HART协议已经有很长一段时间了，它仍然是一种很好的选择。HART是工厂自动化领域中采用的一种通信协议。虽然每种协议都有其各自的优点，但就综合性能而言，HART是最佳的解决方案：它可获取增值设备和数字方式的诊断信息，同时还可以与现有的4-20mA自动化结构体系相兼容。-The HART protocol has been a very long time, it is still a good choice. HART is a communication protocol used in the field of factory automation. Although each protocol has its own advantages, but comprehensive in terms of performance, HART is the best solution: it can obtain the value-added equipment and digital diagnostic information, but also with the automation of the existing 4-20mA structure The system of compatibility.