The USB port is for supplying power (e.g., dongles) and service needs.
NOTE: The USB port does not supply power when the projector is in standby
mode.
When you use a RS-232 serial port cable to connect the projector to an external computer certain
functions can be controlled remotely by the PC, including Power On/Off, Volume adjustment,
USB Type A Connection
LS740HD - ViewSonic Projectors https://manuals.viewsonic.com/LS740HD_Full_Guide
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