Data differential transmission method based on smart meter and concentrator

Abstract

The application discloses a data transmission method based on smart meters and concentrators, comprising the following steps: step 1: a sender converts original information to be sent into binary codes, and divides the binary codes into groups by two bits, obtaining a plurality of code groups; step 2: performing compression operation on the information of the code groups; step 3: dividing the compressed information into information groups of any length to obtain encrypted information; step 4: when sending information, the sender sends original code zero level for original code 0, sends original code high level for original code 1, and sends negative level of inverse code for inverse code; and step 5: a receiver receives the encrypted information and converts the encrypted information into original information. The application provides a data transmission method based on smart meters and concentrators, which can reduce the number of interactive information among the smart meters, the concentrators and the servers.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric meter data transmission, in particular to a data transmission method based on smart meter and concentrator. BACKGROUND

[0002] The information transmitted by the existing smart meter and concentrator is very complex. The smart meter collects many types of power consumption information. Although the information is compressed in a certain format before being sent, the information interaction time between the smart meter and the concentrator is still too long when the smart meter and the concentrator interact with each other to send information to the smart meter, which leads to a long meter reading time of the concentrator. SUMMARY

[0003] The summary part of the present application is used to introduce the concept in a brief form, which will be described in detail in the specific embodiment part. The summary part of the present application is not intended to identify the key features or essential features of the claimed technical solution, nor is it intended to limit the scope of the claimed technical solution.

[0004] In order to solve the problem that the information interaction between the concentrator and the smart meter is slow and the meter reading time is long because too much information needs to be sent, some embodiments of the present application provide a data transmission method based on smart meter and concentrator, which includes the following steps:

[0005] Step 1: The sender converts the original information to be sent into binary code, and divides the binary code two by two bit positions into a group to obtain a plurality of encoding groups;

[0006] Step 2: The information of the encoding group is compressed, wherein

[0007] The encoding group of 00 is compressed into 0 and marked as original code;

[0008] The encoding group of 11 is compressed into 1 and marked as original code;

[0009] The encoding group of 01 is compressed into x and marked as inverse code;

[0010] The encoding group of 10 is compressed into x and marked as inverse code;

[0011] Step 3: The compressed information is divided into information groups of any length to obtain encrypted information, and the marked information of the inverse code is added behind each information group;

[0012] Step 4: the sender sends the information of the information group, for the original code 0, sends the low level of the set time length, for the original code 1, sends the high level of the set time length, for the inverse code x, sends the high level of the set time length negative;

[0013] In the sending of the mark information, the low level of the set time length is sent for the inverse code of 01 compression, the high level of the set time length is sent for the inverse code of 10 compression;

[0014] Step 5: the receiver receives the encrypted information, determines the position corresponding to the original inverse code in each information group, then decompresses the original code information according to the compression rule, and decompresses the inverse code information according to the mark information.

[0015] In the intelligent electric meter and the concentrator, the original information sent is binary code, for this, in the scheme, the binary code is divided into a group of two-bit positions, then two bytes are compressed into one byte, and are divided into original code and inverse code; at the same time, the inverse code uses negative high level for marking. Therefore, for the original information, the transmission time of the original code of two-bit positions after compression to one-bit position is reduced by half, for the inverse code, two-bit positions are compressed into one-bit position, and then a mark information is added, so the transmission time of the inverse code is essentially not increased. In this way, in the case that the transmission time of the original code is reduced by half, the information interaction time between the intelligent electric meter and the concentrator can be greatly reduced; and in the scheme, no matter which format of compression is used for the information sent by the intelligent electric meter, the scheme can be used for further compression, reducing the information transmission time between the intelligent electric meter and the concentrator.

[0016] Further, the mark information corresponding to 01 is set to 0, and the mark information corresponding to 10 is set to 1; the mark information is 0, and the low level of the set time length is sent, the mark information is 1, and the high level of the set time length positive is sent.

[0017] Further, in step 3, the number of each information group is 16-bit binary code.

[0018] Each information group is the same number of binary codes, so the receiver can know the information node sent by the sender. The number of mark information can be known according to the number of inverse code data. For example, in the current original information group of 16-bit positions, there are 5 inverse code information, and the number of mark information is 5, and the last information group plus the number of mark information is 21-bit positions. The number of information groups is fixed, and the number of mark information is calculated by the number of inverse code information in the information group. In this way, the corresponding mark information can be easily added after the information group. And in the case of forming the information group according to the fixed format, the end identifier does not need to be set at the end of each information group, which causes the problem of expansion after compression of the information.

[0019] Further, in step 4, the information group and the marking information of the information group are sent in sequence.

[0020] The information group and the marking information of the information group are sent alternately, and then the position marked by the marking information can be known. After receiving the information group, the information behind the information group is the marking information of the information group, and the information behind the marking information is the information of the next information group. Therefore, in the case that the information group and the marking information are sent alternately, the sender and the receiver know that the correspondence between the marking information and the information group does not need to be implanted in the information.

[0021] Further, for the inverse code x of 01 compression, a low set duration low voltage is sent on the high-voltage communication line, a set duration high voltage is sent on the low-voltage communication line, then a low set duration low voltage is sent on the high-voltage communication line, and a set duration low voltage is sent on the low-voltage communication line.

[0022] For the inverse code x of 10 compression, a low set duration low voltage is sent on the high-voltage communication line, a set duration high voltage is sent on the low-voltage communication line, then a low set duration high voltage is sent on the high-voltage communication line, and a set duration low voltage is sent on the low-voltage communication line.

[0023] When the information is sent in the above manner, the inverse code information is sent first, and then the marking information is sent, so that the receiver can understand and complete the decoding according to the marking information after the inverse code information.

[0024] Step 5 specifically comprises: the receiver receives the encrypted information, determines the position corresponding to the original inverse code in each information group, and then decompresses the original code information according to the compression rule, and when the inverse code is encountered, the inverse code information is decompressed according to the marking information after the inverse code.

[0025] In the present scheme, different level signals are sent on the high-voltage communication line and the low-voltage communication line respectively, so that three kinds of signals can be formed, which correspond to the original code 1, the original code 0, and the inverse code x. In this way, in the present scheme, the characteristics of three different kinds of information can be formed by means of differential information transmission; two of the four possible binary encodings are marked by separate signals, and the remaining two are combined into one, which is collectively referred to as the inverse code, and is represented by the last kind of signal, so the signal is compressed to a certain extent. Moreover, the communication signal is still a differential signal, and the receiver needs to analyze the voltage difference between the two communication lines, and the anti-interference performance is still retained.

[0026] Further, in step 3, each information group is sent separately, and after all the information groups are sent, the marking information is sent.

[0027] Further, step 4 specifically comprises:

[0028] The sender sends a low voltage for a set time length for 0 of the original code on both the high voltage communication line and the low voltage communication line when sending the information of the information group;

[0029] The sender sends a high voltage for a set time length on the high voltage communication line and a low voltage for a set time length on the low voltage communication line for 1 of the original code;

[0030] The sender sends a low voltage for a set time length on the high voltage communication line and a high voltage for a set time length on the low voltage communication line for the inverse code x.

[0031] Further, step 5 comprises the following steps:

[0032] Step 51: receiving the encrypted information, distinguishing the inverse code and the original code in each information group;

[0033] Step 52: analyzing the number N of the inverse code x in each information group, and recording the last N binary codes of the information group as the mark information;

[0034] Step 53: decompressing the original code according to the compression rule, and decompressing the inverse code according to the mark information of the information group in turn, the original code 0 is analyzed as 00, the original code 1 is analyzed as 11, the inverse code bit is analyzed as 10 when the mark information is 1, and the inverse code bit is analyzed as 01 when the mark information is 0.

[0035] In the scheme, the receiver can directly identify which is the original code and which is the inverse code according to the received level signal when receiving the information, a set time length of positive high voltage signal is received when the original code 1 is received, a set time length of positive low voltage signal is received when the original code 0 is received, and a set time length of negative voltage signal is received when the inverse code information is received, so that the receiver can directly identify the original code and decompress it according to the compression rule, and also know the number and position of the inverse code in each information group, and then know the compression rule of the inverse code x according to the subsequent mark information, and further analyze the inverse code.

[0036] Further, the maximum amplitude of the low voltage is 0.5V, and the minimum amplitude of the high voltage is 2.5V.

[0037] Further, the set time length of the low voltage and the high voltage is 1us.

[0038] In summary: the application provides a solution to avoid the problem that the information interaction time between a single electric meter and a concentrator is too long, and the concentrator takes a long time to copy the meter. BRIEF DESCRIPTION OF DRAWINGS

[0039] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application and are incorporated in and constitute a part of this application. The illustrations, together with their description, serve to explain the application.

[0040] In addition, and where used in the disclosure and / or claims, the indefinite articles "a" and "an" are to be interpreted as meaning "at least one" or "one or more." Moreover, throughout the drawings, like reference numerals are used to designate like elements. It should be understood that the drawings are schematic and elements and features are not necessarily to scale.

[0041] In the drawings:

[0042] Figure 1 The smart meter and concentrator based data transmission method provided in the present application.

[0043] Figure 2 The flowchart of the information group from the sender to the receiver provided in the present application. DETAILED DESCRIPTION

[0044] Embodiments of the present disclosure will be described in more detail with reference to the drawings. Although certain embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be embodied in various forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure can be more thoroughly and completely understood. It should be understood that the drawings of the present disclosure and the embodiments are only for exemplary purposes and are not intended to limit the scope of protection of the present disclosure.

[0045] It should also be noted that, for the sake of brevity, only the parts of the drawings that are relevant to the present application are shown. The embodiments in the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0046] The present disclosure will be described in detail with reference to the drawings and in conjunction with embodiments.

[0047] Reference Figure 1 and Figure 2 The smart meter and concentrator based data differential transmission method is applied between the smart meter and the concentrator, the smart meter and the concentrator are connected by wired signals, and differential signal transmission is adopted. That is, the smart meter and the concentrator are connected by two signal lines. One line is a high-voltage communication line, and the other line is a low-voltage communication line; both the high-voltage communication line and the low-voltage communication line can pass through high-voltage and low-voltage levels; the receiver analyzes the information according to the difference between the signal amplitudes received by the two signal lines in the same period.

[0048] To this end, for this application scenario, the present application provides the following smart meter and concentrator based data differential transmission method, comprising:

[0049] Step 1: The sender converts the original information to be sent into binary code, and divides the binary code into groups of two bits each, obtaining a number of code groups.

[0050] The original information to be sent is binary information, which is distinguished by combinations of 0 and 1. Converting the original information into binary code is actually just reading out the storage format of the original information to be sent in binary code.

[0051] For example, the sender needs to send the information that user A has used 10 degrees of electricity to the receiver. The underlying storage method of this information in the sender is binary code, so converting the original information into binary code is actually just reading out the storage format of the original information to be sent in binary code.

[0052] For example, for a binary code of 1011111000111111, after grouping, the following code groups can be obtained: 10, 11, 11, 10, 00, 11, 11, 11.

[0053] Step 2: Step 2: compress the information of the code groups, wherein

[0054] 00 code group is compressed to 0 and marked as original code;

[0055] 11 code group is compressed to 1 and marked as original code;

[0056] 01 code group is compressed to x and marked as inverse code;

[0057] 10 code group is compressed to x and marked as inverse code.

[0058] For example, when the binary code is 01 or 10, it is compressed to x here, which actually means that the two-bit 01 or 10 is compressed to one-bit binary code, and then marked as inverse code. The specific compression of 0 or 1 in binary code is not limited, so x is used to represent it. As can be seen, in step 2, the key is to compress 01 or 10 to one-bit binary code and then mark it with inverse code.

[0059] For example, for a binary code of 1011111000111111, after grouping, the following code groups can be obtained: 10 / 11 / 11 / 10 / 00 / 11 / 11 / 11.

[0060] So according to the compression rule, the "10" in the first group is compressed as x, the "x" is marked as inverse code. The "11" in the second group is compressed as 1, the "1" is marked as original code. The "11" in the third group is compressed as 1, marked as original code. The "10" in the fourth group is compressed as x, marked as inverse code…, and so on. Finally, the compressed information is: x11x0111. In this way, the original 16-bit binary code is compressed to 8-bit binary code, thereby reducing the amount of information to be transmitted.

[0061] Step 3: The compressed information is divided into information groups of any length to obtain encrypted information, and the marking information of the inverse code is added after each information group.

[0062] For example, for the original binary code of 1011111000111111, the final compressed information is: x11x0111, and the inverse code has 2 bits, so the marking information is 2 bits. For example, the marking information of 0 can represent the inverse code of the original code as 01, and the marking information of 1 can represent the inverse code of the original code as 10.

[0063] In step 3, the number of each information group is 16-bit binary code.

[0064] In this scheme, the number of binary codes in each information group is set to 16, and in other embodiments, it can also be set to other numbers. Essentially, the number of binary codes in each information group needs to be in a fixed format, that is, the sender and the receiver are pre-configured. In addition to the above scheme, in which each information group is set to the same number of binary codes, in some embodiments, the number of binary codes in each information group can also be set to an arithmetic sequence, such as 8 binary codes in the first information group, 16 binary codes in the second information group, 32 binary codes in the third information group…, which can also be used in practice. Essentially, the sender and the receiver need to pre-configure the division rule of the information group. In this embodiment, in order to facilitate representation, the number of each information group is set to 16-bit binary code. Therefore, after knowing the number of binary codes in each information group, the boundary of each information group is known, and it can be distinguished which is the original information and which is the marking information.

[0065] In step 3, the marking information of the inverse code is also added to each information group, which is used to mark the compression rule of the inverse code in each information group. The inverse code of the encoding group of 01 is marked as 0, and the inverse code of the encoding group of 10 is marked as 1.

[0066] For example, assume that a string of compressed information is x11x0111…: this string of information is exactly 16 binary codes, so it can be taken as a group of information, and among the 16 binary codes, the first bit is the inverted code x, which is compressed from "10"; the fourth bit is also the inverted code, which is compressed from "10", and the rest are the original codes, so the group of information only shows the first 8 bits.

[0067] Therefore, among the 16 binary codes, there are two inverted codes, so two bits of marking information need to be added at the end of the group of information. Because the inverted code of the "10 code group is marked as 1, and the inverted code of the 01 code group is marked as 0", so the group of information plus the marking information is finally: 101111100011111111. The first 16 binary codes are the information to be sent, and the last 2 binary codes are used to mark the inverted code information of the front.

[0068] Step 4: When the sender sends the information of the group of information, for the original code 0, a positive low voltage is sent; for the original code 1, a positive high voltage of a set duration is sent, for the inverted code x, a negative high voltage of a set duration is sent, and for the inverted code of 01 compression, a low voltage of a set duration is sent, and for the inverted code of 10 compression, a high voltage of a set duration is sent.

[0069] Step 4 specifically includes:

[0070] When the sender sends the information of the group of information, for the original code 0, a low voltage is sent on both the high-voltage communication line and the low-voltage communication line.

[0071] For the original code 1, a high voltage of a set duration is sent on the high-voltage communication line, and a low voltage of a set duration is sent on the low-voltage communication line.

[0072] For the inverted code x, a low voltage of a set duration is sent on the high-voltage communication line, and a high voltage of a set duration is sent on the low-voltage communication line.

[0073] Among them, the maximum amplitude of the low voltage is 0.5V, and the minimum amplitude of the high voltage is 2.5V. The low voltage is set to within 0.5V to facilitate the identification of the low voltage and improve the anti-interference ability of the information. The high voltage is set to 2.5V in this embodiment, and in other embodiments, it can also be designed according to the needs.

[0074] The period of the low voltage and the high voltage is 1us. The duration of the low voltage and the high voltage is mainly set according to the sensitivity of the receiver. In 1us, it is a commonly used communication period in smart meter and concentrator communication.

[0075] Taking the information group "x11x0111..." as an example, which has 16 bits of binary code, only the first and fourth bits of the front 8 bits of binary code are inverse codes, and the marking information is 11, so the sender sends the information of "x11x0111...11" when sending the information group.

[0076] wherein,

[0077] sending

[0078] When the first bit is "x", the high-voltage communication line sends a low level of 0.5V or less for 1us, and the low-voltage communication line sends a high level of 2.5V or more for 1us;

[0079] When the second bit is "1", the high-voltage communication line sends a high level of 2.5V or more for 1us, and the low-voltage communication line sends a low level of 0.5V or less for 1us;

[0080] When the third bit is "1", the high-voltage communication line sends a high level of 2.5V or more for 1us, and the low-voltage communication line sends a low level of 0.5V or less for 1us;

[0081] When the fourth bit is "x", the high-voltage communication line sends a low level of 0.5V or less for 1us, and the low-voltage communication line sends a high level of 2.5V or more for 1us;

[0082] When the fifth bit is "0", the high-voltage communication line sends a low level of 0.5V or less for 1us, and the low-voltage communication line sends a low level of 0.5V or less for 1us;

[0083] Up to here, the information of the information group has been sent, and then the marking information is continuously sent:

[0084] When the seventeenth bit is "1", the high-voltage communication line sends a high level of 2.5V or more for 1us, and the low-voltage communication line sends a low level of 0.5V or less for 1us;

[0085] When the eighteenth bit is "1", the high-voltage communication line sends a high level of 2.5V or more for 1us, and the low-voltage communication line sends a low level of 0.5V or less for 1us.

[0086] The level of 0.5V or less is preferably a 0 level, and the level of 2.5V or more is preferably a 3.3V level.

[0087] Therefore, according to the above manner, all the information in the information group and the information for marking the inverse codes in the information group can be sent to the receiver.

[0088] In step 5, the receiver receives the encrypted information, determines the position of the original code in each information group, and then decompresses the original code information according to the compression rule, and decompresses the inverse code information according to the mark information after the inverse code.

[0089] Step 5 includes the following steps:

[0090] Step 51: Receive encrypted information, distinguish inverse code and original code in each information group;

[0091] Step 52: Analyze the number N of inverse codes x in each information group, and record the last N binary codes of the information group as mark information;

[0092] Step 53: Decompress the original code according to the compression rule, and decompress the inverse code according to the mark information after the information group. The original code 0 is parsed as 00, the original code 1 is parsed as 11, the inverse code bit corresponding to the mark information 1 is parsed as 10, and the inverse code bit corresponding to the mark information 0 is parsed as 01.

[0093] When the receiver receives this string of information, it can determine the number of inverse codes in an information group and their positions according to the received signal.

[0094] For example, take the information group "x11x0111…" as an example. The first and fourth bits are inverse codes, and their mark information is 11, so the sender sends the information x11x0111…11 when sending the information group. The last two bits are added mark information.

[0095] Therefore, the receiver will receive the following information in turn:

[0096] The high-voltage communication line receives 0, 1us low voltage, and the low-voltage communication line receives 3.3V, 1us high voltage; At this time, it is identified as the first bit, because the voltage difference between high voltage and low voltage is -3.3V, so the first bit is marked as inverse code x.

[0097] The high-voltage communication line receives 3.3V, 1us high voltage, and the low-voltage communication line receives 0V, 1us low voltage;

[0098] At this time, it is identified as the first bit, because the voltage difference between high voltage and low voltage is 3.3V, so the second bit is marked as original code 1, and then decompressed as 11, so the information received at this time is x11.

[0099] The high-voltage communication line receives 3.3V, 1us high voltage, and the low-voltage communication line receives 0V, 1us low voltage;

[0100] At this time, it is identified as the third bit, because the voltage difference between high voltage and low voltage is 3.3V, so the third bit is marked as original code 1, and then decompressed as 11, so the information received at this time is x1111.

[0101] The high-voltage communication line receives 0V, 1us low level, and the low-voltage communication line receives 3.3V, 1us high level;

[0102] At this time, the fourth bit is identified, because the voltage difference between the high voltage and the low voltage is -3.3V, so the fourth bit is marked as the inverse code x, so the information received at this time is x1111x.

[0103] The high-voltage communication line receives 0V, 1us low level, and the low-voltage communication line receives 0V, 1us low level; at this time, the fifth bit is identified, because the voltage difference between the high voltage and the low voltage is 0V, so the fifth bit is marked as the original code 0, and then decompressed to 00, so the information received at this time is x1111x00.

[0104] …

[0105] Up to here, 16 information groups have been received and decompressed, so the information of the seventeenth and eighteenth bits is the mark information.

[0106] When the seventeenth bit is received, the high-voltage communication line receives 3.3V, 1us high level, and the low-voltage communication line receives 0V, 1us low level; at this time, the mark information of the seventeenth bit is identified as 1, and then the first inverse code is obtained by compression of 10.

[0107] When the eighteenth bit is received, the high-voltage communication line receives 3.3V, 1us high level, and the low-voltage communication line receives 0V, 1us low level; at this time, the mark information of the eighteenth bit is identified as 1, and then the second inverse code is obtained by compression of 10, so the original information obtained finally is: 1011111000…

[0108] The above description is only some of the preferred embodiments of the present disclosure and the explanation of the applied technical principles. Those skilled in the art should understand that the scope of the application involved in the embodiments of the present disclosure is not limited to the technical solutions formed by the specific combinations of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or equivalent features without departing from the above inventive concept. For example, the above features are replaced with each other to form technical solutions with similar functions disclosed in the embodiments of the present disclosure (but not limited to).

Claims

1. A data differential transmission method based on smart meter and concentrator, characterized in that, The method comprises the following steps: Step 1: the sender converts the original information to be sent into binary code, and divides the binary code into groups by two bits each, obtaining a plurality of code groups; Step 2: the information of the code groups is compressed, wherein The code group of 00 is compressed into 0 and marked as original code; The code group of 11 is compressed into 1 and marked as original code; The code group of 01 is compressed into x and marked as inverse code; The code group of 10 is compressed into x and marked as inverse code; Step 3: the compressed information is divided into information groups of any length to obtain encrypted information, and the marking information of the inverse code is added after each information group; Step 4: when the sender sends the information of the information groups, for the original code 0, a positive low voltage of a set time length is sent; for the original code 1, a positive high voltage of a set time length is sent; and for the inverse code x, a negative high voltage of a set time length is sent; When the marking information is sent, for the inverse code of the 01 compression, a low voltage of a set time length is sent; and for the inverse code of the 10 compression, a high voltage of a set time length is sent; Step 5: the receiver receives the encrypted information, determines the positions of the original and inverse codes in each information group, then decompresses the original code information according to the compression rule, and decompresses the inverse code information according to the marking information.

2. The smart meter and concentrator based data differential transmission method according to claim 1, characterized in that: In step 3, the marking information corresponding to 01 is set to 0, and the marking information corresponding to 10 is set to 1; if the marking information is 0, a low voltage of a set time length is sent, and if the marking information is 1, a positive high voltage of a set time length is sent.

3. The smart meter and concentrator based data differential transmission method of claim 1, wherein: In step 3, the number of each information group is 16-bit binary code.

4. The smart meter and concentrator based data differential transmission method of claim 1, wherein: In step 4, the information groups and the marking information of the information groups are sent in sequence.

5. The smart meter and concentrator based data differential transmission method of claim 1, wherein: Step 4 specifically comprises: For the inverse code x of the 01 compression, a low voltage of a set time length is sent on the high-voltage communication line, a high voltage of a set time length is sent on the low-voltage communication line, then a low voltage of a set time length is sent on the high-voltage communication line, and a low voltage of a set time length is sent on the low-voltage communication line; For the inverse code x of the 10 compression, a low voltage of a set time length is sent on the high-voltage communication line, a high voltage of a set time length is sent on the low-voltage communication line, then a high voltage of a set time length is sent on the high-voltage communication line, and a low voltage of a set time length is sent on the low-voltage communication line; Step 5 specifically comprises: the receiver receives the encrypted information, determines the positions of the original and inverse codes in each information group, then decompresses the original code information according to the compression rule, and decompresses the inverse code information according to the marking information after the inverse code.

6. The smart meter and concentrator based data differential transmission method of claim 1, wherein: In step 3, each information group is sent separately, and after all the information groups are sent, the marking information is sent.

7. The smart meter and concentrator based data differential transmission method of claim 1, wherein: Step 4 specifically comprises: When the sender sends the information of the information groups, for the original code 0, a low voltage of a set time length is sent on both the high-voltage communication line and the low-voltage communication line; For the original code 1, a high voltage of a set time length is sent on the high-voltage communication line, and a low voltage of a set time length is sent on the low-voltage communication line; For the inverse code x, a low voltage of a set time length is sent on the high-voltage communication line, and a high voltage of a set time length is sent on the low-voltage communication line.

8. The data differential transmission method based on the smart meter and the concentrator according to claim 1, characterized in that: Step 51: the encrypted information is received, and the inverse code and the original code in each information group are distinguished; Step 52: Analyzing the number N of inverse codes x in each information group, and recording the last N binary codes of the information group as mark information; Step 53: Decompressing the original code according to the compression rule, and sequentially decompressing the inverse code according to the mark information after the information group, wherein the original code 0 is analyzed as 00, the original code 1 is analyzed as 11, the inverse code bit is analyzed as 10 when the corresponding mark information is 1, and the inverse code bit is analyzed as 01 when the corresponding mark information is 0.

9. The smart meter and concentrator based data differential transmission method of claim 6, wherein: The highest amplitude of the low level is 0.5V, and the lowest amplitude of the high level is 2.5V.

10. The smart meter and concentrator based data differential transmission method of claim 6, wherein: The setting time of the low level and the high level is 1us.

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