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INTERFACES
9
OPERATION 7
According to Table 4, the settings of the
VA6835FC Interface can be adjusted using dip-
switches. There are no other adjustments
necessary to operate the unit. The VA6835FC will
operate successfully as long as the cables are
attached properly and the 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 7. Dip switch default settings
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 HV OUT SWITCH
When the composite sync channel is used and
RGBS format is desired from the VA6835FC, the
HV OUT switch should be turned off. When this
switch is turned on, the composite sync channel
will output horizontal sync, but not vertical sync.
As an alternative to connecting cables to separate
horizontal and vertical channels, one can connect
horizontal sync to the composite sync and vertical
sync signal to the vertical connector, using the HV
OUT dip-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 what type of monitor is
connected (in terms of its scan rate
compatibility). When the I.D. Bit switch is in the
ON position, the VA6835FC 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 a computer. If your
computer does not output video, place the ID 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 VA6835FC to
output sync on green can be a very helpful
feature.
The VA6835FC separates the sync signal from
the green if the input is RGsB. So the output can
be either RGBS or RGBHV. The “Sync on Green”
dip-switch should be in the OFF position if the
desired output is RGBS or RGBHV for any type of
input. This dip-switch should be ON if the desired
output is RGsB.
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 in the ON position. 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.