CN114710380B - Gateway system based on two-wire Ethernet - Google Patents
Gateway system based on two-wire Ethernet Download PDFInfo
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- CN114710380B CN114710380B CN202210284005.6A CN202210284005A CN114710380B CN 114710380 B CN114710380 B CN 114710380B CN 202210284005 A CN202210284005 A CN 202210284005A CN 114710380 B CN114710380 B CN 114710380B
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Abstract
The invention relates to a gateway system based on a double-line Ethernet, which comprises a double-line Ethernet gateway device, a conventional edge terminal and a double-line Ethernet edge terminal; the double-wire Ethernet gateway device comprises a main control chip, and a double-wire Ethernet PHY module, a conventional Ethernet PHY module, a power module, an SD card module, a serial port module, an RS485 module, a CAN bus module and an MQTT communication module which are respectively connected with the main control chip; one or more two-wire ethernet edge terminals connect the interfaces of the two-wire ethernet PHY module through a single twisted pair; after interface conversion is carried out on one or more conventional edge terminals through the two-wire Ethernet conversion equipment, the one or more conventional edge terminals are connected with an interface of the two-wire Ethernet interface PHY module through a single twisted pair; alternatively, one or more conventional edge terminals directly connect to the interfaces of a conventional ethernet PHY module. Compared with the prior art, the invention has the advantages of simplified field wiring, good compatibility, strong platform expansibility and the like.
Description
Technical Field
The present invention relates to ethernet gateway technology, and in particular, to a gateway system based on a two-wire ethernet.
Background
According to the development trend of the two-wire Ethernet, a large number of two-wire Ethernet remote I/O devices or two-wire Ethernet sensors and other edge terminal devices are inevitably brought into the industrial field in the future. However, due to the cost, performance and time problems, more office computers, switches, routers, gateways and other devices are difficult to update in a short time, and still maintain the conventional ethernet interface design of four twisted pairs. On the other hand, with the requirements of big data and edge computation, it is particularly important that the gateway system can support the performance requirements of multiple platforms at the same time. Thus, there is a need in the marketplace for a multi-platform data forwarding gateway system that can support a two-wire ethernet interface.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a gateway system based on the double-line Ethernet, which supports multi-platform data forwarding of a double-line Ethernet interface, effectively avoids the delay and complexity of acquiring data by different platforms, improves the safety of network communication and enhances the compatibility of the system.
The aim of the invention can be achieved by the following technical scheme:
a dual-line ethernet (SPE, single Pair Ethernet) based gateway system comprising a dual-line ethernet gateway device, a conventional edge terminal, and a dual-line ethernet edge terminal;
the double-wire Ethernet gateway device comprises a main control chip, a double-wire Ethernet PHY module, a conventional Ethernet PHY module, a power module, an SD card module, a serial port module, an RS485 module, a CAN bus module and an MQTT communication module which are respectively connected with the main control chip; the serial port module, the RS485 module, the CAN bus module and the MQTT communication module are respectively connected with the serial port interface platform, the RS485 interface platform, the CAN bus interface platform and the MQTT protocol Internet of things platform;
one or more two-wire ethernet edge terminals connect the interfaces of the two-wire ethernet PHY module through a single twisted pair;
after interface conversion is carried out on one or more conventional edge terminals through the two-wire Ethernet conversion equipment, the one or more conventional edge terminals are connected with an interface of the two-wire Ethernet interface PHY module through a single twisted pair;
alternatively, one or more conventional edge terminals directly connect to interfaces of a conventional ethernet PHY module;
the two-wire Ethernet gateway device acquires data information from a conventional edge terminal and a two-wire Ethernet edge terminal through a Modbus/TCP protocol and then forwards the data information to one or more of a serial port interface platform, an RS485 interface platform, a CAN bus interface platform and an MQTT protocol Internet of things platform.
Further, the two-wire Ethernet PHY module comprises a two-wire Ethernet chip adopting IEEE802.3cg, 10Base-T1L standards.
Further, the main control chip integrates a MAC unit, and the two-wire ethernet PHY module includes an RMII interface and is connected to the MAC unit through the RMII interface.
Further, the conventional ethernet PHY module includes an RMII interface, and the MAC unit is connected through the RMII interface.
Further, the two-wire ethernet gateway device is configured as a Client side of the Modbus/TCP protocol.
Further, the main control chip adopts a cortex-A7 kernel chip.
Further, the SD card module is configured to cooperate with a BOOT startup circuit to enable a gateway system to be started from a network.
Further, the MQTT protocol Internet of things platform is an alicloud Internet of things platform.
Further, the gateway system adopts a Linux operating system.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention designs a brand new gateway system, can support the access of the two-wire Ethernet edge terminal and the sensor equipment which are about to be used in large quantities in the future, and has the advantages of good system compatibility, saving a large number of communication cables and the like.
2. The traditional gateway system generally only supports one-to-one data forwarding, and the gateway system supports a plurality of platform data forwarding and has the advantages of strong platform compatibility and the like.
Drawings
Fig. 1 is a schematic diagram of a gateway system according to the present invention.
Fig. 2 is a schematic diagram of a dual-port design of the gateway system according to the present invention.
Fig. 3 is a schematic diagram of gateway system platform forwarding according to the present invention.
Fig. 4 is a flow chart of gateway system software of the present invention.
Detailed Description
The invention will now be described in detail with reference to the drawings and specific examples. The present embodiment is implemented on the premise of the technical scheme of the present invention, and a detailed implementation manner and a specific operation process are given, but the protection scope of the present invention is not limited to the following examples.
As shown in fig. 1, the present embodiment provides a two-wire ethernet-based gateway system, which includes a two-wire ethernet gateway device, a plurality of conventional edge terminals, and a plurality of two-wire ethernet edge terminals. The two-wire ethernet gateway device may support access by two-wire ethernet edge terminals and conventional edge terminals.
The device comprises a double-wire Ethernet gateway device, a main control chip, a double-wire Ethernet PHY module, a conventional Ethernet PHY module, a power module, an SD card module, a serial port module, an RS485 module, a CAN bus module and an MQTT communication module which are respectively connected with the main control chip. The serial port module, the RS485 module, the CAN bus module and the MQTT communication module are respectively connected with the serial port interface platform, the RS485 interface platform, the CAN bus interface platform and the MQTT protocol Internet of things platform.
All two-wire ethernet edge terminals connect the interfaces of the two-wire ethernet PHY module via a single twisted pair. And part of the conventional edge terminals are connected with the interfaces of the two-wire Ethernet interface PHY module through the single twisted pair after interface conversion by the two-wire Ethernet conversion equipment, and the other conventional edge terminals are directly connected with the interfaces of the conventional Ethernet PHY module.
The two-wire Ethernet gateway device acquires data information from the conventional edge terminal and the two-wire Ethernet edge terminal through Modbus/TCP protocol, and then forwards the data information to one or more of a serial port interface platform, an RS485 interface platform, a CAN bus interface platform and an MQTT protocol Internet of things platform.
The two-wire Ethernet gateway device is used as a Client end of Modbus/TCP protocol, and the edge terminal equipment provided with the sensor, namely a conventional edge terminal and the two-wire Ethernet edge terminal are used as Modbus/TCP protocol Server ends. The Server end can collect sensor data in real time, the Client end is used for establishing connection, and register data are read from the Server end. The two-wire Ethernet gateway device adopts Modbus/TCP protocol to read the data collected by the edge terminal, and caches and forwards the received data.
The dual-line Ethernet gateway device adopts a cortex-A7 kernel chip as a gateway system kernel controller. The Modbus/TCP protocol physical layer communication PHY adopts a two-wire Ethernet technology, realizes the transmission of Modbus/TCP protocol data frames by a single twisted pair, and is compatible with a conventional Ethernet PHY. The seamless switching of the dual-line Ethernet PHY module and the conventional Ethernet PHY module is supported, the PHY module is connected with the main controller by adopting a general RMII interface, and the kernel drive is automatically switched when the PHY module is switched. Edge termination device sensor data supporting a two-wire ethernet interface or a conventional ethernet interface may be received.
The double-wire Ethernet gateway device CAN forward the received sensor data to a platform of a corresponding interface, and the platform supporting forwarding comprises a serial interface platform, a platform of an RS485 interface, a management platform of a CAN bus protocol interface and an Arian Internet of things platform of an MQTT protocol interface, so that multi-platform data docking is realized, and system compatibility is enhanced. The power supply module is powered by a 3.3V power supply. The CAN bus communication interface chip adopts a TJA1050 high-speed CAN bus transceiver developed by NXP company. The RS485 and serial port communication interfaces are designed in a TTL level-to-RS 485 mode and a TTL-to-serial port mode, and the adopted chips are respectively designed as SP3485 chips and SP3232 chips. The MQTT protocol interface and the Modbus/TCP protocol interface share one PHY network communication interface, and a communication module designed by a conventional Ethernet interface PHY chip or a double-wire Ethernet interface PHY chip can be selected according to requirements. The conventional ethernet interface chip adopts a LAN8720A PHY chip design, and the two-wire ethernet chip adopts an SPE PHY chip design newly developed in the market.
The edge terminal collects the sensor data of each channel to the edge terminal and stores the sensor data into a register, and the edge terminal does not actively send the data outwards in an initial state. Because the communication protocol adopts Modbus/TCP protocol, the data provider is generally used as the Server, and the edge terminal equipment for providing data is considered to be used as the Modbus/TCP Server. The gateway data source designed based on the Cortex-A7 kernel main control chip is edge terminal equipment data read through Modbus/TCP protocol, is responsible for obtaining sensor data from terminal equipment, and is designed as a Client terminal. Modbus/TCP has the functions of reading a coil, writing a single coil, writing a plurality of coils, reading discrete quantity input, reading and writing a single or a plurality of input registers, holding registers and the like. The Modbus/TCP gateway equipment based on the two-wire Ethernet is used as a Modbus/TCP protocol client, and corresponding register data are required to be read according to the type of a register and a frame format of data stored by a Server. The Server terminal forwards the read data to a serial port or an RS485 and CAN interface, and CAN be packaged into an MQTT protocol to be transmitted to an Arin cloud platform.
As shown in fig. 2, a schematic diagram of a two-wire ethernet gateway device is provided. The network communication interface is provided with a dual-line Ethernet PHY interface (SPE) and a conventional Ethernet PHY interface, and the two network communication interfaces can be selected according to the type of the edge terminal interface of the access gateway equipment. The two-wire Ethernet PHY interface adopts a single twisted pair wire for receiving the edge terminal data of the two-wire Ethernet interface, and the gateway is compatible with the Ethernet edge terminal equipment of the conventional Ethernet interface. In the two-wire Ethernet gateway device, a conventional Ethernet PHY and a two-wire Ethernet PHY are connected with the MAC of a Cortex-A7 kernel master control chip by adopting an RMII interface. The network communication interface is a physical layer carrier of Modbus/TCP communication protocol, and is an application layer communication mode based on the TCP/IP communication protocol. The implementation of network communication requires two parts, namely PHY and MAC, and the PHY chip mainly decodes external analog electric signals and then sends the signals to the MAC peripheral through the RMII interface. The network communication needs to adopt two different circuit designs according to whether the main control chip integrates the MAC peripheral. If the main control SOC has no integrated MAC peripheral, the MAC peripheral is required to be expanded, a chip integrating the MAC peripheral and the PHY is used, and data is transferred between the main control SOC and a main controller through other communication interfaces such as an SRAM interface or an SPI interface. The gateway equipment is internally integrated with the MAC peripheral, and a network communication chip integrating the MCA and the PHY is not needed, so that the complexity of the circuit design of the network communication part is effectively reduced.
As shown in fig. 3, a forwarding schematic diagram of the dual-wire ethernet gateway device platform is shown. The gateway system software mainly realizes various functions of the gateway, including a data uploading function of receiving edge terminal equipment, a CAN bus interface forwarding function, an MQTT Ali cloud platform data forwarding function, an RS 485/serial port interface forwarding function and the like. Firstly, the edge terminal and the gateway equipment establish connection and upload data. The gateway equipment receives data uploaded by the edge terminal equipment through a Modbus/TCP protocol, and then forwards the data through a Modbus/TCP protocol interface, a CAN bus interface, an MQTT protocol ali cloud Internet of things interface and an RS 485/serial port interface, and the data are respectively accessed into a management platform supporting the Modbus/TCP protocol interface, the CAN bus interface, the ali cloud Internet of things management platform and the RS 485/serial port interface platform.
As shown in fig. 4, a two-wire ethernet gateway device software flow diagram is provided. In this embodiment, a Linux open source operating system is used as a software program, and a new Linux kernel is a system supporting a device tree, so that the system is initialized through the device tree. The gateway device selects Cortex-A7 kernel control chip, the kernel program is driven by a CAN bus, and the CAN bus communication CAN be used by starting a driving program in a system equipment tree. The RS 485/serial port shares an on-chip and off-chip output, the external interface adopts RS485 and SP3232 to perform electric conversion, the driving is self-contained driving of the kernel, and only one can be selected at the same time for communication. The gateway system manually initializes the CAN bus communication frequency, the communication frequency is set according to the CAN bus platform which needs to be accessed, and the frequency of CAN communication in the gateway system and the CAN bus platform to be accessed are set to be the same communication frequency. Then, a gateway program is started, the gateway program belongs to a Modbus/TCP client, and the Modbus/TCP server needs to be connected through an IP address and a port number. When the gateway program is started, the Modbus/TCP server IP and the port number are input through external parameters, and the operations such as data reading and writing can be smoothly performed after the server and the client are successfully connected.
And the initialization program is mainly used for starting Modbus/TCP server program threads and SDK packet interface threads of the Arin cloud platform. ModbusTCPServer_thread_exe and iot _ ali _thread_exe are specific thread initialization programs, and mainly perform tasks such as connection initialization and parameter initialization. The Modbus TCPServer_thread_exe thread mainly realizes the initialization of a server connection program, and special registers such as Modbus/TCP coils and holding registers realize address mapping in a C language mode. The iot _ ali _thread_exe initialization thread mainly realizes the login SDK package initialization, MQTT client initialization, server address and port initialization and triple initialization of the alicloud Internet of things platform. The three-way group of the ali cloud internet of things platform comprises a product_key, a device_name and a device_secret, and is used for connecting the ali cloud internet of things platform certificate with the gateway equipment. The gateway equipment can normally connect with the device equipment corresponding to the alicloud internet of things platform product by configuring correct triplet data, and finally enters a flow of circularly forwarding the data, wherein the data source is local cache data of a Modbus/TCP client terminal receiving service terminal.
After the gateway device Client and the edge terminal Server establish Modbus/TCP communication connection, the gateway device starts a register reading command. The edge terminal is used as a Server end, receives a Client read data request command, packages sensor data into Modbus/TCP protocol, and returns the sensor data to the gateway Client end as response data. The Client receives the sensor data of each channel and caches the original data to the gateway local memory. In order to ensure the real-time performance of data transmission, the data received by the gateway locally is immediately and directly forwarded through the CAN and the RS 485/serial port. Considering the difference of data frame formats among different networks, the data formats of forwarding transmission all adopt channel numbers and data frame formats corresponding to the channel number data one by one for data transmission. After other upper platforms receive the data forwarded by the CAN or the RS 485/serial port, the channel and the sampling data of the corresponding channel CAN be analyzed according to the data frame format.
And after the gateway system and the alicloud internet of things platform are connected, directly reading cache data received by the gateway. And packaging the cache data into an MQTT protocol frame format, and transmitting cloud platform data through an SDK packet and an API interface function downloaded after products and devices are established by the Ali cloud Internet of things platform.
The specific development is as follows:
1) And starting a gateway program, and inputting the IP address and the port number of the Modbus/TCP server through parameters.
2) The two-wire ethernet gateway device allocates data cache register space.
3) And starting Modbus/TCP client threads by adopting a multithreading technology, and starting MQTT Ali cloud Internet of things platform data forwarding threads.
4) The two-wire Ethernet gateway device tries to establish Modbus/TCP connection with the edge terminal equipment, and after the connection is successful, the gateway device reads data and analyzes the data through Modbus/TCP protocol. Meanwhile, the data is forwarded to a CAN interface platform through a CAN interface, is forwarded to an RS485 or serial interface platform through an RS 485/serial port, and is cached to a gateway system register.
5) And (3) the other thread of the two-wire Ethernet gateway system simultaneously starts the MQTT protocol, tries to establish connection with the alicloud Internet of things platform, can read the data cached in the step (4) after the connection is successful, and packages the data into a specified MQTT protocol data frame format for data forwarding to the alicloud Internet of things platform.
The foregoing describes in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the invention by one of ordinary skill in the art without undue burden. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.
Claims (7)
1. A gateway system based on a two-wire Ethernet, which is characterized by comprising a two-wire Ethernet gateway device, a conventional edge terminal and a two-wire Ethernet edge terminal;
the double-wire Ethernet gateway device comprises a main control chip, a double-wire Ethernet PHY module, a conventional Ethernet PHY module, a power module, an SD card module, a serial port module, an RS485 module, a CAN bus module and an MQTT communication module which are respectively connected with the main control chip; the serial port module, the RS485 module, the CAN bus module and the MQTT communication module are respectively connected with the serial port interface platform, the RS485 interface platform, the CAN bus interface platform and the MQTT protocol Internet of things platform;
one or more two-wire ethernet edge terminals connect the interfaces of the two-wire ethernet PHY module through a single twisted pair;
after interface conversion is carried out on one or more conventional edge terminals through the two-wire Ethernet conversion equipment, the one or more conventional edge terminals are connected with an interface of the two-wire Ethernet interface PHY module through a single twisted pair;
alternatively, one or more conventional edge terminals directly connect to interfaces of a conventional ethernet PHY module;
the two-wire Ethernet gateway device acquires data information from a conventional edge terminal and a two-wire Ethernet edge terminal through a Modbus/TCP protocol and then forwards the data information to one or more of a serial port interface platform, an RS485 interface platform, a CAN bus interface platform and an MQTT protocol Internet of things platform.
2. The two-wire ethernet based gateway system of claim 1, wherein said two-wire ethernet PHY module comprises a two-wire ethernet chip employing an ieee802.3cg, 10Base-T1L standard.
3. The two-wire ethernet based gateway system of claim 1, wherein the main control chip has an integrated MAC unit thereon, wherein the two-wire ethernet PHY module includes an RMII interface, and wherein the MAC unit is connected through the RMII interface.
4. A two-wire ethernet based gateway system according to claim 3, wherein said conventional ethernet PHY module comprises a RMII interface and the MAC unit is connected via the RMII interface.
5. The two-wire ethernet based gateway system of claim 1, wherein said two-wire ethernet gateway device is configured as a Client side of a Modbus/TCP protocol.
6. The gateway system based on two-wire ethernet according to claim 1, wherein said main control chip is a cortex-A7 core chip.
7. The two-wire ethernet based gateway system of claim 1, wherein said SD card module is configured to cooperate with a BOOT start circuit to enable a start of the gateway system from a network.
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