XG-NV5XE (serv.man51). Presentation software - Sharp Projector User Guide / Operation Manual. Page 31

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Check that the connection type is surely selected as you intend

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Check that the infrared ports (the projector and the PC) are within
1 metre (3 feet) distance and keep the vertical and horizontal range
within 30 degrees 

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Check that there are no obstacles between the projector and the
PC.

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Avoid using this function under strong lighting conditions.
Strong light sources such as sunlight or fluorescent lighting may
interfere with image transmissions.

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Check that the projector is in the IrCOM mode before transferring
images from the PC. (See the projector operation manual.)
The On-screen Display “IrCOM stand by” or “IrCOM stand by
Waiting for Data” will appear on the projection screen.

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Check that your PC’s IrDA port is activated and configured properly.
Check the PC’s  instruction manual.

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Check that “Wireless (IrCOM)” is selected in the “File” menu

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Confirm that the port for infrared communications is correctly specified
in the PC’s settings 

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For Windows 95 users: Check that Microsoft’s IrDA 2.0 (Infrared
Driver) is installed 

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Check that the display mode is appropreate for  the images. (Normal
transfer: 24 bit colour or less; “startup Image” transfer: 256 colours
for BMP files)

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Check that the port for the RS-232C serial cable is correctly specified
in the PC’s settings 

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Check that the cable is correctly and securely connected 

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Reconnect the RS-232C serial cable and try again.
The cable may not be connected properly or an error may have
occurred during the transmission.

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Check that the port for serial (RS-232C) communications is correctly
specified in the PC’s settings