User Manual

Quick-Start Guide
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Manual Revision: August 12, 2019
Product Diagram (ST121HD20L)
Transmitter and Receiver Front View
Component Function
Transmitter and Receiver
1 Power LED Indicator
• Solid green when the Universal Power Adapter
is connected
Transmitter
2 Link LED Indicator
• Solid green when the HDMI Source Device is
connected
Receiver
2 Link LED Indicator
• Solid green when the CAT6 Cable is connected
and the HDMI Source Device Video Signal is
active
Transmitter and Receiver Rear View
HDMI over CAT6 Extender | 4K 60Hz
Port Function
Transmitter and Receiver
3 DC IN Ports
• Power the Transmitter and Receiver
• 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
4
HDMI IN and OUT
Ports
• Connect an HDMI Source and HDMI Display
Device
5 IR TX and RX Ports
• 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 dierent IR
congurations
6
RS-232 Extension
Ports
• Connect any Serial Device to extend the signal
over CAT6 Cable
7 RJ45 Ports
• 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
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.
4
5
6 7
1 2
3