CN104993913A - Reliable communication method under unstable communication link environment - Google Patents
Reliable communication method under unstable communication link environment Download PDFInfo
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- CN104993913A CN104993913A CN201510424944.6A CN201510424944A CN104993913A CN 104993913 A CN104993913 A CN 104993913A CN 201510424944 A CN201510424944 A CN 201510424944A CN 104993913 A CN104993913 A CN 104993913A
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- 238000004891 communication Methods 0.000 title claims abstract description 110
- 238000000034 method Methods 0.000 title claims abstract description 35
- 230000003993 interaction Effects 0.000 claims abstract description 16
- 230000005540 biological transmission Effects 0.000 claims abstract description 14
- 230000004044 response Effects 0.000 claims description 28
- 230000002452 interceptive effect Effects 0.000 claims description 10
- 230000001360 synchronised effect Effects 0.000 claims description 10
- 230000008569 process Effects 0.000 description 7
- 230000007423 decrease Effects 0.000 description 4
- 230000001934 delay Effects 0.000 description 4
- 230000006872 improvement Effects 0.000 description 4
- 230000000739 chaotic effect Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000000977 initiatory effect Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
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- Quality & Reliability (AREA)
- Computer And Data Communications (AREA)
Abstract
The invention provides a reliable communication method under an unstable communication link environment. The method is improved based on a standard Modbus communication protocol. A main controller is communicated with a subordinate controller; the subordinate controller receives an instruction transmitted by the main controller, and the communication protocol uses the format of the Modbus communication protocol. The method comprises the steps as follows: A, the main controller generates the instruction and ID information which is not repeated within a period of time and transmits to the subordinate controller; B, the subordinate controller responds the instruction and enables the responding content to contain the ID information questioned every time; the main controller and the subordinate controller perform communication data interaction instruction once to read and write a discontinuous address. The reliable communication method of the invention solves the problem that the questions and answers of two interacted parties are wrong brought by network transmission delay under an unstable network, reduces the times of operating discrete distribution address data, and improves efficiency and reliability of data communication.
Description
Technical field
The present invention relates to communication technical field, particularly relate to a kind of reliable communication method under unstable communication link environment.
Background technology
Along with the development of the Internet, increasing conventional electronic devices is no longer satisfied with and is connected with main frame simply by RS232 serial ports, RS485 serial ports or USB port, they more wish to be connected by the Internet and main frame, more there is equipment, wish by cell phone network, set up long-range connection with main frame internet wireless, form huge Internet of Things.
In general, separate unit main frame can be connected with multiple electronic equipment by RS485 bus, and main frame and electric room adopt Modbus communication protocol, and main frame and electronic equipment are master-slave equipment relations, and main frame any time and arbitrary equipment can carry out data interaction.Modbus communication protocol is by address sequential organization main equipment from low to high and from the communication data between equipment, no matter main frame reads from electronic equipment, or write data, the value of one section of continuation address can only be operated all at most.
In addition, Modbus communication protocol adopts a kind of catechetical data interactive mode, its basic logic is, enquirement side relies on response time, and whether time-out judges whether reply party has response, and this logic existing defects, if transmission link exists transmission delay, and this delay time is indefinite, probably the 2nd time, even the 3rd enquirement can receive the response of the 1st time, causes response chaotic.
So, in the network environment of unstable link, Modbus communication protocol has not been suitable for the data communication between main frame and various electronic equipment, and be not certainly suitable for main frame yet and monitored various electronic equipment by the Internet, the real-time of monitoring does not reach requirement yet.
Summary of the invention
For above-mentioned prior art, technical problem to be solved by this invention is to provide a kind of reliable communication method under unstable communication link environment, reliable communication method under unstable communication link environment should solve the problem of the mutual both sides' question and answer entanglement caused because of Network Transmission Delays under unstable network, decrease the number of times to discrete distribution address data manipulation, improve efficiency and the reliability of data communication.
In order to solve the problems of the technologies described above, the invention provides a kind of reliable communication method under unstable communication link environment, this method improves on the Modbus communication protocol basis of standard; Master controller communicates with from controller, receives the instruction of master controller transmission from controller, and communication protocol adopts Modbus communications protocol format, comprises the following steps:
A. master controller generates instruction and the id information that can not repeat within a period of time and sends to from controller;
B. from controller response made to instruction and response content, comprise each id information of puing question to.
Further improvement of the present invention is, described steps A comprises step by step following:
A1. master controller generates instruction and the id information that can not repeat within a period of time;
A2. master controller sends instruction and id information to from controller.
Further improvement of the present invention is, master controller with carry out a communication data interactive command from controller and just can realize reading and writing discontinuous address field.
Further improvement of the present invention is, master controller and adopt RS-232 serial ports or RS-422 serial ports or RS-485 serial ports or USB port from communication interface between controller.
Further improvement of the present invention is, the protocol frame of the method is as follows:
Device address: with Modbus communication protocol synonym;
Function code: code 0x36 represents reading order, code 0x37 represents write order, all the other codes and Modbus communication protocol synonym;
Content frame length: represent byte length summation shared by the synchronous ID frame field of dialogue and content frame field;
Talk with synchronous ID: any number of master controller definition, returns identical value from controller this frame field returning response;
Content: interaction data deposits frame field, except when function code is 0x36,0x37, this frame field has Additional definitions, during all the other function codes, the definition of this frame field and Modbus communication protocol data frame field synonym.
Compared with prior art, the id information that the present invention adopts master controller to be created on can not to repeat in a period of time and and data send in the lump from controller, from controller response content, comprise the id information of each enquirement; Master controller with carry out a communication data interactive command from controller and just can realize reading and writing discontinuous address field.The invention solves the problem of the mutual both sides' question and answer entanglement caused because of Network Transmission Delays under unstable network, decrease the number of times to discrete distribution address data manipulation, improve efficiency and the reliability of data communication.
Accompanying drawing explanation
Fig. 1 be prior art main frame with from equipment by RS458 bus short distance connection diagram;
Fig. 2 is Modbus communication protocol frame format;
Fig. 3 is the list of Modbus communication protocol functions code;
Fig. 4 is the 0x03 function code reciprocal process figure of Modbus communication protocol;
Fig. 5 is 0x10 (16) the function code reciprocal process figure of Modbus communication protocol;
Fig. 6 is protocol frame format of the present invention;
Fig. 7 is 0x36 reading order protocol frame format of the present invention;
Fig. 8 is that 0x36 reading order of the present invention returns protocol frame format;
Fig. 9 is that 0x37 of the present invention writes bidding protocol frame format;
Figure 10 is that 0x37 of the present invention write order returns protocol frame format;
Figure 11 is the value that 3 sections of discontinuous address fields are read in the timing of Modbus communication protocol;
Figure 12 is the value that 3 sections of discontinuous address fields are read in timing of the present invention.
Embodiment
Illustrate below in conjunction with accompanying drawing and embodiment the present invention is further described.
A reliable communication method under unstable communication link environment, this method improves on the Modbus communication protocol basis of standard; Master controller communicates with from controller, receives the instruction of master controller transmission from controller, and communication protocol adopts Modbus communications protocol format, comprises the following steps:
A. master controller generates instruction and the id information that can not repeat within a period of time and sends to from controller;
B. from controller response made to instruction and response content, comprise each id information of puing question to.
Particularly, master controller with carry out a communication data interactive command from controller and just can realize reading and writing discontinuous address field.
Particularly, described steps A comprises step by step following:
A1. master controller generates instruction and the id information that can not repeat within a period of time;
A2. master controller sends instruction and id information to from controller.
Particularly, master controller and adopt RS-232 serial ports or RS-422 serial ports or RS-485 serial ports or USB port from communication interface between controller.
Particularly, the protocol frame being somebody's turn to do the reliable communication method under unstable communication link environment is as follows:
Device address: with Modbus communication protocol synonym;
Function code: code 0x36 represents reading order, code 0x37 represents write order, all the other codes and Modbus communication protocol synonym;
Content frame length: represent byte length summation shared by the synchronous ID frame field of dialogue and content frame field;
Talk with synchronous ID: any number of master controller definition, returns identical value from controller this frame field returning response;
Content: interaction data deposits frame field, except when function code is 0x36,0x37, this frame field has Additional definitions, during all the other function codes, the definition of this frame field and Modbus communication protocol data frame field synonym.
In general, as shown in Figure 1, separate unit main frame can be connected with multiple electronic equipment by RS485 bus, and main frame and electric room adopt Modbus communication protocol, main frame and electronic equipment are master-slave equipment relations, and main frame any time and arbitrary equipment can carry out data interaction.
Fig. 2 is Modbus communication protocol frame format, as shown in Figure 2, i.e. the data orga-nizational format of master and slave communication between devices, wherein each frame field meanings is as follows:
Device address: from equipment code name, 0-255, uniquely represent 1 from equipment, when main frame sends inquiry order, this code name is specified in order, code name self code name and inquiry order is compared from equipment by all afterwards in RS485 bus, just can determine oneself whether respond and reply inquiry order.
Function code: definition main equipment requires the action carried out from equipment.
Data: when question and answer are mutual, the data content of the desired transmission of master and slave equipment room, function code is different, and data content is not identical yet.
Main frame and electric room, the most frequently used action is exactly transfer of data.With reference in figure 3, Modbus communication protocol, function code 03,04 may be used for electronic equipment to Host Transfer data, function code 06, and 16 may be used for main frame to electronic equipment data.
Fig. 4 describes the reciprocal process by 03 function code order between main frame and electronic equipment:
The feature of 03 function code order is, complete once mutual, main frame can only read the value of one section of continuation address from the holding register of electronic equipment; The feature of 04 function code order, similar with 03, complete once mutual, main frame can only read the value of one section of continuation address from the input register of electronic equipment.
Fig. 5 describes the reciprocal process by 16 function code orders between main frame and electronic equipment.
The feature of 16 function code orders is, complete once mutual, main frame can only write the value of one section of continuation address in the holding register of electronic equipment; The feature of 06 function code order, similar with 16, complete once mutual, main frame can only write the value of one section of continuation address in the holding register of electronic equipment.
To sum up, Modbus communication protocol is by address sequential organization main frame from low to high and from the communication data between equipment, no matter main frame reads from equipment, or write data, the value of one section of continuation address can only be operated all at most.
If certain subtask A of main frame reads or write certain value from the discontinuous address of equipment register multistage, main frame and just need repeatedly 03,04 or 06,16 function code command interactions between equipment.
In stable communication link (as main frame is connected by RS485 bus with from equipment), each 03,04 or 06, the time delay of 16 command interactions is few, and order is not easily lost, is made mistakes, main frame send all 03,04 or 06, the probability that 16 orders all receive response is just high, and main frame is with regard to the A that easily finishes the work.
In the communication link of instability (as main frame is connected by the Internet with from equipment), each 03,04 or 06,16 command interactions all may the time delay because of network congestion, and order is easily lost, main frame send all 03, the probability that 04 or 06,16 orders receive response all is on time just very low, any one time 03,04 or 06,16 order the failure that unsuccessfully all can cause host task A.
In addition, Modbus communication protocol adopts a kind of catechetical data interactive mode, its basic logic is, enquirement side relies on response time, and whether time-out judges whether reply party has response, and this logic existing defects, if transmission link exists transmission delay, and this delay time is indefinite, probably the 2nd time, even the 3rd enquirement can receive the response of the 1st time, causes response chaotic.
So, in the network environment of unstable link, Modbus communication protocol has not been suitable for main frame and various data communication between equipment, and be not certainly suitable for main frame yet and monitored from equipment various by the Internet, the real-time of monitoring does not reach requirement yet.
The invention provides a kind of reliable communication method under unstable communication link environment, when main frame be in the network environment of unstable communication link from equipment, also can ensure that communication is between the two smooth and easy, guarantee monitor real-time, stability, accuracy.For this reason, the method need solve following two problems:
1. in reciprocal process, to the problem that the discontinuous address field of discrete distribution is read and write;
2. solve under unstable network, because of the problem of mutual both sides' question and answer entanglement that Network Transmission Delays causes.
In fact, Modbus communication protocol is not suitable for the essential reason carrying out data interaction in unstable communication link, for single communication task, if Content of Communication is distributed in discontinuous address field, just need many data interactive commands to read and write these address fields respectively and just can complete communication task, only needs data interactive command just energy traffic carried task of ratio, not only call duration time adds, and because of wherein a certain bar interactive command failure and cause the probability of communication task failure also to increase.
In addition, Modbus communication protocol cause put question to response entanglement essential reason be, when enquirement side repeatedly put question to and only receive once reply time, this unique once response can not be told according to response content and belong to which time enquirement, if comprise the information of each ID putd question in response content, and this id information can not repeat within a period of time, even if so transmission link exists certain time-delay, enquirement side can match corresponding enquirement according to the id information of response content and get on.
Therefore, propose a kind of reliable communication method under unstable communication link environment, a data interaction order just can be read and write discontinuous address field, the protocol frame of this kind of method as shown in Figure 6:
Device address: with Modbus communication protocol synonym;
Function code: code 0x36 represents reading order, code 0x37 represents write order, all the other codes and Modbus communication protocol synonym;
Content frame length: represent byte length summation shared by the synchronous ID frame field of dialogue and content frame field;
Talk with synchronous ID: any number of master controller definition, returns identical value from controller this frame field returning response;
Content: interaction data deposits frame field, except when function code is 0x36,0x37, this frame field has Additional definitions, during all the other function codes, the definition of this frame field and Modbus communication protocol data frame field synonym.
Can disposable reading be the value of the discontinuous address field of initial address respectively with 1 ~ address, address n with reference to figure 7, the order of Fig. 8,0x36 function code.
Can one-time write be the value of the discontinuous address field of initial address respectively with 1 ~ address, address n with reference to figure 9, the order of Figure 10,0x37 function code.
To sum up, in the reliable communication method under unstable communication link environment, function code is 0x36, the order of 0x37 decreases main frame and the number of times from equipment room data interaction in the unit interval, under internet environment, compared with Modbus communication protocol, for the data interaction task of discontinuous address field, save call duration time, reduce communication failure probability.
In addition, in the reliable communication method under unstable communication link environment, we suppose that dialogue both sides are for Party A, Party B, Party A wants initiation one section dialogue, and when wishing that the other side replys, and needs the ID(that not easily repeats in a period of time of generation as serial number), put into the synchronous ID of dialogue, again protocol package A is mail to Party B, Party B need add the synchronous ID of dialogue of protocol package A in response protocol bag B, then replies to Party A; In like manner, Party B wants initiation one section dialogue, needs to experience identical process.This interaction flow, makes either party can put question to, reply by exact matching, effectively avoids dialogue chaotic.
Assuming that the value from the address field of 3 sections of noncontinuities of equipment is read in main frame timing.
With reference to Figure 11, Figure 12, contrast two kinds of means of communication and read process, can obviously find out, the reliable communication method under unstable communication link environment is by reducing data interaction number of times, not only shorten the time of single timing peek, and reduce the probability of failure of single timing peek.
The invention has the advantages that, the id information that the present invention adopts master controller to be created on can not to repeat in a period of time and and data send in the lump from controller, from controller response content, comprise the id information of each enquirement; Master controller with carry out a communication data interactive command from controller and just can read and write discontinuous address field.The invention solves the problem of the mutual both sides' question and answer entanglement caused because of Network Transmission Delays under unstable network, decrease the number of times to discrete distribution address data manipulation, improve efficiency and the reliability of data communication.
Above content is in conjunction with concrete preferred implementation further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, some simple deduction or replace can also be made, all should be considered as belonging to protection scope of the present invention.
Claims (5)
1. the reliable communication method under unstable communication link environment, master controller communicates with from controller, receives the instruction of master controller transmission from controller, and communication protocol adopts Modbus communications protocol format, it is characterized in that, comprises the following steps:
A. master controller generates instruction and the id information that can not repeat within a period of time and sends to from controller;
B. from controller response made to instruction and response content, comprise each id information of puing question to.
2. the reliable communication method under unstable communication link environment as claimed in claim 1, it is characterized in that, described steps A comprises step by step following:
A1. master controller generates instruction and the id information that can not repeat within a period of time;
A2. master controller sends instruction and id information to from controller.
3. reliable communication method under unstable communication link environment as claimed in claim 1, is characterized in that: master controller with carry out a communication data interactive command from controller and just can realize reading and writing discontinuous address field.
4. the reliable communication method under unstable communication link environment as described in any one of claims 1 to 3, is characterized in that: master controller and adopt RS-232 serial ports or RS-422 serial ports or RS-485 serial ports or USB port from communication interface between controller.
5. the reliable communication method under unstable communication link environment as claimed in claim 3, it is characterized in that, the protocol frame of the method is as follows:
Device address: with Modbus communication protocol synonym;
Function code: code 0x36 represents reading order, code 0x37 represents write order, all the other codes and Modbus communication protocol synonym;
Content frame length: represent byte length summation shared by the synchronous ID frame field of dialogue and content frame field;
Talk with synchronous ID: any number of master controller definition, returns identical value from controller this frame field returning response;
Content: interaction data deposits frame field, except when function code is 0x36,0x37, this frame field has Additional definitions, during all the other function codes, the definition of this frame field and Modbus communication protocol data frame field synonym.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106781403A (en) * | 2017-02-23 | 2017-05-31 | 湖南工业大学 | A kind of communication technology of the remote data transmission based on LORA and GPRS |
| CN111818060A (en) * | 2020-07-09 | 2020-10-23 | 厦门海为科技有限公司 | Communication protocol, method and system supporting hybrid and discrete data transmission |
| CN111884915A (en) * | 2020-07-17 | 2020-11-03 | 杭州电子科技大学 | Method for improving efficiency of acquiring modbus equipment by gateway |
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Effective date of registration: 20170608 Address after: The 523000 Guangdong tea in Dongcheng District city of Dongguan Province on Industrial Zone, Road No. 18 A District Applicant after: DONGGUAN TUANCHENG AUTOMATION EQUIPMENT CO., LTD. Address before: 523000 Dongcheng District, Guangdong Province, the new world garden, Wang Jing, Taiwan,, 1 10A Applicant before: Zeng Yongquan |
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Application publication date: 20151021 |