Startech ST121HD20L User Manual
HDMI over CAT6 Extender | 4K 60Hz
Quick-Start Guide
Product Diagram (ST121HD20L)
Transmitter and Receiver Front View
1 2
Component Function
Transmitter and Receiver
1 Power LED Indicator
2 Link LED Indicator
2 Link LED Indicator
Transmitter and Receiver Rear View
• Solid green when the Universal Power Adapter
is connected
Transmitter
• Solid green when the HDMI Source Device is
connected
Receiver
• Solid green when the CAT6 Cable is connected
and the HDMI Source Device Video Signal is
active
Port Function
Transmitter and Receiver
• Power the Transmitter and Receiver
3 DC IN Ports
HDMI IN and OUT
4
Ports
5 IR TX and RX Ports
RS-232 Extension
6
Ports
7 RJ45 Ports
• Secure the Universal Power Adapters into the
DC IN Ports by inserting the Barrel Connectors
on the Universal Power Adapters and turning
the Screw Locks clockwise
• Connect an HDMI Source and HDMI Display
Device
• Connect the IR (Infrared) Blasters and
Receivers to control the HDMI Source and
HDMI Display Device from the Transmitter or
Receiver
• Bi-directional to support dierent IR
congurations
• Connect any Serial Device to extend the signal
over CAT6 Cable
• Connect the CAT6 Cable to extend the signal
from the Source Device to the HDMI Display
Device
Requirements
For the latest requirements and to view the full User Manual, please visit
www.startech.com/ST121HD20L.
• HDMI Source Device x 1
• HDMI Display Device x 1
• CAT6 Cable x 1
• (Optional) Surface for Mounting x 1
Installation
3
4
To view manuals, FAQs, videos, drivers, downloads, technical drawings, and more, visit www.startech.com/support.
5
6 7
Installing the HDMI Transmitter and Receiver
1. Position the Transmitter near the HDMI Source Device.
2. Connect an HDMI Cable to the HDMI Source Device and to the HDMI IN Port on
the back of the HDMI Transmitter.
Manual Revision: August 12, 2019
3. Connect a CAT6 Cable (included) to the RJ45 Port on the back of the HDMI
Transmitter and to the RJ45 Port on the back of the HDMI Receiver.
Note: The cabling should not go through any networking equipment (e.g. router,
switch, etc.).
4. Position the HDMI Receiver near the HDMI Display Device.
5. Connect an HDMI Cable to the HDMI OUT Port on the back of the HDMI Receiver
and to the HDMI Display Device.
6. Connect the Universal Power Adapters to the DC IN Ports on the Transmitter and
Receiver and to two AC Electrical Outlets.
Installing the IR Blaster and IR Receiver
Control the HDMI Display Device from the Transmitter
1. Connect the Infrared Receiver (oval shaped) to the IR - TX Port on the Transmitter.
2. Peel the Film o of the Adhesive Pad that is located on the Infrared Receiver.
Stick the Infrared Receiver in a location where there is a clear path to the Remote
Control.
Note: Ensure there is an unobstructed path to the Infrared Receiver. Infrared signals
require a direct line of sight to function.
3. Connect the Infrared Blaster (L shaped) to the IR - RX Port on the Receiver.
4. Peel the Film o of the Adhesive Pad that is located on the Infrared Blaster. Stick
the Infrared Blaster on the HDMI Display Device so that it is pointing directly at the
IR Sensor on the Display.
5. Use the Remote Control for the HDMI Source Device to control the HDMI Display
Device from the Transmitter’s location.
Control the HDMI Source Device from the Receiver
1. Connect the Infrared Blaster (L shaped) to the IR - RX Port on the Transmitter.
2. Peel the Film o of the Adhesive Pad that is located on the Infrared Blaster. Stick
the Infrared Blaster so that it is pointing directly at the IR Sensor on the HDMI
Source Device.
Note: Consult the HDMI Source Device’s manual to determine the location of the IR
Sensor.
3. Connect the Infrared Receiver (oval shaped) to the IR - TX Port on the Receiver.
4. Peel the Film o of the Adhesive Pad that is located on the Infrared Receiver.
Stick the Infrared Receiver in a location where there is a clear path to the Remote
Control.
Notes: Infrared signals require a direct line of sight to function.
Consult the manual for the HDMI Display Device to determine the location of the IR
Sensor.
5. Use the Remote Control for the HDMI Source Device to control the HDMI Source
Device from the Receiver’s location.
Note: Consult the HDMI Display Device’s manual to determine the location of the IR
Sensor.
FCC Compliance Statement
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC
Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation.
This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the
instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not
occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be
determined by turning the equipment o and on, the user is encouraged to try to correct the interference by one or more of the
following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit dierent from that to which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help
This 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. Changes or modications not expressly approved by StarTech.com could void
the user’s authority to operate the equipment.
Industry Canada Statement
This Class B digital apparatus complies with Canadian ICES-003.
Cet appareil numérique de la classe [B] est conforme à la norme NMB-003 du Canada.
CAN ICES-3 (B)/NMB-3(B)
This device complies with Industry Canada licence-exempt RSS standard(s). Operation is subject to the following two conditions:
(1) This device may not cause interference, and (2) This device must accept any interference, including interference that may
cause undesired operation of the device.
Le présent appareil est conforme aux CNR d’Industrie Canada applicables aux appareils radio exempts de licence. L’exploitation
est autorisée aux deux conditions suivantes:
(1) l’appareil ne doit pas produire de brouillage, et (2) l’utilisateur de l’appareil doit accepter tout brouillage radioélectrique subi,
même si le brouillage est susceptible d’en compromettre le fonctionnement.
Use of Trademarks, Registered Trademarks, and other Protected Names and Symbols
This manual may make reference to trademarks, registered trademarks, and other protected names and/or symbols of thirdparty companies not related in any way to StarTech.com. Where they occur these references are for illustrative purposes only
and do not represent an endorsement of a product or service by StarTech.com, or an endorsement of the product(s) to which
this manual applies by the third-party company in question. StarTech.com hereby acknowledges that all trademarks, registered
trademarks, service marks, and other protected names and/or symbols contained in this manual and related documents are the
property of their respective holders.
Warranty Information
This product is backed by a two-year warranty.
For further information on product warranty terms and conditions, please refer to www.startech.com/warranty.
Limitation of Liability
In no event shall the liability of StarTech.com Ltd. and StarTech.com USA LLP (or their ocers, directors, employees or agents)
for any damages (whether direct or indirect, special, punitive, incidental, consequential, or otherwise), loss of prots, loss of
business, or any pecuniary loss, arising out of or related to the use of the product exceed the actual price paid for the product.
Some states do not allow the exclusion or limitation of incidental or consequential damages. If such laws apply, the limitations
or exclusions contained in this statement may not apply to you.
Safety Measures
• If product has an exposed circuit board, do not touch the product under power.
Mesures de sécurité
• Si l’un des circuits imprimés du produit est visible, ne pas touchez le produit lorsqu’il est sous tension.
安全対策
• 製品に露出した状態の回路基盤が含まれる場合、電源が入っている状態で製品に触らないでください。
Misure di sicurezza
• Se il prodotto ha un circuito stampato visibile, non toccare il prodotto quando è acceso.
Säkerhetsåtgärder
• Rör aldrig vid enheter med oskyddade kretskort när strömmen är påslagen.
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StarTech.com LLP
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43137
U.S.A.
StarTech.com Ltd.
Unit B, Pinnacle 15
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Brackmills
Northampton
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