The Field Bus is a full digital, multiple variable, and bi-directional communication system with multiple stations.
现场总线是用于现场设备和中央控制室控制设备间的一种全数字、多变量、双向、多站的通信系统。
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USB (Universal Serial Bus) is a new interface technology used in PC field, a stylish interface that is Swiftness, Bi-directional, Cheapness, and Hot-plugging.