Hall Research VS-2 - Manual (Page 6)

MODEL VS2
4
Auto: (1 down)
If selected, causes the switch to select the input with active video automatically. The
presence of video is determined by examining the Vertical Sync signal of the input
connectors.
In Auto mode you don’t need to have the pushbutton cord plugged in. However, if a push
button cord is plugged-in, the button itself cannot be used for switching, but the LED
either stays on or blinks to indicate which input is selected. Additionally, it is possible to
blank the output in auto mode using the push-button switch (see Blank dip switch
function below)
Auto Mode with Priority: (1 and 3 down)
There are two modes of operation for the Auto-detection of video. In the default mode
(TTL switch in off position) no priority is assigned to either input. Once the switch finds a
video at one of the inputs, it selects it and stops scanning until the currently selected
input’s video is removed; then the switch will start scanning again.
If the TTL dip switch is down (on) at the same time as Auto switch; then priority is given
to input #1. This means that at any time video is present at input #1 the VS-2 will
automatically select it, regardless of what is happening at input #2. For example if the
Switch is showing an image from input #2 and you plug in a video signal to input #1, the
switch will select #1 right away.
Blank: (2 down)
If enabled, then double clicking the pushbutton will cause the output to go blank. If dip
switch is off, then the double click feature is not there and if the user presses the button
in quick succession, all that the switch will do is to switch between the inputs quickly!