摘要
设计了一种HART协议通信接口。给出了具体的软硬件设计,采用HART专业低功耗调制解调芯片AD5700实现了HART信号的调制、解调与载波监听,利用AD5421电流环数模转换器实现了4m A-20m A电流输出及变送器的二线制传输,达到了变送器与上位机进行HART远程通信的目的。
This paper develops a kind of HART protocol communication interface. The hardware and software design are briefly introduced. This design not only realizes the modulation, demodulation and carrier sense of HART signal by using low-power HART modem ADS700, but also realizes the 4mA - 20mA current output and the transmitter＇s two-wire transfer by applying AD5421. The tests show that the remote communication between the HART transmitter and PC is well.
出处
《信息技术》
2015年第1期188-190,共3页
Information Technology
