Kramer SWT3-41-U User manual

P/N: 2900-301686 Rev 1 www.kramerav.com
USER MANUAL
MODEL:
SWT3-41-U
4x1 USB Switcher

Kramer Electronics Ltd.
SWT3-41-U –Contents
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Contents
Introduction 1
Getting Started 1
Overview 2
Typical Applications 3
Defining SWT3-41-U 4x1 USB Switcher 4
Mounting SWT3-41-U 6
Connecting SWT3-41-U 7
Connecting to SWT3-41-U via RS-232 8
Operating and Controlling SWT3-41-U 9
Principles of Operation 9
Using Front and Rear Panel Buttons 10
Operating via Ethernet 10
Using Embedded Web Pages 14
Operations 17
Settings 18
Diagnostics 35
Administration 36
Viewing the About Page 41
Upgrading Firmware 42
Technical Specifications 43
Default Communication Parameters 44
Protocol 3000 45
Understanding Protocol 3000 45
Protocol 3000 Commands 46
Result and Error Codes 56

Kramer Electronics Ltd.
SWT3-41-U –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 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 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

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SWT3-41-U –Introduction
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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/il/quality/environment.
Overview
Congratulations on purchasing your Kramer SWT3-41-U 4x1 USB Switcher. SWT3-41-U is a
high−performance switcher with two USB−C and two USB−B ports for USB host devices
connectionתand plug and play host user auto−switching experience based on active USB
signal detection. The four 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 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.
Advanced and User-friendly Operation
•Collaborative Online-meeting Switching–Controllable switching of online−session USB
host participants and space−deployed visual (such as camera) and audible (such as
microphones or headsets) USB peripherals, allows collaborative online meeting and
smooth content sharing operation among online meetings participants.
•BYOD Ease and Convenience –Connect any USB−C device as an online meeting
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 plays signal of the plugged source on the
connected display, according to user-configured preferences, such as last-connected
input.
•Simple and Flexible Control –Remote IP-controller connection, browser operation
webpage, local panel buttons, or remotely connected contact-closure buttons, 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.

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SWT3-41-U –Introduction
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•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.
Typical Applications
SWT3-41-U is ideal for the following 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 space peripherals.
Controlling your SWT3-41-U
Control your SWT3-41-U directly via the front panel push buttons (with on-screen menus, 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.

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SWT3-41-U –Defining SWT3-41-U 4x1 USB Switcher
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Defining SWT3-41-U 4x1 USB
Switcher
This section defines SWT3-41-U.
Figure 1: SWT3-41-U 4x1 USB Switcher Front Panel
#
Feature
Function
HOST on USB-C 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 on the rear panel 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 power adapter (20V DC). 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.
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
Powered via the 12V/20V power connector.
Lights yellow
Powered by PoE.
Lights Blue
Power is on and a source is connected.
1
2
3
4

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SWT3-41-U –Defining SWT3-41-U 4x1 USB Switcher
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Figure 2: SWT3-41-U 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 DEVICE
USB A 3.1 Ports (1
to 3)
Connect to the USB local devices (for example, a USB camera, a
soundbar, microphone and so on).
USB-C 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 3-pin Terminal Block
(S1 to S2)
PIN G is common to RS-232
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
PIN G is common to I/O
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
•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).
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 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 to its factory settings.
5
6
7
8
9
10
4
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SWT3-41-U –Mounting SWT3-41-U
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Mounting SWT3-41-U
This section provides instructions for mounting SWT3-41-U. 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 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 in a rack:
•Use the recommended rack adapter
(see www.kramerav.com/product/SWT3-41-U).
Mount SWT3-41-U 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.

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SWT3-41-U –Connecting SWT3-41-U
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Connecting SWT3-41-U
Always switch off the power to each device before connecting it to your SWT3-41-U. After
connecting your SWT3-41-U, connect its power and then switch on the power to each device.
Figure 3: Connecting to the SWT3-41-U Rear Panels
To connect SWT3-41-U as illustrated in the example in Figure 3:
1. Connect the HOST USB-C 3.1 ports to laptops or PCs.
2. Connect the HOST USB-B 3.1 ports to room PCs or laptops.
3. Connect USB DEVICE ports:
▪Connect the room keyboard and mouse to the USB DEVICE USB-A 3.1 port 1 on
the rear panel.
▪Connect the soundbar to the USB DEVICE USB-A 3.1 port 2 on the rear panel.
▪Connect a PTZ camera to the USB DEVICE USB-A 3.1 port 3 on the rear panel.
▪Connect a hands-free mic to the USB-C port 4 on the rear panel.
4. To control the PTZ camera, connect the RS-232 3-pin terminal block connector to
the PTZ camera.
5. Connect a room controller (for example, the Kramer SL-240C) via LAN to the LAN PoE
Ethernet RJ-45 port .
Send serial commands from SL-240C to the PTZ camera via RS-232.
6. Connect the IO 2-pin terminal block :
▪To an occupancy detector.
▪To a selector button.
7. When not PoE powered, connect the power adapter to SWT3-41-U and to the mains
electricity.
To charge the device that is connected to the USB-C port, you need to use a power adapter
for powering the SWT3-41-U.
1
5
6
6
6
7
9
10
8
11

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SWT3-41-U –Connecting SWT3-41-U
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Connecting to SWT3-41-U via RS-232
You can connect to SWT3-41-U via an RS-232 connection using, for example, a PC.
SWT3-41-U features an RS-232 3-pin terminal block connector allowing the RS-232 to control
SWT3-41-U.
Connect the RS-232 terminal block on the rear panel of SWT3-41-U 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 RS-232 terminal
block
•Pin 3 to the RX pin on the SWT3-41-U RS-232 terminal
block
•Pin 5 to the G pin on the SWT3-41-U RS-232 terminal
block
RS-232 Device SWT3-41-U
9

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SWT3-41-U –Operating and Controlling SWT3-41-U
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Operating and Controlling
SWT3-41-U
Principles of Operation
Flexible SWT3-41-U Auto Switching Policy
Set the USB host switching to connected USB devices policy to:
•Manual –Select a USB host manually and switching occurs whether a USB host live
signal is present or not.
•Auto –Auto Switching selection is performed in either Last Connected or Priority policy.
In Last Connected policy, if the signal on the current USB host is lost, SWT3-41-U
automatically selects the last connected USB host. The auto-switching delay depends on the
configurable signal-lost timeout.
In Priority policy, when the USB host sync signal is lost for any reason, the USB host with a
live signal and next in priority is selected automatically. The auto-switching delay depends on
the configurable signal-lost timeout. USB hosts priority is configurable; the default setting is
USB-C 1 USB C 2 USB 3 USB 4.
(see Setting the USB Auto-Switching Policy on page 18)
Online Meeting Systems Integration
USB device ports can be set to auto-disconnect following presenter disconnection, to allow
smooth integration and auto-activation of connected online meeting room systems.
(see Auto-disconnecting a USB Device on Inactive Host on page 24).
Routing IP-Driven Control Signals via Built-in Control Gateway
•Remote IP connected clients can communicate and control (send commands, and
receive responses and notifications), via the LAN, using the SWT3-41-U built-in and I/O
control gateway:
▪RS-232 commands, to control devices connected to SWT3-41-U control ports. The
built-in control gateway sends the serial control commands (converted from the client
received IP messages) to the serially controlled connected devices and distributes
their received responses to all connected clients.

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▪Send or receive I/O digital triggers or detected triggers, to I/O control devices
connected to SWT3-41-U control ports. The built-in control gateway sends the I/O
control commands (converted from the client received IP messages) to the I/O
controlled connected devices and distributes their received detected triggers to all
connected clients.
(see Control Gateway Properties on page 26).
Flexible Remote Buttons Control
Remote contact-closure buttons can be connected to the I/O ports, for easy end user control
of device functions by button press and release operation. Flexible configuration of button
press/release actions and latching (default) or momentary operation mode, enable simple and
custom control according to user needs.
(see Configuring Remote Buttons on page 34).
Using Front and Rear Panel Buttons
SWT3-41-U front panel buttons enable the following actions:
•Selecting a HOST INPUT.
•Resetting device to its factory settings (for additional instructions on resetting and
resetting device (see Resetting and Restarting Device on page 21).
Operating via Ethernet
•Directly to the PC using a crossover cable (see Connecting Ethernet Port Directly to a
PC on page 10).
•Via a network switch or router, using a straight-through cable (see Connecting Ethernet
Port via a Network Hub on page 12).
If you want to connect via a router and your IT system is based on IPv6, speak to your IT
department for specific installation instructions.
Connecting Ethernet Port Directly to a PC
You can connect the Ethernet port of SWT3-41-U directly to the Ethernet port on your PC
using a crossover cable with RJ-45 connectors.
This type of connection is recommended for identifying SWT3-41-U
with the factory configured default IP address.
After connecting SWT3-41-U to the Ethernet port, configure your PC as follows:
1. Click Start > Control Panel > Network and Sharing Center.
2. Click Change Adapter Settings.

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SWT3-41-U –Operating and Controlling SWT3-41-U
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3. Highlight the network adapter you want to use to connect to the device and click Change
settings of this connection.
The Local Area Connection Properties window for the selected network adapter appears
as shown in Figure 4.
Figure 4: Local Area Connection Properties Window
4. Highlight either Internet Protocol Version 6 (TCP/IPv6) or Internet Protocol Version 4
(TCP/IPv4) depending on the requirements of your IT system.
5. Click Properties.
The Internet Protocol Properties window relevant to your IT system appears as shown in
Figure 5 or Figure 6.
Figure 5: Internet Protocol Version 4 Properties Window

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SWT3-41-U –Operating and Controlling SWT3-41-U
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Figure 6: Internet Protocol Version 6 Properties Window
6. Select Use the following IP Address for static IP addressing and fill in the details as
shown in Figure 7.
For TCP/IPv4 you can use any IP address in the range 192.168.1.1 to 192.168.1.255
(excluding default 192.168.1.39 fallback address) that is provided by your IT department.
Figure 7: Internet Protocol Properties Window
7. Click OK.
8. Click Close.
Connecting Ethernet Port via a Network Hub or Switch
You can connect the Ethernet port of SWT3-41-U to the Ethernet port on a network hub or
using a straight-through cable with RJ-45 connectors.
Configuring Ethernet Port
You can set the Ethernet parameters via the embedded Web pages.

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SWT3-41-U –Operating and Controlling SWT3-41-U
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Discovering and acquiring IP address
SWT3-41-U includes IP address auto-acquiring policy via LAN-connected DHCP server by
default. When no DHCP server is detected, a fallback static IP address of 192.168.1.39, and
255.255.255.0 subnet mask (class C), is assigned until an IP address is acquired via the
DHCP server.
For more information, refer to Product Page Technical Note in
www.kramerav.com/product/SWT3-41-U.

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SWT3-41-U –Using Embedded Web Pages
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Using Embedded Web Pages
SWT3-41-U enables you to configure settings via Ethernet using built-in, user-friendly web
pages. The Web pages are accessed using a Web browser and an Ethernet connection.
You can also configure SWT3-41-U via Protocol 3000 commands (see Protocol 3000
Commands on page 46).
Before attempting to connect:
•Perform the procedure in (see Operating via Ethernet on page 10).
•Ensure that your browser is supported.
The following operating systems and Web browsers are supported:
Operating Systems
Browser
Windows 7
Chrome
Windows 10
Edge
Chrome
Mac
Safari
iOS
Safari
Android
N/A
If a web page does not update correctly, clear your Web browser’s cache.
Check that Security/firewalls are not blocking HTTP traffic between the device and the user
PC.
To access the web pages:
1. Enter the IP address of the device in the address bar of your internet browser (default =
192.168.1.39).
If security is enabled, the Login window appears.
Figure 8: Embedded Web Pages Login Window

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2. Enter the Username (default = Admin) and Password (default = Admin) and click
Sign in. The default web page appears.
Figure 9: Default Landing Page

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SWT3-41-U –Using Embedded Web Pages
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3. Click the arrow at the top of the navigation list to view the menu items in detail.
Figure 10: Pages and Tabs Navigable List
4. Click the Navigation Pane on the left side of the screen to access the relevant web page.
SWT3-41-U web pages enable performing the following actions:
•Operations on page 17.
•Settings on page 18.
•Diagnostics on page 35.
•Administration on page 36.
•Viewing the About Page on page 41.

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SWT3-41-U –Using Embedded Web Pages
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Operations
Routing Signals
Routing a Host to Devices
Route any of the four USB hosts to all connected USB-C devices.
To route the Host to the Devices:
1. Go to the Routing Settings tab.
Figure 11: Routing Page
2. Perform the following functions:
▪Click a Host/Devices cross-point.
A green light button indicates a connected source.
A host is routed to the devices.

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Settings
•USB Switching Properties on page 18.
•Device Properties on page 19.
•Settings Networking Properties on page 23.
•Control Gateway Properties on page 26.
•Configuring I/O (GPIO) Ports on page 29.
•Defining and Testing Commands via Action Editor on page 33.
•Configuring Remote Buttons on page 34.
This section details the following action:
USB Switching Properties
This section details the following action:
•Setting the USB Auto-Switching Policy on page 18.
Setting the USB Auto-Switching Policy
To set the USB auto-switching policy:
1. Go to the Auto switching tab.
2. Next to the Selection Mode drop-down box, select the auto switching policy: Manual,
Last Connected or Priority.
USB auto-switching policy is set.
To change USB Host Input Priorities:
1. Go to the Auto switching tab.
2. Next to the Selection Mode drop-down box, select Priority.