This research works out a design of signal adaptor circuit of serial communication port between PLC and PC, including input interface circuit and output interface circuit.
设计了PLC与PC机串行通讯口之间信号适配器硬件电路，包括输入接口电路、输出接口电路。
The function of the single-direction shift register which is serial input and parallel output is mainly studied.
研究了串行输入，并行输出单向移位寄存器的功能。
The shift register's function is completion of parallel data input into serial data output. The design of shift register is an important part in the realization of CRC code.
在串行CRC编码实现中，移位寄存器主要完成将并行输人数据转换成串行输出数据的功能，是整个设计的重要组成部分。
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