Which control method is characterized by a one-way communication system?

The control method characterized by a one-way communication system is infrared control. This technology utilizes light waves to transmit signals from a remote control to a receiving device. The communication is unidirectional, meaning that commands sent from the remote control go only to the receiver without any feedback or confirmation being sent back.

In a typical infrared setup, a user presses a button on the remote, which emits an infrared signal to the device intended to be controlled, such as a TV or projector. The device then receives the signal and executes the commanded function, such as changing the volume or channel. However, there is no mechanism for the device to send information back to the remote, which distinguishes this method from others that allow for two-way communication.

Other options, such as Ethernet communication and bidirectional control, enable feedback and communication from both ends, while wireless networking can vary in its type of communication but often supports two-way data exchange as well. This contrast with the one-way nature of infrared control clarifies its unique position among the mentioned methods.