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ONLINE SERIAL COMMUNICATION INTERFACE AND METHOD FOR ESTABLISHING CURRENT CIRCUIT TERMINAL LINE COMMUNICATION
ONLINE SERIAL COMMUNICATION INTERFACE AND METHOD FOR ESTABLISHING CURRENT CIRCUIT TERMINAL LINE COMMUNICATION
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机译:在线串行通信接口和建立电流电路终端线通信的方法
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摘要
An on-line serial communication interface is established from the transmitter of a two line current loop transmitter to a digital circuit such as a computer or hand-held terminal which receives and processes digital voltage pulses. The interface includes a comparator having a positive terminal connected by a capacitor to one of the current lines, and a negative terminal connected to a source of small positive voltage. The output of the comparator is connected to an input port of the digital device. The transmitter modulates the current on the current loop by a small amount with respect to the analog current communicated by the transmitter. This generates voltage pulses in the capacitor which are compared to the selected voltage and are amplified to form large pulses used for communication with the computer or hand-held terminal.
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