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Tuesday, November 18th, 2008 at 00:19 | No comments

Categories: Communication Networks

Tags: communication protocol, HART, long-distance correspondence, scene measuring appliance

Short Content: First, HART agreement synopsis 　　HART (Highway Addressable Remote Transducer), the addressable long-distance sensor high speed channel's opening communication protocol, is American Rosemen Corporation one kind which promoted in 1985 uses between the scene intelligence measuring appliance and the control room equipment's communication protocol. 　　The HART installment provides has the relatively low band width, the moderate response time's correspondence, underwent more than 10 years development, the HART technology in overseas was very already mature, and has become the global intelligence measuring ...

Sunday, October 26th, 2008 at 22:17 | No comments

Categories: Communication Networks

Tags: A5191HRT, HART, modem

Short Content: Abstract: First introduces A5191HRT the HART modem's principle. A5191HRT internal integrated has conformed to the Bell202 standard complete modulation demodulation electric circuit, was convenient with the microprocessor connection, is advantageous for the construction intelligence scene measuring appliance's HART agreement connection module electric circuit. Finally gives some intelligent scene measuring appliance based on A5191HRT and the AD421 electric current ring content, the mold switch's HART agreement connection module design.Key word: HART agreement; Serial communication; Frequency-shift keying; Modem 1 introduction    In the ...