Hall Research VSA-31-SP-W - Manual (Page 9)

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Prior to final installation of the user interface and connector panel wall
plates, you need to use the supplied Windows™ software and the serial
cable to program the serial codes needed to operate the projector into the
sender wall plate.
Note on CV and S-Video Inputs
Do not connect the Composite Video and S-Video inputs
simultaneously. Doing so will produce a poor quality image
Note on RS-232 port availability on your PC
Most PCs and notebooks do not have a serial port. So to
program the sender you may need a USB to RS-232 Serial
converter. These are available from Hall Research (Model USB-
RS232-1).
For more on the topic of Serial Control of the projector please refer to
Section 5.0