About the interpretation of the Hart

Abstract: about Hart interpret information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. Highway addressable remote sensor channels open communication protocol, is Rosement companies in the United States in 1985 launched a for field intelligent instrument and communication protocol between the control room equipment. HART devices have relatively low bandwidth, moderate response time. More flow meter manufacturers choose model price quote you are welcome to inquire, the following are details about the interpretation of the Hart. Highway addressable remote sensor channels open communication protocol, is Rosement companies in the United States in 1985 launched a for field intelligent instrument and communication protocol between the control room equipment. HART devices have relatively low bandwidth, moderate response time of communication, after 10 years of development, HART technology has very mature in foreign countries, and has become a global industry standard of intelligent instrument. HART protocol based on Bell202 standard frequency shift keying FSK signal, 4 - in low frequency Superimposed on 20 ma analog signal amplitude is zero. 5 ma two-way digital communication of digital audio signal, the data transfer rate of 1. 2Mbps。 Because of the FSK signal is 0, the average does not affect the size of the analog signal transmitted to the control system, ensure the compatibility with existing simulation system. The main variables in the HART protocol communication and control information by 4 - 20 ma transmission, in the case of need, in addition the measurement, process parameters, equipment configuration, calibration and diagnostic information accessed using HART protocol. HART communication USES is half duplex communication mode, its characteristic is in the existing analog signals to realize digital signal communication on a transmission line, belongs to the simulation system in the process of transition to the digital system transitional product, therefore in the current transition period has strong ability of market competition, rapid development. HART specifies a series of commands, according to the command works. It has three kinds of command, * class called general command, this is all equipment are understood, the command executed; The second type is called command general behavior, functions can be provided at the scene of the many devices ( Though not all) In implementation, such commands include zui commonly used function library field devices; The third kind is called special equipment command in order to work in some special functions in equipment, these commands can be opened for use in the foundation, can for the development of unique to the command of the company. Usually in a field device can be found at the same time there are these three orders. HART is not the real field bus, but the transition from analog to the fieldbus control system is a stepping stone. HART is mixed protocol combined with simulation and data signals to control system performance information. Through the use of HART, the traditional 4 - 20 mA ( Simulation) Signals are used to represent process variables or control output signal. Secondary variables, equipment status, and configuration data in the 4 - 20 mA signal by using HART protocol to transmit data. HART devices directly connected HART adopts unified DDL description language. Field device developer USES the standard language to describe the equipment features, the HART foundation is responsible for the registration and management of these equipment for the equipment described in describe and put them in the dictionary, the main equipment using DDL technology to understand the characteristic parameters of this equipment without having to develop special interface for these devices. But as a result of the mixed signal system, making it difficult to develop a communication interface chip of can satisfy the requirement of the company. HART can use bus power supply, can meet the requirements of intrinsically safe explosion-proof, and can be composed of host handheld programmer and management system as the main equipment of double main equipment system. For an example of practical application: HART/RS232 converter ( Matsushige electronic SM100 - 一) Command parsing step 1: pressure transmitter and HART pressure transmitter/RS232 converter and the connection between the two wire connection diagram according to the directions to connect, and confirm the correct connection. Step 2: open the HART/RS232 converter test software, open the serial port and connect, serial port test, HART/RS232 converter is can normal communication with PC.

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