CN105892299B - Computer remote control system and method based on serial ports connection - Google Patents
Computer remote control system and method based on serial ports connection Download PDFInfo
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- CN105892299B CN105892299B CN201610195976.8A CN201610195976A CN105892299B CN 105892299 B CN105892299 B CN 105892299B CN 201610195976 A CN201610195976 A CN 201610195976A CN 105892299 B CN105892299 B CN 105892299B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B15/00—Systems controlled by a computer
- G05B15/02—Systems controlled by a computer electric
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Abstract
The present invention relates to a kind of computer remote control systems and method based on serial ports connection, wherein system includes: control terminal,, far from the computer of controlled terminal, to be sent and received e-mail by internet on space length, being responsible for sending manipulation instruction and finally showing implementing result picture；Controlled terminal, the core computer being installed on enterprises production line connect corporate intranet, have remote assistance demand；Transfer end: for inner net computer, communication connection is carried out by Intranet with controlled terminal and mail server, is sent and received e-mail by mail server and the external world；Mail server: being set to enterprises, and transfer end is sent and received e-mail by mail server and the external world.The present invention using computer per se with RS232 serial ports communicate, guarantee that internal network is still within the state of physical isolation, it avoids virus attack from causing damages whole system, long-range control is realized in the case where controlled computer is not connect with the external world by cable.
Description
Technical field
The present invention relates to a kind of Computer Remote Control Technology, specifically a kind of computer based on serial ports connection is remote
Process control system and method.
Background technique
Enterprises generally have the internal network of oneself, are connected by safety equipments such as gateway, firewalls with internet,
Some Intranets even do not allow to surf the Internet, and can only send and receive e-mail.Some enterprises are distinguished according to different purposes
Multiple internal networks, such as the three-level network of user's routine office work, the primary network station for automation control.It is examined for safety
Consider, such primary network station inherently completely cuts off with the complete network physical of three-level.The computer of special occasions is if necessary to remote in this way
Journey is assisted, remote technology is supported, is to cannot achieve in the case where the isolation of other network physicals.
For example, the primary network station of certain iron and steel enterprise's production line automatic control system is a closed Intranet, checks and be used for
The chain condition of the PLC program of automatic control, is the important means for diagnosing all kinds of failures of production line, and PLC program is needed at this
It can be checked in the terminal of internal network, if professional technician is just not on post (for example have a holiday, go on business), just
Difficulty can be caused to fault diagnosis.If at this moment professional technician can remotely check and manipulate an inner computer and carry out
Remote technology supports that failure may exclude as early as possible.To realize remote assistance, it is common practice to, an Intranet is calculated
Machine installs two network interface cards, and a network interface card connects the Intranet of oneself, another network interface card is connect by another network with outer net, in this way
Professional technician can manipulate this inner computer by way of telnet.But thus there is great
Security risk, actual conditions are: the computer operating system under primary network station is still very old Windows2000 system, system
Loophole itself is very more, lacks security protection, and system is highly prone to the attack of each viroid, even if not attacked by outer net, also very
It may be by the computer attack of other virus infections, it is ensured that this is the peace that the closure of a network just can guarantee whole system
Entirely, therefore the double netcard scheme mentioned of top and infeasible.
Therefore in active computer remote controlled manner, controlled computer will by wired or wireless way directly or
It is connected to internet in succession, then using some third party softwares remotely controlled, to realize the purpose remotely controlled, but for one
Strictly and for the enterprises particular network of internet physical isolation, these control methods are simultaneously not suitable for a needs, because this
A particular network cannot be connected from system with regard to regulation with internet even other Intranets of enterprise.
Meanwhile in active computer remote controlled manner, controlled computer will by wired or wireless way directly or
It is connected indirectly to internet, as long as there is with network connection by the risk of worm-type virus attack, hacker attacks.
Summary of the invention
For needing strictly to cannot achieve calculating with the enterprises particular network of internet physical isolation in the prior art
The deficiencies of machine remote assistance, remote technology are supported, the technical problem to be solved in the present invention is to provide one kind both to realize physical network
The computer remote control system and method based on serial ports connection remotely controlled is realized in isolation again.
In order to solve the above technical problems, the technical solution adopted by the present invention is that:
The present invention it is a kind of based on serial ports connection computer remote control system, including control terminal, controlled terminal, transfer end with
And mail server, in which:
Control terminal is the computer on space length far from controlled terminal, is sent and received e-mail by internet, is responsible for transmission
Manipulation instruction simultaneously finally shows implementing result picture；
Controlled terminal, the core computer being installed on enterprises production line connect corporate intranet, and there is remote assistance to need
It asks；
Transfer end: for inner net computer, communication connection is carried out by Intranet with controlled terminal and mail server, passes through mail
Server is sent and received e-mail with the external world；
Mail server: being set to enterprises, and transfer end is sent and received e-mail by mail server and the external world.
The computer of controlled terminal, transfer end and mail server carries serial ports by USB RS 232 serial port data line generation
It replaces.
Controlled terminal, transfer end connect multipair serial port connecting wire, and the string data of a picture is divided into multiple groups while passing
It is defeated.
Controlled terminal computer installs high definition video collecting card, and controlled terminal image is sent directly to by high definition video collecting card
Transfer end.
The present invention is based on the computer remote control methods of serial ports connection, comprising the following steps:
Control terminal sends mouse-keyboard instruction to mail server by internet；
Mail is sent transfer end by mail server；
Transfer terminates receiving emails, and the mouse-keyboard in mail is instructed and is sent to controlled terminal by serial ports；
Controlled terminal receives the instruction sent by serial ports and executes screenshot capture, and screenshot coding of graphics passes through at character string
Serial ports is sent to transfer end；
Transfer end sends mail server by mail for the coding of graphics character string received；
Control terminal receives the mail for having picture character string, and character data is converted to picture and shows display in control terminal
On device, remote control person continues to execute operation according to the picture of return.
After screenshot capture, compression processing is carried out first, is encoded into character string using base64.
The communication speed of serial ports is set as 380000Bd.
Mouse-keyboard instruction format be [xxxx:xxxx]<?>{ xxxx }, wherein:
[xxxx:xxxx] indicates mouse coordinates,<?>indicate mouse action, prolonging after one mouse action of { xxxx } expression
When, unit is millisecond.
Mouse instructions assist generating by control terminal, and mouse clicking operation on echo picture compiles corresponding format
Instruction.
Controlled terminal screen resolution shows the in the same size of picture with control terminal, guarantees that mouse coordinates are consistent at two.
The invention has the following beneficial effects and advantage:
1. the present invention is by the computer program write, using computer per se with RS232 serial ports communicated, protect
Card internal network is still within the state of physical isolation, to avoid virus attack from causing damages whole system, in controlled meter
Calculation machine realizes long-range control in the case where not connecting with the external world by cable.
2. the present invention can use multipair serial port connecting wire, the string data of a picture is divided into multiple groups while being passed
It is defeated, the echo time of screenshot picture can be greatly shortened in this way；It replaces calculating by the USB RS 232 serial port data line of purchase
Machine carries serial ports, to obtain bigger transmission speed.
3. the present invention utilizes mail server interim data and instruction, lower to controlled terminal and control terminal requirement, even if net
Network limitation, as long as being capable of receiving and dispatching mail, so that it may guarantee system worked well.
4. the present invention is at low cost, is rectified and improved under existing resource, do not need to inject capital into substantially.
Detailed description of the invention
Fig. 1 is present system overall arrangement figure；
Fig. 2 is the control flow chart of present system.
Specific embodiment
The present invention is further elaborated with reference to the accompanying drawings of the specification.
As shown in Figure 1, the present invention is based on serial ports connection computer remote control system, including control terminal, controlled terminal, in
Turn end and mail server, in which:
Controlled terminal, the core computer being installed on enterprises production line connect corporate intranet, and there is remote assistance to need
It asks；
Control terminal is the computer on space length far from controlled terminal, is sent and received e-mail by internet, is responsible for transmission
Manipulation instruction simultaneously finally shows implementing result picture；
Transfer end: for inner net computer, communication connection is carried out by Intranet with controlled terminal and mail server；
Mail server: being set to enterprises, and transfer end is sent and received e-mail by mail server and the external world.
Since the serial ports maximum baud rate that general computer carries is only 128000, in order to improve transmission speed, pass through purchase
The USB RS 232 serial port data line bought replaces computer to carry serial ports, to obtain bigger transmission speed.In order to further mention
The string data of one picture is divided into multiple groups simultaneous transmission using multipair serial port connecting wire by the rate of high serial ports transmission,
The echo time of screenshot picture can be greatly shortened in this way.
Since baud rate is the major parameter for determining serial communication speed, baud rate is bigger, and speed is faster, but baud rate
When greatly to a certain extent, the bit error rate can also be greatly increased, thus baud rate to be arranged it is appropriate, meet quickly with it is stable
Under the premise of, it is proper to be set as 380000 in actual use.
Since the string data that the bigger screenshot of resolution ratio is converted into is more, transmission time is longer, therefore point of controlled terminal
Resolution will be turned down as far as possible, and 1024*768 is proper in practice.Controlled terminal screen resolution will show picture with control terminal simultaneously
Face it is in the same size, with guarantee two at mouse coordinates it is consistent.
If screenshot image data is not sent by serial ports, but by VGA high definition video collecting card, image is directly sent out
It is sent to transfer computer.Serial communication is only responsible for sending mouse control instruction.Screenshot echo can be reduced to greatest extent in this way
Delay.
VGA high definition video collecting card higher cost, needs in addition to buy.If not adopting VGA high definition video collecting card, this hair
It is bright to be carried out under existing resource, it does not need to inject capital into substantially.
As shown in Fig. 2, the computer remote control method based on serial ports connection, comprising the following steps:
Control terminal sends mouse-keyboard instruction to mail server by internet；
Mail is sent transfer end by mail server；
Transfer terminates receiving emails, and the mouse-keyboard in mail is instructed and is sent to controlled terminal by serial ports；
Controlled terminal receives the instruction sent by serial ports and executes screenshot capture, and screenshot coding of graphics passes through at character string
Serial ports is sent to transfer end；
Transfer end sends mail server by mail for the coding of graphics character string received；
Control terminal receives the mail for having picture character string, and character data is converted to picture and shows display in control terminal
On device, remote control person continues to execute operation according to the picture of return.
In the method for the present invention, the screenshot of controlled terminal will pass through compression processing, then be encoded into character string by base64, just
It is transmitted in by serial ports.
Since baud rate is the major parameter for determining serial communication speed, baud rate is bigger, and speed is faster, but baud rate
When greatly to a certain extent, the bit error rate can also be greatly increased, thus baud rate to be arranged it is appropriate, meet quickly with it is stable
Under the premise of, it is proper to be set as 380000 in actual use.
Mouse-keyboard instruction format be [xxxx:xxxx]<?>{ xxxx }, wherein:
[xxxx:xxxx] indicates mouse coordinates,<?>indicate mouse action, for example L is clicked, right click R double-clicks D etc.,
{ xxxx } indicates the delay after a mouse action, and unit is millisecond.
In order to save the echo time, multiple mouse actions can be sent simultaneously, controlled terminal only returns after executing multiple movements
One echo screenshot.
Mouse instructions assist generating by control terminal, and mouse clicking operation, program on echo picture compile phase automatically
Answer the instruction of format.
The present invention passes through the computer program write, using computer per se with RS232 serial ports communicated, communicate
Content there was only string data, sending and receiving for character string is all the process control write, guarantee internal network still locate
In the state of physical isolation, so that virus attack be avoided to cause damages whole system.The content of serial communication is two-way, and one
It is the instructions such as mouse coordinates, click action, percussion keyboard, weaves into the character string of specific format；One is figure after screen shot
Picture string data of the piece after overcompression, coding.It is communicated using both character strings, realization is controlled and echoed control knot
Fruit.A mail server is used simultaneously, with the mode of mail by both character string transfers, realizes the mesh remotely controlled
's.
It is lower to controlled terminal and control terminal requirement using mail server interim data and instruction, even if network limits, only
Being capable of receiving and dispatching mail, so that it may guarantee system worked well.
Claims (5)
1. a kind of control method of the computer remote control system based on serial ports connection, it is characterised in that the following steps are included:
Control terminal sends mouse-keyboard instruction to mail server by internet；
Mail is sent transfer end by mail server；
Transfer terminates receiving emails, and the mouse-keyboard in mail is instructed and is sent to controlled terminal by serial ports；
Controlled terminal receives the instruction sent by serial ports and executes screenshot capture, and screenshot coding of graphics passes through serial ports at character string
It is sent to transfer end；
Transfer end sends mail server by mail for the coding of graphics character string received；
Control terminal receives the mail for having picture character string, and character data is converted to picture and shows display in control terminal
On, remote control person continues to execute operation according to the picture of return；
Mouse-keyboard instruction format be [xxxx:xxxx]<?>{ xxxx }, wherein:
[xxxx:xxxx] indicates mouse coordinates,<?>indicate mouse action, { xxxx } indicates the delay after a mouse action, single
Position is millisecond；
Mouse instructions assist generating by control terminal, and mouse clicking operation on echo picture compiles the instruction of corresponding format；
Control system includes control terminal, controlled terminal, transfer end and mail server, in which:
Control terminal is the computer on space length far from controlled terminal, is sent and received e-mail by internet, is responsible for sending manipulation
It instructs and finally shows implementing result picture；
Controlled terminal, the core computer being installed on enterprises production line connect corporate intranet, have remote assistance demand；
Transfer end: for inner net computer, communication connection is carried out by Intranet with controlled terminal and mail server, passes through mail service
Device is sent and received e-mail with the external world；
Mail server: being set to enterprises, and transfer end is sent and received e-mail by mail server and the external world；
The computer of controlled terminal, transfer end and mail server carries serial ports and is replaced by USB RS 232 serial port data line；
Controlled terminal, transfer end connect multipair serial port connecting wire, and the string data of a picture is divided into multiple groups simultaneous transmission.
2. the control method of the computer remote control system according to claim 1 based on serial ports connection, it is characterised in that:
After screenshot capture, compression processing is carried out first, is encoded into character string using base64.
3. the control method of the computer remote control system according to claim 1 based on serial ports connection, it is characterised in that:
The communication speed of serial ports is set as 380000Bd.
4. the control method of the computer remote control system according to claim 1 based on serial ports connection, it is characterised in that:
Controlled terminal screen resolution shows the in the same size of picture with control terminal, guarantees that mouse coordinates are consistent at two.
5. the control method of the computer remote control system according to claim 1 based on serial ports connection, it is characterised in that:
Controlled terminal computer installs high definition video collecting card, and controlled terminal image is sent directly to transfer end by high definition video collecting card.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610195976.8A CN105892299B (en) | 2016-03-30 | 2016-03-30 | Computer remote control system and method based on serial ports connection |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610195976.8A CN105892299B (en) | 2016-03-30 | 2016-03-30 | Computer remote control system and method based on serial ports connection |
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| CN105892299B true CN105892299B (en) | 2019-05-03 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107967184A (en) * | 2017-11-30 | 2018-04-27 | 北京奇艺世纪科技有限公司 | Method of attaching, device and electronic equipment are replicated in remote assistance |
| CN110311904B (en) * | 2019-06-26 | 2021-11-16 | 沃通电子认证服务有限公司 | Internet of things communication method, device, terminal and computer storage medium |
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| CN205485371U (en) * | 2016-03-30 | 2016-08-17 | 本钢板材股份有限公司 | Computer remote control system based on serial port connection |
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| US20020104021A1 (en) * | 2001-01-31 | 2002-08-01 | Gross Curtis T. | Resource sharing across security boundaries |
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| CN101459608A (en) * | 2008-12-08 | 2009-06-17 | 上海华平信息技术股份有限公司 | Resource sharing method for internal and external network |
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