| 摘要 |
A combined digital line driver and sensor for both transmitting and receiving digital control signals between a plurality of stations over a single conductor. Each station includes an emitter follower which acts as a fraction of an OR gate for driving the digital control signal over the transmission line. The transmission line is connected to one input of a two-diode AND gate. The other input to the AND gate is connected to the input of the emitter follower via an inverter amplifier. The output of the AND gate will contain the received control signal transmitted from some other station unless the associated station is also transmitting a control signal.
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