Hall Research VSA-32 - Manual (Page 9)

A / V Switch-Cat TM
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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. The quality of the CV signal may depend on
your video source; contact Hall Research for possible assistance.
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
4.0 Operation
The VSA-32 system operation has been designed to be powerful yet simple to
use. There are 7 buttons on the User Interface wall plate for powering the
projector, video source selection, volume and mute control as well as a user
definable AUX button.
The buttons are back-lit so you can tell which video or audio input is selected. If
the command string being transmitted to the projector has a ‘wait’ delay inserted,
then during the prescribed wait time, the LED will be blinking and the user cannot
switch channels.
There is a volume knob on the User Interface with a corresponding LED bar to
indicate the current loudness setting. The Volume Select button is used to specify
whether you are adjusting the AV volume or the Microphone volume.
The VSA-32 remembers the settings independently for each input. So as you
switch between inputs, the volume setting recalls the last setting of that input.