
SWT3-21-H, SWT-41-H Quick Start
SWT3-21-H and SWT3-41-H Quick Start Guide
This guide helps you install and use your SWT3-21-H, SWT-41-H for the first time.
Go to www.kramerav.com/downloads/SWT3-21-H, SWT-41-H to download the latest user manual and
check if firmware upgrades are available.
Step 1: Check what’s in the box
SWT3-21-H / SWT3-41-H HDMI Switcher
Step 2: Get to know your SWT3-21-H, SWT-41-H
Press to select an HDMI input (LED button lights orange). (2 for SWT3-21-H, 4 for
SWT3-41-H).
When referring to SWT3-41-H in this document, it also applies to
SWT3-21-H.
Press to turn display On (LED button lights orange) or Off.
Press to decrease audio output volume.
3 + Press to increase audio output volume.
Press to MUTE and press again to UNMUTE
Lights red when audio output is muted.
A valid IP address has been acquired.
A means to identify the device in a
system, using command #IDV.
IP fallback address has been acquired.
PSU-powered on (only).
Note: This is applicable when power
supply is PoE mode.
Power is on and an active source and
acceptor are connected.
Power is on and an active source is
connected.
Connect to an HDMI source (2 for SWT3-21-H, 4 for SWT3-41-H).
Connect to an HDMI acceptor.
AUDIO OUT 5-pin Terminal Block
Connector
Connect to a balanced stereo audio acceptor.

Terminal block Connector
(S1-S6)
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.
Connect to LAN to accept power, control and manage the device.
For restoring factory default settings, press the RESET button and connect
power to device (keep pressing longer than 6sec after power connection)
Connect to the power supply and to the mains electricity.
RS-232 3-pin Terminal Block Connector
Connect to an RS-232 controller.
Step 3: Mount SWT3-41-H
Install SWT3-41-H 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
(see www.kramerav.com/downloads/SWT3-21-H, SWT-41-H SWT3-41-H ).
• Mount the unit in a rack using the recommended rack adapter
(see www.kramerav.com/product/SWT3-21-H, SWT-41-H
SWT3-41-H ).
• 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.

Step 4: Connect inputs and outputs
Always switch OFF the power on each device before connecting it to your SWT3-41-H. For best results, we recommend that
you always use Kramer high-performance cables to connect AV equipment to the SWT3-41-H.
Connect the Audio Output:
To a balanced stereo
audio acceptor:
To an unbalanced
stereo audio acceptor:
For optimum range and performance use the recommended Kramer cables available at www.kramerav.com/product/SWT3-21-H, SWT-41-
H SWT3-41-H
Step 5: Connect power
If not PoE-powered, connect the power cord to SWT3-41-H and plug it into the mains electricity.
Safety Instructions (See www.kramerav.com for updated safety information)
Caution:
• 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.
• Disconnect the power and unplug the unit from the wall before installing.

Step 6: Control SWT3-41-H
Operate SWT3-41-H:
• Remotely, by IP or RS-232
serial commands transmitted by
a touch screen system, PC, or
other serial controller.
• Embedded web pages via the
Ethernet.
RS-232 Control / Protocol 3000
Example: (Switch video input 2 to the output): #ROUTE 1,1,2<CR>
Default IP Parameters – Set to DHCP On
SWT3-41-H-xxxx (where xxxx are the last 4 digits of the S/N)
When using SWT3-41-H for the first time, the fallback IP address is set until DHCP server is discovered and a new IP address is acquired.
For further details, check the Resources tab on the product page of the website.