CN116582520A - Address information distribution system based on RS485 protocol - Google Patents
Address information distribution system based on RS485 protocol Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L61/00—Network arrangements, protocols or services for addressing or naming
- H04L61/50—Address allocation
- H04L61/5038—Address allocation for local use, e.g. in LAN or USB networks, or in a controller area network [CAN]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/18—Protocol analysers
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Abstract
The invention provides an address information distribution system based on an RS485 protocol, which comprises: the target server ID list, the processor and the memory storing the computer program, when the computer program is executed by the processor, the following steps are implemented: according to the target server ID list, an address line ID list corresponding to the target server ID list is obtained; acquiring an address line control byte; and acquiring a target address information list corresponding to the target server ID list according to the address line ID list and the address line control byte. According to the invention, the address line is added on the basis of the original RS485 bus communication, so that the same time period is ensured, only one target server is in the state of receiving the address, when a certain server is offline due to the conditions of hot plug and the like, the address line of the previous server of the server is controlled by the gateway, the address is reassigned for the current server, and the uniqueness and continuity of the address can be ensured.
Description
Technical Field
The invention relates to the technical field of communication, in particular to an address information distribution system based on an RS485 protocol.
Background
The existing address allocation method based on RS485 bus communication is mostly as follows: the control gateway sends out instructions, addresses are sequentially allocated to the servers according to the order of the servers which are in communication connection with the gateway through an RS485 bus and an RS485 protocol, when the communication environment is unstable, the hot plug is realized when the network is disconnected or the gateway supports the hot plug, namely the hot plug is realized when the power supply of the system is not closed, the module and the board card are inserted into or pulled out of the system without affecting the normal operation of the system, the control gateway sends out instructions again, and the addresses are sequentially allocated to the servers according to the order of the servers which are in communication connection with the gateway through the RS485 bus and the RS485 protocol.
However, the above method also has the following technical problems:
when the communication environment is unstable and the network is disconnected or the gateway supports hot plug, the gateway is controlled again to send out instructions, and addresses are sequentially allocated to the servers according to the sequence of the servers in communication connection with the gateway through an RS485 bus and an RS485 protocol, so that the situation of address allocation errors or address allocation conflicts can be possibly caused, and the uniqueness and continuity of the addresses cannot be guaranteed.
Disclosure of Invention
Aiming at the technical problems, the invention adopts the following technical scheme:
an RS485 protocol based address information distribution system, comprising: target server ID list a= { a 1 ，A 2 ，……，A i ，……，A m A processor and a memory storing a computer program, wherein A i For the i-th target server ID, i=1, 2 … … m, m is the number of target server IDs, when the computer program is executed by the processor, the following steps are implemented:
s100, according to A, obtaining an address line ID list B= { B corresponding to A 1 ，B 2 ，……，B i ，……，B m-1 }，B i Is A i Address line ID corresponding to the corresponding target server.
S200, acquiring an address line control byte C, wherein the address line control byte is one byte in an RS485 protocol.
S300, according to B and C, obtaining a target address information list D= { D corresponding to A 1 ，D 2 ，……，D i ，……，D m }，D i Is A i Corresponding destinationThe address information includes the following steps in S300 to obtain D i ：
S301, setting a state of a level of an address line corresponding to a target gateway to be in a first level state, wherein the first level state is a state when the level is in a low level state, and the system further comprises a preset first count value a=1, and the first count value is used for counting the times that the target gateway receives first instruction response information.
S302, controlling the target gateway to send out a first instruction to acquire D i A first instruction is used for A i The corresponding target server allocates address information, wherein i=a, if D has been acquired i And returning the first instruction response information to the target gateway.
S303, if the target gateway acquires the first instruction response information, executing a step S304; otherwise, step S302 is performed.
S304, if a=1, executing step S305; otherwise, step S306 is performed.
S305, setting the state of the level of the address line corresponding to the target gateway to be in a second level state, wherein the second level state is a state when the level is in a high level, and executing S307.
S306, the control target gateway sends out a third instruction, wherein the third instruction is used for setting C as a second identifier so that B (i-1) The state of the level of the corresponding address line is in a second level state, where i=a.
S307, the control target gateway sends out a second instruction; a second instruction for setting C as the first identification to enable the target gateway to control B i The state of the level of the corresponding address line is in the first level state, and step S309 is performed, where i=a.
S308, the control target gateway sends out a fourth instruction, wherein the fourth instruction is used for setting C as a first identifier so that A is the first identifier (i-1) Corresponding target server control B i The state of the level of the corresponding address line is in the first level state, and step S309 is performed, where i=a.
S309, let a=a+1, and execute step S200.
The invention has at least the following beneficial effects:
the invention provides an address information distribution system based on an RS485 protocol, which comprises: the target server ID list, the processor and the memory storing the computer program, when the computer program is executed by the processor, the following steps are implemented: according to the target server ID list, an address line ID list corresponding to the target server ID list is obtained; acquiring an address line control byte; and acquiring a target address information list corresponding to the target server ID list according to the address line ID list and the address line control byte. It can be seen that the present invention adds the address line based on the original RS485 bus communication, and the gateway sends the instruction to determine whether to perform the address allocation operation to the target servers through the address control line, so that it can ensure that only one target server is in the state of receiving the address in the same time period, when the condition such as hot plug occurs to cause the off-line of a certain server, the gateway controls the address line of the previous server of the server to reallocate the address to the current server, so that the condition of address allocation error or address allocation conflict does not exist, and the uniqueness and continuity of the address can be ensured.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of an address information distribution system executing a computer program based on an RS485 protocol according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
The embodiment of the invention provides an address information distribution system based on an RS485 protocol, which comprises the following components: target server ID list a= { a 1 ，A 2 ，……，A i ，……，A m A processor and a memory storing a computer program, wherein A i For the i-th target server ID, i=1, 2 … … m, m is the number of target server IDs, when the computer program is executed by the processor, the following steps are implemented, as shown in fig. 1:
s100, according to A, obtaining an address line ID list B= { B corresponding to A 1 ，B 2 ，……，B i ，……，B m-1 }，B i Is A i The corresponding address line ID of the target server, where any method for obtaining the address line ID corresponding to the target server in the prior art is known to those skilled in the art, and is not described herein.
Specifically, the target server ID is a unique identity of the target server.
Specifically, the address line ID is a unique identity of the address line.
Further, the address lines are used to transmit address information.
Specifically, the address information is a character string composed of numerals or letters, for example: 0xFF.
Specifically, the target gateway corresponds to one address line.
Further, the target gateway is in communication connection with the first target server through an address line corresponding to the target gateway.
Further, A i Corresponding target server and A i+1 The corresponding target server passes B i The corresponding address lines are communicatively connected.
Specifically, all target servers correspond to the same target gateway.
Further, the target gateway and the target server are also in communication connection through an RS485 bus and an RS485 protocol.
S200, obtaining an address line control byte C, wherein the address line control byte is one byte in an RS485 protocol, and a person skilled in the art knows that the person skilled in the art sets the byte position of the address line control byte in the RS485 protocol according to actual requirements.
S300, according to B and C, obtaining a target address information list D= { D corresponding to A 1 ，D 2 ，……，D i ，……，D m }，D i Is A i Corresponding destination address information.
Specifically, the step S300 includes the steps of obtaining D i ：
S301, setting the state of the level of the address line corresponding to the target gateway to be in a first level state, wherein the first level state is a state when the level is in a low level state, and one skilled in the art knows that any method for setting the level state of the address line in the prior art belongs to the protection scope of the present invention, and is not repeated herein.
Specifically, the system further includes a preset first count value a=1, where the first count value is used to count the number of times that the target gateway receives the first instruction response information.
S302, controlling the target gateway to send out a first instruction to acquire D i The first instruction is used for giving A i The corresponding target server allocates address information, wherein i=a, if D has been acquired i And returning first instruction response information to the target gateway.
Specifically, the initial state of the level of the address line corresponding to the first address line ID is in the first level state.
Specifically, the step S302 includes the steps of obtaining first instruction response information:
s3021, acquisition A i Corresponding first address information E i The first address information is set by a person skilled in the art according to actual requirements, and is not described herein.
S3022, when B i When the state of the level of the corresponding address line is in the first level state, step S3023 is executed, otherwise step S3021 is executed.
S3023, obtain E i Similarity F of address information with preset address information i The similarity of the address information is the similarity between two address information, wherein, the person skilled in the art knows that the preset address information is the address information set by the person skilled in the art according to the actual requirement, and any method for obtaining the similarity between two address information in the prior art belongs to the protection scope of the present invention, and is not described herein, for example: cosine similarity algorithm.
S3024, when F i When=1, the RS485 protocol is parsed to obtain a i Corresponding second address information G i And returning first response information to the target gateway, wherein the first response information is characterized in that address setting is completed.
S3025, when A i And after the corresponding server returns the first response information to the target gateway, waiting for the target gateway to send out a key instruction.
S3026, when A i And when the corresponding target server receives the key instruction, executing S3027.
S3027, if the current C is the identifier "1", obtaining the first instruction response information.
Specifically, the step S3027 includes the steps of:
s1, when i=1, the control target gateway sends out a second instruction, wherein the second instruction is used for setting C as a first identifier so that the target gateway controls B i The state of the level of the corresponding address line is in the first level state.
S3, when i is not equal to 1, the control target gateway sends out a fourth instruction, wherein the fourth instruction is used for setting C as a first identifier so that the C passes through A (i-1) Corresponding target server control B i The state of the level of the corresponding address line is in the first level state.
S5, when B i When the state of the level of the corresponding address line is in the first level state, G is as follows i As D i And generates first instruction response information.
S3028, if the current C is not the identification "1", obtaining the first instruction response information.
Specifically, the step S3028 includes the steps of:
s1000, when i=1, controlling the target gateway to issue a first intermediate instruction, where the first intermediate instruction is used to set C to a second identifier, so that B is controlled by the target gateway i The state of the level of the corresponding address line is in a second level state, which is a state when the level is at a high level.
S3000, when i is not equal to 1, the control target gateway sends out a second intermediate instruction, wherein the second intermediate instruction is used for setting C as a second identifier, so that the second identifier passes through A (i-1) Corresponding target server control B i The state of the level of the corresponding address line is in the second level state.
S5000, when B i When the state of the level of the corresponding address line is in the second level state, G is selected i As D i And generates first instruction response information.
S3029, when A i And when the corresponding target server does not receive the key instruction, acquiring first instruction response information.
Specifically, the step S3029 includes the steps of:
s10, acquiring the current time point and A i The corresponding time interval T between the time points when the server returns the first response information to the target gateway, where those skilled in the art know that any method in the prior art capable of obtaining the time interval between two time points belongs to the protection scope of the present invention, and is not described herein.
S30, when T is more than T 0 At this time, step S3021, T is performed 0 The first interval duration is preset.
Specifically T 0 =10 milliseconds.
S50, when T is less than or equal to T 0 When this is the case, step S3026 is performed.
S303, if the target gateway acquires the first instruction response information, executing a step S304; otherwise, step S302 is performed.
S304, if a=1, executing step S305; otherwise, step S306 is performed.
S305, setting the state of the level of the address line corresponding to the target gateway to be in a second level state, and executing S307.
S306, the control target gateway sends out a third instruction, wherein the third instruction is used for setting C as a second identifier so that B (i-1) The state of the level of the corresponding address line is in a second level state, where i=a.
Specifically, the second identifier is an identifier "0" or an identifier "1", where those skilled in the art know that those skilled in the art set the second identifier according to actual needs.
Specifically, the step S306 includes the steps of:
s3061, when a=2, controlling B by the target gateway (i-1) The state of the level of the corresponding address line is in the second level state, and step S308 is performed, where i=a.
S3063, when a > 2, by A (i-2) Corresponding target server control B (i-1) The state of the level of the corresponding address line is in the second level state, and step S308 is performed, where i=a.
S307, the control target gateway sends out a second instruction; the second instruction is used for setting C as a first identifier so that the target gateway controls B i The state of the level of the corresponding address line is in the first level state, and step S309 is performed, where i=a.
Specifically, the first identifier is an identifier "0" or an identifier "1".
Further, the first identifier is different from the second identifier, that is, if the first identifier is "0", the second identifier is "1", and if the first identifier is "1", the second identifier is "0".
S308, the control target gateway sends out a fourth instruction, wherein the fourth instruction is used for setting C as a first identifier so that A is the first identifier (i-1) Corresponding target server control B i The state of the level of the corresponding address line is in the first level state, and step S309 is performed, where i=a.
S309, let a=a+1, and execute step S200.
Above-mentioned, increased the address line on original RS485 bus communication basis, sent the instruction by the gateway, confirm whether carry out the address allocation operation to the target server through the address control line, can guarantee same time quantum, only a target server is in the state of receiving the address, can guarantee the uniqueness and the continuity of address.
Specifically, the present invention also provides an embodiment, when the target server is inserted into the system or removed from the system without turning off the power of the system, the method further includes the following steps after step S300:
s400, acquiring a final server ID list H= { H 1 ，H 2 ，……，H j ，……，H n }，H j For the j-th final server ID, j=1, 2 … … n, n is the number of final server IDs, and the final server ID is the unique identity of the final server, where the final server is the server existing in the current system.
S500, acquiring a third address information list R= { R corresponding to H 1 ，R 2 ，……，R j ，……，R n }，R j Is H j And the corresponding third address information is the address information of the current target server.
S600, obtaining R j Similarity L of address information with preset address information j The method for obtaining the address similarity between the third address information and the preset address information is the same as the method for obtaining the address similarity between the first address information and the preset address information, which is not described herein.
S700, when L j When not equal to 1, acquire H j Corresponding final address information.
Specifically, the step S700 includes the steps of:
s701, obtaining a preset second count value b=0, where the second count value is used to count the number of times that the target server returns the first response information to the target gateway but does not receive the key instruction.
S702, obtaining H j Corresponding working state identification S of final server j The working state identifier is an identifier of a working state, and one skilled in the art knows that any method for obtaining the working state of the server in the prior art belongs to the protection scope of the present invention.
Specifically, the operating state includes: online state, offline state.
S703, when S j When the identification is '3', the control target gateway sends out a first instruction to acquire H j And returning the first response information to the target gateway according to the corresponding fourth address information, wherein the manner of acquiring the fourth address information is known to those skilled in the art to be the same as the manner of acquiring the second address information, and is not described herein.
Specifically, the label "3" is: the server is online.
S704, when H j And after the corresponding server returns the first response information to the target gateway, waiting for the target gateway to send out a key instruction.
S705, when H j When the corresponding target server receives the key instruction, H is determined j Corresponding fourth address information is taken as H j The corresponding final address information and the first instruction response information are obtained, where those skilled in the art know that the manner of obtaining the first instruction response information in step S705 is the same as the manner of obtaining the first instruction response information in steps S3026 to S3028, and details thereof are not repeated herein.
S706, when H j When the corresponding target server does not receive the key instruction, let b=b+1.
S707, if the current time point is equal to H j The time interval between the time points of the corresponding server returning the first response information to the target gateway is not less than T 0 And b is less than or equal to 100, executing S702.
S708, if the current time point is equal to H j The time interval between the time points of the corresponding server returning the first response information to the target gateway is smaller than T 0 Not to target gateway and H j The corresponding final server does any processing.
S709, if the current time point and H j The time interval between the time points of the corresponding server returning the first response information to the target gateway is not less than T 0 And b > 100, S is determined j To identify "4".
Specifically, the label "4" is: the server is in an offline state.
S710, when S j When the mark is '4', H is acquired j Corresponding off-line time length U of final server j The offline time length is the time length between the time point when the final server is in the offline state and the current time point.
S711, when U j ≤U 0 When not aiming at the target gateway and H j The corresponding final server performs any processing, U 0 The sleep time is preset.
Specifically, U 0 =500 milliseconds.
S712, when U j ＞U 0 When the control target gateway sends out a first instruction, H is updated j And the corresponding fourth address information returns the first response information to the target gateway.
S713, when H j And after the corresponding server returns the first response information to the target gateway, waiting for the target gateway to send out a key instruction.
S714, when H j When the corresponding target server receives the key instruction, determining S j To identify "3".
S715, let b=1, and execute step S705.
S716, when H j When the corresponding target server does not receive the key instruction, the current time point is taken as the time point for determining that the final server is in an offline state, and step S711 is performed.
When a certain final server is offline due to the hot plug and other conditions, the gateway controls the address line of the last final server of the final server to reassign the address to the current final server, so that the situation that address assignment errors or address assignment conflicts cannot exist can be avoided, and the uniqueness and continuity of the address can be ensured.
The invention provides an address information distribution system based on an RS485 protocol, which comprises: the target server ID list, the processor and the memory storing the computer program, when the computer program is executed by the processor, the following steps are implemented: according to the target server ID list, an address line ID list corresponding to the target server ID list is obtained; acquiring an address line control byte; and acquiring a target address information list corresponding to the target server ID list according to the address line ID list and the address line control byte. It can be seen that the present invention adds the address line based on the original RS485 bus communication, and the gateway sends the instruction to determine whether to perform the address allocation operation to the target servers through the address control line, so that it can ensure that only one target server is in the state of receiving the address in the same time period, when the condition such as hot plug occurs to cause the off-line of a certain server, the gateway controls the address line of the previous server of the server to reallocate the address to the current server, so that the condition of address allocation error or address allocation conflict does not exist, and the uniqueness and continuity of the address can be ensured.
While certain specific embodiments of the invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the invention. Those skilled in the art will also appreciate that many modifications may be made to the embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (10)
1. An RS485 protocol based address information distribution system, the system comprising: target server ID list a= { a 1 ，A 2 ，……，A i ，……，A m A processor and a memory storing a computer program, wherein A i For the i-th target server ID, i=1, 2 … … m, m is the number of target server IDs, when the computer program is executed by the processor, the following steps are implemented:
s100, according to A, obtaining an address line ID list B= { B corresponding to A 1 ，B 2 ，……，B i ，……，B m-1 }，B i Is A i Address line ID corresponding to the corresponding target server;
s200, acquiring an address line control byte C, wherein the address line control byte is one byte in an RS485 protocol;
s300, according to B and C, obtaining a target address information list D= { D corresponding to A 1 ，D 2 ，……，D i ，……，D m }，D i Is A i The corresponding target address information includes the following steps in S300 to obtain D i ：
S301, setting a state of a level of an address line corresponding to a target gateway to be in a first level state, wherein the first level state is a state when the level is in a low level state, and the system further comprises a preset first count value a=1, and the first count value is used for counting the times that the target gateway receives first instruction response information;
s302, controlling the target gateway to send out a first instruction to acquire D i The first instruction is used for giving A i The corresponding target server allocates address information, wherein i=a, if D has been acquired i Returning first instruction response information to the target gateway;
s303, if the target gateway acquires the first instruction response information, executing a step S304; otherwise, executing S302;
s304, if a=1, executing step S305; otherwise, executing S306;
s305, setting the state of the level of the address line corresponding to the target gateway to be in a second level state, wherein the second level state is a state when the level is in a high level, and executing S307;
s306, the control target gateway sends out a third instruction, wherein the third instruction is used for setting C as a second identifier so that B (i-1) The state of the level of the corresponding address line is in a second level state, wherein i=a;
s307, the control target gateway sends out a second instruction; the second instruction is used for setting C as a first identifier so that the target gateway controls B i The state of the level of the corresponding address line is in the first level state, and step S309 is performed, where i=a;
s308, the control target gateway sends out a fourth instruction, wherein the fourth instruction is used for setting C as a first identifier so that A is the first identifier (i-1) Corresponding target server control B i The state of the level of the corresponding address line is in the first level state, and step S309 is performed, where i=a;
s309, let a=a+1, and execute step S200.
2. The RS485 protocol based address information distribution system according to claim 1, wherein the target gateway corresponds to one address line.
3. The RS485 protocol based address information distribution system according to claim 2, wherein the target gateway is communicatively connected to the first target server through an address line corresponding to the target gateway.
4. The RS485 protocol based address information distribution system according to claim 3, wherein a i Corresponding target server and A i+1 The corresponding target server passes B i The corresponding address lines are communicatively connected.
5. The RS485 protocol based address information distribution system according to claim 4, wherein the target gateway and the target server are further in communication connection through an RS485 bus and an RS485 protocol.
6. The RS485 protocol based address information distribution system according to claim 1, wherein the address information is a character string composed of numerals or letters.
7. The RS485 protocol based address information distribution system according to claim 1, wherein an initial state of a level of an address line corresponding to a first address line ID is in a first level state.
8. The RS485 protocol based address information distribution system according to claim 1, wherein the first identification is an identification "0" or an identification "1", and the second identification is an identification "0" or an identification "1".
9. The RS485 protocol based address information distribution system according to claim 8, wherein the first identity is different from the second identity, i.e. if the first identity is the identity "0", the second identity is the identity "1", and if the first identity is the identity "1", the second identity is the identity "0".
10. The RS485 protocol based address information distribution system according to claim 1, characterized in that, in step S302, it comprises the steps of:
s3021, acquisition A i Corresponding first address information E i ；
S3022, when B i When the state of the level of the corresponding address line is in the first level state, executing step S3023, otherwise, executing step S3021;
s3023, obtain E i Similarity F of address information with preset address information i The similarity of the address information is the similarity between the two address information;
s3024, when F i When=1, the RS485 protocol is parsed to obtain a i Corresponding second address information G i Returning first response information to the target gateway, wherein the first response information is characterized in that address setting is completed;
s3025, when A i After the corresponding server returns the first response information to the target gateway, waiting for the target gateway to send out a key instruction;
s3026, when A i When the corresponding target server receives the key instruction, executing step 3027;
s3027, if the current C is the mark "1", acquiring first instruction response information;
s3028, if the current C is not the mark "1", acquiring first instruction response information;
s3029, when A i And when the corresponding target server does not receive the key instruction, acquiring first instruction response information.
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