在双返回模式下，启用多路复用器，电路的功能分成 2 个，即连接在一起的每个接收器 / 发送器对拆解和重构他们各自的信号。差分曼彻斯特码数据进入差分曼彻斯特码接收器模块，接着又回到差分曼彻斯特码发送器模块。同样，G.703 数据进入G.703 接收器模块
SMC AM850-N20-T APPROX 2″ NPT 150 PSI MIST SEPARATOR, N
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DAYTRONIC 3215 105-135 VAC THERMISTOR CONDITIONER/INDIC
RELIANCE ELECTRIC DISTRIBUTED CONTROL SYSTEM COMMUNICAT
ALLEN BRADLEY 135893 PRECHARGE SCR BOARD, SEALED,
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ALLEN BRADLEY 3 AXIS CONTROL MODULE 90778308 8520-ASM3
ALLEN BRADLEY REMOTE I/O MODULE 8520-RIOM 156754 REV. 0
