Kramer SWT3-41-U-T User manual

P/N: 2900-301682 Rev 1 www.kramerav.com
USER MANUAL
MODELS:
SWT3-41-U-T, EXT3-UE-R, EXT3-U-R,
ACC3-12-SP
4x1 USB Switcher Transmitter, USB
Receivers, 1:2 CAT Cable Splitter

Kramer Electronics Ltd.
SWT3-41-U-T –Contents
i
Contents
Introduction 1
Getting Started 1
Overview 2
Typical Applications 5
Defining SWT3-41-U-T 4x1 USB Switcher 6
Defining SWT3-41-U-T 6
Defining EXT3-UE-R 8
Defining EXT3-U-R 9
Defining ACC3-12-SP 10
Mounting SWT3-41-U-T, EXT3-UE-R, EXT3-U-R, and ACC3-12-SP 11
Mounting SWT3-41-U-T 11
Mounting EXT3-UE-R 12
Mounting EXT3-U-R 13
Mounting ACC3-12-SP 14
Connecting SWT3-41-U-T 15
Connecting the Output to a Balanced/Unbalanced Stereo Audio Acceptor 17
Connecting a Balanced/Unbalanced Stereo Audio Source to the Balanced Input 17
Connecting to Devices via RS-232 18
Operating and Controlling SWT3-41-U-T 19
Principles of Operation 19
Using Front Panel Buttons 22
Operating via Ethernet 22
Using Embedded Web Pages 26
Operation 29
Settings 30
Diagnostics 50
Administration 50
Viewing the About Page 56
Upgrading Firmware 57
Technical Specifications 58
SWT3-41-U-T 58
EXT3-UE-R 59
EXT3-U-R 60
ACC3-12-SP 61
Default Communication Parameters 62
Protocol 3000 63
Understanding Protocol 3000 63
Protocol 3000 Commands 64
Result and Error Codes 74

Kramer Electronics Ltd.
SWT3-41-U-T –Introduction
1
Introduction
Welcome to Kramer Electronics! Since 1981, Kramer Electronics has been providing a world
of unique, creative, and affordable solutions to the vast range of problems that confront the
video, audio, presentation, and broadcasting professional on a daily basis. In recent years, we
have redesigned and upgraded most of our line, making the best even better!
Getting Started
We recommend that you:
•Unpack the equipment carefully and save the original box and packaging materials for
possible future shipment.
•Review the contents of this user manual.
Go to www.kramerav.com/downloads/SWT3-41-U-T to check for up-to-date user manuals,
application programs, and to check if firmware upgrades are available (where appropriate).
Achieving Best Performance
•Use only good quality connection cables (we recommend Kramer high-performance,
high-resolution cables) to avoid interference, deterioration in signal quality due to poor
matching, and elevated noise levels (often associated with low quality cables).
•Do not secure the cables in tight bundles or roll the slack into tight coils.
•Avoid interference from neighboring electrical appliances that may adversely influence
signal quality.
•Position your Kramer SWT3-41-U-T away from moisture, excessive sunlight and dust.
Safety Instructions
Caution:
•This equipment is to be used only inside a building. It may only be connected to other
equipment that is installed inside a building.
•For products with relay terminals and GPI\O ports, please refer to the permitted rating
for an external connection, located next to the terminal or in the User Manual.
•There are no operator serviceable parts inside the unit.
Warning:
•Use only the power cord that is supplied with the unit.
•To ensure continuous risk protection, replace fuses only according to the rating
specified on the product label which is located on the bottom of the unit.
Recycling Kramer Products
The Waste Electrical and Electronic Equipment (WEEE) Directive 2002/96/EC aims to reduce
the amount of WEEE sent for disposal to landfill or incineration by requiring it to be collected

Kramer Electronics Ltd.
SWT3-41-U-T –Introduction
2
and recycled. To comply with the WEEE Directive, Kramer Electronics has made
arrangements with the European Advanced Recycling Network (EARN) and will cover any
costs of treatment, recycling and recovery of waste Kramer Electronics branded equipment on
arrival at the EARN facility. For details of Kramer’s recycling arrangements in your particular
country go to our recycling pages at www.kramerav.com/social-responsibility/environment.
Overview
Congratulations on purchasing your Kramer SWT3-41-U-T/ EXT3-UE-R/ EXT3-U-R/
ACC3-12-SP.
This section defines SWT3-41-U-T, EXT3-UE-R, EXT3-U-R and ACC3-12-SP.
SWT3-41-U-T 4x1 USB Switcher
The SWT3-41-U-T is a high−performance switcher transmitter with two USB−C and two
USB−B ports for USB host devices connection and plug and play host user auto−switching
experience based on active USB signal detection. The local and remote (over CAT−links)
connected USB peripherals, such as a room camera and microphone, are switchable for use
of the active USB host, for convenient online meeting participants operation.
SWT3-41-U-T provides exceptional quality, advanced and user-friendly operation, and flexible
control.
Exceptional Quality
•USB 3.1 Switching —USB 3.1 signals switching, enables high data–rate connection
between active USB host and meeting space USB 3.1 and 2.0 devices, such as 4K
camera, high–quality audio devices, and HID (Human Interface Devices) mouse or
keyboard devices.
•Comprehensive USB Extension –Integrated dual−link transmitters for USB and LAN
signals extension with 2–way power providing over extended–reach CAT twisted pair
copper infrastructures. The locally selected USB host is auto–connected to remotely
connected USB devices, employing either interrupt, bulk or isochronous USB 2.0
standard data transfer communication
•Cost-effective Dual-link USB Extension Deployment –Link−paired remote USB receivers
are flexibly connected via combined dual−link single CAT cable or dual independent
CAT cables connections, according to space extension deployment needs. Typically
used for long−distance connection of space remote two PTZ cameras, the combined
dual−link single CAT cable runs to a midspan−located CAT splitter that optimally
connects to receiver−connected cameras via the shortest independent CAT cables.
Advanced and User-friendly Operation
•Collaborative Online-meeting Switching –Controllable switching of online−session USB
host participants and space−deployed local and remote visual (such as camera) and
audible (such as microphones or headsets) USB peripherals, allows collaborative online
meeting and smooth content sharing operation among online meeting participants.
•BYOD Ease and Convenience —Connect any USB–C device as an online meeting

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SWT3-41-U-T –Introduction
3
participant, while providing the connected device with multiple concurrent capabilities of
USB 3.1 and Ethernet connection, USB–driven content sharing, and (if PD–2.0–capable)
up to 60 watts of power, all via a single USB–C cable connection only.
•Auto Switcher Ease of Use —Automatically connects the plugged host to the space
connected USB peripherals, according to user–configured preferences, such as last–
connected host.
•Simple and Flexible Control –Remote IP−controller connection, browser operation
webpage, local panel buttons, and remotely connected contact−closure buttons
triggering configurable operation functions, for easy and fully flexible USB host ports
selection, and switcher control.
Flexible Connectivity
•Flexible USB Connectivity –Wide Variety of USB peripheral and dual−role devices can
be extended including cameras, touch screens, smart boards, hard drives, game
controllers, audio devices, printers, scanners, or HID (Human Interface Devices) devices
such as a mouse or keyboard.
•Built-in Intelligent Control Gateway –Remote IP−driven intelligent control of local and
remote connected USB peripherals (such as PTZ cameras) and sensor devices via IP,
RS−232 or I/O. Eliminating the need for an external control gateway, this feature
reduces installation complexity and costs, to enable easy integration with control
systems, such as Kramer Control.
•Secured Connectivity —Standard IT–grade 802.1x authentication for secured IT LAN
connectivity operation.
•Comprehensive and Cost–effective Management —Local panel indication LEDs to
facilitate easy local maintenance and troubleshooting. Remote IP–driven device
firmware upgrade and management, via user–friendly embedded web pages and
optional whole site management system, ensure lasting and field proven deployment.
•Easy and Elegant Installation —PoE powering via LAN port connection, 2–way
powering to CAT–paired devices, and half 19” rack noise–free fan–cooled enclosure for
under table mounting, or side–by–side mounting of 2 units in a 1U rack space, for easy
and convenient deployment.
EXT3-UE-R USB Receiver
EXT3-UE-R is a comprehensive 2−way powering USB 2.0 receiver over extended−reach
twisted pair CAT cable. The receiver converts the transmitted CAT signal into USB 2.0,
Ethernet, RS−232 and audio signals.
EXT3-UE-R provides exceptional quality, advanced and user-friendly operation, and flexible
control:
Exceptional Quality
•Comprehensive USB Extension –Plug & play USB over CAT receiver for connecting a
remote USB host to the locally connected USB peripherals, employing either interrupt,
bulk or isochronous USB 2.0 standard data transfer communication.
•Simple USB Peripheral Control –Remote IP−driven or serial control, via the

Kramer Electronics Ltd.
SWT3-41-U-T –Introduction
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CAT−extended control signals of the connected USB peripherals, such as PTZ cameras
and soundbars by a remote LAN−connected control system (for example, Kramer
Control).
•Flexible USB Connectivity –Wide Variety of USB peripheral and dual−role devices can
be extended including cameras, touch screens, smart boards, hard drives, game
controllers, audio devices, printers, scanners, or HID (Human Interface Devices) devices
such as a mouse or keyboard.
Advanced and User-friendly Operation
•USB Peripheral Charging –Fast USB charging of connected USB peripherals when the
receiver is powered by a power supply, and standard USB charging when the receiver is
powered by the transmitter via CAT.
Flexible Connectivity
•Bidirectional Ethernet Extension –LAN interface data flows in both directions, allowing
network data transmission and connected−devices control.
•Bidirectional RS–232 Extension –Serial interface data flows in both directions, allowing
data transmission and device control.
•Audio Extension –The transmitted analog audio line signal from the remote audio
source is connected to the locally connected audio playing device.
•Comprehensive and Cost–effective Management –Local panel indication LEDs facilitate
easy local maintenance and troubleshooting. Remote management of connected
triggerable I/O devices (such as sensors), via user−friendly embedded web pages and
optional whole site management system, ensure lasting and field proven deployment.
•Easy Installation –Single twisted–pair cable for carrying signal and power wiring.
Compact TOOLS® fan–less enclosure for device–back mounting, or side–by–side
mounting of 3 units in a 1U rack space with the recommended rack adapter.
EXT3-U-R USB Receiver
EXT3-U-R is a comprehensive, extended-reach CAT extender kit for USB 2.0, RS-232 and
audio signals and 2-way powering over twisted pair. The EXT3-U-R transmitter converts the
USB input signal into a CAT signal. The EXT3-U-R receiver converts the transmitted CAT
signal into a USB signal.
EXT3-U-R provides exceptional quality, advanced and user-friendly operation, and flexible
control:
Exceptional Quality
•Comprehensive USB Extender –Plug & play USB extender kit for providing extended-
reach CAT signals and 2-way power over twisted pair copper infrastructures. A local
USB host is auto-connected to remote-connected USB devices employing either
interrupt, bulk or isochronous USB 2.0 standard data transfer communication.
•Flexible USB Connectivity –Wide Variety of USB peripheral devices can be extended
including cameras, touch screens, smart boards, hard drives, game controllers, audio
devices, printers, scanners, or HID (Human Interface Devices) devices such as a mouse
or keyboard. Dual role and OTG (On The Go) devices such as smart phones and

Kramer Electronics Ltd.
SWT3-41-U-T –Introduction
5
tablets, connected either to a transmitter–side USB host port or receiver-side USB
device port, can communication with a remote host or peripheral pairing device.
Advanced and User-friendly Operation
•Remote USB Charging –Fast USB charging of peripheral devices when the receiver is
powered by a power supply, and standard USB charging when the receiver is powered
by the transmitter via CAT.
Flexible Connectivity
•Bidirectional RS-232 Extension –Serial interface data flows in both directions, allowing
data transmission and device control.
•Audio Extension –Send an audio signal from an audio source connected to the
transmitter to an active audio playing device connected to the receiver.
•Cost-Effective Maintenance –Status LED indicators facilitate easy local maintenance
and troubleshooting.
•Easy Installation –Single twisted-pair cable for signal and power wiring. Compact
PicoTOOLS® fan-less enclosure for device–back mounting, or side-by-side mounting of
4 units in a 1U rack space with the recommended rack adapter.
ACC3-12-SP 1:2 CAT cable splitter
ACC3-12-SP is a passive splitter of one 4−pair signals−carrying CAT cable to two 2−pair
signals−carrying CAT cables, for optimized deployment of extension copper wiring
infrastructure.
Typical Applications
•Enterprise and education online meeting rooms.
•Upgrade AV meeting rooms to hybrid meeting rooms.
•Any solution with flexible connection of multiple USB hosts and local or remote room
peripherals.
Controlling your SWT3-41-U-T
Control your SWT3-41-U-T directly via the front panel push buttons, or:
•Via the IP commands transmitted by a controller and touch screen system, or a browser
using built-in user-friendly Web pages.
•By RS-232 serial commands transmitted by a touch screen system, PC, or a serial
controller.

Kramer Electronics Ltd.
SWT3-41-U-T –Defining SWT3-41-U-T 4x1 USB Switcher
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Defining SWT3-41-U-T 4x1 USB
Switcher
This section defines SWT3-41-U-T, EXT3-UE-R, EXT3-U-R and ACC3-12-SP.
Defining SWT3-41-U-T
Figure 1: SWT3-41-U-T 4x1 USB Switcher Front Panel
kjkj
Feature
Function
USB DEVICE USB A 3.1
Ports
Connect to the USB local peripheral devices (for example, a USB camera,
a soundbar, microphone and so on).
HOST on USB-C 3.1 ports (1
to 2)
Connect to a USB-C host (for example, a room PC) to communicate with
the USB devices (for example, a PTZ camera) that are connected to the
USB device ports and connect to the LAN.
For Host 1 only: Charges the connected host (that supports USB Power
Delivery 2.0) up to 60W when the device is powered via the optional 20V
DC power adapter. While charging, the charging icon (to the right of the
connector) becomes visible and lights orange.
HOST SELECT Buttons (1 to
4)
Press to select a host.
A+B CAT LED
LED Status
Indicates
Lights green
When dual CAT combined signals are sent over the
A+B port.
NET LED
LED Status
Indicates
Dark
No IP address acquired.
Lights green
A valid IP address has been acquired.
Flashes green for
60s
A means to identify the device in a system.
Flashes red/green
IP fallback address has been acquired.
Flashes red
IP address access has been blocked by security.
STATUS LED
LED Status
Indicates
Dark
Power is off
Lights white
PSU-powered on (only).
Lights yellow
PoE-powered on.
Lights green
Power is on and a source is connected.
Lights blue
Power is on, and a source and an acceptor are
connected.
Flashes white/yellow
Device stand-by mode is active.
1
2
3
4
5
6

Kramer Electronics Ltd.
SWT3-41-U-T –Defining SWT3-41-U-T 4x1 USB Switcher
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Figure 2: SWT3-41-U-T 4x1 USB Switcher Rear Panel
#
Feature
Function
HOST USB B 3.1 Connectors (3
to 4)
Connect to a USB host (for example, a room PC) to communicate with the
USB devices (for example, a PTZ camera) connected to USB device ports
on this device and connect to the LAN.
USB CAT
OUT PoC
◄►
A / A+B
Connect to a compatible CAT receiver (for example an EXT3-UE-R) or a
compatible CAT splitter (for example an ACC3-12-SP).
B
Connect to a compatible CAT receiver (for example an EXT3-UE-R).
USB DEVICE
USB-A 3.1 Ports
(2 to 3)
Connect to the USB local devices (for example, a USB camera, a
soundbar, microphone and so on).
USB-C 3.1 Port (4)
Connect to the USB local devices (for example, a USB camera, a
soundbar, microphone and so on).
Note that this port does not provide Power delivery 2.0.
I/O 2-pin Terminal Block
(S1, S2, G)
Connect to:
•Input-triggering devices (for example, remote buttons or sensors), OR
•Output-triggered devices (for example, remote alarm LED indication).
These GPIO ports may be configured as a digital input, digital output, or
analog input ports.
RS-232 3-pin Terminal Block
Connector
(G, Rx, Tx)
Connect to:
•RS-232 controlled device (for example, a PTZ USB camera) for its
remote IP control by a controller (for example, an SL-240C), OR
•RS-232 control port of a controller (for example, an SL-240C) for
extension via a CAT port, OR
•PC RS-232 port for controlling the device.
LAN PoE◄ RJ-45 Connector
Connect to LAN. The device accepts power from the LAN port (PoE).
A LAN-enabled connection on the selected USB-C port is LAN-switched via
this LAN port.
12/20V DC Power Connector
Use the included +12V 2A connector for powering the unit, or a +20V DC
6A power adapter (purchased separately) for also powering and charging
the source device connected to the USB-C HOST ports on the front panel.
RESET Recessed Button
Press for about 5 seconds to reset SWT3-41-U-T to its factory settings.
Press for 2-3 seconds for device reset.
AUDIO IN 5-pin Terminal Block
Connector
Connect to a balanced, stereo audio source (for example, from the server)
for extension via the CAT ports.
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8
9
10
11
12
13
14
15
16
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Kramer Electronics Ltd.
SWT3-41-U-T –Defining SWT3-41-U-T 4x1 USB Switcher
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Defining EXT3-UE-R
Figure 3: EXT3-UE-R USB Receiver Front/Rear Panel
#
Feature
Function
USB 2 Type A Ports (1 to 3)
Connect to USB local devices (for example, a USB camera, a
soundbar, microphone etc.).
Ports provide standard USB device charging.
USB-C Port (4)
Connect to USB local devices (for example, a USB camera, a
soundbar, microphone etc.). Port provides standard USB
device charging.
Note: Port does not provide Power Delivery 2.0 charging.
LINK LED
Flashes blue when a link is established.
ON LED
Lights green when locally powered by the power adapter.
Lights orange when powered by PoC.
CAT IN PoC RJ-45 Connector
Connect to:
•One of the USB CAT OUT PoC ports on the
SWT3-41-U-T OR,
CAT A or CAT B on the ACC3-12-SP 1:2 CAT cable splitter
which can be connected to the SWT3-41-U-T.
AUDIO OUTPUT 5-pin Terminal Block
Connector (L+, L-, G)
Connect to a balanced analog stereo audio line acceptor.
I/O 2-pin Terminal Block (S1 to S2)
Connect to:
•Input-triggering devices (for example, remote buttons
or sensors), OR
•Output-triggered devices (for example, remote alarm
LED indication).
These GPIO ports may be configured via paired SWT3-41-U-T
embedded webpages, as digital input or output ports.
RS-232 3-pin Terminal Block (G, Rx, Tx)
Connect to an RS-232 controlled device (for example, the
connected PTZ USB camera) to be controlled via a controller
(for example, SL-240C) which is IP-connected to a paired
SWT3-41-U-T.
LAN PoE RJ-45 Connector
Connect to LAN or to an IP-controlled device (for example, the
connected PTZ USB camera). The device accepts power from
the LAN port.
SETUP 2-way DIP-switch
Set the HDBT Range Mode.
Note: All changes in DIP-Switches apply immediately.
DIP-switch
Name
DIP-switch
#
DIP-Switch
State
State
Description
RS-232 MODE
1
OFF (up)
default
Programming
mode
ON (down)
Extension
mode
For future use
2
Mandatory
OFF (up)
12V DC Power Connector
Connect to the power adapter.
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19
20
21
22
23
24
25
26
27
28

Kramer Electronics Ltd.
SWT3-41-U-T –Defining SWT3-41-U-T 4x1 USB Switcher
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Defining EXT3-U-R
Figure 4: EXT3-U-R USB Receiver Front/Rear Panel
#
Feature
Function
LINK LED
Flashes blue when a link is established.
AUDIO OUT 3.5mm Mini
Jack
Connect to an unbalanced stereo audio acceptor.
USB 2 Type A Ports (1 to
4)
Connect to USB devices.
Connect the receiver directly to the power adapter in order to charge
USB devices.
ON LED
Lights green when locally powered by the power adapter. Lights orange
when powered by PoC.
LINK IN RJ-45 Connector
Connect to the LINK OUT port on the EXT3-UE-R.
PROG (Tx, Rx)
5-pin Terminal Block Connector (with common G pin)
RS-232 (Rx, Tx)
Press to toggle between a blank screen (blue or black) and the program
display.
The BLANK button can be programmed to mute the audio signal at the
same time.
12V DC Power
Connector
Connect to the power adapter.
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30
31
32
33
34
35
36

Kramer Electronics Ltd.
SWT3-41-U-T –Defining SWT3-41-U-T 4x1 USB Switcher
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Defining ACC3-12-SP
Figure 5: ACC3-12-SP 1:2 CAT cable splitter Front/Rear Panel
#
Feature
Function
CAT A+B RJ-45 Port
Connect to a compatible CAT transmitter (for example an SWT3-41-U-T)
so send combined signals over the A+B port.
CAT A RJ-45 Port
Connect to a compatible CAT receiver (for example an EXT3-UE-R,
EXT3-U-R).
CAT B RJ-45 Port
Connect to a compatible CAT receiver (for example an EXT3-UE-R,
EXT3-U-R).
37
38
39

Kramer Electronics Ltd.
SWT3-41-U-T –Mounting SWT3-41-U-T, EXT3-UE-R, EXT3-U-R, and ACC3-12-SP
11
Mounting SWT3-41-U-T,
EXT3-UE-R, EXT3-U-R, and
ACC3-12-SP
Mounting SWT3-41-U-T
This section provides instructions for mounting SWT3-41-U-T. Before installing, verify that the
environment is within the recommended range:
•Operation temperature –0to 40C (32 to 104F).
•Storage temperature –-40to +70C (-40 to +158F).
•Humidity –10% to 90%, RHL non-condensing.
Caution:
•Mount SWT3-41-U-T before connecting any cables or power.
Warning:
•Ensure that the environment (e.g., maximum ambient temperature & air flow) is
compatible for the device.
•Avoid uneven mechanical loading.
•Appropriate consideration of equipment nameplate ratings should be used for avoiding
overloading of the circuits.
•Reliable earthing of rack-mounted equipment should be maintained.
•Maximum mounting height for the device is 2 meters.
Mount SWT3-41-U-T in a rack:
•Use the recommended rack adapter
(see www.kramerav.com/product/SWT3-41-U-T).
Mount SWT3-41-U-T on a surface using one of the following
methods:
•Attach the rubber feet and place the unit on a flat surface.
•Fasten a bracket (included) on each side of the unit and attach it to
a flat surface. For more information go to
www.kramerav.com/downloads/SWT3-41-U-T.

Kramer Electronics Ltd.
SWT3-41-U-T –Mounting SWT3-41-U-T, EXT3-UE-R, EXT3-U-R, and ACC3-12-SP
12
Mounting EXT3-UE-R
This section provides instructions for mounting EXT3-UE-R. Before installing, verify that the
environment is within the recommended range:
•Operation temperature –0to 40C (32 to 104F).
•Storage temperature –-40to +70C (-40 to +158F).
•Humidity –10% to 90%, RHL non-condensing.
•EXT3-UE-R must be placed upright in the correct horizontal position.
Warning:
•Ensure that the environment (e.g., maximum ambient temperature & air flow) is
compatible for the device.
•Avoid uneven mechanical loading.
•Appropriate consideration of equipment nameplate ratings should be used for avoiding
overloading of the circuits.
•Reliable earthing of rack-mounted equipment should be maintained.
Mounting EXT3-UE-R
Mount device before connecting any cables or power.
To mount EXT3-UE-R
Mount the unit in a rack using the recommended rack adapter
(see www.kramerav.com/product/EXT3-UE-R)
To mount the EXT3-UE-R on a table or shelf:
•Attach the rubber feet and place the unit on a flat surface.
•Fasten a bracket (included) on each side of the unit and attach it to
a flat surface.
For more information go to www.kramerav.com/downloads/EXT3-UE-Rr

Kramer Electronics Ltd.
SWT3-41-U-T –Mounting SWT3-41-U-T, EXT3-UE-R, EXT3-U-R, and ACC3-12-SP
13
Mounting EXT3-U-R
This section provides instructions for mounting EXT3-U-R. Before installing, verify that the
environment is within the recommended range:
•Operation temperature –0to 40C (32 to 104F).
•Storage temperature –-40to +70C (-40 to +158F).
•Humidity –10% to 90%, RHL non-condensing.
Caution:
•Mount EXT3-U-R before connecting any cables or power.
Warning:
•Ensure that the environment (e.g., maximum ambient temperature & air flow) is
compatible for the device.
•Avoid uneven mechanical loading.
•Appropriate consideration of equipment nameplate ratings should be used for avoiding
overloading of the circuits.
•Reliable earthing of rack-mounted equipment should be maintained.
•Maximum mounting height for the device is 2 meters.
Mount EXT3-U-R in a rack:
•Use the recommended rack adapter
(see www.kramerav.com/product/EXT3-U-R).
Mount EXT3-U-R on a surface using one of the following methods:
•Attach the rubber feet and place the unit on a flat surface.
•Fasten a bracket (included) on each side of the unit and attach it to
a flat surface. For more information go to
www.kramerav.com/downloads/EXT3-U-R.

Kramer Electronics Ltd.
SWT3-41-U-T –Mounting SWT3-41-U-T, EXT3-UE-R, EXT3-U-R, and ACC3-12-SP
14
Mounting ACC3-12-SP
This section provides instructions for mounting ACC3-12-SP. Before installing, verify that the
environment is within the recommended range:
•Operation temperature –0to 40C (32 to 104F).
•Storage temperature –-40to +70C (-40 to +158F).
•Humidity –10% to 90%, RHL non-condensing.
Caution:
•Mount ACC3-12-SP before connecting any cables.
Warning:
•Ensure that the environment (e.g., maximum ambient temperature) is compatible for the
device.
•Avoid uneven mechanical loading.
•Reliable earthing of rack-mounted equipment should be maintained.
Mount ACC3-12-SP in a rack:
•Use the recommended rack adapter
(see www.kramerav.com/product/ACC3-12-SP).
Mount ACC3-12-SP on a surface using one of the following
methods:
•Attach the rubber feet and place the unit on a flat surface.
•Fasten a bracket (included) on each side of the unit and attach it to
a flat surface. For more information go to
www.kramerav.com/downloads/ACC3-12-SP.

Kramer Electronics Ltd.
SWT3-41-U-T –Connecting SWT3-41-U-T
15
Connecting SWT3-41-U-T
Always switch off the power to each device before connecting it to your SWT3-41-U-T. After
connecting your SWT3-41-U-T, connect its power and then switch on the power to each
device.
Figure 6: Connecting to the SWT3-41-U-T
In (Figure 6) SWT3-41-U-T is connected to dual receivers using a CAT splitter to save CAT
cables wiring expenses. If not CAT splitter is required, SWT3-41-U-T can connect directly to
either one of the required receivers EXT3-UE-R and EXT3-U-R based on needs.
To connect SWT3-41-U-T as illustrated in the example in Figure 6:
▪Connect the HOST USB-C 3.1 port to a laptop.
▪Connect the HOST USB-B 3.1 port to a room PC.
▪Connect the local USB DEVICE ports , , to USB devices (for example,
USB DEVICE 2 to a mouse, USB DEVICE 3 to a keyboard and USB DEVICE 4 to a
hands-free mic).
▪Connect a balanced stereo audio source (for example, media player) to the AUDIO
IN 5-pin terminal block connector .
1. Connect the USB CAT OUT A / A+B PoC RJ-45 port on the SWT3-41-U-T , to the
CAT A+B Input RJ-45 port on the ACC3-12-SP.
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2. Connect the CAT A RJ-45 Output Ports on the ACC3-12-SP , to the LINK IN RJ-45
ports & on the EXT3-UE-R and EXT3-U-R, correspondently.
3. Connect the Outputs on EXT3-U-R as follows:
▪Connect the USB DEVICE ports to USB devices (for example, USB DEVICE 1 to a
Touch TV, USB DEVICE 2 to a PTZ camera and USB DEVICE 3 to a smartboard).
▪Connect the AUDIO OUT 3.5mm mini jack to an unbalanced stereo audio
acceptor (for example, active speakers).
4. Connect the Outputs on EXT3-UE-R as follows:
▪Connect the USB DEVICE ports to USB devices (for example, USB 1 to a touch TV,
USB 3 to a PTZ camera).
▪Connect the AUDIO OUTPUT 5-pin terminal block connector to a balanced
stereo audio acceptor (for example, active speakers).
▪Connect the I/O 2-pin terminal block connector to a triggering and/or triggered
GPIO acceptor (for example, I/O 2 to occupancy detector) or a remote button (for
example, a host selector).
5. Control the devices:
▪On the SWT3-41-U-T, connect a controller (for example, SL-240C room controller) to
the LAN PoE◄ RJ-45 port , or to the RS-232 port .
▪On EXT3-U-R receiver side, connect the RS-232 port to a PTZ camera (send
serial commands from SL-240C to the camera via receiver RS-232 port).
▪On EXT3-U-R receiver side, connect the LAN PoE◄ RJ-45 port to a PTZ camera
(send IP commands from SL-240C to the camera via receiver LAN port).
6. When not PoE powered, connect the power adapter to SWT3-41-U-T and to the mains
electricity.
w
To charge the device that is connected to the host USB-C port, you need to use a power
adapter for powering the SWT3-41-U-T switcher transmitter.
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Connecting the Output to a Balanced/Unbalanced
Stereo Audio Acceptor
The following are the pinouts for connecting the output to a balanced or unbalanced stereo
audio acceptor:
Figure 7: Connecting to a Balanced Stereo Audio
Acceptor
Figure 8: Connecting to an Unbalanced Stereo Audio
Acceptor
Connecting a Balanced/Unbalanced Stereo Audio
Source to the Balanced Input
The following are the pinouts for connecting a balanced or unbalanced stereo audio source to
the balanced input:
Figure 9: Connecting a Balanced Stereo Audio
Source to the Balanced Input
Figure 10: Connecting an Unbalanced Stereo Audio
Source to the Balanced Input

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Connecting to Devices via RS-232
You can connect to SWT3-41-U-T/ EXT3-UE-R/ EXT3-U-R via an RS-232 connection using,
for example, a PC.
SWT3-41-U-T, for example, features an RS-232 3-pin terminal block connector allowing the
RS-232 to control SWT3-41-U-T.
Connect the RS-232 terminal block on the rear panel of SWT3-41-U-T to a PC/controller, as
follows:
From the RS-232 9-pin D-sub serial port connect:
•Pin 2 to the TX pin on the SWT3-41-U-T RS-232 terminal
block
•Pin 3 to the RX pin on the SWT3-41-U-T RS-232 terminal
block
•Pin 5 to the G pin on the SWT3-41-U-T RS-232 terminal
block
RS-232 Device
SWT3-41-U-T