INTERFACES
9
OPERATION
7
The settings of the
VA6834FC
Interface can be
adjusted using the dip-switches in Table 4. There
are no other adjustments necessary to operate the
unit. The
VA6834FC
will operate successfully as
long as cables are attached properly and technical
specifications are followed.
DIP SWITCH
OFF
ON
Serration
X
HV Output
X
Sync on Green
X
Termination
X
ID Bit
X
Not Used
X
Table 6. Dip switches default setting
7.1 SERRATION PULSE SWITCH
Certain monitors and projectors will exhibit
better stability when the serration pulse switch is
ON. This switch is seldom used and in most
circumstances should be turned OFF.
7.2 H&V OUT SWITCH
When the composite sync channel is used and
RGBS format is desired from the
VA6834FC
,
the H & V OUT switch should be turned off.
When this switch is turned on, the sync. The
connector will output horizontal sync, but not
composite sync. The horizontal sync can be
connected to the sync connector and the vertical
sync signal is connected to the vertical
connector using the H & V OUT switch in the ON
position.
7.3 I.D. BIT SWITCH
Many computers use ID Bits or Sense Pins to
recognize the connection of a monitor to its
video output port. Often, these ID Bits will even
allow the computer to recognize the type of
monitor connected in terms of its scan rate
compatibility. When the I.D. Bit switch is in the
ON position, the
VA6834FC
allows the main ID
Bit (pin 4 on the input connector) to be
connected to the ground signal. This is used
primarily when interfacing to laptop computers to
imitate the presence of a local monitor.
Typically, this recognition will take place during
the boot up stage of the computer. If your
computer does not output video, place the I.D.
Bit switch in the ON position and reboot the
computer. When in the OFF position, the ID Bit
will be passed through the Local Monitor Output
port.
7.4 SYNC ON GREEN OUTPUT SWITCH
In some systems the ability of the
VA6834FC
to
output Sync on Green can be a very helpful
feature. It is important to know that the
VA6834FC
will not separate the sync signal from
the green signal if the input is RGsB. It simply
amplifies the composite sync signal and passes
it through. The
VA6834FC
will combine the sync
signal and the green channel to output a RGsB
signal when the SYNC ON GREEN dip-switch is
in the ON position even if the input is in RGBS
or RGBHV format. If the desired output is RGBS
or RGBHV, then leave the SYNC ON GREEN
dipswitch in the OFF position.
7.5 TERMINATION SWITCH
When the built-in termination switch is set to the
ON position, the input of the interface will be
terminated. As a rule, the termination switch
should be ON. This switch does not affect the
termination of any output signal. The termination
switch should be left in the OFF position if a “Y”
cable is used at the local monitor output
connector.
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