Networked technical support and market demand for flow meters

Abstract: Networked technical support and market demand information for flowmeters are provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. The networked flowmeter, such as electromagnetic flowmeter, vortex flowmeter, turbine flowmeter, etc., is an instrument suitable for use in long-distance measurement and control, and is the result of the deep integration of instrument measurement and control skills, modern computer skills, network communication skills and microelectronics skills. . network. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the article on networked technical support and market demand for flowmeters. The networked flowmeter, such as electromagnetic flowmeter, vortex flowmeter, turbine flowmeter, etc., is an instrument suitable for use in long-distance measurement and control, and is the result of the deep integration of instrument measurement and control skills, modern computer skills, network communication skills and microelectronics skills. . The networked equipment can not only automatically measure, control, store and display the measurement results and control status of the relevant physical quantities according to the set program like ordinary instruments; at the same time, it has important network application characteristics. Perform functional operation on the instrument, obtain measurement results, monitor the instrument in real time, set parameters and diagnose faults, and control it to dynamically publish information on the Internet. Like computers, they become independent nodes in the network, which can be directly connected to the nearest network communication cable easily, and“Plug and Play”, directly send the field test data to the Internet; users can read the information (including processed data, panel pictures of instruments, etc.) in real time through a reader or a standard application program. The characteristics of networked instruments: The front-end module in the measurement and control system based on the Internet not only completes the collection and control of signals, but also performs overall analysis and transmission of signals, because it is supported by a powerful microprocessor and an embedded operating system. . On this platform, users can easily complete the addition and deletion of various measurement function modules and the selection of different network transmission methods. Secondly, the most significant feature of the measurement and control system based on the Internet is that the method of signal transmission has changed. The transmission of measurement and control signals based on the measurement and control system of the Internet is based on the public Internet. With the front-end embedded module, the safe and efficient transmission of the measurement data of the system becomes possible. In addition, the measurement and control system based on the Internet has greatly improved the expression and output of the measured results. On the one hand, no matter where they are, the user can easily read various real-time data through the client, and understand the current state of the equipment. On the other hand, in the control center of the client, the intelligent software and database system can be called to analyze the measured results and provide help for the user to issue control instructions or make decisions. The method of accessing the Internet or Ethernet: The design method of networked instrumentation is to embed the embedded system into the instrumentation and make it the center of measurement and control. Generally, there are three ways for embedded instruments to connect to the Internet or Ethernet to become network instruments: (1) 32-bit advanced MCUs constitute embedded instruments, because there are sufficient resources to expand the application, and all TCP/IP protocol suites can be implemented in the system Therefore, it can become a network instrument directly connected to the Internet, but it is difficult to develop; (2) For embedded instruments composed of low-level 8-bit machines, use dedicated networks (such as RS-232, RS-485, Profibus, etc. ) Connect a number of embedded instruments to a PC, use the PC as a gateway, and the PC converts the information on the network into TCP/IP protocol data packets and sends them to the Internet to complete information sharing, but it must be specially equipped with a PC to Carry out protocol conversion; (3) An embedded networked instrument directly connected to the Internet is formed by an 8-bit single-chip microcomputer. The advantage of this design is that it can use the previous measurement equipment based on an 8-bit single-chip microcomputer to directly drive the network interface chip through the addition of a network chip. , but takes up a lot of resources (ROM, RAM, CPU), and requires the microcontroller to have a fast running speed. Interface chip supporting the network: The network interface chip uses the RTL8019AS of RELTEK Company. Because of its excellent function and low price, it is an ideal chip for Ethernet communication. (1) The main function conforms to the Ethernet II and IEEE802.3 standards; it is a full-duplex communication interface, and the sending and receiving rate can reach 10Mbps at the same time; the built-in 16K SRAM is used for sending and receiving buffering, reducing the speed request to the main processor; supporting 8/ 16-bit data bus, 8 stop request lines and 16 I/O base address selection; it can complete the construction of physical frames, codec, CRC construction and verification, data transmission and reception, etc. Send and receive data together. (2) Internal structure RTL8019AS can be divided into long-distance DMA interface, local DMA interface, MAC (medium access control) logic, data coding and decoding logic and other ports. The long-distance DMA interface refers to the bus that the single-chip microcomputer reads and writes to the internal RAM of the RTL8019AS, that is, the interface part of the ISA bus. The one-chip computer only needs to operate the long-distance DMA to send and receive data. The local DMA interface is the connection channel between the RTL8019AS and the network cable, which completes the data exchange between the controller and the network cable.

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