【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 ,它在提供现场总线的好处时 ,保留对现有 4～ 2 0mA系统的兼容性。对于一个典型的HART智能仪表 ,其电路组成一般包括电源模块、传感器接口电路、A/D转换、MCU、D/A输出等。更多还原

【Abstract】 The HART protocol provides a uniquely backward compatible solution for smart instrument communication as both 4～20?mA analog and digital communication signals are transmitted simultaneously on the same wiring. HART provides many benefits promised by fieldbus, while retaining the compatibility and familiarity of existing 4-20mA systems. The circuit for a typical HART smart Transmitter mainly include power module, sensors,A/D converter, microprocessor, D/A converter etc.更多还原