CN101355484A - Communication isolation device using unidirection analog transmission - Google Patents
Communication isolation device using unidirection analog transmission Download PDFInfo
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- CN101355484A CN101355484A CNA2008102121433A CN200810212143A CN101355484A CN 101355484 A CN101355484 A CN 101355484A CN A2008102121433 A CNA2008102121433 A CN A2008102121433A CN 200810212143 A CN200810212143 A CN 200810212143A CN 101355484 A CN101355484 A CN 101355484A
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Abstract
The invention provides a communication isolation device adopting one-way analog transmission, being invented to solve the problem in the prior art that the security of an outer network does not accord with relevant regulations when connected with a special network. The communication isolation device comprises a special communication interface module, a coding module, a data modulation processing circuit module, a data demodulation processing circuit module, a decoding module and an outer network communication interface module, wherein the coding module has data transmitting function but does not have data receiving function; the decoding module has data receiving function but does not have data transmitting function; and the data modulation processing circuit module and the data demodulation processing circuit module have conversion function between analog signals and data signals. In this way, the communication isolation device can ensure that data can only be transmitted from the special network to the outer network by physical one-way analog transmission instead of reverse transmitting, thereby greatly improving the security of the network.
Description
Technical field
The present invention proposes a kind of communication isolation device that adopts unidirectional analogue transmission.
Background technology
For production industries such as oil, petrochemical industry, electric power, iron and steel, collieries, quantity-produced fail safe and reliability there is high requirement.This enterprise is high for the security requirement of process control network, therefore all adopts private network.But in the existing private network communication system, along with the development of informatization, more and more data will be shared with other local system or common communication information network, checks, monitors various information for networking.Owing to need tie point be arranged with outer net, the external world can invade in the private network communication system by tie point, influence even destruction private network system.
But a lot of enterprises have to again private network is connected with outer net, for example coal, electric power enterprise, their private network must be connected with the network of environmental monitoring department, monitor with the enterprise to discharging flue gas pollutants such as power plant, this will be linked into power communication system to the monitoring system of environmental administration.And mostly this access is to adopt two-way direct communication to insert.Fig. 1 has represented the situation that existing other system is connected with the power private network system.In this case, the fail safe of private network can't be protected.The CEMS system of power plant has been linked into the Internet by the GPRS terminal, and communication is two-way, has had potential safety hazard for the operation of electric power system, does not meet " electric power secondary system security protection regulation ".Therefore, be badly in need of a kind of unidirectional safety insulating device of exploitation, be installed between CEMS system of power plant and the GPRS terminal, be not subjected to the invasion of ambient systems to guarantee system in the private network.
Summary of the invention
At defective that exists in the prior art and deficiency, the objective of the invention is to propose a kind of communication isolation device that adopts unidirectional analogue transmission, can when private network is connected with outer net, meet relevant regulations, and improve internet security.
In order to achieve the above object, the present invention proposes a kind of communication isolation device that adopts unidirectional analogue transmission, comprising:
The private network communication interface module, described private network communication interface module realizes the processing with the private network communication agreement, the communication interface circuit conversion is with the data that obtain transmitting;
Coding module, described coding module is with data and command coding and export to the data-modulated treatment circuit, has the data sending function and does not have the Data Receiving function;
Data-modulated processing circuit module, this module are modulated the data of coding module output and are output as analog signal; Data output unit and instruction output are arranged.
Data demodulates processing circuit module, this module receive from the analog signal of data-modulated processing circuit module and carry out demodulation process, send the digital signal that demodulates to decoder module and handle.
Decoder module, described decoder module will be converted to the valid data that need transmission from the digital signal that the data demodulates processing circuit module receives; Institute's decoder module has the Data Receiving function and does not have the data sending function;
The outer net communication interface modules, described outer net communication interface modules is realized the processing with outer net communication protocol, the communication interface circuit conversion transfers data to outer net.
Preferred as technique scheme, described communication interface modules adopts RS-232 communication interface mode, described data modulation circuitry is chip used to be AD420AR and MCP6002I, and described private network and outer net communication interface modules CPU, encoding process, decoding processing, data demodulates treatment circuit are the DSPIC6012 chip.
The present invention proposes a kind of communication isolation device that adopts unidirectional analogue transmission, fail safe does not meet the problem of relevant regulations and invents when being connected with private network at outer net in the prior art, comprising: private network communication interface module, coding module, data-modulated processing circuit module, data demodulates processing circuit module, decoder module, outer net communication interface modules; Wherein said coding module has the data sending function and does not have the Data Receiving function; Institute's decoder module has the Data Receiving function and does not have the data sending function; Data-modulated processing circuit module and data demodulates processing circuit module have the translation function between analog signal and the data-signal.So just can guarantee that data only can be sent to outer net by private network, process of transmitting is a unidirectional analogue transmission physically, and can not oppositely send, and has so just improved the fail safe of network greatly.
The device course of work is: after private network communication interface module and private network two-way alternate communication obtain data, by coding module output digital signal, be modulated to analog signal again, be demodulated into digital signal to analog signal, receive by decoder module again and handle, realize and the two-way communication of outer net by the outer net communication interface modules at last, transfer data to outer net.Transfer of data is the unidirectional analogue transmission on the physical circuit in the device, so just can guarantee that data only can be sent to outer net by private network, and can not oppositely send, and so just makes private network not be subjected to the influence of outer net fully.
Description of drawings
Fig. 1 is the structural representation that existing other system is connected with the power private network system;
Fig. 2 is a preferred embodiment example structural representation of the present invention;
Fig. 3 is private network communication interface module, coding module;
Fig. 4 is the data-modulated processing circuit module;
Fig. 5 is data demodulates processing circuit module, decoder module, outer net communication interface modules.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.For the person of ordinary skill in the field, from detailed description of the invention, above-mentioned and other purposes of the present invention, feature and advantage will be apparent.
The present invention proposes a kind of communication isolation device that adopts unidirectional analogue transmission, its structure comprises as shown in Figure 2: data send part and Data Receiving part.
Described data sending part branch comprises:
The private network communication interface module, described private network communication interface module realizes the processing with the private network communication agreement, the communication interface circuit conversion is with the data that obtain transmitting;
Coding module, described coding module is with data and command coding and export to the data-modulated treatment circuit, has the data sending function and does not have the Data Receiving function;
Data-modulated processing circuit module, this module are modulated the data of coding module output and are output as analog signal; Data output unit and instruction output are arranged.
Described data reception portion branch comprises:
Data demodulates processing circuit module, this module receive from the analog signal of data-modulated processing circuit module and carry out demodulation process, send the digital signal that demodulates to decoder module and handle.
Decoder module, described decoder module will be converted to the valid data that need transmission from the digital signal that the data demodulates processing circuit module receives; Institute's decoder module has the Data Receiving function and does not have the data sending function;
The outer net communication interface modules, described outer net communication interface modules is realized the processing with outer net communication protocol, the communication interface circuit conversion transfers data to outer net;
The communication isolation device that first preferred embodiment of the invention proposes can be realized the single file transfer of data, prevents because of be connected the potential safety hazard that causes with outer net.
Wherein spacer assembly can be specially shown in Fig. 3,4,5, and the private network communication interface module is a RS-232 communication interface mode, and incoming level modular converter and transmission level modular converter are ADM202; The transmitting-receiving pin of private network communication interface chip U4 (11,12 pin) links to each other with light-coupled isolation chip (TLP521-1) U2, U3 respectively, isolates 31,32 pins that back U2, U3 meet DSPIC6012 chip U1 again.CPU (U1) programmes to obtain the data of needs transmission according to private network system communication protocol.
The encoding process module will be encoded with implication by type by the data that the private network communication interface module obtains, because of the modulation circuit employing is analog signal transmission, the D/A chip is 16, in order to guarantee the integrality of transfer of data, data are transmitted by byte, each byte moves to left eight, mend 0x80 for minimum eight, give data modulation circuitry again, to solve the precision problem of analogue transmission, data output is output as high level with other one road D/A simultaneously, effective as instruction with these data of indication the other side, can sample; Coding module links to each other with the data-modulated treatment circuit by spi bus, 4 pins of U1 connect 8 pin of U5 and U6, and 5 pins of U1 connect 9 pins of U5, and 6 pins of U1 connect 10 pins of U6,10 pins of U5 link to each other with 9 pins of U6 then, and 8 pins of U1 link to each other with 7 pins of U5 and U6.
The data-modulated treatment circuit mainly use U5, U6, OP1,17 pins of U5 link to each other with 3 pins of OP1,17 pins and the OP1 of U6 has 5 pins to link to each other, OP1 has 1 pin and 7 pins to connect 13,14 pins of U17 respectively behind resistance.
In the chip DSPIC6012 of decoder module (U17), be integrated with data demodulates treatment circuit part, just 12 A/D modular converter; Decoder module is at first checked the instruction input, if designation data effectively then the sampled data input, with four of the data shift rights that sample, to obtain valid data.
The outer net communication interface modules by U17 by with the communication protocol of outer net, transfer data to outer net.The outer net communication interface modules is a RS-232 communication interface mode, and 31,32 pins of U17 link to each other with optocoupler U15, U16, links to each other with 11,12 pins of U18 after U15, U16 isolate, and 13,14 pins of U18 link to each other with the RS-232 communication interface of outer net again.
Whole system has only the data of private network system to be sent to other system, can not receive the data of other system, so just guarantees the safety of private network system, has also met the standard of some private network system.
Though; the present invention clearly demonstrates by above embodiment and accompanying drawing thereof; yet under the situation that does not deviate from spirit of the present invention and essence thereof; the person of ordinary skill in the field works as can make various corresponding variations and correction according to the present invention, but these corresponding variations and correction all should belong to the protection range of claim of the present invention.
Claims (4)
1, a kind of communication isolation device that adopts unidirectional analogue transmission is characterized in that, comprising:
The private network communication interface module, described private network communication interface module realizes the processing with the private network communication agreement, the communication interface circuit conversion is with the data that obtain transmitting;
Coding module, described coding module is with data and command coding and export to the data-modulated treatment circuit, has the data sending function and does not have the Data Receiving function;
Data-modulated processing circuit module, this module are modulated the data of coding module output and are output as analog signal; Data output unit and instruction output are arranged.
Data demodulates processing circuit module, this module receive from the analog signal of data-modulated processing circuit module and carry out demodulation process, send the digital signal that demodulates to decoder module and handle.
Decoder module, described decoder module will be converted to the valid data that need transmission from the digital signal that the data demodulates processing circuit module receives; Institute's decoder module has the Data Receiving function and does not have the data sending function;
The outer net communication interface modules, described outer net communication interface modules is realized the processing with outer net communication protocol, the communication interface circuit conversion transfers data to outer net.
2, a kind of communication isolation device that adopts unidirectional analogue transmission according to claim 1 is characterized in that, described communication interface modules adopts the RS-232 communication interface, and the used interface level transferring chip is ADM202.
3, a kind of communication isolation device that adopts unidirectional analogue transmission according to claim 1 is characterized in that, described data modulation circuitry is chip used to be AD420AR and MCP6002I.
4, a kind of communication isolation device that adopts unidirectional analogue transmission according to claim 1, its feature are that described private network and outer net communication interface modules CPU, encoding process, decoding processing, data demodulates treatment circuit are the DSPIC6012 chip.
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| CN 200810212143 CN101355484B (en) | 2008-09-08 | 2008-09-08 | Communication isolation device using unidirection analog transmission |
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| CN 200810212143 CN101355484B (en) | 2008-09-08 | 2008-09-08 | Communication isolation device using unidirection analog transmission |
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| CN101355484B CN101355484B (en) | 2012-11-07 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102088393B (en) * | 2009-12-02 | 2013-07-03 | 南京南瑞继保电气有限公司 | Method for transmitting positive and negative data across safety zone |
| CN103929417A (en) * | 2014-03-27 | 2014-07-16 | 中国科学院长春光学精密机械与物理研究所 | Security data interaction structure and method based on optical isolation technology |
| CN105812387A (en) * | 2016-05-09 | 2016-07-27 | 北京航天数控系统有限公司 | Unidirectional safe data exchange device |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103036876B (en) * | 2012-12-07 | 2016-03-23 | 福州和达电子科技有限公司 | A kind of Integral computer equipment and application thereof realizing unified operation under Network Isolation state |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201252556Y (en) * | 2008-09-08 | 2009-06-03 | 石家庄科林自动化有限公司 | Communication isolating device using unidirectional analogue transmission |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2703366Y (en) * | 2004-05-08 | 2005-06-01 | 青岛金弘测控技术发展有限公司 | Single direction transmission gateway for computer network |
| CN2850148Y (en) * | 2005-01-28 | 2006-12-20 | 朱寿祥 | Unidirectional physics isolation type network safety device |
| CN100521598C (en) * | 2006-02-09 | 2009-07-29 | 南京工业大学 | Method and system for realizing safety communication between internal and external networks of computer based on simplex communication principle |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201252556Y (en) * | 2008-09-08 | 2009-06-03 | 石家庄科林自动化有限公司 | Communication isolating device using unidirectional analogue transmission |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102088393B (en) * | 2009-12-02 | 2013-07-03 | 南京南瑞继保电气有限公司 | Method for transmitting positive and negative data across safety zone |
| CN103929417A (en) * | 2014-03-27 | 2014-07-16 | 中国科学院长春光学精密机械与物理研究所 | Security data interaction structure and method based on optical isolation technology |
| CN105812387A (en) * | 2016-05-09 | 2016-07-27 | 北京航天数控系统有限公司 | Unidirectional safe data exchange device |
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| CN101355484B (en) | 2012-11-07 |
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Address after: 050222, Hebei City, Shijiazhuang province red flag Street South, South Road, down wall section Applicant after: Shijiazhuang KE Electric Co.,Ltd. Address before: 050222, Hebei City, Shijiazhuang province red flag Street South, South Road, down wall section Applicant before: Shijiazhuang Kelin Automation Co., Ltd. |
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Owner name: HEBEI ELECTRIC POWER CORPORATION Effective date: 20120417 |
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Inventor after: Chen Hongyu Inventor after: Lv Yanshi Inventor after: Chen He Inventor after: Meng Guangmin Inventor after: Yang Libo Inventor after: Zhang Guoqiang Inventor after: Li Yuan Inventor after: Jin Weijing Inventor before: Jin Weijing Inventor before: Lv Yanshi Inventor before: Chen He Inventor before: Chen Hongyu Inventor before: Meng Guangmin Inventor before: Yang Libo |
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Free format text: CORRECT: INVENTOR; FROM: JIN WEIJING LV YANSHI CHEN HE CHEN HONGYU MENG GUANGMIN YANG LIBO TO: CHENHONGYU LV YANSHI CHEN HE MENG GUANGMIN YANG LIBO ZHANG GUOQIANG LI YUAN JIN WEIJING |
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Effective date of registration: 20120417 Address after: 050222, Hebei City, Shijiazhuang province red flag Street South, South Road, down wall section Applicant after: Shijiazhuang KE Electric Co.,Ltd. Co-applicant after: Hebei Electric Power Corporation Address before: 050222, Hebei City, Shijiazhuang province red flag Street South, South Road, down wall section Applicant before: Shijiazhuang KE Electric Co.,Ltd. |
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