Hall Research DVS-4A - Manual (Page 10)

4-Port DVI Switch with Audio & Serial Control
8
. Priority Selection in Auto Mode
The priority of the Video 1 through Video 4 inputs can only be selected
by a command through the RS232 port.
This priority selection only applies to Auto mode. If a video priority is
selected, the DVS-4A will automatically select that ‘Video' input
whenever it detects the presence of a video signal at that ‘Video’
connector, regardless of what is happening at the other ‘Video’
connectors. A priority value can be set for all four ‘Video’ input
connectors.
For example, the priority has been set for ‘Video 2’, ‘Video 4’, ‘Video 1’
and then ‘Video 3’. If the ‘Output’ is playing the video & audio from
‘Video 3’ and video from ‘Video 1’ is detected, the output of the DVS-4A
will change to select ‘Video 1’ video immediately. Video detection on
either ‘Video 2’ or ‘Video 4’ would take precedence over the ‘Video 3’
signal.
. Long Cable Equalization
The use of long DVI cables can cause the ‘Video’ image to degrade to
unacceptable levels. Enabling the ‘BOOST’ signal, can sometimes
compensate for the cable length and produce an acceptable picture.
The ‘BOOST’ setting can only be selected by a command through the
RS232 port.
. Scan Mode
The unit can operate in Scan Mode by pressing the SEL 3 and SEL 4
buttons simultaneously for 3 seconds.
When in Scan mode, the SEL 3 and SEL 4 LEDs will flash to indicate the
mode is active.
In scanning mode, the unit will display each of the video and audio input
signals for a pre-determined time period from 1 to 60 seconds.
The unit can also be programmed (via the RS232 port) to scan only
active video inputs or even inputs without a video signal.