Hall Research VS-4A - Manual (Page 8)

4 Channel VGA Switch w/Audio & Serial C ontrol
6
3.2 Front-Panel Switches
The front panel switches may be locked out so pressing them has
no effect. Locking and unlocking the front panel switches can only
be accomplished via the serial RS-232 commands.
The first function of the front panel buttons is to switch from one
VGA & Audio signal to another. Just press the button and the VGA
signal you selected will be displayed when the front panel is not
locked. If there is no VGA signal to be displayed then you will see
a black screen. The VS-4A will enter the Normal Mode any time a
single front panel button is pressed and the front panel is not
locked.
The second use of the front panel buttons is to put the VS-4A into
Auto Mode. Press buttons 1 and 2 simultaneously and the VS-4A
will enter the Auto Mode when the front panel is not locked.
The third use of the front panel buttons is to put the VS-4A into
Scan Mode. Press buttons 3 and 4 simultaneously and the VS-4A
will enter the Scan Mode when the front panel is not locked.
The time interval between switching will be the time interval last
specified via the serial port. If no interval has been specified via
the RS232 port then the default is 5 seconds.
Whether or not to scan non-active VGA inputs along with active
VGA inputs will be determined from the last user input via serial
port. If there has been no user input, the default is to not scan the
non-active VGA inputs.