Operation

INTERFACES

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.

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.

DIP-SWITCH

Serration

HV Output

Sync on Green

Termination

ID Bit

Not Used

OFF

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

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.

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.