CN108011693B - General data coding method based on ARINC429 bus communication - Google Patents
General data coding method based on ARINC429 bus communication Download PDFInfo
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- CN108011693B CN108011693B CN201711094187.6A CN201711094187A CN108011693B CN 108011693 B CN108011693 B CN 108011693B CN 201711094187 A CN201711094187 A CN 201711094187A CN 108011693 B CN108011693 B CN 108011693B
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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
- H04L1/0006—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format
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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
- H04L1/0006—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format
- H04L1/0007—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format by modifying the frame length
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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
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0061—Error detection codes
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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
- H04L1/24—Testing correct operation
- H04L1/245—Testing correct operation by using the properties of transmission codes
- H04L1/246—Testing correct operation by using the properties of transmission codes two-level transmission codes, e.g. binary
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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
- H04L2001/0092—Error control systems characterised by the topology of the transmission link
- H04L2001/0094—Bus
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Abstract
The invention relates to a universal data coding method based on ARINC429 bus communication, which comprises the steps of establishing a communication structural body of each physical quantity, calculating the total number of the physical quantities to be analyzed, inputting the physical quantity to be transmitted, searching the length and the scale of effective data, converting the physical quantity into binary numbers in BCD data word format, checking parity and outputting character type original codes. The code combining method has the characteristics of flexibility, universality, good expansibility and high reliability.
Description
Technical Field
The invention belongs to the field of communication, relates to a data group code method, and mainly aims to provide a data group code based on ARINC429 bus communication.
Background
ARINC429 bus communication is in units of 4 bytes. The valid bits of the character transmission are 32 bits, where: the lower 8 bits are the information identifier, bit 32 is the parity bit for error detection and correction, bits 9, 10 are the destination/source receiver id, bits 11-29 are the data bits to be transmitted, and bits 30, 31 are the symbol/state matrix.
The types of data transmitted by ARINC429 include BNR data, BCD data, and discrete data. The BNR data and the discrete data are represented by binary data and can be directly transmitted. When the type of data transmitted by ARINC429 is BCD data, i.e., decimal number represented by binary, the data area is divided from lower to upper bits in units of four bits to obtain five subfields. The BCD data word format is as follows.
TABLE 1 BCD data word Format
In the process of sending BCD data, floating point type data to be sent needs to be converted into corresponding binary number for transmission according to a digital interface communication protocol, that is, the sent physical quantity is converted into corresponding character type source codes.
Because the information identifier, the effective data length and the scale of the transmitted data are different, independent code grouping is required according to the characteristics of each data. If the method is implemented by a direct shift method, the procedure is tedious, not easy to change, and is easy to make mistakes in implementation.
Disclosure of Invention
The purpose of the invention is: a universal data coding method for ARINC429 bus communication is provided, so that the coding is more flexible and universal, the development time and cost are saved, and the implementation process is simple, convenient, easy to implement and reliable.
In view of the above problems of the prior art, according to one aspect of the present disclosure, the following technical solutions are adopted in the present invention:
a universal data coding method based on ARINC429 bus communication comprises the following steps:
1) the information identifier, the effective data length and the information of the scale are represented by a structural body;
2) establishing a communication structure body of each physical quantity according to each physical quantity information to be sent;
3) calculating the total number of the physical quantities to be analyzed according to the established communication structure;
4) inputting a physical quantity to be sent and a corresponding identifier thereof;
5) comparing the input information identifier with the information identifier in the communication structure, circularly searching the effective data length and the scale corresponding to the information identifier, stopping searching if the corresponding effective data length and the scale are found before all circulation is finished, and unsuccessfully assembling codes if the corresponding effective data length and the scale are not found all the time;
6) converting the input physical quantity into a decimal integer number according to the scale searched in the step 5);
7) converting the decimal integer number into a binary number meeting the BCD data word format according to the effective data length searched in the step 5);
8) judging the sign of the physical quantity, and setting the sign/state matrix position according to the sign;
9) splicing the calculated binary codes according to a BCD data word format, and setting a parity check bit according to a parity check mode specified by a communication protocol;
10) and outputting the character type original code for transmission.
The method is characterized in that the total number of the physical quantities to be analyzed is calculated by dividing the total length of the bytes of the established communication structure by the length of the bytes of the structure of a single physical quantity.
The method is characterized in that the cycle number in the step 5) is the maximum of the total number of the physical quantities.
The method is characterized in that the calculated binary codes are spliced according to a BCD data word format, specifically, the binary numbers obtained in the step 7), the symbol/state matrix bits obtained in the step 8) and the information identifier are spliced according to the BCD data word format.
Has the advantages that:
when ARINC429 bus data is sent, the code combining method of the invention can be used for directly converting the physical quantity to be sent into transmissible BCD data according to the requirements of a digital communication protocol.
Drawings
FIG. 1 is a flow chart of the method of the present invention.
Detailed Description
The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto.
Referring to fig. 1, the universal data group code method based on ARINC429 bus communication of the present invention includes the following steps:
1) the information identifier, the effective data length and the information of the scale are represented by a structural body;
2) establishing a communication structure body of each physical quantity according to each physical quantity information to be sent;
3) calculating the total number of the physical quantities to be analyzed by dividing the total length of the bytes of the established communication structure by the length of the bytes of the structure of a single physical quantity;
4) inputting a physical quantity to be sent and a corresponding identifier thereof;
5) comparing the input information identifier with the information identifier in the communication structure, circularly searching the effective data length and the scale corresponding to the information identifier, wherein the number of the circulation is the maximum number of the total physical quantities, if the corresponding effective data length and the scale are found before all circulation is completed, stopping searching, and if the corresponding effective data length and the scale are not found, the code combination is not successful;
6) converting the input physical quantity into a decimal integer number according to the scale searched in the step 5);
7) converting the decimal integer number into a binary number meeting the BCD data word format according to the effective data length searched in the step 5);
8) judging the sign of the physical quantity, and setting the sign/state matrix position according to the sign;
9) splicing the binary number obtained in the step 7), the symbol/state matrix bit and the information identifier obtained in the step 8) according to a BCD data word format, and setting a parity check bit according to a parity check mode specified by a communication protocol;
10) and outputting the character type original code for transmission.
The invention has been successfully applied to data coding in a plurality of ARINC429 bus communication processes, and has achieved expected effects and effective verification. The ARINC429 bus communication-based universal data coding method is reasonable and reliable, and has a very wide application prospect.
Claims (4)
1. A universal data coding method based on ARINC429 bus communication comprises the following steps:
1) the information identifier, the effective data length and the information of the scale are represented by a structural body;
2) establishing a communication structure body of each physical quantity according to each physical quantity information to be sent;
3) calculating the total number of the physical quantities to be analyzed according to the established communication structure;
4) inputting a physical quantity to be sent and a corresponding identifier thereof;
5) comparing the input information identifier with the information identifier in the communication structure, circularly searching the effective data length and the scale corresponding to the information identifier, stopping searching if the corresponding effective data length and the scale are found before all circulation is finished, and unsuccessfully assembling codes if the corresponding effective data length and the scale are not found all the time;
6) converting the input physical quantity into a decimal integer number according to the scale searched in the step 5);
7) converting the decimal integer number into a binary number meeting the BCD data word format according to the effective data length searched in the step 5);
8) judging the sign of the physical quantity, and setting the sign/state matrix position according to the sign;
9) splicing the binary number obtained in the step 7), the symbol/state matrix bit and the information identifier obtained in the step 8) according to a BCD data word format, and setting a parity check bit according to a parity check mode specified by a communication protocol;
10) and outputting the character type original code for transmission.
2. The method as claimed in claim 1, wherein the total number of the physical quantities to be analyzed is calculated according to the total byte length of the established communication structure divided by the byte length of the structure of a single physical quantity.
3. The method as claimed in claim 1, wherein the number of loops in step 5) is at most the total number of physical quantities.
4. The method as claimed in claim 1, wherein the calculated binary codes are concatenated according to BCD data word format, specifically, the binary numbers obtained in step 7), the symbol/state matrix bits and the information identifier obtained in step 8) are concatenated according to BCD data word format.
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