This research works out a design of signaladaptor 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 controllable adaptor includes casing and connecting circuit inside the casing, and features that partial connecting circuit is provided with serial control switch controlled outer control signal.