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设计了一种基于４～２０ｍＡ标准的智能仪表．采用较为通用的硬件设计出低功耗系统以满足４～２０ｍＡ模拟标准，同时又满足数字信息传输的要求．介绍了系统的工作流程及通信模块设计．
A smart meter based on 4 ~ 20mA standard is designed. The use of more general-purpose hardware to design a low-power system to meet the 4 ~ 20mA analog standards, while meeting the requirements of digital information transmission. Introduced the system workflow and communication module design.