机台的主要仪表由压缩机空气压力表、冷媒高压表、冷媒低压表组成；
Machine main instrument is composed of a compressor air pressure gauge, pressure gauge, coolant cooling medium low pressure gauge;
介绍一种低压电力用户远程自动抄表系统，给出了该系统的结构框图，简述了其工作原理与系统的功能特点。
A remote automation meter data reading system for low voltage electric power user is introduced. It gives configuration block diagram, principle and system characteristic.
分析了集中器在低压电力线载波集中抄表系统中的功能，详细介绍了集中器的软、硬件结构原理及具体实现。
This paper analyzes the structure of the automatic meter reading system and the functions of concentrator in this system, de-tails the structure of hardware and software of the concentrator.
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