| 摘要 |
PURPOSE:To prevent the generation of constraint in the transmission pattern of data, by sending out the balanced output of a differential amplifier type driver by a pair of stranded cables at a transmission side, and connecting each of the pair of stranded cables to a differential amplifier type receiver and gate respectively at a reception side. CONSTITUTION:At the transmission side, a transmission data signal SD is inputted to the data input terminal of a differential amplifier type driver 1 having a three-state output, and a transmission request signal RTS, to an enable terminal, respectively, and the balanced output of the driver is sent out to a receiver by a pair of stranded cables 4a and 4b. At the receiver, each of the pair of stranded cables 4a and 4b is connected to a voltage source through a resistor respectively, and also, to a differential amplifier type receiver 2. And when the signal RTS is a logic 1, the output of the driver goes to low impedance, and a carrier detection signal CD that is the output of a NAND gate 3 goes to the logic 1, representing the reception of a carrier. Therefore, it is possible to transmit each of signals (SD-RD), and (RTS-CD) without putting the constraint on a data pattern.
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