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 controller main-board is designed with TMS320F2812 as its CPU, and also sets the serial interface and input and output of the switching value on it .
利用TMS320F2812作为CPU设计了控制器主板，同时引出了串口和开关量输入输出模块。
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