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INTERFACES
10
10
OPERATION 7
In most cases no adjustments are necessary to
obtain a good quality picture on the display;
however, dip-switches located on the front panel
should be set for certain types of input and output
signals. The factory default settings are shown
below in Table 7. The VA6822 will operate
successfully as long as cables are attached
properly and all technical specifications of input
and operating environment are maintained.
DIP SWITCH OFF ON
HV Output X
HV Align X
Option X
Sync on Green X
ID Bit/ Pin 4 X
Not Used X
Table 7. Dip-switch default settings
7.1 H&V OUTPUT SWITCH
This dip-switch controls the type of sync signal
that is present on the HSYNC connector. If the
H&V output dip-switch is in the OFF position, then
the composite sync signal is present on the
HSYNC connector when the input in RGBS or
RGBHV format. If the H&V output dip-switch is in
the ON position, then the horizontal sync signal is
present on the HSYNC connector when the input
is in RGBS or RGBHV format.
7.2 H&V ALIGN SWITCH
By default the H & V ALIGN dip-switch is in the
OFF position, so Horizontal and Vertical SYNC
signals are independent. By turning this dip-switch
to the ON position, the pulse of both HSYNC &
VSYNC signals start at the same point for the
benefits of some LCD projectors.
7.3 OPTION SWITCH
By default, this dip-switch is in the OFF position.
By putting it in the ON position, the duration of
Vertical SYNC of the signal is reduced to 10ms.
This allows stability of the signal on a long run
cable. It is not recommended to use the H&V
ALIGN feature when the Option dip-switch is ON.
7.4 SYNC ON GREEN SWITCH
Often systems that use large matrix switchers are
designed to switch signals in RGsB format. This is
done to reduce the cost of the switcher and cable.
In these types of systems, the ability of the
VA6822 to output Sync on Green can be very
helpful. It is important to note that the VA6822 will
not separate the Sync signal from the Green video
signal if the input signal is RGsB. When the Sync
on Green dip-switch is in the ON position; the
VA6822 will combine a composite sync of -0.3V
amplitude to the green video signal to provide
RGsB output if the input signal is in RGBS or
RGBHV format from the source. When the Sync
on Green dip-switch is in the OFF position, the
unit will provide all RGsB, RGBS or RGBHV
signals at the output connectors in the same
format as the input.
7.5 ID BIT SWITCH
Some computers on the market, especially laptop
computers, require the presence of a local monitor
to correctly output video. The ID Bit switch, when
turned ON, will connect Pin 4 to ground. This
enables the interface to imitate a local monitor if
one is not being used in the system. When the ID
Bit switch is in the OFF position, the ID Bit of pin 4
is passed through to the local monitor output.
7.6 NOT USED
This dip-switch is not used for any settings at this
time.