Analog signal acquisition and convertion is an essential part of industry process control system. Based on μCOS - Ⅱ realtime operation system and Modbus protocol, the design of AD converter module using STM32 was presented. The analog signal from sensor was converted to digital using the ADC of STM32. The data is then sent to RS - 485 bus to the master. The module works on Modbus RTU mode and can be expediently added to any data acquisition system based on Modbus protocol. It has been u-sing in heat net control system and fulfils the requirements.%模拟量参数的采集及转换是工业过程控制的重要组成.文中采用STM32单片机,设计了基于μCOS-Ⅱ实时操作系统、支持Modbus通讯协议的通用ADC模块.传感器模拟信号通过输入通道送入STM32的ADC端口进行AD转换,转换结果通过RS-485发送到RS485总线.模块支持Modbus通讯协议,工作在RTU模式,可方便地应用于采用Mod-bus协议构建的工业数据采集系统中.该模块已经在某市热网监控系统中使用,完全符合控制要求.
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