Which of these connection methods are not used to wirelessly control a robot?

• A. Serial Links
• B. Radio Frequency
• C. Bluetooth
• D. Infrared

Answer: (A)

Wireless control relies on channels that carry commands through the air, like radio-frequency links, Bluetooth, or infrared. Serial links, on the other hand, are a traditional wired communication method that uses a physical cable (such as UART over a cable) to move data between devices. Because of that, they aren’t used to wirelessly control a robot by themselves. Of course, you could enable wireless control by placing a separate wireless bridge that carries UART data, but that’s using a wireless medium to forward the serial data, not a wireless serial link itself. So the method that is not used to wirelessly control a robot by default is the wired serial connection.