Short message modem communication method and system

Abstract

According to the short message modem communication method and system, a network access request is sent through a wireless module, communication networking is carried out, and then the high-portability engineer communication capacity is achieved. As the local GSM modem can receive the data text of the field equipment by using the 485 communication port or / and the Ethernet communication port, engineers can send out the acquired data of the field equipment by using the local GSM modem, so that the communication capability of the engineers is greatly improved, the communication capability of specific professional data between the engineers is facilitated, and the communication efficiency of the engineers is improved. And the efficiency of an engineer for handling emergencies of the field equipment on site is improved. More specifically, through the processing of the data text of the field device, the local short message modem can convert the data text into a short message or a long message and split the long message, so that the high-speed transmission of the field information is realized.

Description

Technical Field

[0001] The present application relates to the technical field of communication equipment, and in particular to a method and system for short message cat communication. Background Art

[0002] As a communication device terminal for group text messages, SMS cats are widely used in the actual construction process of engineers, which is conducive to engineers receiving construction disposal information in real time and improving the coordination of on-site work. With the widespread use of SMS cats, SMS cats need at least one computer to assist in sending and receiving text messages, which greatly restricts the portability of SMS cats. The defect of low portability makes it impossible for engineers to carry SMS cats and use SMS cats for mobile communications. This greatly reduces the ability of engineers to feedback on-site problems and deal with on-site emergencies. To this end, it is necessary to propose a SMS cat communication method and system to address the defect of low portability of traditional SMS cats. Summary of the invention

[0003] Based on this, it is necessary to propose a SMS modem communication method and system to address the defect of low portability of traditional SMS modems.

[0004] The present application provides a short message cat communication method, comprising:

[0005] Sending a network access request to the communication provider server based on the wireless module;

[0006] After the communication provider server responds to the network access request with the result of approving the network access, a communication link is established with the communication provider server;

[0007] Utilize 485 communication port and / or Ethernet communication port to receive data text sent by field equipment;

[0008] Determine whether the data volume of the received data text matches the data volume of the short message;

[0009] If the data volume of the received data text matches the data volume of the short message, the data text is compiled into a short message;

[0010] If the data volume of the received data text does not match the data volume of the short message, the data text is compiled into a long message;

[0011] Determine whether the text type after data text compilation is a long message;

[0012] If the text type after the data text is compiled is a long message, the long message is disassembled into multiple short messages, and all the short messages are transmitted through the communication link;

[0013] If the text type after the data text is compiled is a short message, all short messages are transmitted through the communication link.

[0014] The present application provides a short message cat communication system, comprising:

[0015] A local SMS modem, used to execute the SMS modem communication method;

[0016] A standby SMS modem, which is communicatively connected with the local SMS modem;

[0017] A mobile base station, connected to the local SMS modem for communication;

[0018] A communication provider server, connected to the local SMS modem for communication;

[0019] The engineer's mobile terminal is connected to the local SMS modem for communication.

[0020] The present application relates to a method and system for SMS cat communication, which sends a network access request through a wireless module to perform communication networking, thereby realizing highly portable communication capabilities for engineers. Since the SMS cat can use the 485 communication port and / or the Ethernet communication port to receive data texts from field equipment, engineers can use the SMS cat to send the collected data from field equipment, which greatly improves the communication capabilities of engineers, facilitates the communication and exchange capabilities of specific professional data between engineers, and improves the efficiency of engineers in handling emergencies of field equipment on site. More specifically, through the processing of data texts of field equipment, the SMS cat can convert data texts into short messages or long messages, and split long messages to achieve high-speed transmission of field information. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of a method flow of a short message modem communication method provided in one embodiment of the present application.

[0022] Figure 2 A connection structure diagram of a short message modem communication system provided in one embodiment of the present application.

[0023] Reference numerals:

[0024] 100-local SMS modem; 200-spare SMS modem; 300-mobile base station 300; 400-communications provider server; 500-engineer's mobile terminal. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0026] The present application provides a short message cat communication method.

[0027] Optionally, the execution subject of the SMS modem communication method provided in the present application may be a local SMS modem.

[0028] like Figure 1 As shown, in one embodiment of the present application, a short message modem communication method includes:

[0029] S100, sending a network access request to a communication provider server based on a wireless module.

[0030] S200, after the communication provider server responds to the network access request with the result of agreeing to the network access, a communication link is established with the communication provider server.

[0031] Specifically, the local SMS modem can achieve independent communication tasks by networking with the communication provider's server. The communication modem can achieve high portability, which effectively improves the communication capabilities of engineers.

[0032] S300, using the 485 communication port and / or the Ethernet communication port to receive the data text sent by the field device.

[0033] Specifically, currently more industrial control machines use 485 communication or Ethernet communication. Using 485 communication ports and / or Ethernet communication ports to receive data from field devices can help engineers work collaboratively with back-end engineers, thereby improving engineers' on-site work efficiency.

[0034] S400, determining whether the data volume of the received data text matches the data volume of the short message.

[0035] S500: If the data volume of the received data text matches the data volume of the short message, compile the data text into a short message.

[0036] S600: If the data volume of the received data text does not match the data volume of the short message, compile the data text into a long message.

[0037] S700, determining whether the text type after the data text is compiled is a long message.

[0038] S800: If the text type of the compiled data text is a long message, the long message is disassembled into multiple short messages, and all the short messages are transmitted through the communication link.

[0039] Specifically, compiling the on-site information is beneficial to improving the communication rate of the local SMS modem.

[0040] S900: If the text type after the data text is compiled is a short message, all short messages are transmitted through the communication link.

[0041] Specifically, engineers who use the SMS cat communication method and system may be field engineers, system operation and maintenance engineers, project responsible personnel, etc. The SMS cat communication system may transmit real-time data of field equipment and may also send relevant alarm information.

[0042] The present application relates to a short message modem communication method, which sends a network access request through a wireless module to perform communication networking, thereby realizing highly portable communication capabilities for engineers. Since the local short message modem can use the 485 communication port and / or the Ethernet communication port to receive the data text of the field equipment, the engineer can use the local short message modem to send the collected data of the field equipment, which greatly improves the communication capabilities of the engineer, is conducive to the communication and exchange capabilities of specific professional data between engineers, and improves the efficiency of engineers in handling emergencies of field equipment on site. More specifically, through the processing of the data text of the field equipment, the local short message modem can convert the data text into a short message or a long message, and split the long message to achieve high-speed transmission of field information.

[0043] like Figure 2 As shown, in one embodiment of the present application, after S100 and before S200, the method includes:

[0044] S111, receiving a network access request sent by at least one standby SMS modem.

[0045] S112, select a network access request.

[0046] S113, parsing the device information of the backup SMS modem in the network access request.

[0047] S114, establishing a communication network connection relationship with the backup SMS modem.

[0048] S115, returning to the step of selecting a network access request until all network access requests are completed.

[0049] Specifically, the local SMS modem can be networked with the backup SMS modem, which is conducive to improving the convenience and portability of the communication network of the local SMS modem. The communication between the local SMS modem and the backup SMS modem is conducive to achieving the coverage area of ​​the communication network. Due to the wide distribution of on-site equipment and the lack of infrastructure construction in some construction sites, based on the communication capabilities of the local SMS modem, the local SMS modem can be used as a signal relay device to perform communication coverage tasks.

[0050] The local SMS modem in this embodiment acts as a signal relay device, which can achieve temporary coverage of the communication network area. It is based on a wireless module and inserts a SIM card to support its operation, which can improve the security of communication.

[0051] like Figure 2As shown, in one embodiment of the present application, after S100 and before S200, the method further includes:

[0052] S121, receiving information from the engineer's mobile terminal.

[0053] Specifically, when the local SMS modem is used as a signal relay device, it is equivalent to a temporary base station, which can rely on its own LTE network to communicate with the mobile terminals of engineers in the signal coverage area.

[0054] It is worth mentioning that by communicating via the wireless network, the local SMS modem can work independently and independently perform SMS sending and receiving tasks, which greatly improves the portability of the local SMS modem.

[0055] S122, requesting the database of the communication operator server to call the registration information of the mobile terminal in the database.

[0056] S123, after verifying that the information of the mobile terminal of the engineer matches the registered information of the mobile terminal in the database, the local SMS modem is connected to the local mobile base station based on the wireless module.

[0057] S124, returning the information of the mobile terminal of the receiving engineer until the information of the mobile terminals of all the receiving engineers is processed.

[0058] Specifically, the core network is a unit composed of a communication provider server, a mobile base station and a radio resource controller (not shown in the figure). The radio resource controller is set inside the mobile base station and is used to receive signals sent by the wireless module to realize the networking between the local SMS modem and the communication provider server.

[0059] Steps S921 to S925 of this embodiment reflect the process of the local SMS modem requesting data call from the database of the communication operator's server, which is actually the process of the local SMS modem connecting to the core network through the interface.

[0060] This embodiment is specifically explained as follows:

[0061] The local SMS modem receives mobile terminal information and networking requests sent by the engineer's mobile terminal.

[0062] The local SMS modem sends a database call data request to the communication provider server, and calls the record information of the engineer's mobile terminal stored in the database of the communication provider server.

[0063] The local SMS modem determines whether the mobile terminal information sent by the mobile terminal matches the record information of the engineer's mobile terminal.

[0064] If the mobile terminal information sent by the mobile terminal matches the registered information of the engineer's mobile terminal, the local SMS modem connects the local SMS modem itself to the local mobile base station based on the wireless module.

[0065] In order to prevent the emergence of fake base stations, when the communication operator server authorizes the local SMS modem to send short messages, it needs to determine the mobile terminal information communicating with the local SMS modem, such as the unique identification code of the mobile terminal, to prevent the local SMS modem from sending short messages to unauthorized devices.

[0066] Simply put, when the local SMS modem acts as a relay device, the local SMS modem can only send short messages to mobile terminals that have been authenticated by the communication operator's server.

[0067] The mobile terminal information sent by the mobile terminal may be a unique identification code of the mobile terminal. The mobile terminal of the engineer may be pre-registered on the communication operator's server, and the registration information of the mobile terminal of the engineer is generated and stored in the database of the communication operator's server.

[0068] Therefore, only when the mobile terminal information sent by the mobile terminal matches the registered information of the engineer's mobile terminal, the local SMS modem is considered to meet the networking requirements, that is, the local SMS modem can become a relay device for the communication operator's server.

[0069] Optionally, if the mobile terminal information sent by the mobile terminal is consistent with the record information of the engineer's mobile terminal, the mobile terminal information sent by the mobile terminal matches the record information of the engineer's mobile terminal. The consistency of the mobile terminal information sent by the mobile terminal and the record information of the engineer's mobile terminal includes but is not limited to the consistency of the unique identification code of the mobile terminal.

[0070] The mobile management entity processes the signaling messages of the local SMS modem, including user authentication, mobility management and signaling transmission. The data processing includes the service gateway and PDN gateway, which are responsible for the routing and forwarding of data packets.

[0071] Based on the wireless module access to the local mobile base station, a radio resource control connection is established for data transmission. The radio resource controller establishes the networking between the local SMS modem and the communication provider server, which specifically involves the broadcast, paging, and radio resource control connection management of the communication provider server. Once the radio resource control connection is successfully established between the local SMS modem and the communication provider server, the local SMS modem can perform signaling and data transmission with the core network.

[0072] In one embodiment of the present application, S200 includes:

[0073] S210, access the scheduling manager through the network element of the air interface.

[0074] Specifically, the network element of the air interface may be a radio resource controller. A dispatch manager is provided in the server of the communication operator in the core network to manage the base stations, repeaters and mobile terminals accessing the core network.

[0075] S220, sending a device identification frame of the local SMS modem to the scheduling manager.

[0076] S230, receiving a network-incoming data packet from a server gateway.

[0077] S240, parsing the incoming data packet.

[0078] S250, based on the parsed incoming data packet, a communication link is formed with the server.

[0079] Specifically, the wireless module of the local SMS modem is actually an eNB wireless communication module authorized by the service provider. eNB stands for evolved base station. As the only network element of the LTE wireless access network, the evolved base station not only maintains the wireless link with the terminal, but is also responsible for wireless resource management and some mobility management functions. The full name of eNB is Evolved Node B. eNB integrates some functions of RNC (radio network controller) and reduces the protocol layers during communication. This design makes the communication network structure of the communication modem flatter, simplifies the network nodes, and reduces system complexity and latency.

[0080] In one embodiment of the present application, S400 includes:

[0081] S410 parses the received data text based on the Modbus protocol.

[0082] Specifically, the Modbus protocol is the Modbus protocol, a serial communication protocol. For serial connections, there are two variants that differ slightly in the representation of numerical data and the details of the protocol. Modbus RTU is a compact, binary representation of data, and Modbus ASCII is a human-readable, verbose representation. Both variants use serial communication. The RTU format has a cyclic redundancy check checksum for subsequent commands / data, while the ASCII format uses a longitudinal redundancy check checksum.

[0083] Through Modbus ASCII in the Modbus protocol, the data of 485 communication can be converted into the data frame required by the short message.

[0084] S420, converting the received data text into readable text.

[0085] Specifically, the RS485 communication data is converted into a short message format to facilitate rapid transmission and processing of information.

[0086] It should be noted that all "485 communications" mentioned in this application refer to the communication method based on the RS485 communication protocol, and no further explanation will be given later. As a widely used serial communication standard, the RS485 communication protocol provides reliable data transmission in various environments with its advantages such as strong anti-interference ability and long transmission distance. Therefore, when the local SMS cat receives 485 communication data, the signal distortion rate is low and the information transmission is safe and reliable.

[0087] S430, selecting a format of a short message.

[0088] Specifically, RS485 data usually exists in binary or hexadecimal format, and short messages require these data to be converted into readable text form or a specific structured data format. For example, if the sensor data is stored in scientific notation as binary floating point numbers, these floating point numbers need to be converted into decimal ASCII representations. This ensures the accuracy and consistency of the data.

[0089] S440, based on the selected short message format, compile the contents of the readable text in sequence and obtain the number of characters of the readable text.

[0090] Specifically, the short message information includes Chinese characters, numbers and English characters, etc. When compiling and transmitting 485 communication data, numbers and English characters are mostly used. By transcoding English characters and numerical values, it is possible to determine whether the number of characters in the short message matches the number of characters in the readable text.

[0091] S450, determining whether the number of characters in the short message matches the number of characters in the readable text.

[0092] S460: If the number of characters in the short message matches the number of characters in the readable text, it is determined that the data volume of the received data text matches the data volume of the short message.

[0093] S470: If the number of characters in the short message does not match the number of characters in the readable text, it is determined that the data volume of the received data text does not match the data volume of the short message.

[0094] Specifically, by transmitting 485 communication data through short messages, it is possible to display and automatically and dynamically store the location reports and short message information of all subordinate local SMS cats within a specified time period, and realize the list statistics and inquiry of their information.

[0095] In one embodiment of the present application, S800 includes:

[0096] S811, split the long message into multiple data transmission parts.

[0097] Specifically, in the process of converting long messages to short messages, the control part and the data transmission part need to be kept separate, which helps to correctly parse and apply the data.

[0098] The structure of a long message includes a message header (data type ID, data quantity, ECC check bit), data and a 16-bit checksum. The maximum data quantity can reach 216-1 bytes, and includes detailed ECC check and CRC check polynomial x16+x12+x5+1.

[0099] S812, select a data transmission part.

[0100] S813, determining whether the data volume of the data transmission part matches the data volume of the short message.

[0101] Specifically, short messages contain less data and no checksum. They are mainly used for frame synchronization and line field synchronization, and their data area is used to record frame numbers and line numbers.

[0102] S814, if the data volume of the data transmission part matches the data volume of the short message, return to the step of selecting a data transmission part until all the data transmission parts are selected.

[0103] S815: If the data volume of the data transmission part does not match the data volume of the short message, split the data transmission part into at least two data transmission parts.

[0104] S816, adding the disassembled at least two data transmission parts into the data transmission part to be selected.

[0105] S817, returning to the step of selecting a data transmission part until all data transmission parts are selected and completed.

[0106] Specifically, the upper 2 bits are used for the virtual channel, and the lower 6 bits are the data type. Four virtual channels are supported, which can facilitate different channels to process different types of data. For the conversion of long messages to short messages, the data needs to be adjusted according to the DI encoding rules to ensure that the receiving end can parse it correctly.

[0107] In one embodiment of the present application, S800 further includes:

[0108] S821, assigning an information header to each data transmission part based on the transmission protocol format.

[0109] Specifically, the information header is the control part of the short message.

[0110] S822, select a format of a short message.

[0111] Specifically, the effective image data length of the long message can be arbitrary, while the short message limits the data area. During the conversion process, the effective data in the long message needs to be divided into small blocks suitable for the short message format.

[0112] S823, compile the information header and the data transmission part corresponding to the information header into a short message.

[0113] S824, select a short message.

[0114] S825: Determine the accuracy of the short message based on Hamming coding.

[0115] Specifically, Hamming-modified coding is used in long messages, which can correct 1-bit errors and detect 2-bit errors, which is crucial to ensure the accuracy of long message transmission. When converting to short messages, some check bits may need to be adjusted or omitted according to actual needs.

[0116] S826, determining whether the accuracy of the short message meets the accuracy standard.

[0117] S827: If the accuracy of the short message does not meet the accuracy standard, the short message is deleted.

[0118] S828, returning to the step of selecting a short message until all short messages are selected.

[0119] Specifically, the long message uses the CRC check method, and the check polynomial is x16+x12+x5+1. In the process of converting to a short message, since the short message itself does not contain a checksum, it is necessary to recalculate and add the check bit. Data cross-distinguishment is performed through data types or virtual channels to ensure that different data can be correctly extracted and parsed.

[0120] In one embodiment of the present application, S800 further includes:

[0121] S831, accepting interactive instructions.

[0122] S832, determine the short message sending object in the interaction instruction.

[0123] S833, when the short message is sent to the engineer's mobile terminal, the information of the engineer's mobile terminal input by the interaction end is received, and the short message sending task is executed.

[0124] Specifically, the information of the engineer's mobile terminal may be the phone number of the mobile terminal.

[0125] S834, when the short message is sent to a standby SMS modem, the short message sending task is performed on the standby SMS modem.

[0126] S835, when the short message is sent to a communication provider server, the short message sending task is executed using the communication link.

[0127] Specifically, the SMS modem, whether it is a local SMS modem or a backup SMS modem, has independent short message sending and receiving capabilities.

[0128] In the communication network of the local SMS modem, the local SMS modem can be networked with the engineer's mobile terminal, the local SMS modem can be networked with the backup SMS modem, and the local SMS modem can be networked with the communication provider's server. The local SMS modem can send at least one short message to the nodes of these communication networks, thereby realizing highly portable independent communication capabilities.

[0129] It is worth mentioning that short messages can be transmitted through mobile base stations during communication with the communication operator's server.

[0130] In one embodiment of the present application, S800 and subsequent steps include:

[0131] S841, receiving a short message.

[0132] S842, forming complete message information based on the information header of the short message.

[0133] S843, when the message information matches the data text of the field device, the message information is translated and imported into the field device through the 485 communication port and / or the Ethernet communication port.

[0134] S844, when the message information matches the data text of the engineer's mobile terminal, the message information is sent to the engineer's mobile terminal in sequence.

[0135] S845, when the message information matches the data text of the standby SMS modem, the message information is sent to the standby SMS modem.

[0136] Specifically, the local SMS modem, as a communication terminal, can forward the received short messages to the engineer's mobile terminal, the backup SMS modem, and the communication provider's server.

[0137] The present application provides a short message modem communication system.

[0138] like Figure 2 As shown, in one embodiment of the present application, a short message modem communication system includes a local short message modem 100, a backup short message modem 200, a mobile base station 300, a communication service provider server 400 and an engineer's mobile terminal 500.

[0139] The local SMS modem 100 is used to execute the SMS modem communication method mentioned in any one of the aforementioned embodiments.

[0140] The standby SMS modem 200 is in communication connection with the local SMS modem 100 .

[0141] The mobile base station 300 is in communication connection with the local SMS modem 100 .

[0142] The communication provider server 400 is connected to the local SMS modem 100 for communication.

[0143] The engineer's mobile terminal 500 is in communication connection with the local SMS modem 100 .

[0144] The present application relates to a short message modem communication system, in which a local short message modem 100 sends a network access request through a wireless module, and can communicate and network with a standby short message modem 200, a mobile base station 300, a communication service provider server 400, and an engineer's mobile terminal 500, thereby realizing highly portable communication capabilities for engineers. Since the local short message modem can use a 485 communication port or / and an Ethernet communication port to receive data texts from field equipment, engineers can use the short message modem to send the collected data from field equipment, which greatly improves the communication capabilities of engineers, is conducive to the communication and exchange capabilities of specific professional data between engineers, and improves the efficiency of engineers in handling emergencies of field equipment on site. More specifically, through the processing of data texts from field equipment, the local short message modem can convert data texts into short messages or long messages, and split long messages to achieve high-speed transmission of field information.

[0145] The technical features of the above-described embodiments can be combined arbitrarily, and the execution order of each method step is not limited. In order to make the description concise, all possible combinations of the technical features in the above-described embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification. The above-described embodiments only express several implementation methods of the present application, and the description is relatively specific and detailed, but it cannot be understood as a limitation on the scope of the patent of this application. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present application, several deformations and improvements can be made, which all belong to the scope of protection of the present application. Therefore, the scope of protection of the present application shall be based on the attached claims.

Claims

1. A SMS cat communication method, characterized in that: The method comprises: Sending a network access request to the communication provider server based on the wireless module; After the communication provider server responds to the network access request with the result of approving the network access, a communication link is established with the communication provider server; Utilize 485 communication port and / or Ethernet communication port to receive data text sent by field equipment; Determine whether the data volume of the received data text matches the data volume of the short message; If the data volume of the received data text matches the data volume of the short message, the data text is compiled into a short message; If the data volume of the received data text does not match the data volume of the short message, the data text is compiled into a long message; Determine whether the text type after data text compilation is a long message; If the text type after the data text is compiled is a long message, the long message is disassembled into multiple short messages, and all the short messages are transmitted through the communication link; If the text type after the data text is compiled is a short message, all short messages are transmitted through the communication link.

2. The SMS cat communication method according to claim 1, characterized in that: After sending the network access request to the communication provider server based on the wireless module and before establishing the communication link with the communication provider server, the method further includes: receiving a network access request sent by at least one standby SMS modem; Select a network access request; Parsing the device information of the backup SMS modem in the network access request; Establishing a communication network connection relationship with the standby SMS modem; Return to selecting a network access request until all network access requests are completed.

3. The SMS cat communication method according to claim 2, characterized in that: After sending the network access request to the communication provider server based on the wireless module and before establishing the communication link with the communication provider server, the method further includes: Receive information from the engineer's mobile terminal; Requesting the database of the communication operator's server to call the filing information of the mobile terminal in the database; After verifying that the information of the mobile terminal of the engineer matches the registered information of the mobile terminal in the database, the local SMS modem is connected to the local mobile base station based on the wireless module; The information of the mobile terminal of the receiving engineer is returned until the information of the mobile terminals of all the receiving engineers is processed.

4. The SMS cat communication method according to claim 3, characterized in that: The establishing of a communication link with a communication provider server includes: Access the scheduling manager through the network element of the air interface; Send the device identification frame of the local SMS modem to the scheduling manager; Receive incoming data packets from the server gateway; Parse incoming data packets; Based on the parsed incoming data packets, a communication link is formed with the server.

5. The SMS cat communication method according to claim 4, characterized in that: The step of determining whether the data volume of the received data text matches the data volume of the short message comprises: Based on the Modbus protocol, parse the received data text; Convert the received data text into readable text; Select a format for short messages; Based on the selected short message format, compile the contents of the readable text in sequence and obtain the number of characters of the readable text; Determine whether the number of characters in the short message matches the number of characters in the readable text; If the number of characters in the short message matches the number of characters in the readable text, determining that the data volume of the received data text matches the data volume of the short message; If the number of characters in the short message does not match the number of characters in the readable text, it is determined that the data volume of the received data text does not match the data volume of the short message.

6. The SMS cat communication method according to claim 5, characterized in that: The step of splitting a long message into multiple short messages includes: Break long messages into multiple data transmission parts; Select a data transfer section; Determine whether the data volume of the data transmission part matches the data volume of the short message; If the data volume of the data transmission part matches the data volume of the short message, returning to the step of selecting a data transmission part until all data transmission parts are selected and completed; If the data volume of the data transmission part does not match the data volume of the short message, splitting the data transmission part into at least two data transmission parts; adding the disassembled at least two data transmission parts into the data transmission part to be selected; Return to selecting a data transmission part until all data transmission parts are selected to be completed.

7. The SMS cat communication method according to claim 6, characterized in that: The step of disassembling the long message into multiple short messages further includes: Based on the transmission protocol format, each data transmission part is given an information header; Select a format for short messages; Compile the information header and the data transmission part corresponding to the information header into a short message; Select a short message; Based on Hamming coding, the accuracy of the short message is determined; Determining whether the accuracy of the short message meets the accuracy standard; If the accuracy of the short message does not meet the accuracy standard, the short message is deleted; Return to the step of selecting a short message until all short messages are selected.

8. The SMS cat communication method according to claim 7, characterized in that: The transmitting of all short messages via the communication link comprises: Accept interactive instructions; Determine the short message sending object in the interactive command; When the short message is sent to the engineer's mobile terminal, the information of the engineer's mobile terminal input by the interaction end is received, and the short message sending task is executed; When the short message is sent to a standby SMS modem, the short message sending task is performed on the standby SMS modem; When the short message is sent to a communication provider server, the communication link is used to execute the task of sending the short message.

9. The SMS cat communication method according to claim 8, characterized in that: After all the short messages are transmitted through the communication link, the method includes: Receive short messages; Based on the information header of the short message, a complete message information is formed; When the message information matches the data text of the field device, the message information is translated and imported into the field device through the 485 communication port and / or the Ethernet communication port; When the message information matches the data text of the engineer's mobile terminal, the message information is sent to the engineer's mobile terminal in sequence; When the message information matches the data text of the standby SMS modem, the message information is sent to the standby SMS modem.

10. A short message cat communication system, characterized in that: include: A local SMS modem, used to execute the SMS modem communication method according to any one of claims 1 to 9; A standby SMS modem, which is communicatively connected with the local SMS modem; A mobile base station, connected to the local SMS modem for communication; A communication provider server, connected to the local SMS modem for communication; The engineer's mobile terminal is connected to the local SMS modem for communication.

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