ATEN CS261 User manual

DVI Computer Sharing Device
CS261 / CS261TK
User Manual
www.aten.com

CS261 / CS261TK User Manual
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EMC Information
FEDERAL COMMUNICATIONS COMMISSION INTERFERENCE
STATEMENT: This equipment has been tested and found to comply with the
limits for a Class A digital device, pursuant to Part 15 of the FCC Rules. These
limits are designed to provide reasonable protection against harmful
interference when the equipment is operated in a commercial environment.
This equipment generates, uses, and can radiate radio frequency energy and, if
not installed and used in accordance with the instruction manual, may cause
harmful interference to radio communications. Operation of this equipment in
a residential area is likely to cause harmful interference in which case the user
will be required to correct the interference at his own expense.
The device complies with Part 15 of the FCC Rules. Operation is subject to the
following two conditions: (1) this device may not cause harmful interference,
and (2) this device must accept any interference received, including
interference that may cause undesired operation.
FCC Caution: Any changes or modifications not expressly approved by the
party responsible for compliance could void the user's authority to operate this
equipment.
Warning: Operation of this equipment in a residential environment could
cause radio interference.
KCC Statement
RoHS
This product is RoHS compliant.

CS261 / CS261TK User Manual
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User Information
Online Registration
Be sure to register your product at our online support center:
Telephone Support
For telephone support, call this number:
User Notice
All information, documentation, and specifications contained in this manual
are subject to change without prior notification by the manufacturer. The
manufacturer makes no representations or warranties, either expressed or
implied, with respect to the contents hereof and specifically disclaims any
warranties as to merchantability or fitness for any particular purpose. Any of
the manufacturer's software described in this manual is sold or licensed `as is'.
Should the programs prove defective following their purchase, the buyer (and
not the manufacturer, its distributor, or its dealer), assumes the entire cost of all
necessary servicing, repair and any incidental or consequential damages
resulting from any defect in the software.
The manufacturer of this system is not responsible for any radio and/or TV
interference caused by unauthorized modifications to this device. It is the
responsibility of the user to correct such interference.
The manufacturer is not responsible for any damage incurred in the operation
of this system if the correct operational voltage setting was not selected prior
to operation. PLEASE VERIFY THAT THE VOLTAGE SETTING IS
CORRECT BEFORE USE.
International http://eservice.aten.com
International 886-2-8692-6959
China 86-400-810-0-810
Japan 81-3-5615-5811
Korea 82-2-467-6789
North America 1-888-999-ATEN ext 4988
1-949-428-1111

CS261 / CS261TK User Manual
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Package Contents
CS261
1 CS261 2-Port DVI Computer Sharing Device
1 Custom KVM Cable Set (1.8m)
1 Power Adapter
1 User Instructions*
CS261TK
1 CS261 2-Port DVI Computer Sharing Device
1 Custom KVM Cable Set (1.8m)
1 Power Adapter
1 2XRT-0015G KVM over IP Access Control Box
1 User Instructions* (2XRT-0015G KVM over IP Access Control Box only)
Note: 1. * Features may have been added to the KVM over IP console station
since the user instructions were created. Please visit our website to
download the most up-to-date version of the user manual.
2. Make sure that all of the components are present and in good order. If
anything is missing or was damaged in shipping, contact your dealer.
3. Read this manual thoroughly and follow the installation and operation
procedures carefully to prevent any damage to the unit, and/or any of
the devices connected to it.
© Copyright 2019 ATEN® International Co., Ltd.
Manual Part No. PAPE-0370-AT1G
Manual Date: 2019-12-11
ATEN and the ATEN logo are registered trademarks of ATEN International Co., Ltd. All rights reserved.
All other brand names and trademarks are the registered property of their respective owners.

CS261 / CS261TK User Manual
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Contents
EMC Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ii
RoHS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ii
User Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .iii
Online Registration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .iii
Telephone Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .iii
User Notice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .iii
Package Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iv
About this Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii
Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .viii
Product Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .viii
4. Introduction
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
CS261 / CS261TK. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
2XRT-0015G KVM over IP Access Control Box . . . . . . . . . . . . . . . . . .3
Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Console . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Computer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
KVM Cables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Video Interface Converters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Operating Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
CS261 / CS261TK Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
CS261 / CS261TK Rear Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2XRT-0015G KVM over IP Access Control Box . . . . . . . . . . . . . . . . . .8
5. Hardware Setup
Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Installation Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
6. Basic Operation
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Pushbutton Console Mode Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Hotkey Console Mode Selection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
2XRT-0015G KVM over IP Access Control Box . . . . . . . . . . . . . . . . . . . . 12
LED statuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
7. Operation
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Auto Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Private Mode (Console 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

CS261 / CS261TK User Manual
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Screen Saver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
DIP Switch Settings Table. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Manual Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Timeout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Multiple EDID Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Invoke Hotkey Settings Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Hotkey Settings Mode Summary Table. . . . . . . . . . . . . . . . . . . . . . . . 19
Keyboard Emulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
8. The Firmware Upgrade Utility
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Downloading the Firmware Upgrade Package . . . . . . . . . . . . . . . . . . 23
Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Starting the Upgrade . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Upgrade Succeeded . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Upgrade Failed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Firmware Upgrade Recovery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
9. Appendix
Safety Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
International . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
North America . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
CS261 / CS261TK Factory Default Settings . . . . . . . . . . . . . . . . . . . . . . 34
Operation Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Limited Warranty. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

CS261 / CS261TK User Manual
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About this Manual
This User Manual is provided to help you get the most from your CS261 /
CS261TK. It covers all aspects of installation, configuration and operation. An
overview of the information found in the manual is provided below.
Chapter 1, Introduction, introduces you to the CS261 / CS261TK system.
Its purpose, features and benefits are presented, and its front and back panel
components are described.
Chapter 2, Hardware Setup, describes how to set up your installation. The
necessary steps, from basic to advanced setups, are provided.
Chapter 3, Basic Operation, explains the fundamental concepts involved
in operating the CS261 / CS261TK.
Chapter 4, Operation, explains the CS261 / CS261TK’s operating and
hotkey settings mode as well as the EDID selection feature.
Chapter 5, The Firmware Upgrade Utility, explains how to use this
utility to upgrade the CS261 / CS261TK
firmware to the latest available
version.
Appendix, provides specifications and other technical information regarding
the CS261 / CS261TK.
Note:
Read this manual thoroughly and follow the installation and operation
procedures carefully to prevent any damage to the unit or any connected
devices.
ATEN regularly updates its product documentation for new features and
fixes. For an up-to-date CS261 / CS261TK documentation, visit
......................... http://www.aten.com/global/en/

CS261 / CS261TK User Manual
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Conventions
This manual uses the following conventions:
Product Information
For information about all ATEN products and how they can help you connect
without limits, visit ATEN on the Web or contact an ATEN Authorized
Reseller. Visit ATEN on the Web for a list of locations and telephone numbers:
Monospaced Indicates text that you should key in.
[ ] Indicates keys you should press. For example, [Enter] means to
press the Enter key. If keys need to be chorded, they appear
together in the same bracket with a plus sign between them:
[Ctrl+Alt].
1. Numbered lists represent procedures with sequential steps.
♦Bullet lists provide information, but do not involve sequential steps.
→Indicates selecting the option (on a menu or dialog box, for
example), that comes next. For example, Start
→ Run means to
open the Start menu, and then select Run.
Indicates critical information.
International http://www.aten.com
North America http://www.aten-usa.com

1
Chapter 1
Introduction
Overview
The CS261 / CS261TK is a DVI micro-processor controlled computer sharing
solution that offers a multi-user/single-tasking experience and enables two
users to share the use of a single USB computer from two separate consoles
(monitor, USB keyboard, USB mouse, speaker and microphone). The CS261 /
CS261TK is ideal for small office environments. All programs, files and
resources on any connected computer can be easily accessed and shared by
both users without the additional complexity and expense of setting up a
network environment. Users are able to operate computers on the installation
one by one while, for additional security, the other console's video and audio
output is optionally disabled.The CS261 / CS261TK even provides a
convenient OSD (On Screen Display) function that allows either of the
Consoles to access any computer connected to the system by means of an on
screen, console status driven interface.
Setup is fast and easy; plugging cables into their appropriate ports is all that is
entailed. There is no software to configure, so there is no need to get involved
in complex software installation routines or be concerned with incompatibility
problems. Because the CS261 / CS261TK intercepts keyboard input directly,
it works on any hardware platform and with all operating systems.
Responding to the growing use of audio input/output in the workstation space,
the CS261 / CS261TK has been designed with built in microphone and speaker
support, as well.
CS261TK is CS261 that bundled with KVM over IP Access Control Box. The
2XRT-0015G KVM over IP Access Control Box allows users to enable or
disable remote over IP control privilege by simply pressing a control button.
It’s fast and easy to set up the 2XRT-0015G. Simply plug the 2XRT-0015G’s
cables to the CS261 / CS261TK. There is no need to install software or
configure devices - just plug and play,.
In addition, the cable length of the 2XRT-0015G reaches 5 meters, enabling
connection to the transmitter over longer distances for more flexible
installation.

CS261 / CS261TK User Manual
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Features
CS261 / CS261TK
The CS261 / CS261TK is a DVI computer sharing device that expands
your control so that two users can easily share one computer using one of 2
modes: auto and manual
Superior video quality - supports resolutions up to 1080p, 1920x1200 and
4K2K@30Hz
1
Supports 2.1 channel stereo sound and high definition audio
2
HDCP compliant - supports HDCP-enabled devices
Multiple EDID selection - selects optimum EDID settings for smooth
power-up and highest quality display
Supports RS232 serial commands - for switching operation and system
configuration
Console selection via the pushbutton, hotkey and RS232 commands -
easily access the computer using any of these options
Screen Saver feature - prevents anyone from seeing the screen's display
after a period of inactivity
Mac/Sun keyboard support and emulation - users can use PC keyboards
with consoles and still work within Macintosh/Sun platforms
3
Multilingual keyboard mapping - supports English, Japanese, French and
German keyboards
Multiplatform support - you can use the CS261 / CS261TK whether you
are running a Windows, Linux, Mac or Sun system
Upgradeable firmware through computer’s USB port - stay current with
the latest functionality improvements and updates with upgradeable
firmware
No software required - eliminate incompatibility and installation issues
along with the need to configure software
Note: 1. 4K2K@30Hz is supported when using a DVI to HDMI cable.
2. High definition audio can be converted using a DVI to HDMI
cable.
3. PC keyboard combinations emulate Mac/Sun keyboards.

1. Introduction
3
2XRT-0015G KVM over IP Access Control Box
Users at the Tx local console can enable / disable Rx control privilege by
simply pressing a control button
Plug and play - no software installation required on either side
USB bus-powered design - no external power adapter required
Easy to operate
Cable length reaches 5m for more flexible installation
Note: 2XRT-0015G KVM over IP Access Control Box only comes in the
CS261TK package.

CS261 / CS261TK User Manual
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Requirements
Console
A DVI monitor capable of the highest resolution that you will be using on
any computer in the installation
A USB Keyboard and a USB Mouse
Speakers and microphone (optional)
Computer
The following equipment must be installed on the computer that is to be
connected to the system:
A DVI video port
USB Type A port
Speaker and microphone ports (optional)
Cables
Use of substandard cables may damage the connected devices or degrade
overall performance. For optimum signal integrity and to simplify the layout,
we strongly recommend that you use the following high quality Custom Cable
sets:
KVM Cables
2L-7D02U: 1.8m
2L-7D03U: 3.0m
2L-7D05U: 5.0m
Video Interface Converters
2A-127G: DVI to HDMI
2A-128G: HDMI to DVI

1. Introduction
5
Operating Systems
Supported operating systems are shown in the table below:
OS Version
Windows 2000 and higher
Linux RedHat 6.0 and higher
SuSE 8.2 and higher
UNIX FreeBSD 3.51 and higher
Sun Solaris 8 and higher
Novell Netware 5.0 and higher
Mac OS 9 and higher

CS261 / CS261TK User Manual
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Components
CS261 / CS261TK Front Panel
*In Auto Mode, when neither console is accessing the computer, both Console
LEDs are illuminated.
No. Component Description
1 MANUAL/
AUTO
Selection
Button
This button is used to switch between Manual and Auto
Modes. The default is Auto Mode. Repeatedly pressing the
button cycles through the modes in the following order: Auto
Mode -> Console 1 (Manual) -> Console 2 (Manual) -> Auto
Mode.
2 C1 LED* Lights when Console 1 accesses the computer. Turns off
when Console 2 accesses the computer.
3 C2 LED* Lights when Console 2 accesses the computer. Turns off
when Console 1 accesses the computer.
4 MANUAL LED Lights to indicate that the CS261 / CS261TK is set to Manual
Mode. In Auto Mode the LED does not illuminate.

1. Introduction
7
CS261 / CS261TK Rear Panel
No. Component Description
1 Serial Port Use an RJ-11 to RS232 cable to allow RS232 functions.
2 Reset Button Press this semi-recessed button to reset the system.
3 Power Jack The power adapter cable plugs in here.
4 DIP Switch This is a 4-pin DIP switch. Use it to enable/disable RS232
commands, screen saver, private mode and privileged user
settings.
5 PC Port The KVM cables that attach to your computers plug in here
(see Cables, page 4, for a list of compatible KVM cables).
The CS261 / CS261TK’s firmware may also be upgraded
connected to this port.
6 Console 1 Ports The cable from the DVI monitor, speakers, microphone,
USB keyboard and mouse of Console 1 plugs in here.
7 Console 2 Ports The cable from the DVI monitor, speakers, microphone,
USB keyboard and mouse of Console 2 plugs in here.

CS261 / CS261TK User Manual
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2XRT-0015G KVM over IP Access Control Box
Note: 2XRT-0015G KVM over IP Access Control Box only comes in the
CS261TK package.
No. Component Description Indication
1 Control Button / LED Press the button to enable or disable
remote over IP control access.
Lights red
2 USB Connector Connects to a USB port to power on
the device.
3 PS/2 Connector Connects to the PS/2 port for control
access.
4 RJ-11 Connector Connects to the RJ-11 port for control
access.
5 RJ-232 Connector Connects to the RS-232 port for
control access.
42
3
5
1

9
Chapter 2
Hardware Setup
Installation
1. Connect the DVI connector on the KVM cable to the Computer Port on the
CS261 / CS261TK.
2. Connect the DVI connector on the KVM cable to the DVI video output
port on the computer. Plug the USB connector into any available USB
port.
3. Plug the keyboard, mouse and monitor for the console that you want to
designate as Console 1 into the Console 1 port.
4. Repeat step 3 for Console 2.
5. Plug the power adapter into the AC power source; plug the power adapter
into the power jack on the CS261 / CS261TK.
6. Plug the RJ-11 connector of the 2XRT-0015G to the Firmware Upgrade
Port on the rear side of the CS261TK.
Note: This step is only for CS261TK that includes 2XRT-0015G KVM
over IP Access Control Box in the CS261TK package. If your
package is CS261, you can skip this step.
7. Power on the computer and monitors.
Note: The mouse and keyboard connectors are USB 1.1 ports.
1. Important safety information regarding the placement of this
device is provided on page 29. Please review it before proceeding.
2. Make sure that power to all the devices you will be connecting up
have been turned off. You must unplug the power cords of any
computers that have the Keyboard Power On function.

CS261 / CS261TK User Manual
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Installation Diagram

11
Chapter 3
Basic Operation
Overview
As a computer sharing device, the CS261 / CS261TK provides basic access via
two different console modes: Console 1 Mode and Console 2 Mode. The
CS261 / CS261TK provides three convenient methods of selecting console
modes: Pushbutton Console Mode Selection – press the pushbutton on the front
panel, Hotkey Console Mode Selection – enter combinations from the
keyboard, and RS232 serial control – send RS232 commands.*
Note: Please refer to the CS261 / CS261TK RS232 Command User Manual
for further details.
For CS261TK that comes with the CS261 package including the 2XRT-0015G
KVM over IP Access Control Box. The 2XRT-0015G KVM over IP Access
Control Box allows users to enable or disable remote over IP control privilege
by simply pressing a control button.
Pushbutton Console Mode Selection
Press the pushbutton on the front panel repeatedly to bring the focus to the
desired console mode as follows:
Auto Mode → Manual Mode (Console 1) → Manual Mode (Console 2) →
Auto Mode.
The LED lights indicate that the console is accessing the computer.
Hotkey Console Mode Selection
Selecting console modes via hotkey works only within Manual Mode (Console
1 and Console 2 mode). Press the Scroll Lock key twice and then the Enter key
to switch from Console 1 to Console 2.
Note: If using [Scroll Lock] conflicts with other programs, [Ctrl] can be used
instead, e.g. [Ctrl][Ctrl][Enter].

CS261 / CS261TK User Manual
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2XRT-0015G KVM over IP Access Control Box
Note: 2XRT-0015G KVM over IP Access Control Box only comes in the
CS261TK package.
2XRT-0015G KVM over IP Access Control Box is a control button accessory
to enable / disable remote KVM over IP access.
LED statuses
Button Status LED Function
Pressed Red Light Disable remote access
Released Dim Enable remote access