Black Box KV2004A User manual

BL A C K B OX®
Control up to four computer systems and share
peripherals among them.
KV2004A supports one video head per channel, KV2204A supports two,
KV2304A supports three, and KV2404A supports four.
ServSwitch Wizard DVI DL
March 2010
KV2004A KV2304A
KV2204A KV2404A
Order toll-free in the U.S.: Call 877-877-BBOX (outside U.S. call 724-746-5500) •
FREE technical support 24 hours a day, 7 days a week: Call 724-746-5500 or fax [phone] •
Mailing address: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018 •
Web site: www.blackbox.com • E-mail: [e-mail]
Customer
Support
Information

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ServSwitch Wizard DVI DL
Trademarks Used in this Manual
Black Box and the Double Diamond logo are registered trademarks, and ServSwitch Wizard is a trademark, of BB Technologies,
Inc.
Apple and Mac are registered trademarks of Apple Computer, Inc.
IBM is a registered trademark of International Business Machines Corporation.
Linux is a registered trademark of Linus Torvalds.
Windows is a registered trademark of Microsoft Corporation.
Sun is a registered trademark of Sun Microsystems, Inc.
Unix is a registered trademark of UNIX System Laboratories, Inc.
Any other trademarks mentioned in this manual are acknowledged to be the property of the trademark owners.
We‘re here to help! If you have any questions about your application
or our products, contact Black Box Tech Support at 724-746-5500
or go to blackbox.com and click on “Talk to Black Box.”
You’ll be live with one of our technical experts in less than 20 seconds.

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FCC and IC RFI Statements
Federal Communications Commission and Industry Canada Radio Frequency Interference
Statements
This equipment generates, uses, and can radiate radio-frequency energy, and if not installed and used properly, that is, in strict
accordance with the manufacturer’s instructions, may cause interference to radio communication. It has been tested and found to
comply with the limits for a Class A computing device in accordance with the specifications in Subpart B of Part 15 of FCC rules,
which are designed to provide reasonable protection against such interference when the equipment is operated in a commercial
environment. Operation of this equipment in a residential area is likely to cause interference, in which case the user at his own
expense will be required to take whatever measures may be necessary to correct the interference.
Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to oper-
ate the equipment.
This digital apparatus does not exceed the Class A limits for radio noise emission from digital apparatus set out in the Radio
Interference Regulation of Industry Canada.
Le présent appareil numérique n’émet pas de bruits radioélectriques dépassant les limites applicables aux appareils numériques de
la classe A prescrites dans le Règlement sur le brouillage radioélectrique publié par Industrie Canada.

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ServSwitch Wizard DVI DL
Instrucciones de Seguridad
(Normas Oficiales Mexicanas Electrical Safety Statement)
1. Todas las instrucciones de seguridad y operación deberán ser leídas antes de que el aparato eléctrico sea operado.
2. Las instrucciones de seguridad y operación deberán ser guardadas para referencia futura.
3. Todas las advertencias en el aparato eléctrico y en sus instrucciones de operación deben ser respetadas.
4. Todas las instrucciones de operación y uso deben ser seguidas.
5. El aparato eléctrico no deberá ser usado cerca del agua—por ejemplo, cerca de la tina de baño, lavabo, sótano mojado o cerca
de una alberca, etc.
6. El aparato eléctrico debe ser usado únicamente con carritos o pedestales que sean recomendados por el fabricante.
7. El aparato eléctrico debe ser montado a la pared o al techo sólo como sea recomendado por el fabricante.
8. Servicio—El usuario no debe intentar dar servicio al equipo eléctrico más allá a lo descrito en las instrucciones de operación.
Todo otro servicio deberá ser referido a personal de servicio calificado.
9. El aparato eléctrico debe ser situado de tal manera que su posición no interfiera su uso. La colocación del aparato eléctrico
sobre una cama, sofá, alfombra o superficie similar puede bloquea la ventilación, no se debe colocar en libreros o gabinetes
que impidan el flujo de aire por los orificios de ventilación.
10. El equipo eléctrico deber ser situado fuera del alcance de fuentes de calor como radiadores, registros de calor, estufas u otros
aparatos (incluyendo amplificadores) que producen calor.
11. El aparato eléctrico deberá ser connectado a una fuente de poder sólo del tipo descrito en el instructivo de operación, o como
se indique en el aparato.
12. Precaución debe ser tomada de tal manera que la tierra fisica y la polarización del equipo no sea eliminada.
13. Los cables de la fuente de poder deben ser guiados de tal manera que no sean pisados ni pellizcados por objetos colocados
sobre o contra ellos, poniendo particular atención a los contactos y receptáculos donde salen del aparato.
14. El equipo eléctrico debe ser limpiado únicamente de acuerdo a las recomendaciones del fabricante.
15. En caso de existir, una antena externa deberá ser localizada lejos de las lineas de energia.
16. El cable de corriente deberá ser desconectado del cuando el equipo no sea usado por un largo periodo de tiempo.
17. Cuidado debe ser tomado de tal manera que objectos liquidos no sean derramados sobre la cubierta u orificios de ventilación.
18. Servicio por personal calificado deberá ser provisto cuando:
A: El cable de poder o el contacto ha sido dañado; u
B: Objectos han caído o líquido ha sido derramado dentro del aparato; o
C: El aparato ha sido expuesto a la lluvia; o
D: El aparato parece no operar normalmente o muestra un cambio en su desempeño; o
E: El aparato ha sido tirado o su cubierta ha sido dañada.

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Table of Contents
Table of Contents
1. Specifications ..........................................................................................................................................................................6
2. Overview ..........................................................................................................................................................................7
2.1 Introduction .....................................................................................................................................................................7
2.2 Features ..........................................................................................................................................................................7
2.3 What’s Included ...............................................................................................................................................................8
2.4 Additional Items You May Need........................................................................................................................................8
2.5 Hardware Description, Single-Head Version (KV2004A) ...................................................................................................9
2.5.1 Front Panel ........................................................................................................................................................9
2.5.2 Back Panel .......................................................................................................................................................10
2.6 Hardware Description, Multi-Head Versions (KV2204A, KV2304A, and KV2404A) ........................................................ 11
2.6.1 Front Panel ...................................................................................................................................................... 11
2.6.2 Back Panel ....................................................................................................................................................... 12
3. Installation ........................................................................................................................................................................ 13
3.1 Mounting ....................................................................................................................................................................... 13
3.2 Connections ................................................................................................................................................................... 13
3.2.1 User Console ................................................................................................................................................... 13
3.2.2 Computer Systems...........................................................................................................................................16
3.2.3 Power In Connection .......................................................................................................................................18
3.2.4 Switching Control by Computer .......................................................................................................................19
3.2.5 Synchronizing Multiple Units............................................................................................................................20
3.2.6 Managing EDID VIdeo Display Information.......................................................................................................21
4. Configuration ........................................................................................................................................................................22
4.1 Using the Configuration Menu .......................................................................................................................................22
4.2 General Configuration ....................................................................................................................................................23
4.2.1 Changing Hotkeys ...........................................................................................................................................23
4.2.2 Mouse Switching .............................................................................................................................................24
4.2.3 Miscellaneous Functions ..................................................................................................................................24
4.3 Performing Upgrades......................................................................................................................................................24
5. Operation ........................................................................................................................................................................27
5.1 Selecting a Computer .....................................................................................................................................................27
5.1.1 Select a Computer Using the Front Panel .........................................................................................................27
5.1.2 Select a Computer Using Hotkeys ....................................................................................................................28
5.1.3 Select a Computer Using the Mouse Buttons ...................................................................................................29
5.2 Autoscanning .................................................................................................................................................................29
Appendix A. What Is True Emulation?....................................................................................................................................................31
A.1 Enumerated USB Switching.............................................................................................................................................31
A.2 Emulated USB Switching.................................................................................................................................................31
A.3 True Emulation ...............................................................................................................................................................31
Appendix B. Default EDID Video Modes.................................................................................................................................................33
Appendix C. Cable Pinouts ....................................................................................................................................................................34
Appendix D. Safety Information.............................................................................................................................................................35

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ServSwitch Wizard DVI DL
1. Specifications
Approvals: CE, FCC
Hardware Compatibility: All computers with USB interfaces
Software Compatibility: Operates with all known software and operating systems including Windows®, Linux®, Unix®, BSD,
all Sun®OS, all Mac®OS, NetWare®, etc.
Connectors: Video: KV2004A: (4) dual-link DVI on single head;
KV2204A: (8) dual-link DVI on dual head;
KV2304A: (12) tri-link DVI on tri head;
KV2404A: (16) quad-link DVI on quad head;
Keyboard/Mouse: (2) USB Type A female;
Switched USB: (2) USB 2.0 Type A female
Audio: 3.5-mm stereo jack;
Other: Modular 10p10c for Flash upgrade, sync with other KV2X04A switches, and RS-232 triggered power switches
Operating Temperature: 32 to 104° F (0 to 40° C)
Power: 2.5-mm DC jack (power adapter included),
Input: 100–240 VAC, 50/60 Hz,
Output: 5-VDC, 2-A;
Power consumption: KV2004A: 12.5 watts, KV2204A, KV2304A, KV2404A: 20 watts
Size: KV2004A: 1.73"H (1U) x 9.21"W x 4.72"D (4.39 x 23.39 x 11.99 cm);
KV2204A, KV2304A, KV2404A: 4.375"H (2.5U) x 9.21"W x 4.72"D (11.13 x 23.39 x 11.99 cm)
Weight: KV2004A: 1.87 lb. (0.85 kg);
KV2204A: 2 lb. (0.91 kg)
KV2304A: 2.1 lb. (0.95 kg);
KV2404A: 2.2 lb. (1 kg)

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Chapter 2: Overview
2. Overview
2.1 Introduction
There are four versions of the four-way ServSwitch Wizard™DVI DL, each of which allows a single operator to control up to four computer
systems and share peripherals among them in a very flexible manner. The KV2004A can support one video head per channel, whereas the
slightly larger KV2204A, KV2304A, and KV2404A units support two, three, and four video heads per channel, respectively.
Thanks to high quality, efficient switching technology, each video head can support dual link digital video at up to 450 Mpixels per second.
In addition to the video performance, these units offer more than just straight switching between four systems. The KVM, speakers, and two
separate USB devices attached to the Wizard DVI DL units can either be switched in unison, or you can share your peripherals between any
of the systems to suit your current tasks. For instance, you could be creating e-mails on one system, listening to a soundtrack from another
while a third is sending documents to your printer, and a fourth is performing another task with a different USB peripheral. The ServSwitch
Wizard DVI DL front panels make it easy to control which peripherals should connect to each system.
The ServSwitch Wizard DVI DL units feature True Emulation (see Appendix A), which ensures that the full characteristics of the connected
keyboard and mouse are passed to every system.
2.2 Features
2SPKKVMCOMPUTERKVMSPKUSB1USB2MODEWizardDVIDL
Multiscreen Versions
The ServSwitch Wizard DVI DL includes separate models to support one, two, three, or four video heads per channel.
Multiple Switching
The attached peripheral devices can be switched collectively to any computer system, or they can be linked to separate systems to
achieve multiple tasks in parallel. Multiple switching can be controlled from the on-screen menu or using the front-panel buttons.
Digital and Analog Video
The ServSwitch Wizard DVI DL uses DVI-I (Integrated) connectors throughout so that DVI digital and/or VGA analog video may be
used (VGA requires the use of suitable adapter cables). Do not mix and match analog and digital inputs at the same time.
True Emulation
Earlier USB KVM switches relied upon standard keyboard and mouse templates to tell each computer system how to deal
with the connected peripherals. The ServSwitch Wizard DVI DL range gathers the true identities of the connected keyboard and
mouse and presents those “real” profiles concurrently to every system. Thus, specialized keyboards and mice can be fully
supported.
Intelligent Display Information
The ServSwitch Wizard DVI DL uses an EDID emulation feature to ensure that all computers are supplied with the correct informa-
tion about each connected video display.
USB Remote Wakeup
The ServSwitch Wizard fully supports the USB Remote Wakeup feature. Any connected computer can go into sleep mode and be
awakened (when its channel is selected) as soon as you press a key or move the mouse. Note that the computer and peripherals
must also support the USB Remote Wakeup feature.

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Figure 2-1. Typical application.
2.3 What’s Included
Your package should contain the following items. If anything is missing or damaged, contact Black Box Technical Support
at 724-746-5500 or [e-mail].
• ServSwitch Wizard DVI DL unit (KV2004A) or ServSwitch Wizard DVI DL Multihead unit (KV2204, KV2304A, or KV2304A)
• 12.5-watt or 20-watt power adapter and country-specific power cord
• (4) self-adhesive feet
• CD-ROM containing this user’s manual in PDF format
2.4 Additional Items You May Need
• DVI to VGA adapter (FA462)
• Single-link DVI-D to DVI-D video cable (EVNDVI02-XXXX)
• Combined dual-link DVI-I and USB (USB Type A to B) cable (EHN900024U-XXXX)
• Audio cable (EJ110-XXXX)
• Flash upgrade adapter plus standard 9.6-ft. (3-m) patch lead
• (2) 19" rackmount brackets and (4) screws (RMK2004, RMK2004-2)

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Chapter 2: Overview
2.5 Hardware Description, Single-Head Version (KV2004A)
2.5.1 Front Panel
Figure 2-2 shows the front panel of the ServSwitch Wizard DVI DL. Table 2-1 describes its components.
123
Figure 2-2. Front panel.
Table 2-1. Front-panel components.
Number Component Description
1 COMPUTER button Press to change to the next computer channel.
2 Indicators The four indicators (KVM, SPK, USB1, USB2) show which peripherals are
switched to the current computer channel or (as you begin pressing the MODE
button) the peripherals that will be switched during the next press(es) of the
COMPUTER button.
The seven-segment numeric display indicates the computer channel that
is currently active.
3 MODE button Press to determine which peripherals should be switched to another computer
channel (will occur when you press the COMPUTER button).

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ServSwitch Wizard DVI DL
2.5.2 Back Panel
Figure 2-3 shows the back panel of the ServSwitch Wizard DVI DL. Table 2-2 describes its components.
45
711 11
68910
9
10
910 12
10
9
11
11
Figure 2-3. Back panel.
Table 2-2. Back panel components.
Number Component Description
4 Barrel connector Power input or power supply connects here.
5 (2) USB Type A connectors Connect the console’s USB keyboard and mouse to these connectors.
6 3.5-mm RCA connector User console audio port: Connect optional speakers to this connector.
7 DVI-I connector Connect the console’s DVI-I monitor to this port.
8 RJ-45 port *Options port: This top 10p10c port is used to update the internal firmware
when necessary by connectng to a computer.
9 (4) USB Type B connectors Connect to the computers’ keyboards/mice.
10 (4) 3.5-mm RCA connectors Computer audio port: connect optional speakers to these connectors.
11 (4) DVI-I connectors Connect to the computers’ DVI-I monitors.
12 (2) USB Type A connectors Connect to USB 2.0 peripheral devices.
*NOTE: The OPTIONS port uses a 10p10c socket, which can accommodate both 10p10c connectors as well as the much more
common 8p8c connectors, which are used on Ethernet leads and patch cables. The pin-outs for both types of connectors
are listed in Appendix C.

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Chapter 2: Overview
2.6 Hardware Description, Multihead Versions (KV2204A, KV2304A, and KV2404A)
2.6.1 Front Panel
Figure 2-4 shows the front panel of the ServSwitch Wizard DVI DL, multihead versions. Table 2-2 describes its components.
2 3
1
Figure 2-4. Front panel.
Table 2-3. Front-panel components.
Number Component Description
1 COMPUTER button Press to change to the next computer channel.
2 Indicators The four indicators (KVM, SPK, USB1, USB2) show which peripherals are
switched to the current computer channel or (as you begin pressing the MODE
button) the peripherals that will be switched during the next press(es) of the
COMPUTER button.
NOTE: The multiscreen versions also include four additional indicators, labeled
V1 to V4, that show the video channels being switched.
The seven-segment numeric display indicates the computer channel that
is currently active.
3 MODE button Press to determine which peripherals should be switched to another computer
channel (will occur when you press the COMPUTER button).

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2.6.2 Back Panel
Figure 2-5 shows the back panel of the ServSwitch Wizard DVI DL. Table 2-4 describes its components.
10
9
711 11
4568910
910 12
10
9
11
11
Figure 2-5. Back panel.
Table 2-4. Back panel components.
Number Component Description
4 Barrel connector Power input or power supply connects here.
5 (2) USB Type A connectors Connect the console’s USB keyboard and mouse to these connectors.
6 3.5-mm RCA connector User console audio port: Connect optional speakers to this connector.
7 (4) DVI-I connectors Connect the console’s DVI-I monitor to this port.
8 RJ-45 port Options port: This top 10p10c port is used to update the internal firmware
when necessary by connectng to a computer.
9 (4) USB Type B connectors Connect to the computers’ keyboards/mice.
10 (4) 3.5-mm RCA connectors Computer audio port: Connect optional speakers to these connectors.
11 (16) DVI-I connectors Connect to the computers’ DVI-I monitors to enable multiple video streams
from each computer to be switched to up to four video monitors.
12 (2) USB Type A connectors Connect to USB 2.0 peripheral devices.

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Chapter 3: Installation
3. Installation
3.1 Mounting
There are two main mounting methods:
• Via the (4) supplied self-adhesive rubber feet
• Via optional rackmount brackets (KV2004A models only) using RMK2004
Rack brackets (KV2004A models only):
The optional brackets (plus four screws), enable the unit to be secured within a standard rack slot. See Figure 3-1.
Figure 3-1. Rackmount brackets (KV2004A only).
NOTE: Both the Wizard DVI DL unit and its power supply generate heat when in operation and will become warm to the touch.
Do not enclose them or place them in locations where air cannot circulate to cool the equipment. Do not operate the
equipment in ambient temperatures exceeding 104° F (40° C). Do not place the products in contact with equipment
whose surface temperature exceeds 104° F (40° C).
3.2 Connections
Connections do not need to be carried out in the order given within this guide, however, where possible connect the power
as a final step.
3.2.1 User Console
The ports on the user console side of the switch are where you attach the peripherals that will be shared between the computer
systems. Make sure that power is disconnected from the unit.
To connect peripherals to the user console:
1 Position your peripheral devices close together so their cables will easily reach.
2 Keyboard and mouse: Attach the leads from your USB keyboard and mouse to the USB connectors on the switch that are
specifically labeled with keyboard and mouse symbols. The keyboard and mouse will operate in any of the USB connectors,
however, True Emulation is not available on connectors labeled USB1 or USB2. See Figure 3-2.

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ServSwitch Wizard DVI DL
From USB keyboard
and mouse
Figure 3-2. Connecting the keyboard/mouse to the user console.
NOTE: The unit’s True Emulation feature will read the full characteristics of the keyboard and mouse and will present those to
each connected computer concurrently. This ensures that specialized keyboards and mice are fully supported.
3. USB devices. Where required, attach the leads from your USB peripherals to the USB connectors labeled USB1 and USB2. See
Figure 3-3.
From USB peripherals
Figure 3-3. Connecting USB peripherals to the user console.
4. Video monitor(s): DVI-I (integrated) video ports are used throughout to enable digital DVI and/or VGA analog (via adapter
cables) signals to be switched, as required.

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Chapter 3: Installation
Single-head units: Attach the lead from the video monitor to the DVI-I connector of the user console area. See Figure 3-4.
From video monitor
Figure 3-4. Connecting a video monitor to the user console.
NOTE: During initial powerup, the ServSwitch Wizard DVI DL unit will attempt to read the EDID information from the connected
display(s). See Section 3.2.6 for details. Some displays require the EDID function to be encoded manuallly (see Section
4.2.3 for details).
Multihead units: Attach the lead from each video monitor to a DVI-I connector of the user console area. See Figure 3-5.
NOTE: On the rear panel of the unit, the connectors at each horizontal level (V1 to V4) will be switched through to the user con-
sole DVI-I connector that is at the same level.
From video monitors
Figure 3-5. Connecting four video monitors to the user console.

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ServSwitch Wizard DVI DL
5. Audio: Where required, connect the lead from your speakers to the audio connector. See Figure 3-6.
From speakers
Figure 3-6. Connecting speakers to the user console.
3.2.2 Computer Systems
Each computer system is connected to the Wizard DVI DL unit using up to three cables.
To connect a computer system:
1. Make sure that power is disconnected from the Wizard DVI DL unit and the system to be connected.
2. Use a USB cable (Type A to Type B) to link a USB port on the computer system to the USB port of the required channel on the
rear of the unit.
3. If required, use a stereo audio link cable (3.5-mm jacks at either end) to link the speaker port on the computer system to the
audio port of the required channel on the rear of the unit. See Figure 3-7.
From the speaker port
on the computer
Figure 3-7. Connecting a computer unit to the Wizard DVI DL unit.

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Chapter 3: Installation
4. Single-head units: Use a DVI cable or a VGA to DVI-I adapter cable (if using analog signals) to link the video output of the com-
puter’s graphic port to the DVI-I port of the required channel on the rear of the unit. See Figure 3-8.
From the video port
on the computer
Figure 3-8. Connecting the video output to the DVI-I port.
NOTE: A combined DVI-D and USB (Type A to B) cable is also available for linking computers to the Wizard DVI DL unit.
During initial powerup, the Wizard DVI DL unit will attempt to read the EDID information from the connected display(s).
See Section 3.2.6 for details.
Multihead units: Use DVI or VGA to DVI-I adapter cables (if using analog signals) to link the video outputs of each computer to
the DVI-I ports on the rear of the unit (see Figure 3-9 and the note below).
Figure 3-9. Connecting mutliple video outputs to the DVI-I ports.
NOTE: On the rear panel of the unit, connectors belonging to the same channel are stacked vertically. The connectors at each
horizontal level (V1 to V4) will be switched through to the user console DVI-I connector which is at the same level.
See Figure 3-10.

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ServSwitch Wizard DVI DL
Figure 3-10. Vertically stacked connectors linked to the same channels.
3.2.3 Power In Connection
The Wizard DVI DL unit is supplied with either a 12.5 W (single-head version) or 20 W (multihead versions) power adapter. There
is no on/off switch on the unit, so operation begins as soon as the power adapter is connected.
To connect the power adapter:
1. Attach the output lead from the power adapter to the 5V socket on the rear panel of the unit. See Figure 3-11.
Figure 3-11. Connecting the power adapter.

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Chapter 3: Installation
2. Connect the IEC connector of the supplied country-specific power lead to the power adapter’s connector. See Figure 3-12.
Figure 3-12. Connecting the power lead to the power adapter’s connector.
3. Connect the power lead to a nearby power outlet.
NOTE: Both the unit and its power supply generate heat when in operation and will become warm to the touch. Do not enclose
them or place them in locations where air cannot circulate to cool the equipment. Do not operate the equipment in
ambient temperatures exceeding 104° F (40° C). Do not place the products in contact with equipment whose surface
temperature exceeds 104° F (40° C).
3.2.4 Switching Control by Computer
The OPTIONS port featured on every ServSwitch Wizard DVI DL enables an external serial input, typically from a computer,
to control the selection of the various channels. For more details about the necessary cable, see Appendix C.
Upon receipt of the correct code, the ServSwitch Wizard DVI DL switches immediately to the appropriate channel.
Connecting a computer for remote control:
The cable link from the computer needs to connect the transmit (TXD) line of the computer to the receive (RXD) input of the
Wizard DVI DL and also link the ground terminals (GND) of the two devices. See Appendix C for details.
To connect a computer remote control:
1. Insert the 8p8c or 10p10c connector of the cable to the OPTIONS port on the rear panel of the unit.
Figure 3-13. Connecting a computer remote control.
2. Connect the other end of the cable to a vacant serial port on the computer.

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Serial port parameter settings:
Make sure that the chosen serial port is configured as follows:
• Baud rate: 1200
• Data bits: 8
• Stop bit: 1
• Parity: None
For channel selection codes, see Table 3-1.
Table 3-1. Channel selection codes.
Number ASCII Hex Decimal
Channel 1 1 0x31 49
Channel 2 2 0x32 50
Channel 3 3 0x33 51
Channel 4 4 0x34 52
3.2.5 Synchronizing Multiple Units
ServSwitch Wizard DVI DL units can be connected together so that they operate in a synchronized manner. Thus, two KV2004A
units can be made to switch two video heads in a similar manner to an KV2204A. Additonally, two KV2204A (dual) units could
be made to resemble an KV2404A (quad), while two KV2404A units could be combined in order to switch up to eight video
heads simultaneously.
Whenever a ServSwitch Wizard DVI DL channel is switched, it sends an RS-232 command out on its serial interface (marked
OPTIONS on the rear panel). A ServSwitch Wizard DVI DL will switch its channel if it receives the same command on its serial
interface. Consequently, by linking the serial interfaces, a master unit may be made to automatically switch one or more slave
units as shown in Figure 3-14. Note that the synchronization cable deliberately does not have the transmit pin of the Slave End
connector linked to the receive pin of the Master End connector. To do so would cause the Slave unit to be able to switch the
Master unit. This would setup an endless cyclical switching sequence that would prevent the ServSwitch Wizard DVI DL devices
from operating correctly. For more details about the serial synchronization cables, see Appendix C.
Slave moni-
Slave
monitor Master
monitor
Computers fitted
with multiple
video heads
Master
ServSwitch Wizard
DVI DL
Slave
ServSwitch Wizard
DVI DL
Serial
synchronization cable
Figure 3-14. Synchronizing multiple units.