and height of projection is 0.3mm.Described unidirectional infrared transmitter and described unidirectional infrared remote receiver be respectively arranged with described installing retaining ring with the use of protective cover installation module.The torus 1,2 that it is axis that described protective cover installation module comprises with the line of described infrared emission head and described infrared receiving terminal.Fit with described shell 1,2 respectively in one end of described torus 1,2, the other end is opening; Described opening is tubaeform; The internal diameter of described opening is 4-6mm, external diameter is 16-20mm, length is 8-10mm.Described torus 1,2 is respectively arranged with the female bayonet that the degree of depth is 0.3mm on the outer wall apart from edge of opening 1.5mm.Described opening 1,2 is circular.
As shown in Figure 4, described unidirectional infrared transmitter comprises firing button, USB chip, micro-control unit 1, infrared control chip 1, memory, infrared emission head and battery; Described firing button, described USB chip, described micro-control unit 1, described infrared control chip 1, described memory, described infrared emission head and described battery are all arranged in shell 1; Described data transmission unit is connected by described USB shielded type cable with described USB chip; Described firing button is connected with described micro-control unit respectively with USB chip; Described infrared control chip is connected with described micro-control unit, described memory and described infrared emission head respectively.
As shown in Figure 5, described unidirectional infrared remote receiver comprises the USB chip, micro-control unit 2, infrared control chip 2 and the infrared receiving terminal that connect successively; Described USB chip is connected by described USB shielded type cable with described data receipt unit; Described USB chip, described micro-control unit 2, described infrared control chip 2 and described infrared receiving terminal are arranged in shell 2.
The inner side of described shell 1 and shell 2 is provided with electro-magnetic screen layer; The chip that described micro-control unit 1,2 all uses model to be LM3S9B96; The chip that described infrared control chip 1,2 all uses model to be DSR.IR248; The chip that described infrared emission head and described infrared receiving terminal all use model to be Vishay; Described USB chip uses the chip that model is USB20D.
The inner side of described shell 1 and shell 2 is provided with electro-magnetic screen layer; Described electro-magnetic screen layer is the Chain Link Fence being coated with macromolecular material.
The chip that described micro-control unit 1 and described micro-control unit 2 all use model to be LM3S9B96.The chip that described infrared control chip 1 and described infrared control chip 2 all use model to be DSR.IR248.Described memory is flash memory or hard disk.The chip that described infrared emission head and described infrared receiving terminal all use model to be Vishay.
As shown in Figure 9, be the external structure schematic diagram of Receiver and emitting head.
Provided by the invention based on infrared one-way data transfer equipment, first the subject matter solved is, be utilize infrared transmission untouchable, can the characteristic of one-way transmission, achieve the one-way transmission of data, realize the foundation of transmission channel without the need to shaking hands, without the need to exchange agreement, achieve protocol layer, transport layer completely isolated.
The reflector that technical scheme of the present invention provides, receiver are all independently, it is different from existing scheme transceiver is all one, not only make reflector but also make receiver, but reflector just can only as reflector, receiver just as receiver, thus can only achieve the physical isolation of reception, transmitter.
Provide a kind of protection mechanism preventing infrared waves from leaking, allow infrared communication transmit in completely isolated space, blocked any possible signals leakiness, thus prevent monitoring, eavesdropping, improve the fail safe of transmission.
Use special infrared transmission chip, for the transmission realizing higher level controls the condition that provides the foundation, and on this conditioned basic, achieve the safety control measures of the higher level-piecemeal transmitted and receive data, segmentation are managed, thus improve the reliability of transmission, manageability, fail safe.
The high speed infrared integrating control chip that the technical program adopts, high speed infrared transmitting-receiving head, all support FIR agreement and the VFIR agreement of IrDA association, provide the high speed infrared sending and receiving ability of 4MBPS and 16MBPS, achieve transmission rate the highest in current technical scheme.
For transmitter, be only configured with emitting head, for receiving equipment, be only configured with Receiver, prevent from hardware the possibility that receiving equipment sends data, transmitter receives data.
The receiver of this equipment is provided with local memory space and Computer Storage space, two kinds of different mode of operations can be realized, one is when two different network terminals are in same working region, can realize directly from a network terminal to the data one-way transmission of another network terminal; Two is when two different network terminals are not at the same area, then can pass through the memory space (this upload be encryption upload) of the data upload of output network terminal to reflector, then equipment is taken to the input network terminal or the working region at computer place, by the button of reflector by data sheet to the network terminal being sent to receiving equipment place.Reflector can use and carry reserve battery and power, thus guarantees that reflector does not carry out the physical connection of any cable (comprising power supply) with receiving terminal service area.
The receiver of this equipment does not arrange memory device and memory space, only from infrared receiving terminal to the data flow of the host computer storage directory of specifying, and the reverse data do not possessed from computer to receiver flows to, thus any data from computer to receiver are prevented to write possibility.
This equipment provides a kind of interface mode for subsequent use, this interface mode can realize receiving equipment and be identified as USB common apparatus instead of memory device, therefore, it is possible to forbid the secure network of USB flash disk, USB CD-ROM drive and computer are correctly validated at some, thus realize its data input function.Overcome existing equipment on computers with the identification of USB flash disk mode, thus cause non-serviceable problem on some secure network.
Carry out identifying and certification to be supported in encrypted system on refined net.
Technical scheme provided by the present invention and product, efficiently solve the safety issue transmitting data between heterogeneous networks, different computer, achieve the complete physical isolation of transmission, and protocol layer, transport layer one-way, provide transfer of data at a high speed simultaneously, meet the needs that high-speed data under various security context exchanges.
The soluble problem of infrared protection cover comprises:
1) prevent the infrared waves in transmission from leaking and being stolen by third party;
2) prevent other light waves of third party from intruding into the light wave in transmission and affecting normal transmission;
3) minimizing even stops infrared transmission to the interference of other equipment and personnel in environment and radiation.
4) following problem to be solved after use protective cover: prevent infrared waves from constantly reflecting in protective cover, reflect thus disturb normal transmission.For this reason, we have employed two kinds of technical measures: one be use a kind of have strong absorb infrared waves can the inorganic material of machining as the basic material (this equipment adopts one to be called, and the inorganic material-sky, the Dalian microwave absorbing material Co., Ltd of " NM type " produces) making protective cover, make and become tubular protective cover base structure; Two is on the basis of this structural member aforementioned, the nano-material coating (nano oxidized sub-nickel-SiO material) of near-infrared light waves is absorbed in the high strength that its inside pipe wall even application 0.5mm is thick, the near-infrared light waves of this nano material to 650nm ~ 1mm has the highest absorption efficiency, and the infrared communication light wave that this equipment adopts is between 850mm ~ 900mm, specifically wave band is 880mm ~ 900mm, just the best service band of this nano material wave absorbing efficiency.
5) by using protective cover and the technology that uses at this protective cover, the perfect adaptation of fail safe and validity, reliability is achieved.
3, the physical specification of protective cover:
1) adopt material: have strong absorb infrared waves can the inorganic material of machining as the basic material (NM type absorbing material) making protective cover, and be aided with nano wave-absorption coating (SiO).
2) material colour system: foundation protection vestlet material adopts Dark grey, nano wave-absorption coating adopts black, and be more than based on dark color with look, particularly the assimilation effect of black to infrared waves is better than other colors.
3) physical size: this protective cover length 55mm; External diameter 17.5mm, internal diameter 15.5mm, wall thickness 2mm (containing coating).
4) other specifications: start at 3mm place, protective cover two ends, external diameter shrinks 0.8mm, and at distance two edge tail 1.5mm places, is provided with one and protrudes 0.3mm installing retaining ring, this latch closure is compressible rubber latch closure, to make it to be connected locking mutually with the installation bayonet socket on reflector and receiver.
4, corresponding with protective cover on reflector, acceptor unit mounting structure is:
1) outside casing, centered by sending and receiving head, a horn-type opening is constructed.
2) this horn-type opening internal orifice aforementioned (horn mouth osculum one end) diameter 5mm, collar extension diameter 18mm, depth 9mm.
3) have a ring shaped slot, groove width 1.2mm at horn mouth apart from 3mm place, outside, apart from outer ledge 1.5mm place in this groove, have the female bayonet of a 0.3mm, the convex installing ring of this bayonet socket and protective cover end interlocks, to realize protective cover locking.
Being installed as 5, between this protective cover and sending and receiving unit exempts from tool-type, during installation or removal protective cover, only needs to hold equipment and protective cover respectively with hand, is slightly forced into, or transfers to.
It is to be understood that content of the present invention and embodiment are intended to the practical application proving technical scheme provided by the present invention, should not be construed as limiting the scope of the present invention.Those skilled in the art inspired by the spirit and principles of the present invention, can do various amendment, equivalent replacement or improve.But these changes or amendment are all in the protection range that application is awaited the reply.
Claims (9)
1. based on an infrared one-way data transfer equipment, it comprises: data transmission unit and data receipt unit; It is characterized in that, described equipment comprises one-way data transfer unit; Described data transmission unit, described one-way data transfer unit are connected by USB shielded type cable successively with described data receipt unit;
Described data transmission unit and described data receipt unit are all computer or the network terminal;
Described one-way data transfer unit comprises unidirectional infrared transmitter and receives the unidirectional infrared remote receiver of its data;
Described unidirectional infrared transmitter comprises the firing button be arranged in the first shell, USB chip, the first micro-control unit, the first infrared control chip, memory, infrared emission head and battery; Described data transmission unit is connected by described USB shielded type cable with described USB chip; Described firing button and USB chip are connected with described first micro-control unit respectively; Described first infrared control chip is connected with described first micro-control unit, described memory and described infrared emission head respectively;
Infrared protection cover is provided with between described unidirectional infrared transmitter and described unidirectional infrared remote receiver;
Described infrared protection cover is cylinder-like structure; The length of described infrared protection cover is 54mm to 56mm; External diameter is 17mm to 18mm, and internal diameter is 15mm to 16mm, and wall thickness is 1.8mm to 2.2mm;
Described infrared protection cover uses inorganic wave-absorbing material to make; The inwall of described infrared protection cover is coated with nano-material coating;
Described nano-material coating is nano oxidized sub-nickel-silica material;
This section of internal diameter 0.8mm less of the internal diameter of remainder of described infrared protection cover inside 3mm vertically from end; Described infrared protection cover is respectively equipped with installing retaining ring apart from every end margin 1.5mm place;
Described installing retaining ring is positioned on infrared protection cover inwall, and height of projection is 0.3mm.
2. equipment according to claim 1, is characterized in that, described unidirectional infrared remote receiver comprises the USB chip, the second micro-control unit, the second infrared control chip and the infrared receiving terminal that connect successively; Described USB chip is connected by described USB shielded type cable with described data receipt unit; Described USB chip, described second micro-control unit, described second infrared control chip and described infrared receiving terminal are arranged in second housing.
3. equipment according to claim 1, is characterized in that, described unidirectional infrared transmitter and described unidirectional infrared remote receiver be respectively arranged with described installing retaining ring with the use of protective cover installation module.
4. equipment according to claim 3, is characterized in that, the first torus, the second torus that it is axis that described protective cover installation module comprises with the line of described infrared emission head and described infrared receiving terminal.
5. equipment according to claim 4, is characterized in that, described first torus, second toric one end are fitted with the first shell, second housing respectively, and the other end is opening; Described opening is tubaeform; The internal diameter of described opening is 4-6mm, external diameter is 16-20mm, length is 8-10mm.
6. equipment according to claim 5, is characterized in that, described first torus, the second torus are respectively arranged with the female bayonet that the degree of depth is 0.3mm on the outer wall apart from edge of opening 1.5mm.
7. equipment according to claim 1 and 2, is characterized in that, the inwall of described first shell and second housing is coated with electro-magnetic screen layer; The chip that described first micro-control unit, the second micro-control unit all use model to be LM3S9B96; The chip that described first infrared control chip, the second infrared control chip all use model to be DSR.IR248; The chip that described infrared emission head and described infrared receiving terminal all use model to be Vishay; Described USB chip uses the chip that model is USB20D.
8. equipment according to claim 7, is characterized in that, described electro-magnetic screen layer is the Chain Link Fence being coated with macromolecular material.
9. equipment according to claim 1, is characterized in that, described memory is flash memory or hard disk.
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| CN201210062725.4A CN102624445B (en) | 2012-03-12 | 2012-03-12 | Infrared-based unidirectional data transmission equipment |
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| CN201210062725.4A CN102624445B (en) | 2012-03-12 | 2012-03-12 | Infrared-based unidirectional data transmission equipment |
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| CN102624445B true CN102624445B (en) | 2014-12-24 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101382982A (en) * | 2008-10-06 | 2009-03-11 | 谢翔 | Physical one-way transmission apparatus |
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| PL386019A1 (en) * | 2008-09-03 | 2010-03-15 | Diehl Ako Stiftung & Co.Kg. | Method and the system for monitoring and servicing of the devices, basing on the one-wire infrared communication |
| CN100594506C (en) * | 2008-11-18 | 2010-03-17 | 谢翔 | Data uploading transmission extension card apparatus embeded in computer |
| CN101719311B (en) * | 2009-12-21 | 2011-08-17 | 成都九洲电子信息系统有限责任公司 | Method for infrared remote control of computer |
| CN201583949U (en) * | 2010-03-09 | 2010-09-15 | 罗映辉 | Usb wireless terminal |
| CN202034975U (en) * | 2011-04-22 | 2011-11-09 | 林力 | Wireless encryption transmission on-board diagnostic (OBD) port data device |
| CN202696607U (en) * | 2012-03-12 | 2013-01-23 | 成都龙冠科技实业有限公司 | Infrared-based unidirectional data transmission equipment |
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| CN101382982A (en) * | 2008-10-06 | 2009-03-11 | 谢翔 | Physical one-way transmission apparatus |
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