CN219372599U

CN219372599U - Wireless networking circuit of measurement and control instrument

Info

Publication number: CN219372599U
Application number: CN202223567802.XU
Authority: CN
Inventors: 宋海涛
Original assignee: Shandong Ruichuan Intelligent Technology Co ltd
Current assignee: Shandong Ruichuan Intelligent Technology Co ltd
Priority date: 2022-12-22
Filing date: 2022-12-22
Publication date: 2023-07-18
Anticipated expiration: 2032-12-22

Abstract

The utility model discloses a wireless networking circuit of a measurement and control instrument, which comprises a measurement and control instrument, a gateway and a server, wherein the measurement and control instrument is provided with multiple paths, each path of measurement and control instrument is provided with a wireless module and a measurement and control instrument, the wireless module is connected with a main control CPU, the wireless module adopts a PAN3028 module, the measurement and control instrument is connected with the gateway through the modules of the PAN3028 in a wireless way, and the gateway is connected with the server.

Description

Wireless networking circuit of measurement and control instrument

Technical Field

The utility model relates to the technical field of light driving, in particular to a wireless networking circuit of a measurement and control instrument.

Background

Along with the rapid development of the application field of the internet of things, the LoRa technology is certainly one of the hot technologies. The need for wireless technology has arisen as compared to the complexity and trouble of conventional meter wiring and reading data. Along with the development of the low-power-consumption wide-area connection requirement of the Internet of things, the LoRa technology also brings new opportunities for the wireless solution of the Internet of things of our instrument. Due to the openness of LoRa, a wide variety of business models are developed in market applications.

The existing ammeter communication mode mainly communicates through RS485, ethernet or Profibus. The communication mode needs special line connection, and is high in wiring cost and unfavorable for large-area popularization and use. While the wiring cost can be reduced by means of wireless communication technologies such as 4G, NB and the like, the communication range is only suitable for wireless communication of a base station, and the cost is high, so that the wireless communication system is not suitable for occasions with wide electric meter installation sites.

The loRa communication instrument has the characteristics of wide coverage, low communication cost, high efficiency, real-time transmission and the like, can improve the management standardization of enterprises on meter reading business, solves the problem that the distribution is difficult to manage due to troublesome wiring points.

The traditional networking mode is shown in fig. 1, each measuring and controlling instrument watchband is provided with one or more 485 interfaces, dozens of instruments (generally less than 20 according to the field environment) are connected to one gateway, a plurality of gateways are assembled on a switch through network cables, and then the switch is connected to a background server through optical fibers. But the defects are obvious, the on-site wiring is complex, the fault removal is difficult, the 485 hardware structure determines that the wiring can be carried out only in a manual mode, and the whole network is unstable and even is paralyzed due to the fact that one piece of equipment is damaged. The company consumes a great deal of manpower to deal with the problems each year, resulting in a great deal of after-sales service work.

Aiming at the defect of 485, one improvement scheme is that a can bus is adopted to replace the 485 bus, as shown in fig. 2, the current arm main stream chips are all provided with can interfaces, the measurement and control instrument end on hardware is slightly improved, can bus communication is adopted, and can interfaces are also added on the gateway tube side, so that the new scheme of replacing the 485 bus by a simple can bus is completed, can nodes are developed to have an automatic closing output management function under the condition of serious errors, so that other nodes on the bus cannot be affected in the operation process, the situation that the abnormal state is in the network is ensured, and the bus is in a 'dead lock' state due to the fact that the problems occur among individual nodes is ensured. Thus, the reliability of the system is improved, and the after-sales service workload is reduced.

In the transformation process of some old projects, original line equipment is aged, lines need to be paved again when networking is needed, and the re-paving is not allowed on some sites, so that wireless communication networking becomes the only choice. In the early period, only 433M GPRS Bluetooth and the like can be selected due to technical limitation, 433M Bluetooth and the like have no use fee, but the transmission distance is short, the number of devices in one gateway is limited, the GPRS networking is simple, but the traffic fee exists, and signals are poor in some basement occasions and the like. In recent years, the LORA technology becomes the main stream of the remote wireless networking, and the biggest characteristic of the LORA technology is that the distance of the LORA technology is farther than the propagation distance of other wireless modes under the same power consumption condition, so that the low power consumption and the long distance are unified, and the distance of the LORA technology is enlarged by 3-5 times compared with the traditional wireless radio frequency communication distance under the same power consumption. A large capacity, one LoRa gateway can connect thousands of LoRa nodes so that one distribution room can be used with one gateway when applied. The debugging difficulty is reduced.

LORA, while a suitable remote wireless networking solution, is a major trend in localization due to the united states' chip sanctions. Fortunately, there are also alternative chips in China, such as Shanghai PAN-open PAN3028, and although the performance LORA chip is slightly bad, the wireless networking scheme of the measurement and control instrument can be completely satisfied.

Disclosure of Invention

The utility model aims to provide a wireless networking circuit of a measurement and control instrument, which aims to solve the problems in the background technology.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

the utility model provides a measurement and control instrument wireless networking circuit, includes measurement and control instrument, gateway and server, measurement and control instrument has the multichannel, all is equipped with a wireless module and measurement and control instrument on each way measurement and control instrument, and wireless module is connected with main control CPU, and this wireless module adopts PAN3028 module, and measurement and control instrument is through all connecting the gateway through PAN 3028's module wireless, and the gateway is connected with the server.

As a further technical scheme of the utility model: and the communication between the measurement and control instrument and the gateway is 470M.

As a further technical scheme of the utility model: the PAN3028 module is connected with the main control CPU in an SPI mode.

As a further technical scheme of the utility model: the gateway and the server are connected through a network or optical fibers.

As a further technical scheme of the utility model: and a DTM-CC001D is welded on the module and the gateway of the PAN 3028.

Compared with the prior art, the utility model has the beneficial effects that: according to the utility model, the CRCT measurement and control instrument is adopted, so that the card selling workload is reduced, the state of the charging pile of the user can be monitored at any time, and the after-sale workload is greatly reduced.

Drawings

Fig. 1 is a schematic diagram of networking using 485.

Fig. 2 is a schematic diagram of networking using CAN.

Fig. 3 is a schematic diagram of networking using a LORA.

Fig. 4 is a schematic diagram of the operation of the present utility model.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 4, a wireless networking circuit of a measurement and control instrument is composed of measurement and control instruments, a gateway and a server, wherein the measurement and control instruments are provided with multiple paths, each measurement and control instrument is welded with a module of PAN3028, a DTM-CC001D is connected with a main control CPU in an SPI mode, and the gateway is also welded with a DTM-CC001D. The communication between the meter and the gateway is 470M.

The biggest difficulty of wireless networking is to solve the problem of sending collision, if a modbus protocol is adopted, a gateway is used as a host, and all measurement and control instruments are polled, if the number is small, the number is large, the polling is carried out for a circle for a few minutes, and if the measurement and control instruments are in fault in the middle, the system is easy to generate a false death condition. Therefore, the CRCT measurement and control instrument adopts an active uploading mode, and the gateway broadcasts and transmits a time setting command at the initial time of power-on, and a real-time clock chip and a battery are arranged in each measurement and control instrument, and synchronize own time after receiving the command, so that the system is consistent. And the latter gateway sends a time synchronization command according to the receivable server command. In order to avoid transmission collision, an address and delay mode is adopted, the address of each measurement and control instrument is set to 16 bits, the high 8 bits correspond to seconds, the low 8 bits correspond to 100 milliseconds, if a certain measurement and control instrument is required to transmit in the second 100 milliseconds of the 5 th second, the address is simply set to 0502, a period timer of 5.2 seconds is set in the measurement and control instrument, and the transmission is circularly carried out, so that the transmission period can be flexibly set according to the number and the transmission distance of the field instruments.

The design scheme of the utility model is flexible and reliable, can meet the design requirement and achieves the satisfaction of users.

It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.

Claims

1. The utility model provides a measurement and control instrument wireless networking circuit, includes measurement and control instrument, gateway and server, its characterized in that, measurement and control instrument has the multichannel, all is equipped with a wireless module and measurement and control instrument on each way measurement and control instrument, and wireless module is connected with main control CPU, and this wireless module adopts PAN3028 module, and measurement and control instrument is through the module wireless connection gateway through PAN3028, and the gateway is connected with the server.

2. The wireless networking circuit of the measurement and control instrument according to claim 1, wherein the communication between the measurement and control instrument and the gateway is 470M.

3. The wireless networking circuit of the measurement and control instrument according to claim 1, wherein the PAN3028 module is connected with the main control CPU in an SPI mode.

4. The wireless networking circuit of the measurement and control instrument according to claim 1, wherein the gateway and the server are connected through a network or an optical fiber.

5. The wireless networking circuit of the measurement and control instrument of claim 1, wherein DTM-CC001D is welded on a module and a gateway of the PAN 3028.