CN113824626B - Communication management method for preventing information interaction loss - Google Patents
Communication management method for preventing information interaction loss Download PDFInfo
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- CN113824626B CN113824626B CN202111122653.3A CN202111122653A CN113824626B CN 113824626 B CN113824626 B CN 113824626B CN 202111122653 A CN202111122653 A CN 202111122653A CN 113824626 B CN113824626 B CN 113824626B
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- 230000006854 communication Effects 0.000 title claims abstract description 44
- 238000004891 communication Methods 0.000 title claims abstract description 43
- 230000003993 interaction Effects 0.000 title claims abstract description 17
- 238000007726 management method Methods 0.000 title claims abstract description 11
- 238000012544 monitoring process Methods 0.000 claims abstract description 61
- 238000012795 verification Methods 0.000 claims abstract description 22
- 230000004044 response Effects 0.000 claims description 13
- 238000000605 extraction Methods 0.000 abstract description 11
- 230000005540 biological transmission Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 9
- 238000012790 confirmation Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000002159 abnormal effect Effects 0.000 description 4
- 230000004048 modification Effects 0.000 description 3
- 238000013075 data extraction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L51/00—User-to-user messaging in packet-switching networks, transmitted according to store-and-forward or real-time protocols, e.g. e-mail
- H04L51/21—Monitoring or handling of messages
- H04L51/224—Monitoring or handling of messages providing notification on incoming messages, e.g. pushed notifications of received messages
Abstract
The invention discloses a communication management method for preventing information interaction from losing, which comprises the following steps: the monitoring host issues a data command for reading the first register set; the terminal equipment responds to the record report data of the first register group; the monitoring host receives the record report data of the first register group, performs verification, and if the verification is correct, enters the next step; the monitoring host issues a data command for reading the second register set; the terminal equipment responds to the record report data of the second register group; the monitoring host receives the record report data of the second register set, performs verification, and returns to the step of reading the first register set if the verification is correct; the application aims to provide a communication management method for preventing information interaction from losing, which can finish the extraction of required record report data by at least one round of communication interaction operation, and when communication is in error, communication interaction is performed for a plurality of times to ensure that messages are not lost, so that the reliability of data transmission is ensured, and the communication efficiency is also considered.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a communication management method for preventing information interaction from being lost.
Background
In industrial control and various automatic control systems, in order to realize the on-line monitoring and control of a monitoring host to the whole automatic control system, the monitoring system host needs to adopt a consistent communication protocol to realize the interconnection and intercommunication of various intelligent terminal devices through a communication network; in order to ensure the replaceability of various intelligent terminal devices of the data source and improve the convenience of project implementation and later maintainability of the whole automation system, a mature, stable and standard international communication protocol is generally selected to acquire the required data information.
The existing monitoring host computer and the register group are communicated, one is that the monitoring host computer firstly transmits a command for reading the record report register group, if the terminal equipment responds and passes the verification of the correct response message, the monitoring host computer transmits a confirmation command again, after receiving the confirmation command, the terminal equipment clears the previous record report and prepares to respond to the command data of the record report register for next reading; if there is no response or reply message parsing error, the monitoring host will not issue a confirmation command, and the record report will not be cleared until the reading is successful.
And the other is that all record reports in the terminal equipment are uniformly coded, the monitoring host firstly reads the index number range of the record report stored in the current terminal equipment, firstly issues record numbers for preparing and extracting the record report according to the requirement, and then reads the required record report, if the index is not changed, the record report stored in the register is not changed, and the record report is ensured not to be lost.
The above communication methods all have the following disadvantages: and if an error occurs in a certain link in the interactive operation process, repeated extraction is needed, and the efficiency is low.
Disclosure of Invention
The invention aims to provide a communication management method for preventing information interaction from being lost, which can finish the extraction of the required record report data by at least one round of communication interaction operation, and when communication is in error, the communication interaction is carried out for a plurality of times to ensure that messages are not lost, thereby ensuring the reliability of data transmission and also considering the communication efficiency.
To achieve the purpose, the invention adopts the following technical scheme: a communication management method for preventing information interaction loss comprises the following steps:
the terminal equipment defines a starting address of a first register group and a starting address of a second register group for recording report data;
the monitoring host issues a data command for reading the first register set;
the terminal equipment responds to the record report data of the first register group;
the monitoring host receives the record report data of the first register group, performs verification, and if the verification is correct, enters the next step;
the monitoring host issues a data command for reading the second register set;
the terminal equipment responds to the record report data of the second register group;
the monitoring host receives the record report data of the second register group, performs verification, and if the verification is correct, enters the next step;
and returning to the step of issuing a data command for reading the first register group by the monitoring host.
Preferably, the monitoring host receives the record report data of the first register set and verifies, if the record report data of the first register set is wrong, the monitoring host circularly issues a data command for reading the first register set until the monitoring host receives the record report data of the first register set and verifies that the record report data of the first register set is correct.
Preferably, the monitoring host receives the record report data of the second register set and verifies, if the record report data of the second register set is wrong, the monitoring host circularly issues a data command for reading the second register set until the monitoring host receives the record report data of the second register set and verifies that the record report data of the second register set is correct.
Preferably, in the step of defining the start address of the first register set and the start address of the second register set for recording the report data by the terminal device, the terminal device defines the start address of the first register set and the start address of the second register set by using Modbus protocol.
Preferably, in the step of issuing the data command for reading the first register set by the monitoring host, a first byte of the data command represents an address of the terminal device to be read, a second byte represents a read command code, a third byte and a fourth byte represent addresses of the first register set, a fifth byte and a sixth byte represent numbers of registers, and a seventh byte and an eighth byte represent message CRC check codes of the issued command.
Preferably, in the step of the terminal device responding to the record report data of the first register set, a first byte of the record report data represents an address of the answering terminal device, a second byte represents a read command code, a third byte represents a number of answering bytes, a byte between a fourth byte and a third last byte represents the record report data of the first register set, and a second last byte and a first last byte represent message CRC check codes of the answer report data.
Preferably, the monitoring host receives the record report data of the first register set, and in the step of verifying, compares whether the address of the response device is the same as the address of the issuing command device, compares whether the read command code is the same, compares whether the byte length of the record report data of the first register set is twice the number of registers, and verifies the message CRC check code of the response report data.
Preferably, the record report data of the first register is record report information of occurrence of the first event, and a record format thereof is: number, type, year, month, day, time, minute, second, millisecond.
Preferably, the record report data of the second register is record report information of occurrence of the second event, and a record format thereof is: number, type, year, month, day, time, minute, second, millisecond.
The technical scheme of the invention has the beneficial effects that: when the network communication is normal, only one round of inquiry and response processes can be used for completing the extraction of the recorded data of the message, so that the communication time is shortened, the information extraction efficiency is improved, and the communication effect is ensured; the record report data is read last time, and after the record report data is verified to be correct, the record report data is read next time, so that the monitoring host can read record report data information in the target equipment without loss, error and repetition; the method changes the extraction of the recorded report data based on the existing communication protocol, realizes a confirmation retransmission mechanism of communication, improves the efficiency of software modification and reduces the realization cost.
Drawings
FIG. 1 is a workflow diagram of one embodiment of the present invention;
FIG. 2 is a flow chart of the communication between a monitor host and a register set according to the prior art;
FIG. 3 is a flow chart of the communication between a monitor host and a register set according to another prior art.
Detailed Description
The technical scheme of the invention is further described below by the specific embodiments with reference to the accompanying drawings.
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
Referring to fig. 1 to 3, a communication management method for preventing information interaction loss includes the following steps:
the terminal equipment defines a starting address of a first register group and a starting address of a second register group for recording report data;
the monitoring host issues a data command for reading the first register set;
the terminal equipment responds to the record report data of the first register group;
the monitoring host receives the record report data of the first register group, performs verification, and if the verification is correct, enters the next step;
the monitoring host issues a data command for reading the second register set;
the terminal equipment responds to the record report data of the second register group;
the monitoring host receives the record report data of the second register group, performs verification, and if the verification is correct, enters the next step;
and returning to the step of issuing a data command for reading the first register group by the monitoring host.
By adopting the mode, when the network communication is normal, the extraction of the message record data can be completed once only through one round of inquiry and response processes, so that the communication time is shortened, the information extraction efficiency is improved, and the communication effect is ensured; the record report data is read last time, and after the record report data is verified to be correct, the record report data is read next time, so that the monitoring host can read record report data information in the target equipment without loss, error and repetition; the method changes the extraction of the recorded report data based on the existing communication protocol, realizes a confirmation retransmission mechanism of communication, improves the efficiency of software modification and reduces the realization cost.
In the application, the monitoring host receives the record report data of the first register set and performs verification, if the verification is wrong, the monitoring host circularly issues a data command for reading the first register set until the monitoring host receives the record report data of the first register set and verifies that the record report data is correct.
And by verifying the record report data of the first register group, the data command of the first register group is circularly read until the correct record report data is obtained, so that the accuracy of the record report data is ensured, and network errors are avoided, and errors such as loss, errors or repetition and the like of the record report data are avoided. When network communication is abnormal, the communication automatically shifts to a retransmission process, so that no lost interaction of the message record data is ensured until the message record data is successfully extracted, and the next round of data extraction is automatically performed.
Specifically, the monitoring host receives the record report data of the second register set and verifies, if the record report data of the second register set is wrong, the monitoring host circularly issues a data command for reading the second register set until the monitoring host receives the record report data of the second register set and verifies that the record report data of the second register set is correct.
And by verifying the record report data of the second register set, the data command of the second register set is circularly read until the correct record report data is obtained, so that the accuracy of the record report data is ensured, and network errors are avoided, and errors such as loss, errors or repetition of the record report data are avoided. When network communication is abnormal, the communication automatically shifts to a retransmission process, so that no lost interaction of the message record data is ensured until the message record data is successfully extracted, and the next round of data extraction is automatically performed.
Preferably, in the step of defining the start address of the first register set and the start address of the second register set for recording the report data by the terminal device, the terminal device defines the start address of the first register set and the start address of the second register set by using Modbus protocol.
The Modbus protocol is adopted to have public release and no copyright requirements; the deployment and maintenance are easy; the advantages of little bit or byte restrictions on the modification mobile local to the vendor.
In the method, in the step of issuing the data command of reading the first register set by the monitoring host, a first byte of the data command represents an address of a terminal device to be read, a second byte represents a read command code, a third byte and a fourth byte represent addresses of the first register set, a fifth byte and a sixth byte represent numbers of registers, and a seventh byte and an eighth byte represent message CRC check codes of the issued command.
Specifically, in the step of the terminal device responding to the record report data of the first register set, the first byte of the record report data represents the address of the answering terminal device, the second byte represents the read command code, the third byte represents the number of answering bytes, the bytes between the fourth byte and the third last byte represent the record report data of the first register set, and the second last byte and the first last byte represent the message CRC check code of the answer report data.
Meanwhile, the monitoring host receives the record report data of the first register group, and in the step of verifying, the address of the response equipment is compared with the address of the issuing command equipment, whether the read command code is the same is compared, whether the byte length of the record report data of the first register group is twice the number of registers is compared, and the message CRC check code of the response report data is checked.
According to the format requirement of Modbus protocol, the format of data command and record report data is defined, so that the communication between the monitoring host and the terminal equipment is convenient, after the monitoring host sends a command for reading the record report register, the terminal equipment responds to the record report data, after the transmission is completed, the terminal equipment clears the record report which is already sent and fills in new record report data, and the monitoring host is ensured to reliably acquire the record report but can not repeatedly acquire the same report.
Preferably, the record report data of the first register is record report information of occurrence of the first event, and a record format thereof is: number, type, year, month, day, time, minute, second, millisecond.
Preferably, the record report data of the second register is record report information of occurrence of the second event, and a record format thereof is: number, type, year, month, day, time, minute, second, millisecond.
One embodiment of the present application:
definition: two pieces of event record report information exist in the terminal equipment, the record formats (number, type, year, month, day, time, minute, second, millisecond) are as follows, and the storage formats in the register are as follows:
a first strip: 01 55 21 07 29 15 32 11 02 21; information 1 occurs indicating that content 21 years, 07 months, 29 days, 15 hours, 32 minutes, 11 seconds, 221 milliseconds.
And a second strip: 01AA 21 07 29 15 30 11 01 11; the content indicated 21 year, 07 month, 29 day, 15 hour, 30 minutes, 11 seconds, 111 milliseconds, and the information 1 disappeared.
Modbus-RTU register address 0x2100 is defined as the event record report information read first register set start address and Modbus-RTU register address 0x2200 is defined as the event record report information read second register set start address.
Normal communication flow:
the monitoring host sends a read event command: 01 03 2100 00 05 8F F5;
and the terminal equipment responds: 01 03 0A 01 55 21 07 29 15 32 11 02 21 96CB;
the monitoring host receives correctly and reads the next event command: 01 03 2200 00 05 8F B1;
and the terminal equipment responds: 01 03 0A 01AA 21 07 29 15 30 11 01 11D2 63;
and finishing the whole event extraction process.
Abnormal communication flow:
the monitoring host sends a read event command: 01 03 2100 00 05 8F F5;
and the terminal equipment responds: 01 03 0A 01 55 21 07 29 15 32 11 02 21 96CB, when the communication process is abnormal, the monitoring host receives 01 03 0A 01 55 21 07 29 15 32 11 02 21 96CA, and the monitoring host verifies the check code error;
the monitoring host repeatedly sends the read event command again: 01 03 2100 00 05 8F F5;
and the terminal equipment responds: 01 03 0A 01 55 21 07 29 15 32 11 02 21 96CB;
the monitoring host receives correctly and reads the next event command: 01 03 2200 00 05 8F B1;
and the terminal equipment responds: 01 03 0A 01AA 21 07 29 15 30 11 01 11D2 63;
and finishing the whole event extraction process.
In the description herein, reference to the term "embodiment," "example," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The technical principle of the present invention is described above in connection with the specific embodiments. The description is made for the purpose of illustrating the general principles of the invention and should not be taken in any way as limiting the scope of the invention. Other embodiments of the invention will be apparent to those skilled in the art from consideration of this specification without undue burden.
Claims (3)
1. A communication management method for preventing information interaction loss is characterized by comprising the following steps:
the terminal equipment defines a starting address of a first register group and a starting address of a second register group for recording report data;
the terminal equipment adopts Modbus protocol to define the starting address of the first register group and the starting address of the second register group;
the monitoring host issues a data command for reading the first register set;
the terminal equipment responds to the record report data of the first register group;
the monitoring host receives the record report data of the first register group, performs verification, and if the verification is correct, enters the next step;
if the verification is wrong, the monitoring host circularly issues a data command for reading the first register set until the monitoring host receives the record report data of the first register set and verifies the record report data to be correct;
the monitoring host issues a data command for reading the second register set;
the terminal equipment responds to the record report data of the second register group;
the monitoring host receives the record report data of the second register group, performs verification, and if the verification is correct, enters the next step;
if the verification is wrong, the monitoring host circularly issues a data command for reading the second register set until the monitoring host receives the record report data of the second register set and verifies the record report data to be correct;
returning to the step of issuing a data command for reading the first register group by the monitoring host;
in the step of issuing a data command for reading a first register group by the monitoring host, a first byte of the data command represents an address of a terminal device to be read, a second byte represents a read command code, a third byte and a fourth byte represent addresses of the first register group, a fifth byte and a sixth byte represent numbers of registers, and a seventh byte and an eighth byte represent message CRC check codes for issuing the command;
in the step of responding the record report data of the first register group by the terminal equipment, the first byte of the record report data represents the address of the response terminal equipment, the second byte represents the read command code, the third byte represents the number of response bytes, the bytes from the fourth byte to the third last byte represent the record report data of the first register group, and the second last byte and the first last byte represent the message CRC check code of the response report data;
and the monitoring host receives the record report data of the first register group, and in the step of verification, compares whether the address of the response equipment is the same as the address of the issuing command equipment, compares whether the read command codes are the same, compares whether the byte length of the record report data of the first register group is twice the number of the registers, and checks the message CRC check code of the response report data.
2. The communication management method for preventing information interaction loss according to claim 1, wherein the record report data of the first register is record report information of occurrence of a first event, and the record format is: number, type, year, month, day, time, minute, second, millisecond.
3. The communication management method for preventing information interaction loss according to claim 1, wherein the record report data of the second register is record report information of occurrence of a second event, and the record format is: number, type, year, month, day, time, minute, second, millisecond.
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