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USB-HART Modem Design and meter reading software development

Author: ShiFeng
Tutor: ZhaoHui
School: University of Electronic Science and Technology
Course: Detection Technology and Automation
Keywords: HART protocol USB interface Man-machine interface
CLC: TP311.52
Type: Master's thesis
Year: 2011
Downloads: 44
Quote: 0
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Abstract


HART protocol is a two-way communication protocol can remotely control field instrumentation , digital frequency signal superimposed on the traditional 4 to 20 mA analog signal loop . As the average of the digital signal is 0 , so it does not affect the control system of the analog signal , to ensure the compatibility with the analog signal . Shows that smart meters in the transition to digital HART protocol transition period when , as in the instrumentation industry gradually digitized its role in a longer period of time , according to the current situation of our country , the HART protocol as a communication instrument market there is still a long lifetimes . There are various handsheet HART protocol for communication in the market , but are very few applications on the PC . In view of this , would like to develop a way to control handsheets based laptop , the vast majority of notebook computers have only USB interface , so we wanted to design a USB-HART Modem converter . It can be a laptop connected to a PC running the software interface , traditional hand-written by the operation of the interface , and the full realization of human-computer interaction . The topics in the design mainly divided into two categories , USB-HART Modem hardware circuit design, interface design software on the laptop . Hardware circuit to achieve the functionality preparation of large amounts of data and are familiar with the HART protocol specification . Completed the hardware circuit mainly by the microcontroller module , noise suppression and load driver module , power module , filter circuit module , modem module and USB to serial communication module , and these modules together to achieve the HART physical layer requirements . PC software design is completed in accordance with the requirements of HART communication protocol in the data link layer and application layer . The software interface is based on dialog , five from the dialog box , USB-HART Modem converter function from the dialog box contains a main dialog . Connection test , verify the software to work properly , the final software applications Note . Designed with traditional HART hand-written function . Run on the PC , so make the operation more convenient , looks more intuitive , and should have good market prospects .

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