The Study Intelligent Pressure Transmitter Based On Hart Protocol

With the world automation technology rapid development and microelectronics technology progress, and the development of field bus technology applied gradually mature, in the process of production automatic detection technology application is also more and more widely in the manufacturing of signal collection, transmission and data processing requirements is higher and higher. And in the automatic detection of intelligent instrument is indispensable for application of intelligent instrument requirement is higher and higher. Not only ask its high reliability and stability and precision, and it requires its have automation, multi-functional and intelligent development. Due to the development of field bus technology has the characteristics of opening the bottom of the multi-point communications and digital control network characteristics. The field bus technology is an inevitable trend in the development of digital. But considering current international traditional industrial control field 4 ~ 20mA based on the simulation equipment still widely. So must realize the transition of analog to digital, consequently hart agreement apply, it is to achieve this transition of the most powerful tool.HART protocol is intelligent instruments and control equipment communication. After years of development, HART technology has been very mature, and has become a global of intelligent instrument industry standard.This paper mainly studied under the communication protocol accords with hart intelligent instrument for analog signals and digital signal real-time transmission, research and design the intelligent pressure transmitter system. This design mainly in hart agreement on the basis of the transmitter system, the design of hardware modules including micro processing system module, sensor module and communication module, D/A and A/D module. Then this system software design. Do temperature drift and nonlinear compensation method so that the system of measurement precision greatly improved. At the same time also on the software structure of the system and hardware debugging problems are analyzed and summed up.