ViewSonic LS740W - USB Connection

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USB Connecon
USB Type A Connecon
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.
HDMI 2 HDMI 1
RS232
USB 5V/1.5A
(SERVICE)
AUDIO OUT
DC IN