【摘要】 HART协议是由模拟系统向数字系统转变过程中唯一向后兼容的智能仪表解决方案,它在兼顾现场总线好处的同时,保留对现有4~20 mA系统的兼容性。从HART协议智能温度变送器的功能和协议出发,分析了HART协议智能温度变送器的特点,设计了HART协议智能温度变送器实用电路,指出了硬件设计中应考虑到的问题。更多还原

【Abstract】 The HART protocol provides a unique backward compatible solution for smart instrument communication as both 4~20 mA analog and digital communication signals are transmitted simultaneously on the same bus.HART provides many benefits promised by Fieldbus,while retaining the compatibility and familiarity of the existed 4~20 mA systems.Based on the function and the protocol of the intelligent temperature transmitter,this paper analyzed the characteristic of the HART protocol intelligence temperature transmitter,designed its practical electric circuit,pointed out the considered problem of the hardware design.更多还原