基于ARM的可编程数显表的设计

Design of Programmable Digital Display Instrument Based on ARM

以ARM微控制器LPC 1114为核心,设计了一种可编程多功能测控数显表。通过按键可设置参数,以适应不同的工作情况和使用要求。该数显表可对输入直流电压、电流标准信号进行采样;采用热电阻或热电偶测温;可设置上下限过温报警;带有MODBUS协议的RS 485通信接口。与传统数显表相比,该数显表可一表多用,测量精度高,工作可靠。

The paper describes a specialized digital display instrument system according to ARM. Different parameters are set by using keys, so digital display instrument can be adapted to different situations. Thermal resistance or thermocouple is adopted to monitor the temperature. Upper and lower limits and overtemperature alarm can be set. Having the 485 commu-nication interface with Modbus agreement,the instrument samples the standard signal of DC voltage or current. Compared to traditional instrument,this instrument works reliably with high precision and can be widely used in many oceassions.