二线无源led现场显示单元是指在不外接直流电源的前提下，实现二线制变送器检测到的工业参数LED现场显示。
On the basis of no outer direct flow power source, tow-wire passive LED local displaying unit realizes LED local displaying of industry parameter which tow-wire transmitter inspects.
确定模块式结构的直流屏电源监控装置，分为主监控单元、绝缘检测单元、系统参数监控单元、电池巡检单元。
The DC power system is determined to be composed of the main monitoring system , the DC insulation monitoring system and the parameter monitoring system with a blocking structure.
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