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介绍了一种基于ＲＳ４８５总线的主从分布式温度巡检系统的软硬件结构及主要功能。整个系统以ＰＣ５８６作为主站，以ＡＴ８９Ｃ２０５１单片机、通信接口、传感器接口所组成的电路作为子站，由ＲＳ２３２串口和ＲＳ４８５通信接口实现主站与子站间的联系。该系统构成简单，工作稳定，功能全面，已被应用在热电厂中实现对地下电缆的温度监测
This paper introduces a software and hardware structure and its main functions of master-slave distributed temperature inspection system based on RS485 bus. The whole system takes PC586 as the main station and the circuit composed of AT89C2051 singlechip, communication interface and sensor interface as the substation. The connection between the main station and the substation is realized by RS232 serial port and RS485 communication interface. The system is simple in structure, stable in work and full in function. It has been used in thermal power plants to monitor the temperature of underground cables