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工业控制环境中,希望用最少的信号线完成远程通信任务,通常采用串行数据传输的方法,一般为2～4线制,以两线制应用最广。
Industrial control environment, hoping to use the minimum number of signal lines to complete long-range communications tasks, usually using serial data transmission method, usually 2 to 4-wire system, the most widely used two-wire system.