StarTech.com SV231DD2DUA User manual

Dual DVI USB KVM Switch
2/4-Port Dual DVI, USB
KVM Switch with Audio and
USB 2.0 Hub
SV231DD2DUA
SV431DD2DUA
Instruction Manual
Manual Revision:08/19/2010
For the most up-to-date information, please visit www.startech.com

FCC Compliance Statement
This equipment has been tested and found to comply with the limits for a Class B digital
device, pursuant to part 15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference in a residential installation. This
equipment generates, uses and can radiate radio frequency energy and, if not installed
and used in accordance with the instructions, may cause harmful interference to radio
communications. However, there is no guarantee that interference will not occur in a
particular installation. If this equipment does cause harmful interference to radio or
television reception, which can be determined by turning the equipment off and on, the
user is encouraged to try to correct the interference by one or more of the following
measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the receiver
is connected.
• Consult the dealer or an experienced radio/TV technician for help.
Use of Trademarks, Registered Trademarks, and other Protected Names and Symbols
This manual may make reference to trademarks, registered trademarks, and other
protected names and/or symbols of third-party companies not related in any way to
StarTech.com. Where they occur these references are for illustrative purposes only
and do not represent an endorsement of a product or service by StarTech.com, or an
endorsement of the product(s) to which this manual applies by the third-party company
in question. Regardless of any direct acknowledgement elsewhere in the body of
this document, StarTech.com hereby acknowledges that all trademarks, registered
trademarks, service marks, and other protected names and/or symbols contained in this
manual and related documents are the property of their respective holders.

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Table of Contents
Introduction..................................................................... 1
Packaging Contents.....................................................................1
System Requirements .................................................................1
Installation....................................................................... 1
Hardware Installation...................................................................2
Driver Installation.........................................................................4
Operation......................................................................... 4
Front Panel ..................................................................................4
Rear Panel (SV431DD2DUA only) ..............................................5
HotKey Control ............................................................................6
Alternative Hotkey Commands ....................................................8
Change Leading Hotkey ..............................................................9
Specifications.................................................................. 10
Technical Support........................................................... 11
Warranty Information ...................................................... 11

1
Introduction
Packaging Contents
• 1 x SV231DD2DUA or SV431DD2DUA KVM switch
• 1 x Power Adapter
• 1 x Instruction Manual
System Requirements
• DVI enabled computer system/video card
• USB enabled computer system
• DVI enabled display devices (e.g. monitor, projector, TV, etc.)
• A standard 104-key wired USB keyboard
• A standard 3-button wired USB mouse
Installation
NOTE: Prior to the installation, please power off all devices that will be
connected to this system.
Ensure that all devices you will connect are properly grounded.
Place cables away from fluorescent lights, air conditioners, and
machines that are likely to generate electrical noise.
If you experience any problems using a USB KVM switch, the
following BIOS setup changes may be necessary for PC users and not
necessary for Mac users:
• Set HALT ON ERROR to ALL BUT KEYBOARD.
• In PNP AND PCI SETUP, set PNP OS INSTALLED to YES and set
USB IRQ to ENABLED.
Different systems may use different naming, so contact your system
manufacturer for further assistance with these settings.

2
Hardware Installation
Front View (SV431DD2DUA shown)
Rear View (SV431DD2DUA shown)

3
* installation pictures are representation only
1. Plug 1 or 2 monitor(s) into the Console side DVI connector(s); plug a
USB keyboard and a USB mouse into the dedicated USB keyboard
and mouse ports on the KVM switch.
2. Use a male-to-male DVI video cable to connect the DVI connector(s)
on the computer’s video card, to one of the KVM’s PC ports
(ie. PC1). A dedicated DVI, USB and audio 4-in-1 KVM cable can be
used (ie. StarTech.com ID: USBDVI4N1A6).
3. Use a USB type A-B Cable to connect the KVM’s USB port (type B,
square connector) for the PC port used in Step 2, and the USB port
on the computer (type A, flat connector).
4. Repeat for Steps 2 and 3 for each PC port on the KVM switch, or
each computer you wish to use on the KVM.
NOTE: Make sure that you have connected monitor(s) into the
Console’s DVI port(s) before plugging/unplugging the PC’s video
connector(s).

4
Driver Installation
No driver installation is required for the KVM switch, as the keyboard
and mouse uses native USB keyboard/mouse drivers that are already
installed on all operating systems that fully support USB.
Operation
Front Panel
Port Selection/Link LED
The LED turns green when the connected computer is powered-on.
The corresponding LED will also illuminate red when that PC port is
currently selected.
Port Selection Button
Pushing the front panel “Select” button toggles between the PC ports
on the KVM switch.
Auto Scan
The KVM automatically scans through the powered-on computers in
sequence on a fixed time interval (see Scan Time below).
To activate Auto Scan, press down front panel push buttons “3” and “4”
simultaneously. The port LED flashes during Auto Scan. Auto Scan is
effective for powered-on computers only. To exit the Auto Scan mode,
just tap any one of the push buttons. (SV431DD2DUA only)
NOTE: When Auto Scan detects any keyboard activity, it suspends the
scanning until the activity stops; it then resumes with the next computer
in sequence. The length of the Auto Scan interval (Scan Rate) is
adjustable, see below.

5
Scan Time
Four options are available for users to set the Scan Time duration,
which includes 3, 8, 15 and 30 seconds.
To change the Scan Time interval, press both front panel buttons “1”
and “2” simultaneously. The unit beeps 1, 2, 3 or 4 times for Scan Time
of 3, 8, 15 or 30 seconds respectively. (SV431DD2DUA only)
NOTE: Scan Time is automatically set to the default of 3 seconds when
the units loses power.
Rear Panel (SV431DD2DUA only)
To adjust the video signal strength/equalization settings for the length
or quality of DVI cable being used, the “FUNC” button combined with
the front panel push buttons can be used.
1. Press “FUNC” button three times, and the LED for “POWER” will
start to flash once per second.
2. Press front panel push button “1” one or two times to adjust the
signal equalization with one beep (normal) or two beeps (enhance)
respectively.
or
Press front panel push button “3” one or two times to adjust the
video signal output current with one beep (normal) or two beeps
(enhance) respectively.
or
Press front panel push button “4” one, two, three, or four times to
adjust the output emphasis with one beep (no pre-emphasis), two
beeps (low pre-emphasis), three beeps (medium pre-emphasis), or
four beeps (high pre-emphasis).
3. Once the settings have been adjusted, press the “FUNC” button one
time to exit this mode.

6
HotKey Control
A Hotkey command is a short keyboard sequence for selecting a
computer, activating computer scan, etc. A hotkey sequence starts
with two left <CTRL> keystrokes (successively within 0.2 seconds)
followed by one or two more keystrokes. A high-pitch beep will be
generated for each correct hotkey command; otherwise, one low-pitch
beep is generated for errors and the bad key sequence will not be
forwarded to the selected computer.
NOTE: Press and hold Left <SHIFT> and press <NumLock> twice,
then release <SHIFT> followed by pressing left <CTRL> once, which
will enable / disable the hotkey feature.
To select a computer:
Left <CTRL> + Left <CTRL> + <1>
(Example: Selects the computer at port 1.)
Left <CTRL> + Left <CTRL> + <2>
(Example: Selects the computer at port 2.)
NOTE: Do not use the keypad on the right-side of the keyboard.
Auto Scan
The KVM automatically scans through the powered-on computers in
sequence on a fixed time interval (see Scan Time below).
To start Auto Scan:
Left <CTRL> + Left <CTRL> + <F1>
To abort the Auto Scan mode, press the left <CTRL> key twice.
NOTE: When Auto Scan detects any keyboard activity, it suspends the
scanning until the activity stops; it then resumes with the next computer
in sequence. The length of the Auto Scan interval (Scan Rate) is
adjustable, see below.
Manual Scan allows users to manually switch back and forth between
powered-on computers.
Left <CTRL> + Left <CTRL> + <F2>

7
To select the previous or the next computer, press <UP> or <DOWN>
arrow keys. To abort the Manual Scan, press any other key.
Scan Time
Four options are available for users to set the Scan Time duration, it
Includes 3, 8, 15 and 30 seconds.
Note: Scan Time is set to 3 seconds by default.
To adjust Scan Rate, set the scan time of duration before switching to
the next computer:
Left <CTRL> + Left <CTRL> + <F3>
The KVM Switch generates 1 to 4 beeps indicating a scan time
duration for 3, 8, 15 or 30 seconds respectively.
USB-Port Rule
There are two settings for USB-Port Rule: ON or OFF.
When set to ‘ON’, the USB Hub port follows computer selection.
When set to ‘OFF’, the USB Hub port stays on the currently selected
PC port.
SV231DD2DUA: press the hotkey below to turn ON/OFF the USB-Port
Rule for USB 1 and USB 2:
Left <CTRL> + Left <CTRL> + <F7>
SV431DD2DUA:
USB 1: press the hotkey below to turn ON/OFF the USB-Port Rule:
Left <CTRL> + Left <CTRL> + <F7>
USB 2: press the hotkey below to turn ON/OFF the USB-Port Rule:
Left <CTRL> + Left <CTRL> + <F8>
To change the PC port that the USB hub stays on to the currently
selected PC port, press the following hotkey:
Left <CTRL> + Left <CTRL> + <U>
NOTE: Please make sure that installation of the USB device has been
accomplished before switching to the next computer.