基于485总线的高精度数据采集系统设计  

Design of High Precision Data Acquisition System Based on 485 Bus

作　　者：卢超[1,2] 梁烁 严帅 王智友 张会新 LU Chao;LIANG Shuo;YAN Shuai;WANG Zhiyou;ZHANG Huixin(National Key Laboratory for Electronic Measurement Technology,Taiyuan 030051,China;Key Laboratory of Instrumentation Science and Dynamic Measurement of Ministry of Education,Taiyuan 030051,China;Beijing Aerospace Systems Engineering Institute,Beijing100076,China)

机构地区：[1]中北大学电子测试技术重点实验室,太原030051 [2]中北大学仪器科学与动态测试教育部重点实验室,太原030051 [3]北京宇航系统工程研究所,北京100076

出　　处：《电子器件》2018年第6期1572-1576,共5页Chinese Journal of Electron Devices

基　　金：国家自然科学基金项目(51425505)

摘　　要：针对数据采集系统中传输距离远、传输容量大和节点多的要求,设计了基于ISO1176T型总线收发器的高精度485总线通信系统。该系统通过主站单元建立485总线并转发指令,从站单元进行高精度数据采集,实现了自动控制多节点轮询采集,可配置各个节点的采样率、采样通道,或查询指定通道数据。实验结果表明,最多可同时采集31个节点的数据,采集精度达到0.7‰,具有很高的应用价值。According to the requirements of data acquisition system in terms of transmission distance,transmission capacity and node requirements,a high-precision 485 bus communication system based on ISO1176T is designed.This system establishes a 485 bus and forwards instructions through the main unit,the slave units acquire high-precision data.The system realizes automatic control of multi-node polling and acquisition,and can configure the sampling rate and sample channels of each node.A specified channel data could also be queried.The experimental results show that the data can be collected up to 31 nodes at the same time with the acquisition accuracy of 0.7‰,which has high value.

关 键 词：数据采集 RS-485总线 ADS1258 多通道 高精度 

分 类 号：TP302[自动化与计算机技术—计算机系统结构]