Hart Communication Protocol

Introduction This step, the system used to implement the relevant elements of the design of signal transmission in the most simple point to point wireless transmission standard, such a transfer in the case of a reduced number of signals can be said is a simple and practical, but against the number of signals and the limited space, this design approach appears to be somewhat awkward, for example, the number of signals as lead connectors, wire increases, the fact not only the control of a batch of missiles Fuze System Design pressure also due to the use of a large number of connectors to reduce the reliability of signal transmission, but also because of the presence of a Many of the son of reducing the adaptability of the system to the environment and electromagnetic compatibility.

Fuse with a design technology for controlling the missile system, the functional requirements of more complex, and miniaturization and reliability of its structure, safety requirements and other performance indicators continued to improve, the traditional transmission point son type signal increasingly unable to meet the developmental needs of the system, with the drawbacks of the traditional concept of control technology highlights signaling and digital communication network technology matures, new type of bus transmission system designers in the field's attention increasingly fieldbus as the basic design of signal transmission can effectively point to overcome the drawbacks of traditional cable transmission standard, improve performance of the transmission signal.

1 program principles of system design, signal transmission between the relevant elements of the implementation is essential to the accomplishment of a system function, so, in the process of research and design to ensure that the system works all processes of signal transmission in real time, reliable [1]. specific design principles can be summarized as follows:

A) the principle of succession: a reasonable draw and design experience in the design tradition mature and rational, and the new regime of signal transmission systems, to highlight the design, reduce design cycles , improve efficiency, save money.

B) increased by principle: program fieldbus itself is relatively conventional design of a major breakthrough, so that the signal transmission system in the process of study and design should focus on future needs based on mature technologies, as far as possible the use of advanced methods and products to optimize the material and review protocols for flexible communication and efficient at high speed.

C) the principles of reliability, a new field bus, carrying in one hand, simplified Cable, contribute to improving the reliability, partly because of the increased bus interface and the tasks of self sensing, the system complexity increased local, while the shells on the work environment is more severe, may constitute a risk of default of news, so the bus scene selection is important to note the preponderance considerations of performance and reliability, so that rational design.

D) the principle of flexibility: the components of the system controls many different functions, the properties of the signal varies greatly in the program of research and design must be in accordance with their characteristics and needs of general features, flexible configuration using a combination of bus and green way of rational design.

E) the principle of redundancy: redundancy is the traditional signal of the importance of experience in the design process is the basic principle of the program bus, the rational use of redundant architecture will not only d improve the reliability of the bus system, but also to improve the system performance.

2 Design a preliminary.