论文部分内容阅读
HART协议(全名Highway Add ressable Remote Transducer,高速可寻址远程传感器),用于现场智慧仪表和控制端间的一种全球标准通信协议,该协议目前向所有用户免费开放,注册商标和版权为HART通讯基金会(HCF)所有。HART协议采用基于Bell202标准的FSK频移键控信号,在4mA~20mA信号上迭加幅度为0.5mA的数字信号来进行双向数字通讯,通讯传输鲍率为1200bps,数字信号用两个频率表示:1200Hz代表逻辑‘1’,2200Hz代表逻辑‘0’,如图1所示,是同时具有模拟量和数字量两种信号的传输功能,因此,用户可
HART protocol (full name Highway Add ressable Remote Transducer), a worldwide standard communication protocol for on-site smart meters and controls, is currently open to all users for free, with registered trademarks and copyrights of HART Communication Foundation (HCF). HART protocol uses FSK frequency shift keying signal based on Bell202 standard. The digital signal of amplitude 0.5mA is superimposed on the 4mA ~ 20mA signal for bidirectional digital communication. The transmission rate of communication is 1200bps, and the digital signal is represented by two frequencies: 1200Hz represents the logic ’1’, 2200Hz represents the logic ’0’, as shown in Figure 1, is a transmission function of both analog and digital signals, so the user can