Hall Research VS-2A-PRG - Manual (Page 8)

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Model VS-2A-PRG
. Modes of Operation
The unit can operate in either Auto or Manual mode by pressing the mode
button to select it.
In Auto mode, the VS-2A-PRG will automatically select the input with
active video and audio. The presence of video is determined by
examining the V. Sync signal of the input connectors. The front panel
SELECT button cannot be used to switch between PC 1 and PC 2 input
sources in this mode. However, it can be used to blank the output by
holding it down for 3 seconds or to un-blank the output by pressing it
once.
In Manual mode, the output of the VS-2A-PRG will depend on the
selection of the switched output SELECT button.
. Front Panel Lockout
The Front panel controls can be locked so that the unit’s configuration
will remain unchanged until the front panel is unlocked or the
configuration is changed via the serial port.
To lock or unlock the front panel, hold the Priority Selection button for 3
seconds. All the front panel lights will flash to signify the status change.
If the units front panel is locked and the user presses any of the buttons,
the front panel led’s will flash rather than changing the selection.
. Priority Selection in Auto Mode
The priority button is used to select the priority as none, input #1 or input
#2. This priority selection only applies to the Auto mode. If INP 1
priority is selected, the VS-2A-PRG will automatically select input #1
whenever it detects the presence of video at the PC 1 input, regardless of
what is happening at input #2. If INP 2 priority is selected, the VS-2A-
PRG will automatically select input #2 whenever it detects the presence of
video at the PC 2 input, regardless of what is happening at input #1. For
example with INP 1 Priority set, if the output is playing the video & audio
from PC 2 input and the video from PC 1 input is detected, the output of
the VS-2A-PRG will select PC 1 (input #1) immediately. With priority set
to none, the unit stays selected to the current input as long as it is
detecting video there.