Kramer SWT3-31-HU User manual

P/N: 2900-301609 Rev 1 www.kramerav.com
USER MANUAL
MODEL:
SWT3-31-HU
3x1 4K60 USB-C/HDMI Switcher

Kramer Electronics Ltd.
SWT3-31-HU –Contents
i
Contents
Introduction 1
Getting Started 1
Overview 2
Typical Applications 4
Defining SWT3-31-HU 3x1 4K60 USB-C/HDMI Switcher 5
Mounting SWT3-31-HU 7
Connecting SWT3-31-HU 8
Connecting the Output to a Balanced/Unbalanced Stereo Audio Acceptor 9
Connecting to SWT3-31-HU via RS-232 10
Operating and Controlling SWT3-31-HU 11
Principles of Operation 11
Using Front and Rear Panel Buttons 15
Operating via Ethernet 15
Using Embedded Web Pages 19
Routing Signals 22
Setting AV Properties 24
Setting Device Properties 28
Setting Control Gateway Properties 35
Viewing Device Status 45
Setting Security Properties 46
Viewing the About Page 50
Upgrading Firmware 51
Technical Specifications 52
Default Communication Parameters 53
Protocol 3000 54
Understanding Protocol 3000 54
Protocol 3000 Commands 55
Result and Error Codes 69

Kramer Electronics Ltd.
SWT3-31-HU –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/SWT3-31-HU 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 SWT3-31-HU 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.

Kramer Electronics Ltd.
SWT3-31-HU –Introduction
2
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
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 SWT3-31-HU 3x1 4K60 USB-C/HDMI Switcher.
SWT3-31-HU is a high−performance auto−switcher with one USB−C and two HDMI/USB
inputs and HDMI output. The connected USB peripherals, such as a room camera and
microphone, are switchable for use of the active USB host, for convenient hybrid meeting
operation with both room and online participants.
SWT3-31-HU provides exceptional quality, advanced and user-friendly operation, and flexible
control.
Exceptional Quality
•Hybrid-meeting Collaborative Switching –Controllable coupled-signals switching of both
AV and USB host inputs, for concurrent connection with AV output and space USB
devices, allows collaborative hybrid meeting where multiple meeting participants are
switched to share their content with both room and online meeting participants.
•HDMI Signal Switching –4K60 4:4:4 HDMI resolution and HDCP 2.3 compliant,
supporting deep color, x.v.Color™, CEC, HDMI uncompressed audio channels, Dolby
TrueHD, DTS-HD, 2K, 4K, and 3D as specified in HDMI 2.0.
•USB 3.1 Switching –USB 3.1 signals switching, enables high data-rate connection
between active USB host and space USB devices, such as 4K camera, high-quality
audio devices, and HID (Human Interface Devices) mouse or keyboard devices.
•HDMI Mirroring –Active USB-C or HDMI input signal is mirrored to loop output port for
connecting a local monitor or adding an additional unit in a daisy chain.
•I-EDIDPro™Kramer Intelligent EDID Processing™–Intelligent EDID handling,
processing and pass-through algorithm that ensures Plug and Play operation.
Advanced and User-friendly Operation
•BYOD Ease and Convenience –Connect any DP-Alt-Mode-capable USB-C device as an
AV presentation source, while providing the connected device with USB 2.0 and
Ethernet connection, and (if PD-2.0-capable) up to 60 watts of power, 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.

Kramer Electronics Ltd.
SWT3-31-HU –Introduction
3
•Display Power On/Off Control with Ease: Simply press the DISPLAY ON button to toggle
on / off the power of the connected CEC-enabled display. The button's LED indicator
shows you whether the display is currently powered on / off.
•Simple Control –Remote IP-controller connection, browser operation webpage, local
panel buttons, or remotely connected contact-closure buttons, for easy and fully flexible
user ports selection, signals routing, and switcher control.
•Comprehensive Management –Local panel status LED, remote IP-driven firmware
upgrade and management via user-friendly embedded web pages, and remote IP or
local serial service and management via API commands and responses communication,
for flexible service options and ensure lasting, field proven deployment.
Flexible Connectivity
•Easy Online Meeting System Integrated Connectivity –Built-in flexible auto-
disconnection operation of USB devices, such as room cameras and soundbars, enable
detection of BYOD presenter disconnection by online meeting systems for their auto-
activation, convenient integration, and ease of end-user operation according to space
changing hybrid sessions needs.
•Built-in Intelligent Control Gateway - Remote IP-driven intelligent control of connected
AV, USB and sensor devices via CEC, RS-232, IR 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 Network Connection –Standard IT-grade 802.1x authentication for secured IT
LAN connectivity.
•HDMI Mirroring –Active USB-C or HDMI input signal is mirrored to loop output port for
connecting a local monitor or adding an additional unit in a daisy chain.
•Audio De-embedding –The digital audio signal passing-through to the output, is de-
embedded, converted to an analog signal and sent to the stereo balanced analog audio
output. This enables playing the audio on a locally connected professional audio system
(such as DSP) and speakers, in parallel to playing it on the speakers connected to the
AV acceptor device (such as TVs with speakers).
•Easy and Elegant Installation –PoE powering via LAN port connection, and
MegaTOOLS™fan-less enclosure for dropped-ceiling mounting, or side-by-side
mounting of 2 units in a 1U rack space with the recommended rack adapter, for easy
switcher deployment.

Kramer Electronics Ltd.
SWT3-31-HU –Introduction
4
Typical Applications
SWT3-31-HU is ideal for the following typical applications:
•Enterprise and education hybrid huddle spaces.
•Hybrid user connection element in advanced hybrid meeting solutions.
Controlling your SWT3-31-HU
Control your SWT3-31-HU 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.
SWT3-31-HU –Defining SWT3-31-HU 3x1 4K60 USB-C/HDMI Switcher
5
Defining SWT3-31-HU 3x1 4K60
USB-C/HDMI Switcher
This section defines SWT3-31-HU.
Figure 1: Figure 2: SWT3-31-HU 3x1 4K60 USB-C/HDMI Switcher Front Panel
#
Feature
Function
USB Type A Port
Connect to the USB local devices (for example, a USB PTZ camera).
USB-C IN 1 Port
Connect to a USB-C AV source (that supports DisplayPort Alternate Mode).
Charges the connected source (that supports USB Power Delivery 2.0) up to
60W when the device is powered via the power adapter. While charging, the
charging icon (to the right of the connector) becomes visible and lights orange.
IN Status LED 1 to 3
(per input port)
LED Status
Indicates
Lights blue
An input is selected and connected with an active AV or
AV+USB source.
Flashes blue
An input is selected and has no active AV signal.
Lights blue
An input is selected and connected with an active USB host
only (no AV).
Off
An input is not selected and has an active AV signal.
IN Ports
(2
and 3)
HDMI
Connect to an HDMI source.
HOST USB B
3.1
Connector
Connect to a USB host (for example, a room PC) to communicate with the
USB devices (for example, a PTZ camera) connected on this device.
INPUT SELECT Button
Press to select an input.
DISPLAY ON Button
Press to turn display On/Off.
Button LED lights on sending Display On message.
Button LED turns off on sending Display Off message.
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, using
command #IDV.
Flashes red/green
IP fallback address has been acquired.
STATUS LED
LED Status
Indicates
Dark
Power is off
lights white
PSU-powered on (only).
Note: This is applicable when power supply is PoE mode.
Lights blue
Power is on and a source is connected.
Lights green
Power is on, and a source and an acceptor are
connected.
1
2
3
4
5
6
7
8
9

Kramer Electronics Ltd.
SWT3-31-HU –Defining SWT3-31-HU 3x1 4K60 USB-C/HDMI Switcher
6
Figure 3: SWT3-31-HU 3x1 4K60 USB-C/HDMI Switcher Front Panel
#
Feature
Function
HDMI OUT Connector
Connect to an HDMI acceptor.
HDMI LOOP Connector
Connect to a local acceptor.
USB DEVICE Type A
Port
(2 to 4)
Connect to the USB local devices (for example, a USB camera, a soundbar,
microphone and so on).
IR OUT 3.5mm Mini
Jack
Outputs an IR signal, per command from LAN-connected controller (for
example, from
SL-240C), to a connected IR emitter.
AUDIO OUT 5-pin
Terminal Block
Connector
Connect to a balanced stereo analog audio 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 as a digital input, digital output, or
analog input ports.
RS-232 3-pin Terminal
Block
Connect to an RS-232 controlled device (for example, the connected PTZ
USB camera) to be controlled via an IP-connected controller (for example,
SL-240C).
LAN PoE RJ-45
Connector
Connect to LAN. The device accepts power from the LAN port.
RESET Recessed
Button
For restoring factory default settings, press the RESET button and connect
power to device (keep pressing longer than 6sec after power connection)
12/20V DC Power
Connector
Use the included +12V 5A power supply 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 port.
10
11
12
13
14
15
16
17
18
19

Kramer Electronics Ltd.
SWT3-31-HU –Mounting SWT3-31-HU
7
Mounting SWT3-31-HU
This section provides instructions for mounting SWT3-31-HU. 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 SWT3-31-HU 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 SWT3-31-HU in a rack:
•Use the recommended rack adapter
(see www.kramerav.com/product/SWT3-31-HU).
Mount SWT3-31-HU 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/SWT3-31-HU.

Kramer Electronics Ltd.
SWT3-31-HU –Connecting SWT3-31-HU
8
Connecting SWT3-31-HU
Always switch off the power to each device before connecting it to your SWT3-31-HU. After
connecting your SWT3-31-HU, connect its power and then switch on the power to each
device.
Figure 4: Connecting to the SWT3-31-HU Rear Panel
To connect SWT3-31-HU as illustrated in the example in Figure 4:
1. Connect a USB-C source (for example, a laptop that supports Display Port Alternate
Mode) to the USB-C IN connector .
2. Connect a source (for example, a space PC) to the IN 2 HDMI and USB Host
connectors. Same for IN 3.
3. Connect the HDMI OUT port to an HDMI acceptor (for example, a touch TV).
3. Connect the HDMI LOOP connector to an HDMI acceptor (for example, a local
monitor).
5. Connect USB DEVICE ports:
▪Connect the room keyboard and mouse to the USB 1 type A port on the front
panel.
▪Connect the touch TV to the USB 2 port on the rear panel.
▪Connect a soundbar to the USB 3 port on the rear panel.
▪Connect a PTZ camera to the USB 4 port on the rear panel.
4. To control the touch TV via IR, connect IR OUT 3.5mm mini jack to an IR emitter
cable and attach the cable emitter side to the IR sensor of the touch TV.
5. To control the PTZ camera, connect the RS-232 3-pin terminal block connector to
the PTZ camera.
2
4
5
10
11
1
12
12
12
13
16

Kramer Electronics Ltd.
SWT3-31-HU –Connecting SWT3-31-HU
9
6. Connect a room controller (for example, the Kramer SL-240C) via LAN to the LAN PoE
Ethernet RJ-45 port .
Send from the room controller via LAN:
•IR commands via the room controller to control the smart TV.
•Serial commands to control the camera.
7. Connect the AUDIO OUT 5-pin terminal block connector to a balanced stereo audio
acceptor (for example, Kramer Tavor 5-O speakers).
8. Connect the IO 2-pin terminal block :
▪To an occupancy detector.
▪To a selector button.
9. Connect LAN connector to IT switch for LAN connection and PoE powering.
Optionally, connect the power adapter to SWT3-31-HU and to the mains electricity.
To charge the device that is connected to the USB-C port, you need to use a chargeable
power adapter (purchased separately) for powering the SWT3-31-HU switcher.
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 5: Connecting to a Balanced Stereo Audio
Acceptor
Figure 6: Connecting to an Unbalanced Stereo Audio
Acceptor
17
14
15
17
19

Kramer Electronics Ltd.
SWT3-31-HU –Connecting SWT3-31-HU
10
Connecting to SWT3-31-HU via RS-232
You can connect to SWT3-31-HU via an RS-232 connection using, for example, a PC.
SWT3-31-HU features an RS-232 3-pin terminal block connector allowing the RS-232 to
control SWT3-31-HU.
Connect the RS-232 terminal block on the rear panel of SWT3-31-HU 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 SWT3-31-HU RS-232 terminal
block
•Pin 3 to the RX pin on the SWT3-31-HU RS-232 terminal
block
•Pin 5 to the G pin on the SWT3-31-HU RS-232 terminal
block
RS-232 Device SWT3-31-
HU
13

Kramer Electronics Ltd.
SWT3-31-HU –Operating and Controlling SWT3-31-HU
11
Operating and ControllingSWT3-
31-HU
Principles of Operation
This section covers the following topics:
•Coupled or Individual AV+USB Switching on page 11.
•Flexible SWT3-31-HU Auto Switching Policy on page 11.
•Flexible USB-C Mix of Signals on page 12.
•Online Meeting Systems Integration on page 12.
•Routing IP-Driven Control Signals via Built-in Control Gateway on page 13.
•Flexible Remote Buttons Control on page 14.
Coupled or Individual AV+USB Switching
SWT3-31-HU multi-signal switching of any of the inputs to the AV output and connected USB
devices, is configurable to use one of the following operation modes:
•USB follows AV coupled routing ( ) –Selecting an AV input, routes the AV signal to
the AV output and connects, in parallel, the input-associated USB host with the
connected USB devices.
•USB signal individual routing ( ) –Selecting an AV input, routes the AV signal to the
AV output only. The USB host can be independently selected to connect with the
connected USB devices (see Individual USB Host Routing.
See Routing AV and USB Host Signals on page 23.
This is very useful in hybrid sessions, for convenient switching between multiple presenters
using either their BYOD laptops and/or connected space PC devices.
Flexible SWT3-31-HU Auto Switching Policy
Set the switching policy to:
•Manual –Select an input manually and switching occurs whether a live signal is present
on the input 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 input is lost, SWT3-31-HU automatically
selects the last connected input. The auto-switching delay depends on the configurable
signal-lost timeout.

Kramer Electronics Ltd.
SWT3-31-HU –Operating and Controlling SWT3-31-HU
12
In Priority policy, when the input sync signal is lost for any reason, the input with a live signal
and next in priority is selected automatically. The auto-switching delay depends on the
configurable signal-lost timeout. Inputs priority is configurable; the default setting is USB-C
1HDMI 2 HDMI 3.
See Setting the Auto-Switching Policy on page 24
In both Last Connected and Priority modes, manually selecting an input (using the front
panel, remote or web UI input select button) overrides automatic selection.
Flexible USB-C Mix of Signals
AV and USB signals mix, and their data rate level, of the USB-C host port, can be flexibly set
to either one of:
•High USB 3.0 data rate and lower 4K60 4:2:0 AV resolution mix, or
•High 4K60 4:4:4 AV resolution and lower USB 2.0 data rate mix
See Setting USB-C Host Port Signals Mix on page 32
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 33.

Kramer Electronics Ltd.
SWT3-31-HU –Operating and Controlling SWT3-31-HU
13
Routing IP-Driven Control Signals via Built-in Control Gateway
Remote IP connected clients can send from the LAN, via the SWT3-31-HU built-in control
gateway, CEC, RS-232, I/O and IR commands, and receive responses and notifications, to
control devices connected to SWT3-31-HU HDMI-CEC, RS-232, I/O and IR control ports. The
built-in control gateway sends the control commands (converted from the client received IP
messages) to the connected controlled devices, and distributes the responses received from
the connected controlled devices to all connected clients.
Figure 7 shows the SWT3-31-HU built-in control gateway connection. The Kramer Control
controller is connected to the switcher via LAN, sends IP commands to the switcher control
gateway over the LAN connection, to send control messages to, and receive control
responses from:
•The touch TV connected to the switcher via the IR and/or HDMI (CEC) ports.
•The PTZ Camera connected to the receiver via the RS-232 port.
•The Occupancy Detector & Select In Button connected to the receiver via the I/O ports.
Figure 7: Controlling remotely via Control Gateway
Built-in control gateway activation, activation of the associated control ports and their
attributes (such as the CEC logical address of the control gateway), as well as manual
commands testing operation, is done via SWT3-31-HU control gateway webpages
(see Setting Control Gateway Properties on page 35).

Kramer Electronics Ltd.
SWT3-31-HU –Operating and Controlling SWT3-31-HU
14
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 43)

Kramer Electronics Ltd.
SWT3-31-HU –Operating and Controlling SWT3-31-HU
15
Using Front and Rear Panel Buttons
SWT3-31-HU front and rear panel buttons enable the following actions:
•Selecting an INPUT.
•Turning the display on or off via the DISPLAY ON or sending on or off commands that
are configured via the UI (see Defining and Testing Commands via Action Editor
on page 42) .
•Resetting device to its factory settings (for additional instructions on resetting and
resetting device (see Resetting and Restarting Device on page 29).
Operating via Ethernet
You can connect to SWT3-31-HU via Ethernet using either of the following methods:
•Directly to the PC using a crossover cable (see Connecting Ethernet Port Directly to a
PC on page 15).
•Via a network switch or router, using a straight-through cable (see Connecting Ethernet
Port via a Network Switch on page 17).
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 SWT3-31-HU directly to the Ethernet port on your PC
using a crossover cable with RJ-45 connectors.
This type of connection is recommended for identifying SWT3-31-HU
with the factory configured default IP address.
After connecting SWT3-31-HU to the Ethernet port, configure your PC as follows:
1. Click Start > Control Panel > Network and Sharing Center.
2. Click Change Adapter Settings.

Kramer Electronics Ltd.
SWT3-31-HU –Operating and Controlling SWT3-31-HU
16
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 8.
Figure 8: 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 9 or Figure 10.
Figure 9: Internet Protocol Version 4 Properties Window

Kramer Electronics Ltd.
SWT3-31-HU –Operating and Controlling SWT3-31-HU
17
Figure 10: 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 11.
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 11: Internet Protocol Properties Window
7. Click OK.
8. Click Close.
Connecting Ethernet Port via a Network Switch
You can connect the Ethernet port of SWT3-31-HU to the Ethernet port on a network switch
or router using a straight-through cable with RJ-45 connectors.
Configuring Ethernet Port
You can set the Ethernet parameters via the embedded Web pages.

Kramer Electronics Ltd.
SWT3-31-HU –Operating and Controlling SWT3-31-HU
18
Discovering and acquiring IP address
SWT3-31-HU 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/SWT3-31-HU.