CN110958224A - Remote serial port debugging system and method - Google Patents
Remote serial port debugging system and method Download PDFInfo
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- CN110958224A CN110958224A CN201911072561.1A CN201911072561A CN110958224A CN 110958224 A CN110958224 A CN 110958224A CN 201911072561 A CN201911072561 A CN 201911072561A CN 110958224 A CN110958224 A CN 110958224A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/04—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks
- H04L63/0428—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks wherein the data content is protected, e.g. by encrypting or encapsulating the payload
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/08—Network architectures or network communication protocols for network security for authentication of entities
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/08—Network architectures or network communication protocols for network security for authentication of entities
- H04L63/0823—Network architectures or network communication protocols for network security for authentication of entities using certificates
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/08—Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
- H04L9/0816—Key establishment, i.e. cryptographic processes or cryptographic protocols whereby a shared secret becomes available to two or more parties, for subsequent use
- H04L9/0838—Key agreement, i.e. key establishment technique in which a shared key is derived by parties as a function of information contributed by, or associated with, each of these
Abstract
The invention provides a remote serial port debugging system, which comprises: the upper computer comprises a virtual serial port, a first serial port conversion module, a first safety module and a first communication module, and upper computer software sends or receives serial port data by using the virtual serial port; the first serial port conversion module is used for converting serial port data and network data into each other; the first security module is used for encrypting and decrypting the network data; the first communication module is used for sending or receiving a network data ciphertext; the industrial equipment comprises a second communication module, a second safety module, a second serial port conversion module and an industrial personal computer, wherein the second communication module is in network communication connection with the first communication module and is used for sending or receiving a network data ciphertext; the second security module is used for encrypting and decrypting the network data; the second serial port conversion module is connected to the industrial personal computer through a serial port line and used for mutual conversion of serial port data and network data. In addition, the invention also provides a remote serial port debugging method.
Description
Technical Field
The invention relates to the technical field of industrial automation, in particular to a remote serial port debugging system and method.
Background
The emergence and popularization of industrial control technology brings a third industrial revolution, and the production speed and efficiency of factories are effectively improved. However, with the development of computer technology and communication technology, the traditional industrial control field is undergoing an unprecedented revolution. For example, in the conventional industrial control, during the work processes of information acquisition, program upgrading, equipment debugging and the like of industrial equipment, an operator needs to enter an industrial field, an upper computer (such as a PC) is connected to the industrial equipment through a serial port line, and corresponding operation works of information acquisition, program upgrading, equipment debugging and the like are performed through upper computer software.
Disclosure of Invention
In view of the above, there is a need to provide a remote serial port debugging system and method, which can implement remote operation work such as information acquisition, program upgrading, device debugging and the like on an industrial device, effectively reduce the cost of operating personnel entering a field for operation, and have high convenience.
The invention provides a remote serial port debugging system, comprising:
the upper computer comprises a virtual serial port, a first serial port conversion module, a first safety module and a first communication module, wherein upper computer software is installed on the upper computer, and the upper computer software sends or receives serial port data by using one port of the virtual serial port; the first serial port conversion module is connected to the other port of the virtual serial port and used for realizing the mutual conversion of serial port data and network data; the first security module is connected to the first serial port conversion module and the first communication module and is used for encrypting and decrypting network data; the first communication module is connected to the first security module and used for sending or receiving a network data ciphertext; and
the industrial equipment comprises a second communication module, a second safety module, a second serial port conversion module and an industrial personal computer, wherein the second communication module is in network communication connection with the first communication module and is used for sending or receiving a network data ciphertext; the second security module is connected to the second communication module and the second serial port conversion module and is used for encrypting and decrypting network data; the second serial port conversion module is connected to the industrial personal computer through a serial port line and is used for realizing the mutual conversion of serial port data and network data; the industrial personal computer is used for detecting and controlling the production process and various equipment.
Furthermore, the second security module and the first security module are matched with each other to realize identity authentication and key agreement between the upper computer and the industrial equipment.
Further, the first security module and the second security module support a Diffie-Hellman key agreement algorithm, a symmetric cryptographic algorithm, an asymmetric cryptographic algorithm, and a hash, hash cryptographic algorithm, respectively.
Furthermore, a virtual serial port is created by using a COM0COM virtual serial port driver to connect the two COM ports, the write data on one COM port can be read out from the other COM port, the first serial port conversion module actively monitors one COM port, and the upper computer software uses the other COM port.
Further, the industrial personal computer is a programmable controller; and/or
The second serial port conversion module is a serial to network.
Preferably, the upper computer is an electronic device such as a mobile phone, a PAD, and a PC.
In addition, the invention also provides a remote serial port debugging method, which comprises the following steps:
the upper computer and the industrial equipment establish a secure network connection;
the method comprises the following steps that upper computer software opens a virtual serial port and sends first serial port data to the virtual serial port, a first serial port conversion module converts the first serial port data into first network data, and a first network data ciphertext is obtained through encryption of a first security module;
the first communication module of the upper computer sends the first network data ciphertext to the industrial equipment;
a second communication module of the industrial equipment receives the first network data ciphertext, the first network data plaintext is obtained through decryption of a second security module, and the first network data plaintext is converted into first serial port data through a second serial port conversion module and is sent to an industrial personal computer;
the industrial personal computer returns second serial port data, the second serial port conversion module converts the second serial port data into second network data, and the second network data is encrypted by the second security module to obtain a second network data ciphertext;
the second communication module sends the second network data ciphertext to the upper computer; and
the first communication module receives the second network data ciphertext, the first security module decrypts the second network data ciphertext to obtain a second network data plaintext, the second network data plaintext is converted into second serial port data through the first serial port conversion module, and the second serial port data plaintext is forwarded to the upper computer software through the virtual serial port.
Further, the upper computer and the industrial equipment establish a secure network connection, and the method specifically includes:
and bidirectional identity authentication and key agreement between the upper computer and the industrial equipment are realized through the first security module and the second security module, and transmitted data are encrypted through a shared key to establish secure network connection.
Further, before the upper computer and the industrial equipment establish the secure network connection, the method further comprises the following steps:
presetting or importing a digital certificate of the upper computer and a root certificate of the third party authentication management system in a first security module of the upper computer through the third party authentication management system; and presetting or importing the digital certificate of the industrial equipment and the root certificate of the third party authentication management system in a second security module of the industrial equipment.
Preferably, a fixed time threshold or a data packet threshold is preset, and when the accumulated time or the accumulated number of data packets reaches the preset threshold, key agreement between the upper computer and the industrial equipment is carried out again.
According to the remote serial port debugging system and method, the first serial port conversion module is arranged on the upper computer, the second serial port conversion module is arranged on the industrial equipment, so that serial port data and network data are converted, network transmission of serial port equipment information is realized, an operator can realize work such as information acquisition, program upgrading and equipment debugging of the industrial equipment without entering an industrial field, labor cost is effectively reduced, and convenience is further improved.
In addition, the remote serial port debugging system and the remote serial port debugging method of the invention also ensure the privacy, the integrity and the non-repudiation of the whole communication process and prevent the communication content from being leaked or tampered by installing the first security module and the second security module on the upper computer and the industrial equipment and carrying out encryption and decryption processing on the transmission data through the first security module and the second security module.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic diagram of a remote serial port debugging system according to an embodiment of the present invention.
Fig. 2 is a flowchart of a remote serial port debugging method according to an embodiment of the present invention.
Description of the main elements
| Remote serial |
100 |
| |
10 |
| Virtual serial port | 11 |
| First serial |
12 |
| |
13 |
| |
14 |
| |
20 |
| |
21 |
| |
22 |
| Second serial |
23 |
| Industrial control machine | 24 |
The following detailed description will further illustrate the invention in conjunction with the above-described figures.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
The serial communication sends and receives bytes according to bit, and the serial communication adopts three lines (ground line, sending line, receiving line) to complete the communication work. Serial communication is asynchronous, i.e., one line is used to transmit data while the other line is used to receive data. The most important parameters for serial communication are baud rate, data bits, stop bits and parity.
Referring to fig. 1, an embodiment of the present invention provides a remote serial port debugging system 100, which includes an upper computer 10 and an industrial device 20, where the industrial device 20 is located in an industrial field, the upper computer 10 is located outside the industrial field, and the upper computer 10 and the industrial device 20 are in communication connection via a network (Internet).
The upper computer 10 comprises a virtual serial port 11, a first serial port conversion module 12, a first safety module 13 and a first communication module 14, upper computer software is installed on the upper computer 10, and the upper computer software uses one port of the virtual serial port 11 and sends or receives serial port data through the port; the first serial port conversion module 12 is connected to the other port of the virtual serial port 11, and is configured to implement mutual conversion between serial port data and network data; the first security module 13 is connected to the first serial port conversion module 12 and the first communication module 14, and is configured to encrypt and decrypt network data, in this embodiment, the first security module 13 supports a Diffie-Hellman key agreement algorithm, a symmetric cryptographic algorithm, an asymmetric cryptographic algorithm, and a hash or hash cryptographic algorithm; the first communication module 14 is connected to the first security module 13, and transmits or receives network data cryptograph to or from the industrial device 20 via a network link.
It can be understood that the virtual serial port 11 is a serial port generated by using a virtual driver technology of an operating system of the upper computer 10, and the virtual serial port 11 does not correspond to a physical serial port relative to a hardware serial port of the upper computer 10 itself, but the upper computer software can use the virtual serial port 11 like the hardware serial port.
Specifically, a virtual serial port driver in the windows kernel mode COM0COM may be used, which may create a virtual serial port to connect two COM ports, where write data may be read from one COM port and vice versa. The first serial port conversion module 12 actively listens to one of the COM ports, and the upper computer software uses the other COM port, which has the same effect as the port generated by the real serial port line directly connected to the industrial device 20.
The industrial device 20 includes a second communication module 21, a second security module 22, a second serial port conversion module 23, and an industrial personal computer 24. The second communication module 21 establishes network communication connection with the first communication module 14, and is used for receiving a network data ciphertext from the upper computer 10 or sending the network data ciphertext to the upper computer 10; the second security module 22 is connected to the second communication module 21 and the second serial port conversion module 23, and is configured to encrypt and decrypt network data, and the second security module 22 and the first security module 13 cooperate with each other to implement identity authentication and key agreement between the upper computer 10 and the industrial device 20; in this embodiment, the second security module 22 supports Diffie-Hellman key agreement algorithm, symmetric cipher algorithm, asymmetric cipher algorithm, and hash, hash cipher algorithm; the second serial port conversion module 23 is connected to the industrial personal computer 24 through a serial port line, and is used for realizing the interconversion between serial port data and network data; the industrial personal computer 24 is used for detecting and controlling the production process and various equipment.
Preferably, the industrial personal computer 24 is a Programmable Logic Controller (PLC) which employs a programmable memory, stores therein instructions for performing operations such as logic operation, sequence control, timing, counting, and arithmetic operation, and controls various types of mechanical devices or production processes through digital or analog input and output.
In this embodiment, the second serial port conversion module 23 selects a ser2 network (serial to network), which can perform mutual conversion between serial port data and network data. The ser2net is an open source tool, has good portability and stability, is transplanted to the industrial equipment 20, and is responsible for forwarding data sent by the upper computer software to the serial port/dev/ttyS 0 of the second serial port conversion module 23 and then to the target industrial personal computer 24. The configuration file used by ser2net is ser2net. conf, the lan port ip of the second serial port conversion module 23 is 195.180.4.1, and the monitoring port is 2002, for example, the preferred configuration of the operation is as follows: 195.180.4.1,2002 raw 0/dev/ttyS 0:115200 NON 1STOPBIT 8DATABITS
The corresponding relationship of the configuration items is shown in the following table:
| 195.180.4.1:2002 | snooping addresses |
| raw | Raw data |
| 0 | Time-out |
| /dev/ttyS0 | Specified use serial port |
| 115200 | Baud rate |
| NONE | Parity-free check |
| 1StopBIT | 1 position stop position |
| 8DATABITS | 8 bit data bits |
It is understood that the upper computer 10 is an electronic device such as a mobile phone, a PAD, or a PC.
Referring to fig. 2, the present invention further provides a remote serial port debugging method, which includes the following steps:
step 1, a host computer 10 and industrial equipment 20 establish secure network connection;
specifically, the first security module 13 and the second security module 22 are used for realizing bidirectional identity authentication and key agreement between the upper computer 10 and the industrial equipment 20, encrypting transmission data by using a shared key, and establishing secure network connection;
step 2, the upper computer software opens the virtual serial port 11 and sends first serial port data to the virtual serial port 11, the first serial port conversion module 12 converts the first serial port data into first network data, and the first network data ciphertext is obtained through encryption of the first security module 13;
step 3, the first communication module 14 of the upper computer 10 sends the first network data ciphertext to the industrial equipment 20;
step 4, the second communication module 21 of the industrial equipment 20 receives the first network data ciphertext, the first network data plaintext is obtained by decryption of the second communication module 22, and the first network data ciphertext is converted into first serial port data through the second serial port conversion module 23 and is sent to the industrial personal computer 24;
step 5, the industrial personal computer 24 of the industrial equipment 20 returns second serial port data, the second serial port conversion module 23 converts the second serial port data into second network data, and the second network data is encrypted by the second security module 22 to obtain a second network data ciphertext;
step 6, the second communication module 21 of the industrial equipment 20 sends the second network data ciphertext to the upper computer 10;
and 7, the first communication module 14 of the upper computer 10 receives the second network data ciphertext, the first security module 13 decrypts the second network data ciphertext to obtain a second network data plaintext, the second network data plaintext is converted into second serial data through the first serial port conversion module 12, and the second serial data is forwarded to the upper computer software through the virtual serial port 11.
In other embodiments of the present invention, before performing step 1, the method further includes:
through a third party authentication management system, a first security module 13 of an upper computer 10 presets or imports a digital certificate of the upper computer and a root certificate of the third party authentication management system; and presets or imports the digital certificate of the industrial device 20 and the root certificate of the third party certification management system in the second security module 22 of the industrial device 20.
In the communication process, a fixed time threshold or a data packet threshold can be preset, and when the accumulated time or the accumulated number of data packets reaches the preset threshold, key negotiation between the upper computer 10 and the industrial equipment 20 is carried out again, so that the safety of communication between the upper computer 10 and the industrial equipment 20 can be ensured.
According to the remote serial port debugging system and method, the first serial port conversion module 12 is arranged on the upper computer 10, and the second serial port conversion module 23 is arranged on the industrial equipment 20, so that serial port data and network data are converted, network transmission of serial port equipment information is realized, an operator can realize work such as information acquisition, program upgrading and equipment debugging of the industrial equipment without entering an industrial field, labor cost is effectively reduced, and convenience is further improved.
In addition, the remote serial port debugging system and method of the invention also ensure the privacy, integrity and non-repudiation of the whole communication process and prevent the communication content from being leaked or tampered by installing the first security module 13 and the second security module 22 on the upper computer 10 and the industrial equipment 20 and performing encryption and decryption operations on the transmission data through the first security module 13 and the second security module 22.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A remote serial port debugging system is characterized by comprising:
the upper computer comprises a virtual serial port, a first serial port conversion module, a first safety module and a first communication module, wherein upper computer software is installed on the upper computer, and the upper computer software sends or receives serial port data by using one port of the virtual serial port;
the first serial port conversion module is connected to the other port of the virtual serial port and used for realizing the mutual conversion of serial port data and network data;
the first security module is connected to the first serial port conversion module and the first communication module and is used for encrypting and decrypting network data; the first communication module is connected to the first security module and used for sending or receiving a network data ciphertext; and
the industrial equipment comprises a second communication module, a second safety module, a second serial port conversion module and an industrial personal computer, wherein the second communication module is in network communication connection with the first communication module and is used for sending or receiving a network data ciphertext; the second security module is connected to the second communication module and the second serial port conversion module and is used for encrypting and decrypting network data; the second serial port conversion module is connected to the industrial personal computer through a serial port line and is used for realizing the mutual conversion of serial port data and network data; the industrial personal computer is used for detecting and controlling the production process and various equipment.
2. The remote serial port debugging system of claim 1, wherein the second security module is mutually matched with the first security module to realize identity authentication and key agreement between the upper computer and the industrial equipment.
3. The remote serial port debugging system of claim 1, wherein the first security module and the second security module support a Diffie-Hellman key agreement algorithm, a symmetric cryptographic algorithm, an asymmetric cryptographic algorithm, and a hash, hash cryptographic algorithm, respectively.
4. The remote serial port debugging system of claim 1, wherein a COM0COM virtual serial port driver is used to create a virtual serial port to connect two COM ports, write data on one COM port can be read from the other COM port, the first serial port conversion module actively monitors one COM port, and the upper computer software uses the other COM port.
5. The remote serial port debugging system of claim 1, wherein the industrial personal computer is a programmable controller; and/or
The second serial port conversion module is a serial to network.
6. The remote serial port debugging system according to any one of claims 1 to 5, wherein the upper computer is an electronic device such as a mobile phone, a PAD, or a PC.
7. A remote serial port debugging method for applying the remote serial port debugging system of any one of claims 1 to 6, characterized in that the debugging method comprises the following steps:
the upper computer and the industrial equipment establish a secure network connection;
the method comprises the following steps that upper computer software opens a virtual serial port and sends first serial port data to the virtual serial port, a first serial port conversion module converts the first serial port data into first network data, and a first network data ciphertext is obtained through encryption of a first security module;
the first communication module of the upper computer sends the first network data ciphertext to the industrial equipment;
a second communication module of the industrial equipment receives the first network data ciphertext, the first network data plaintext is obtained through decryption of a second security module, and the first network data plaintext is converted into first serial port data through a second serial port conversion module and is sent to an industrial personal computer;
the industrial personal computer returns second serial port data, the second serial port conversion module converts the second serial port data into second network data, and the second network data is encrypted by the second security module to obtain a second network data ciphertext;
the second communication module sends the second network data ciphertext to the upper computer; and
the first communication module receives the second network data ciphertext, the first security module decrypts the second network data ciphertext to obtain a second network data plaintext, the second network data plaintext is converted into second serial port data through the first serial port conversion module, and the second serial port data plaintext is forwarded to the upper computer software through the virtual serial port.
8. The remote serial port debugging method according to claim 7, wherein the establishing of the secure network connection between the upper computer and the industrial device specifically comprises:
and bidirectional identity authentication and key agreement between the upper computer and the industrial equipment are realized through the first security module and the second security module, and transmitted data are encrypted through a shared key to establish secure network connection.
9. The remote serial port debugging method of claim 7, further comprising, before the upper computer and the industrial device establish the secure network connection:
presetting or importing a digital certificate of the upper computer and a root certificate of the third party authentication management system in a first security module of the upper computer through the third party authentication management system; and presetting or importing the digital certificate of the industrial equipment and the root certificate of the third party authentication management system in a second security module of the industrial equipment.
10. The remote serial port debugging method of claim 7, wherein a fixed time threshold or a data packet threshold is preset, and when the accumulated time or the accumulated number of data packets reaches the preset threshold, key negotiation between the upper computer and the industrial equipment is performed again.
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| CN111935109A (en) * | 2020-07-24 | 2020-11-13 | 郑州信大捷安信息技术股份有限公司 | Secure communication module remote agent system, private protocol implementation method and device |
| CN112165411A (en) * | 2020-09-18 | 2021-01-01 | 广东中认华南检测技术有限公司 | Method and system for monitoring transmission data based on controller |
| CN114500627A (en) * | 2021-12-27 | 2022-05-13 | 南京南瑞继保电气有限公司 | Method, device and equipment for remotely accessing serial port equipment and storage medium |
| CN115987688A (en) * | 2023-03-20 | 2023-04-18 | 北京网藤科技有限公司 | Method and system for guaranteeing safe communication between PLC and upper computer |
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