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。
2
The function of the single-direction shift register which is serialinput 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。
3
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.