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![[BenQ FAQ] Projector_How to use RS232 cable to do volume control and sound control on projector - YouTube](https://i.ytimg.com/vi/faGUvcDBmJE/hq720.jpg?sqp=-oaymwEhCK4FEIIDSFryq4qpAxMIARUAAAAAGAElAADIQj0AgKJD&rs=AOn4CLDh2TyYmENnhjb7AFnbOgBVVB7Isg "[BenQ FAQ] Projector_How to use RS232 cable to do volume control and sound control on projector - YouTube")