CN111371827A - Data transmission method, device and computer readable storage medium - Google Patents
Data transmission method, device and computer readable storage medium Download PDFInfo
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- H—ELECTRICITY
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- H04L67/00—Network arrangements or protocols for supporting network services or applications
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- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
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- H04W4/80—Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
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Abstract
The invention discloses a data transmission method, which comprises the following steps: when a first data message sent by an LoRa module is received, the central processing unit determines a first sending module corresponding to the first data message; and the central processing unit processes the first data message based on the data format corresponding to the first sending module, and sends the processed first data message to the first sending module, so that the first sending module sends the processed first data message to a terminal node in communication connection with the first sending module. The invention also discloses a data transmission device and a computer readable storage medium. The invention realizes the data transmission of the field equipment in communication connection with the LoRa module to the terminal node in communication connection with the industrial Ethernet module or the field bus module, and further realizes the data transmission with long distance and low power consumption through the LoRa module due to the long transmission distance of the LoRa technology.
Description
Technical Field
The present invention relates to the field of network technologies, and in particular, to a data transmission method, an apparatus, and a computer-readable storage medium.
Background
Electrical automation equipment is widely used in industrial processes. There are a large number of electrical automation devices, instruments and systems in many industrial sites, manufacturing plants, automated logistics plants, transportation vehicle service facilities. These electrical devices are typically distributed throughout the plant in various bays, with spacings ranging from hundreds to thousands of meters. To ensure the safety of the industrial process, the operating state of the electrical automation devices is usually monitored.
The development of industrial ethernet technology has led to its extensive use in the monitoring of the status of electrical automation devices. The electrical equipment state monitoring system generally adopts industrial Ethernet to transmit monitoring data to a data server. However, industrial ethernet requires network cables to be deployed, and for a newly-built factory building and newly-built electric automation equipment, the network cables are generally deployed. However, for existing equipment, a network cable is not usually deployed, and if the network cable is newly deployed, the network cable cannot be deployed or is very expensive.
Moreover, because of the positions of the plants and the distances from the control center to the electric automation equipment in some industrial fields, the cost for deploying the network cable is too high or the electric automation equipment cannot be deployed due to the limitation of physical conditions; sometimes, a power socket is not reserved during installation of the electric automation equipment, and the later period cannot be built or the building cost is too high due to position reasons. There are some real needs such as a large number of electrical devices to be detected in the area. At the moment, the electric automation equipment is monitored by adopting a wireless communication mode powered by a battery. The wireless communication mode needs to meet the requirement of long distance, and meanwhile, the power consumption is low, so that the wireless communication mode is suitable for battery power supply.
Wireless communication is a way of communicating only with electromagnetic waves without cables, and has the greatest advantage of not requiring cables. Wireless communications include wide area wireless (wireless) communication systems, such as GSM, 3G, 4G, GPRS; local wireless (wireless local) systems, such as WiFi; personal wireless (wireless personal) systems such as bluetooth (IEEE802.15.1), ultra wideband UWB (IEEE 802.15.3a), ZigBee (IEEE 802.15.4), and the like. Among these communication technologies, the wide area wireless system has a long communication distance but requires communication costs; the communication equipment of the local area network also needs more investment, and the communication distance is hundreds of meters; the wireless personal area system communication distance is several tens of meters.
If a commonly used wireless communication system is adopted, for example, communication modules such as GSM/GPRS and 4G are adopted, the transmission distance meets the requirement, but equipment investment cost and later-stage operation cost exist, and when more electrical equipment needs to be monitored, the later-stage operation cost is greatly increased; reliable connection cannot be guaranteed by using WiFi communication; if the alternating current power supply is unavailable, the current required by communication is large, and the service life of the battery is short.
In view of the above problems of the wireless communication system, it is difficult to implement remote and low power consumption transmission of monitoring data in a device monitoring manner of wireless communication, and further difficult to implement remote and low power consumption data monitoring.
The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.
Disclosure of Invention
The invention mainly aims to provide a data transmission method, a data transmission device and a computer readable storage medium, and aims to solve the technical problem that the existing wireless communication equipment monitoring mode is difficult to realize data transmission with long distance and low power consumption.
In order to achieve the above object, a data transmission method provided by the present invention is applied to a gateway, where the gateway includes: the system comprises a central processing unit, an industrial Ethernet module, a LoRa module and a field bus module; the central processing unit is respectively in communication connection with the industrial Ethernet module, the LoRa module and the field bus module; the data transmission method comprises the following steps:
when a first data message sent by a LoRa module is received, the central processing unit determines a first sending module corresponding to the first data message, wherein the first sending module is the industrial Ethernet module or a field bus module;
and the central processing unit processes the first data message based on the data format corresponding to the first sending module, and sends the processed first data message to the first sending module, so that the first sending module sends the processed first data message to a terminal node in communication connection with the first sending module.
Further, the data transmission method further includes:
when a second data message sent by an industrial Ethernet module or a field bus module is received, the central processing unit determines a second sending module corresponding to the second data message;
when the second sending module is the LoRa module, the central processing unit processes the second data message based on the data format corresponding to the LoRa module, and sends the processed second data message to the LoRa module, so that the LoRa module sends the processed second data message to a terminal node in communication connection with the LoRa module.
Further, after the step of determining, by the central processing unit, the data type of the second data packet and the second sending module corresponding to the second data packet, the data transmission method further includes:
when an industrial Ethernet module sends a second data message and the second sending module is the field bus module, the central processing unit processes the second data message based on the data format corresponding to the field bus module and sends the processed second data message to the field bus module; alternatively, the first and second electrodes may be,
and when the field bus module sends a second data message and the second sending module is the industrial Ethernet module, the central processing unit processes the second data message based on the data format corresponding to the industrial Ethernet module and sends the processed second data message to the industrial Ethernet module.
Further, the step of sending the processed first data packet to the first sending module, so that the first sending module sends the processed first data packet to a terminal node in communication connection with the first sending module, includes:
the central processing unit acquires a baud rate corresponding to the first data message;
the central processing unit sets the communication baud rate of the first sending module based on the baud rate;
and the central processing unit sends the processed first data message to the first sending module so that the first sending module sends the processed first data message to a terminal node in communication connection with the first sending module based on the baud rate.
Further, the step of the central processing unit obtaining the first baud rate corresponding to the first data packet includes:
the central processing unit traverses a preset baud rate and determines whether the currently traversed preset baud rate is matched with the first data message, wherein if the currently traversed preset baud rate is matched with the first data message, the currently traversed preset baud rate is used as the baud rate; alternatively, the first and second electrodes may be,
the central processing unit acquires communication baud rates corresponding to standard test frames, calculates differences between each standard baud rate and the communication baud rates, and takes the standard baud rate corresponding to the minimum difference in the differences as the baud rate.
Further, after the step of sending the processed first data packet to the first sending module, the data transmission method further includes:
when the first data message is sent, the central processing unit acquires network access node information corresponding to the first sending module;
the central processing unit determines whether a dropped node exists in the network access nodes corresponding to the first sending module based on the network access node information;
if the gateway does not exist, the central processing unit adjusts the working mode of the gateway to be the gateway working mode;
if the gateway exists, the central processing unit deletes the dropped node in the node address list corresponding to the gateway based on the dropped data frame, and adjusts the working mode of the gateway to the gateway working mode.
Further, before the step of determining, by the central processing unit, the first sending module corresponding to the first data packet when the first data packet sent by the LoRa module is received, the data transmission method further includes:
when a data transmission request of a terminal node corresponding to the LoRa module is detected, if the working mode of the gateway is a node active mode, the LoRa module searches a lead code of an LoRa channel corresponding to the data transmission request;
the LoRa module opens a receiving channel corresponding to the lead code and receives the first data message through the receiving channel;
and when the first data message is received, sending the first data message to the central processing unit, and closing the receiving channel.
Further, before the step of determining, by the central processing unit, the first sending module corresponding to the first data packet when the first data packet sent by the LoRa module is received, the data transmission method further includes:
when a network access request sent by a terminal node in communication connection with the LoRa module is received, the LoRa module acquires node information and configuration parameters of the terminal node;
the LoRa module determines whether the terminal node is a legal node or not based on a node address list and the node information;
if so, the LoRa module allocates an idle address and an appointed channel to the terminal node and determines a node working mode;
the LoRa module sends distribution information to the terminal node, wherein the distribution information comprises an idle address, an appointed channel and a node working mode;
and when receiving confirmation information fed back by the terminal node based on the distribution information, the LoRa module establishes network connection with the terminal node.
In addition, to achieve the above object, the present invention also provides a data transmission device, including: the data transmission method comprises a memory, a processor and a data transmission program which is stored on the memory and can run on the processor, wherein the data transmission program realizes the steps of the data transmission method when being executed by the processor.
In addition, to achieve the above object, the present invention also provides a computer-readable storage medium having stored thereon a data transmission program, which when executed by a processor, implements the steps of the aforementioned data transmission method
According to the invention, when a first data message sent by an LoRa module is received, the central processing unit determines a first sending module corresponding to the first data message, wherein the first sending module is the industrial Ethernet module or the field bus module, then the central processing unit processes the first data message based on the data format corresponding to the first sending module and sends the processed first data message to the first sending module, so that the first sending module sends the processed first data message to a terminal node in communication connection with the first sending module, and the data of field equipment in communication connection with the LoRa module is transmitted to the terminal node in communication connection with the industrial Ethernet module or the field bus module The low power consumption data transmission, and the LoRa technology adopts the forward error correction coding technology, adds redundancy in the transmission data, can resist the multipath fading, guarantees the reliability of transmission.
Drawings
Fig. 1 is a schematic structural diagram of a data transmission apparatus in an operating environment according to an embodiment of the present invention;
FIG. 2 is a flowchart illustrating a data transmission method according to a first embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a gateway according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of an application of the gateway of the present invention;
fig. 5 is a schematic structural diagram of another embodiment of the gateway of the present invention;
fig. 6 is a schematic structural diagram of a gateway according to another embodiment of the present invention;
FIG. 7 is a diagram illustrating data conversion according to the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a data transmission apparatus in an operating environment according to an embodiment of the present invention.
The data transmission device of the embodiment of the invention is a gateway. As shown in fig. 1, the gateway may include: a processor 1001, such as a CPU, a network interface 1004, a user interface 1003, a memory 1005, a communication bus 1002. Wherein a communication bus 1002 is used to enable connective communication between these components. The user interface 1003 may include a Display screen (Display), an input unit such as a Keyboard (Keyboard), and the optional user interface 1003 may also include a standard wired interface, a wireless interface. The network interface 1004 may optionally include a standard wired interface, a wireless interface (e.g., WI-FI interface). The memory 1005 may be a high-speed RAM memory or a non-volatile memory (e.g., a magnetic disk memory). The memory 1005 may alternatively be a storage device separate from the processor 1001.
Those skilled in the art will appreciate that the data transfer device configuration shown in fig. 1 does not constitute a limitation of the data transfer device and may include more or fewer components than shown, or some components may be combined, or a different arrangement of components.
As shown in fig. 1, a memory 1005, which is a kind of computer storage medium, may include therein an operating system, a network communication module, a user interface module, and a data transmission program.
In the data transmission apparatus shown in fig. 1, the network interface 1004 is mainly used for connecting to a backend server and performing data communication with the backend server; the user interface 1003 is mainly used for connecting a client (user side) and performing data communication with the client; and the processor 1001 may be used to invoke the data transfer program stored in the memory 1005.
In this embodiment, the data transmission apparatus includes: the data transmission method comprises a memory 1005, a processor 1001 and a data transmission program which is stored on the memory 1005 and can run on the processor 1001, wherein when the processor 1001 calls the data transmission program stored in the memory 1005, the operation in each embodiment of the following data transmission method is executed.
Based on the hardware structure of the multifunctional gateway, the data transmission method provided by the invention has various embodiments.
Referring to fig. 2, fig. 2 is a schematic flow chart of a first embodiment of the data transmission method according to the present invention.
The data transmission method is applied to a gateway, and referring to fig. 3 and 4, the gateway includes: the system comprises a central processing unit, an industrial Ethernet module, a LoRa module and a field bus module; the central processing unit is respectively connected with the industrial Ethernet module, the LoRa module and the field bus module in a communication mode.
LoRa (long range) is one of Low Power Wide Area Network (LPWAN) communication technologies, and is a wireless transmission scheme for realizing long-distance, Low power consumption and multi-node networking based on a spread spectrum technology adopted and popularized by Semtech corporation in America.
The industrial ethernet module includes an ethernet controller, isolation and industrial ethernet interface. DB9, a reinforced RJ45, an aviation plug and a terminal are reserved on the industrial Ethernet interface, and a proper mode can be selected according to the actual situation on site. The industrial Ethernet module can realize field application of various industrial Ethernet, including Ethernet/IP and ModBus-IDA, and is compatible with the existing Ethernet for data communication.
The LoRa module comprises a LoRa chip and an antenna interface, and is divided into two parts, wherein one part is a LoRa management channel and is responsible for address allocation of LoRa nodes which are applied for network access and new access by LoRa nodes; and the other part is an LoRa communication channel, and the LoRa node which obtains address allocation sends and receives data through the communication channel. There may be multiple LoRa communication channels, using different frequencies to transmit data. The LoRa module frequency band operation comprises 433, 868, 915MHz and the like. By adopting the forward error correction coding technology, redundancy is added in the transmission data, the multi-path fading can be resisted, and the reliability of transmission is ensured.
The LoRa module can realize data transmission capability with a longer distance than that of the existing wireless modes such as WiFi, ZigBee and the like; the node adopting the LoRa module can realize the communication distance from hundreds of meters to thousands of meters, and can better combine with the industrial Ethernet to process a large amount of data of the industrial field in time; compared with the existing commercial power supply modules such as GSM, GPRS, 3G, 4G communication modules, WiFi communication modules and the like, the power consumption of the LoRa module is low, so that the power consumption is suitable for occasions powered by batteries (for example, if the power is supplied by a battery with 3000mAh, the power can be used for 5-10 years); an STM low-power-consumption controller is adopted for the LoRa node, the LoRaWAN protocol can automatically adjust the transmitting power according to the communication distance, and meanwhile the sleep mode of the controller can reduce the sleep current to 10 uA; compared with the existing RTU equipment, the development cost is low; LoRa runs in ISM frequency channel, and no communication cost, operation cost are low.
The fieldbus module and the field monitoring device are of the same bus type and comprise a bus controller, a bus driver and an interface. The field bus module CAN be a controller area network CAN, RS485 or the field bus type set according to requirements.
The gateway further comprises: the USB interface comprises a power supply module, a USB module and a storage module; the USB module comprises a USB chip and an interface and is used for debugging the gateway.
The storage module mainly comprises a memory and a storage controller, wherein the central processing unit temporarily stores the acquired data, the data processing result or the data which cannot be processed in time in the cache into the memory; the memory control controls the storing and clearing of memory data.
The power module provides power required by work for the gateway. The power module includes two types of interfaces: the battery interface and the alternating current interface are respectively applied to occasions using batteries and alternating current.
Referring to fig. 5, the central processing unit may employ an arm stm32F4 chip, the LoRa module employs an SX1278 chip, the protocol conversion mode is implemented by a mode selection circuit with a 4-channel digital control analog switch chip CD4052B as a core, and the field bus includes two types of buses of RS485 and CAN.
The LoRa module adopts three groups of SX1278 chips, one group of chips is a management channel chip, the other two groups of chips are communication channels, the center frequencies of the two communication channels are different, and the data of two groups of different LoRa nodes can be received. The industrial Ethernet module adopts a DM9000 chip, an additional isolation transformer and an interface, and is specifically realized by simplifying the traditional TCP/IP on the premise of not violating the protocol standard, meeting the resource limitation of an embedded chip and the requirements of industrial Ethernet transmission, and having the characteristics of real-time property, simplicity and flexibility. The industrial ethernet interface module employs a ruggedized RJ45, aviation plug, DB9, or terminal interface.
Referring to fig. 6, fig. 6 is a schematic diagram of an implementation of the industrial ethernet Etherhet/IP and the long-distance low-power-consumption LoRa implemented by using the DSP, and a conversion gateway of the fieldbus RS485 and the CAN. The characteristic part of Ethernet/IP is that on the basis of Ethernet and TCP/IP technology, the upper layer adopts CIP protocol, so that the high-speed transmission of a large amount of data is easier to realize. TMS320F2812 can also be adopted by the central processing unit, and the central processing unit has faster processing capability. The Ethernet/IP physical layer and the data link layer conform to IEEE802.3 and are realized by adopting a CS8900 chip; the network layer and the transport layer adopt simplified TCP/IP to ensure real-time performance and reliable connection, a Transmission Control Protocol (TCP) is used for transmitting message data, and a connection device protocol (UDP) is used for transmitting I/O data; the application layer adopts common Industrial protocol CIP (common Industrial protocol), is embedded in the software of the DSP, and simultaneously realizes protocol analysis, protocol conversion, gateway setting management and the like.
The data transmission method comprises the following steps:
step S110, when receiving a first data packet sent by an LoRa module, determining, by the central processing unit, a first sending module corresponding to the first data packet, where the first sending module is the industrial ethernet module or a field bus module;
referring to fig. 7, in this embodiment, when the field device corresponding to the LoRa module sends data, the field device sends an LoRa test signal through the LoRa unit, the central processing unit receives the test signal through the LoRa module, masks an identifier of the test signal, determines a baud rate of the data sent by the field device based on the test signal after the identifier is masked, and then sends confirmation information to the field device, so that the field device sends a first data packet to the LoRa module, and the LoRa module forwards the received data packet to the central processing unit.
When receiving a first data packet sent by a LoRa module, the central processing unit determines a first sending module corresponding to the first data packet, specifically, the first sending module is a module in the gateway that sends the first data packet to a target field device.
When receiving a first data message sent by the LoRa module, the central processing unit may determine that the first data message is LoRa data through the frame identifier of the first data message.
Step S120, the central processing unit processes the first data packet based on the data format corresponding to the first sending module, and sends the processed first data packet to the first sending module, so that the first sending module sends the processed first data packet to a terminal node in communication connection with the first sending module.
In this embodiment, when the first sending module is determined, the central processing unit processes the first data packet based on the data format corresponding to the first sending module, when the first sending module is an industrial ethernet module, the first data packet is unpacked or packaged and converted into an industrial ethernet valid frame, and when the first sending module is a fieldbus module, the first data packet is unpacked or packaged and converted into a fieldbus valid frame. And sending the processed first data message to the first sending module so that the first sending module can send the processed first data message to a terminal node (target field device) in communication connection with the first sending module. It should be noted that, when the first data packet is processed, information such as a gateway ID number and a timestamp may also be added to the first data packet.
It should be noted that, when the processed first data packet is obtained, it is determined whether the industrial ethernet module or the fieldbus module is normal, and if not, the processed first data packet is stored in the storage unit and then returned to the gateway operating mode entry; and if the data packet is normal, the processed first data packet is sent to the first sending module.
In the data transmission method provided in this embodiment, when receiving a first data packet sent by an LoRa module, the central processing unit determines a first sending module corresponding to the first data packet, where the first sending module is the industrial ethernet module or the fieldbus module, and then the central processing unit processes the first data packet based on a data format corresponding to the first sending module and sends the processed first data packet to the first sending module, so that the first sending module sends the processed first data packet to a terminal node in communication connection with the first sending module, and thus data of a field device in communication connection with the LoRa module is transmitted to the terminal node in communication connection with the industrial ethernet module or the fieldbus module, because the transmission distance of the LoRa technology is long, and then realize the data transmission of long distance, low-power consumption through loRa module to loRa technique adopts forward error correction coding technique, adds redundancy in the transmission data, can resist the multipath fading, guarantees the reliability of transmission.
Based on the first embodiment, a second embodiment of the data transmission method of the present invention is provided, in this embodiment, the data transmission method further includes:
step S130, when receiving a second data message sent by an industrial Ethernet module or a field bus module, the central processing unit determines a second sending module corresponding to the second data message;
step S140, when the second sending module is the LoRa module, the central processing unit processes the second data packet based on the data format corresponding to the LoRa module, and sends the processed second data packet to the LoRa module, so that the LoRa module sends the processed second data packet to a terminal node in communication connection with the LoRa module.
In this embodiment, when the field device corresponding to the industrial ethernet module or the fieldbus module sends data, the field device sends a test signal to the industrial ethernet module or the fieldbus module, the central processing unit receives the test signal through the industrial ethernet module or the fieldbus module, shields an identifier of the test signal, determines a baud rate of the data sent by the field device based on the test signal after shielding the identifier, and then sends a confirmation message to the field device, so that the field device sends a second data message to the industrial ethernet module or the fieldbus module.
When receiving a second data packet sent by an industrial ethernet module or a fieldbus module, the central processing unit determines a second sending module corresponding to the second data packet, specifically, the second sending module is a module in the gateway that sends the second data packet to a target field device, in this embodiment, the second sending module is a LoRa module, the second data packet carries a destination address (an address of the target field device), and the central processing unit determines that the second sending module is the LoRa module according to the destination address. When the second data packet is processed, information such as a gateway ID number and a timestamp may be added to the second data packet.
When the second sending module is determined to be the LoRa module, the central processing unit processes the second data message based on the data format corresponding to the LoRa module, that is, unpacks or packages the second data message, and converts the second data message into an LoRa valid frame. And sending the processed second data message to the LoRa module so that the LoRa module can send the processed second data message to a terminal node (target field device) in communication connection with the LoRa module.
It should be noted that, when the processed second data packet is obtained, it is determined whether the LoRa module is normal, if not, the processed second data packet is stored in the storage unit, and then the gateway operation mode is returned; and if the data packet is normal, sending the processed second data packet to the LoRa module.
Further, in an embodiment, the data transmission method further includes:
when an industrial Ethernet module sends a second data message and the second sending module is the field bus module, the central processing unit processes the second data message based on the data format corresponding to the field bus module and sends the processed second data message to the field bus module; alternatively, the first and second electrodes may be,
and when the field bus module sends a second data message and the second sending module is the industrial Ethernet module, the central processing unit processes the second data message based on the data format corresponding to the industrial Ethernet module and sends the processed second data message to the industrial Ethernet module.
Data transmission among the field devices in communication connection with the industrial ethernet module, the LoRa module and the fieldbus module is achieved by transmitting data of the field devices in communication connection with the industrial ethernet module to the terminal node in communication connection with the fieldbus module, or transmitting data of the field devices in communication connection with the fieldbus module to the terminal node in communication connection with the industrial ethernet module.
In the data transmission method provided by this embodiment, when receiving a second data packet sent by an industrial ethernet module or a fieldbus module, the central processing unit determines a second sending module corresponding to the second data packet; then, when the second sending module is the LoRa module, the central processing unit processes the second data message based on a data format corresponding to the LoRa module, and sends the processed second data message to the LoRa module, so that the LoRa module sends the processed second data message to a terminal node in communication connection with the LoRa module; the data transmission of the field device in communication connection with the industrial Ethernet module or the field bus module is realized to the terminal node in communication connection with the LoRa module, and the long transmission distance of the LoRa technology is long, so that the long-distance and low-power-consumption data transmission is realized through the LoRa module, and the LoRa technology adopts a forward error correction coding technology, adds redundancy in transmission data, can resist multipath fading, and ensures the reliability of transmission.
Based on the first embodiment, a third embodiment of the data transmission method of the present invention is proposed, in this embodiment, step S110 includes:
step S111, the central processing unit obtains the baud rate corresponding to the first data message;
step S112, the central processing unit sets the communication baud rate of the first sending module based on the baud rate;
step S113, the central processing unit sends the processed first data packet to the first sending module, so that the first sending module sends the processed first data packet to a terminal node in communication connection with the first sending module based on the baud rate.
In this embodiment, when receiving a first data packet sent by the LoRa module, the central processing unit obtains a baud rate corresponding to the first data packet, and specifically, the central processing unit masks an identifier of a test signal in the first data packet, and determines the baud rate of data sent by the field device (the baud rate corresponding to the first data packet) based on the test signal after the identifier is masked.
Then, the central processing unit sets the communication baud rate of the first sending module based on the baud rate, so that the LoRa module and the first sending module have the same communication baud rate, and the central processing unit sends the processed first data message to the first sending module so that the first sending module sends the processed first data message to a terminal node in communication connection with the first sending module based on the baud rate.
Further, in an embodiment, the step S111 includes:
the central processing unit traverses a preset baud rate and determines whether the currently traversed preset baud rate is matched with the first data message, wherein if the currently traversed preset baud rate is matched with the first data message, the currently traversed preset baud rate is used as the baud rate; alternatively, the first and second electrodes may be,
the central processing unit acquires communication baud rates corresponding to standard test frames, calculates differences between each standard baud rate and the communication baud rates, and takes the standard baud rate corresponding to the minimum difference in the differences as the baud rate.
In this embodiment, the baud rate may be determined by a polling method, that is, the central processing unit traverses a preset baud rate, determines whether the currently traversed preset baud rate matches the first data packet, and if so, takes the currently traversed preset baud rate as the baud rate. Or, determining the baud rate by a bit rate estimation method, specifically, calculating the average occupied time of each bit by capturing the pulse number and timing between the start bit and the stop bit of the standard test frame, further obtaining the communication baud rate corresponding to the standard test frame, calculating the difference between each standard baud rate and the communication baud rate, and taking the standard baud rate corresponding to the minimum difference in the differences as the baud rate, wherein the standard baud rate includes 110, 300, 1000, 1200, 2400, 4800, 9600, 19200 baud and the like.
In the data transmission method provided in this embodiment, the central processing unit obtains a first baud rate corresponding to the first data packet; then the central processing unit sets the communication baud rate of the first sending module based on the baud rate; and then the central processing unit sends the processed first data message to the first sending module so that the first sending module sends the processed first data message to a terminal node in communication connection with the first sending module based on the first baud rate, and the accurate transmission of the processed first data message is ensured by setting the communication baud rate of the first sending module, so that the reliability of data transmission is improved.
Based on the first embodiment, a fourth embodiment of the data transmission method of the present invention is proposed, in this embodiment, after step S120, the data transmission method further includes:
step S150, when the first data message is sent, the central processing unit acquires network access node information corresponding to the first sending module;
step S160, the central processing unit determines whether a dropped node exists in the network access nodes corresponding to the first sending module based on the network access node information;
step S170, if not, the central processing unit adjusts the working mode of the gateway to the gateway working mode;
and step S180, if the gateway exists, the central processing unit deletes the dropped node in the node address list corresponding to the gateway based on the dropped data frame, and adjusts the working mode of the gateway to the gateway working mode.
In this embodiment, when the first data packet is sent, the central processing unit obtains network access node information corresponding to the first sending module, and the central processing unit determines whether a dropped node exists in the network access node corresponding to the first sending module based on the network access node information, that is, determines whether a dropped node exists according to comparison between the network access node information and network access node information before the first data packet is sent, and if not, the central processing unit adjusts the working mode of the gateway to the gateway working mode; if the gateway exists, the central processing unit deletes the dropped node in the node address list corresponding to the gateway based on the dropped data frame, and adjusts the working mode of the gateway to the gateway working mode.
In the data transmission method provided in this embodiment, when the first data packet is sent, the central processing unit obtains network access node information corresponding to the first sending module; then the central processing unit determines whether a dropped node exists in the network access nodes corresponding to the first sending module based on the network access node information; if the gateway does not exist, the central processing unit adjusts the working mode of the gateway into a gateway working mode; and if the data frame exists, the central processing unit deletes the offline node in a node address list corresponding to the gateway based on the offline data frame, and adjusts the working mode of the gateway to a gateway working mode, so that the gateway can be ensured to enter the gateway working mode in time, and other field devices are ensured to carry out data transmission.
Based on the first embodiment, a fifth embodiment of the data transmission method of the present invention is provided, in this embodiment, before step S110, the data transmission method further includes:
step S190, when detecting a data transmission request of a terminal node corresponding to the LoRa module, if the working mode of the gateway is the node active mode, the LoRa module searches for a preamble of an LoRa channel corresponding to the data transmission request;
step S200, the LoRa module opens a receiving channel corresponding to the lead code and receives the first data message through the receiving channel;
step S210, when the first data packet is received, sending the first data packet to the central processing unit, and closing the receiving channel.
In this embodiment, referring to fig. 7, when detecting a data transmission request of a terminal node corresponding to the LoRa module, if the operating mode of the gateway is the node active mode, the LoRa module searches for a preamble of an LoRa channel corresponding to the data transmission request. If the working mode of the gateway is the gateway query mode, the address and the polling attribute of the polling node are written in the query instruction, the polling instruction is sent, the working mode is switched to the working mode the same as the active mode of the node, and then the LoRa module searches the lead code of the LoRa channel corresponding to the data transmission request.
In the data transmission method provided in this embodiment, when a data transmission request of a terminal node corresponding to the LoRa module is detected, if a working mode of the gateway is a node active mode, the LoRa module searches for a preamble of an LoRa channel corresponding to the data transmission request; then the LoRa module opens a receiving channel corresponding to the lead code and receives the first data message through the receiving channel; and then when the first data message is received, the first data message is sent to the central processing unit, the receiving channel is closed, and the receiving channel corresponding to the lead code is opened, so that the first data message can be stably and reliably received, and the reliability of data transmission through a gateway is improved.
Based on the foregoing embodiment, a sixth embodiment of the data transmission method of the present invention is provided, in this embodiment, before step S110, the data transmission method further includes:
step S220, when receiving a network access request sent by a terminal node in communication connection with the LoRa module, the LoRa module acquires node information and configuration parameters of the terminal node;
step S230, the LoRa module determines whether the terminal node is a legal node or not based on the node address list and the node information;
step S240, if yes, the LoRa module allocates an idle address to the terminal node, assigns a channel and determines a node working mode;
step S240, the LoRa module sends distribution information to the terminal node, wherein the distribution information comprises an idle address, a designated channel and a node working mode;
step S250, when receiving the confirmation information fed back by the terminal node based on the allocation information, the LoRa module establishes network connection with the terminal node.
In this embodiment, when the gateway starts to operate, the register of the LoRa module is initialized first. And then waiting for whether a network access request is sent by an LoRa module in the wireless monitoring device on site. If not, continuing to wait; if the network access request exists, when the network access request sent by a terminal node in communication connection with the loRa module is received, the loRa module obtains node information and configuration parameters of the terminal node, and the loRa module determines whether the terminal node is a legal node or not based on a node address list and the node information.
In the data transmission method provided in this embodiment, when receiving a network access request sent by a terminal node communicatively connected to the LoRa module, the LoRa module obtains node information and configuration parameters of the terminal node; then the LoRa module determines whether the terminal node is a legal node or not based on a node address list and the node information; if yes, the LoRa module allocates an idle address and an appointed channel to the terminal node and determines a node working mode; and then the LoRa module sends distribution information to the terminal node, and finally when confirmation information fed back by the terminal node based on the distribution information is received, the LoRa module establishes network connection with the terminal node to realize network access of the terminal node in communication connection with the LoRa module, so that the gateway has expansibility.
Furthermore, an embodiment of the present invention further provides a computer-readable storage medium, where a data transmission program is stored, and when the data transmission program is executed by a processor, the data transmission program implements the steps of the data transmission method according to any one of the above.
The specific embodiment of the computer-readable storage medium of the present invention is substantially the same as the embodiments of the data transmission method, and is not described in detail herein.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a readable storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
The present invention is described in connection with the accompanying drawings, but the present invention is not limited to the above embodiments, which are only illustrative and not restrictive, and those skilled in the art can make various changes without departing from the spirit and scope of the invention as defined by the appended claims, and all changes that come within the meaning and range of equivalency of the specification and drawings that are obvious from the description and the attached claims are intended to be embraced therein.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A data transmission method applied to a gateway, the gateway comprising: the system comprises a central processing unit, an industrial Ethernet module, a LoRa module and a field bus module; the central processing unit is respectively in communication connection with the industrial Ethernet module, the LoRa module and the field bus module; the data transmission method comprises the following steps:
when a first data message sent by a LoRa module is received, the central processing unit determines a first sending module corresponding to the first data message, wherein the first sending module is the industrial Ethernet module or a field bus module;
and the central processing unit processes the first data message based on the data format corresponding to the first sending module, and sends the processed first data message to the first sending module, so that the first sending module sends the processed first data message to a terminal node in communication connection with the first sending module.
2. The data transmission method of claim 1, wherein the data transmission method further comprises:
when a second data message sent by an industrial Ethernet module or a field bus module is received, the central processing unit determines a second sending module corresponding to the second data message;
when the second sending module is the LoRa module, the central processing unit processes the second data message based on the data format corresponding to the LoRa module, and sends the processed second data message to the LoRa module, so that the LoRa module sends the processed second data message to a terminal node in communication connection with the LoRa module.
3. The data transmission method according to claim 2, wherein after the step of determining, by the central processing unit, the data type of the second data packet and the second sending module corresponding to the second data packet, the data transmission method further comprises:
when an industrial Ethernet module sends a second data message and the second sending module is the field bus module, the central processing unit processes the second data message based on the data format corresponding to the field bus module and sends the processed second data message to the field bus module; alternatively, the first and second electrodes may be,
and when the field bus module sends a second data message and the second sending module is the industrial Ethernet module, the central processing unit processes the second data message based on the data format corresponding to the industrial Ethernet module and sends the processed second data message to the industrial Ethernet module.
4. The data transmission method according to claim 1, wherein the step of sending the processed first data packet to the first sending module, so that the first sending module sends the processed first data packet to a terminal node communicatively connected to the first sending module, includes:
the central processing unit acquires a baud rate corresponding to the first data message;
the central processing unit sets the communication baud rate of the first sending module based on the baud rate;
and the central processing unit sends the processed first data message to the first sending module so that the first sending module sends the processed first data message to a terminal node in communication connection with the first sending module based on the baud rate.
5. The data transmission method according to claim 4, wherein the step of the central processing unit obtaining the first baud rate corresponding to the first data packet comprises:
the central processing unit traverses a preset baud rate and determines whether the currently traversed preset baud rate is matched with the first data message, wherein if the currently traversed preset baud rate is matched with the first data message, the currently traversed preset baud rate is used as the baud rate; alternatively, the first and second electrodes may be,
the central processing unit acquires communication baud rates corresponding to standard test frames, calculates differences between each standard baud rate and the communication baud rates, and takes the standard baud rate corresponding to the minimum difference in the differences as the baud rate.
6. The data transmission method according to claim 1, wherein after the step of sending the processed first data packet to the first sending module, the data transmission method further comprises:
when the first data message is sent, the central processing unit acquires network access node information corresponding to the first sending module;
the central processing unit determines whether a dropped node exists in the network access nodes corresponding to the first sending module based on the network access node information;
if the gateway does not exist, the central processing unit adjusts the working mode of the gateway to be the gateway working mode;
if the gateway exists, the central processing unit deletes the dropped node in the node address list corresponding to the gateway based on the dropped data frame, and adjusts the working mode of the gateway to the gateway working mode.
7. The data transmission method according to claim 1, wherein before the step of determining, by the central processing unit, the first sending module corresponding to the first data packet when receiving the first data packet sent by the LoRa module, the data transmission method further includes:
when a data transmission request of a terminal node corresponding to the LoRa module is detected, if the working mode of the gateway is a node active mode, the LoRa module searches a lead code of an LoRa channel corresponding to the data transmission request;
the LoRa module opens a receiving channel corresponding to the lead code and receives the first data message through the receiving channel;
and when the first data message is received, sending the first data message to the central processing unit, and closing the receiving channel.
8. The data transmission method according to any one of claims 1 to 7, wherein before the step of determining, by the central processing unit, the first sending module corresponding to the first data packet when receiving the first data packet sent by the LoRa module, the data transmission method further includes:
when a network access request sent by a terminal node in communication connection with the LoRa module is received, the LoRa module acquires node information and configuration parameters of the terminal node;
the LoRa module determines whether the terminal node is a legal node or not based on a node address list and the node information;
if so, the LoRa module allocates an idle address and an appointed channel to the terminal node and determines a node working mode;
the LoRa module sends distribution information to the terminal node, wherein the distribution information comprises an idle address, an appointed channel and a node working mode;
and when receiving confirmation information fed back by the terminal node based on the distribution information, the LoRa module establishes network connection with the terminal node.
9. A data transmission apparatus, characterized in that the data transmission apparatus comprises: memory, processor and data transmission program stored on the memory and executable on the processor, which data transmission program, when executed by the processor, implements the steps of the data transmission method according to any one of claims 1 to 6.
10. A computer-readable storage medium, characterized in that a data transmission program is stored thereon, which when executed by a processor implements the steps of the data transmission method according to any one of claims 1 to 6.
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