描述
HART(Highway Addressable Remote Tranducer可寻址远程传感器数据通路)美国Rosemount公司1989年推出,主要应 用于智能变送器。HART为一过渡性标准,它通过在4-20mA电源信号线上叠加不同频率的正弦波(2200HZ表“0”,1200HZ表“1”)来传送数字信号,从而保证了数字系统和传统模拟系统的兼容性,预计其生命周期为最近20年。
CAN(Controller Area Network控制局域网络)德国Bosch 6公司1993年推出,应用于汽车监控、开关量控制、制造业 等。介质访问方式为非破坏性位仲裁方式,适用于实时性要求很高的小型网络,且开发工具廉价。Motorala、Intel、Philips 均生产独立的CAN芯片和带有CAN接口的80C51芯片。CAN型总线产品有AB公司的DeviceNet、台湾研华的ADAM数据采集产品等。
产品承诺
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