1
AT-HDR-EX-70C-TX
4K HDR HDBaseT Transmitter with Control
AT-HDR-EX-70C-TX
The Atlona AT-HDR-EX-70C-TX is a HDBaseT™ transmitter for 4K and high dynamic range (HDR)
content. It supports extension of 4K/UHD video @ 60 Hz with 4:4:4 chroma sampling plus HDR
data, multi-channel audio, control signals, and power up to 130 ft (40 m) or 1080p up to 230 ft
(70 m) over Category 6/6A cable.
The HDR-EX-70C-TX is ideal for use with the AT-HDR-EX-70C-RX receiver for transmitting 4K
HDR in point-to-point applications. It can also be used with the AT-UHD-CLSO-824 and AT-
UHD-SW-5000ED for transmitting 4K/UHD @ 60 Hz 4:2:0 signals to the switchers from a remote
source.
IMPORTANT: Visit https://atlona.com/product/at-hdr-ex-70c-tx for the latest rmware
updates and Installation Guide.
1 x AT-HDR-EX-70C-TX
2 x Mounting brackets
4 x Mounting screws
1 x 48V DC power supply
1 x 2-pin captive screw connector
1 x 3-pin captive screw connector
1 x 4-pin captive screw connector
Package Contents
Installation Guide
2
AT-HDR-EX-70C-TX
DC 48V
-
+
RS-232
RX TX
SS
HDBaseT OUT
HDMI IN
IR OUTIR IN
AT-HDR-EX-70C-TX
POWER
LINKTEST UTILITY
1. LINK
2. FW
3. TEST
4. 5V LOCK
Panel Descriptions
1 TEST
Quick and easy test for cables when used
with the AT-HDR-EX-70C-RX. Use the
button to start the test and the LED to
determine pass or fail.
2 UTILITY
Connect a mini-USB to USB-A cable from
this port to a computer for updating and
testing. Rotate the dial to set the unit into
dierent modes.
3 POWER and LINK LEDs
The power LED will illuminate green when
receiving power. The link LED will glow
yellow when signal is being sent/received
between the transmitter and the receiver.
4 DC 48V
Connect the included power supply to this
port.
5 RS-232
Bidirectional control port, used for pass
through of commands to or from the
receiver.
6 IR
Connect a 3rd party controller to the IR IN
port or an IR emitter to the IR OUT port.
7 HDBaseT OUT
Connect an HDBaseT cable from this port
to the HDBaseT IN port on the receiver.
8 HDMI IN
Connect an HDMI cable from a source to
this port. e.g. HDR BluRay Player
5 6 7 84
321
Pin out will be determined by the
RS-232 cable and connect as
RX (receive), TX (transmit) and
(Ground).
A 3-pin captive screw connector for RS-232 has been included.
A 4-pin captive screw connector for IR has been included.
IR IN is connected by a ground and signal wire. Use
with 3rd party control systems.
IR OUT is connected by a ground and signal wire.
For easy termination, Atlona recommends using the 3
meter IR cable AT-IR-CS-TX.
RS-232
IR
GND RX
TX
GNDRX TX
IR IN IR OUT
GND
S
S
Installation Guide
3
AT-HDR-EX-70C-TX
The AT-HDR-EX-70C-TX includes two mounting brackets and four mounting screws each, which
can be used to attach the units to any at surface.
1. Position one of the mounting brackets,
as shown below, aligning the holes on
the side of the enclosure with one set of
holes on the mounting bracket.
2. Use the enclosure screws to secure the
mounting bracket to the enclosure.
3. Repeat the above steps to attach
the second mounting bracket to the
opposite side of the unit.
Mounting Instructions
FW
AT-HDR-EX-70C-RX
POWER
LINK
Included screws
-
+
The power cable will be white for the
positive connection and black for the
negative connection. These should be
placed in the corresponding captive
screw ports.
A 2-pin captive screw connector for the power supply has been included.
Power
-
+
+
-
Installation Guide
4
AT-HDR-EX-70C-TX
4. Mount the unit using the oval-shaped holes, on each mounting bracket. If using a drywall
surface, a #6 drywall screw is recommended.
FW
AT-HDR-EX-70C-RX
POWER
LINK
1. Connect an AV source to the HDMI IN port on the transmitter.
2. Connect an AV display to the HDMI OUT port on the compatible receiver.
3. Connect an HDBaseT cable, from the HDBaseT OUT port on the transmitter, to the
HDBaseT input on the compatible receiver.
4. *Optional* Connect an RS-232 control system to the transmitter or connect an RS-232
source to be controlled by the compatible receiver’s RS-232.
5. *Optional* Connect an IR receiver to the IR IN port of the receiver.
6. *Optional* Connect an IR emitter to the IR OUT port of the transmitter.
7. Connect the included 48V power supply into the DC 48V port.
8. Connect power supply to an AC outlet.
Installation
Refer to the tables below for recommended cabling when using Altona products with HDBaseT.
The green bars indicate the signal quality when using each type of cable. Higher-quality signals
are represented by more bars.
Cable Recommendation Guidelines
Core Shielding CAT5e CAT6 CAT6a CAT7
Solid UTP (unshielded) N/A
STP (shielded)
Performance Rating (MHz) 350 500 600 800
*Atlona recommends TIA/EIA 568-B termination for optimal performance.
Cable* Max. Distance @ 4K Max. Distance @ 1080p
CAT5e / CAT6 115 feet (35 meters) 200 feet (60 meters)
CAT6a / CAT7 130 feet (40 meters) 230 feet (70 meters)
IMPORTANT: Stranded or patch cables are not recommended due to performance
issues.
NOTE: Mounting brackets can also be inverted
to mount the unit under a table or other at
surface.
Installation Guide
5
AT-HDR-EX-70C-TX
TEST
The HDR-EX-70C-TX has the ability to test the HDBaseT cable quality through the front panel.
Press the test button on the front panel of the transmitter to start the test.
Button:
• Blue Blinking: The test is running properly.
• Red Light: There is no signal for the test to check.
LED:
• No Light: There is no HDBaseT cable plugged in.
• Blinking: There is no HDBaseT signal coming through.
• Green: The HDBaseT cable is good.
• Yellow: One or two HDBaseT pairs are not working, reterminate
the cable.
• Red: Multiple pairs are not working. Reterminate the cable and if
the LED turns yellow or red again, replace the cable.
DC 48V
-
+
RS-232
RX TX
SS
HDBaseT OUT
HDMI IN
IR OUTIR IN
AT-HDR-EX-70C-TX
POWER
LINK
TEST
UTILITY
1. LINK
2. FW
3. TEST
4. 5V LOCK
Mode 1: Link
This is the default position of the dial and puts the unit into normal operation.
Mode 2: FW
This mode sets the transmitter into rmware updating mode. View Firmware Updating
instructions on the next page for manual updating.
DC 48V
-
+
RS-232
RX TX
SS
HDBaseT OUT
HDMI IN
IR OUTIR IN
AT-HDR-EX-70C-TX
POWER
LINKTEST
UTILITY
1. LINK
2. FW
3. TEST
4. 5V LOCK
UTILITY
The utility port and dial are used for updating rmware,
HDBaseT cable testing/debugging, and 5V lock. Use the Dial
to switch between modes.
NOTE: Before setting the unit to mode 3 (TEST), the Atlona Analyzer should be
downloaded from the resource tab located at:
https://atlona.com/product/at-hdr-ex-70c-tx/
NOTE: Test function only works when used with AT-HDR-EX-70C-RX.
Installation Guide
6
AT-HDR-EX-70C-TX
1. Open the Analyzer software.
2. Plug in the power supply of the transmitter.
3. Connect a receiver using an HDBaseT cable.
4. Connect an active source to the transmitter and an active display to the receiver. Set the
source to the highest resolution.
5. Set the Utility dial to 3.
6. Connect the transmitter’s Utility mini USB port to a PC using a mini USB to USB A cable.
7. Select the COM port in the Analyzer software and press the connect button.
8. Once connected, press the Start button. The link information and cable pairing test
results will display. Follow the instructions on the Analyzer software for any pair failures.
9. When complete, set the utility dial back to 1 or 4 for normal operation.
Mode 3: TEST
This mode sets the transmitter into HDBaseT testing and debugging mode. Firmware may also
be updated in this mode using the Atlona Analyzer software.
Quality Testing
1. Open the Analyzer software.
2. Select Debug from the top navigation.
3. Plug in the power supply of the transmitter.
4. Connect a receiver using an HDBaseT cable.
5. Connect an active source to the transmitter and an
active display to the receiver. Set the source to the
highest resolution
6. Set the Utility dial to 3.
7. Connect the transmitter’s Utility mini USB port to a PC
using a mini USB to USB A cable.
8. Select the COM port and press the connect button.
9. Press the Debug button. Information will appear in the box eld if there is any data that
can be logged. The log can be saved to the local computer if needed.
10. Set the dial back to 1 or 4 for normal operation.
Debug
Mode 4: 5V Lock
This mode sets the +5V and the HPD signal of the transmitter and receiver to high. This allows
the source and display to have a consistent connection, even if there are issues with the source
and display signals.
Installation Guide
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AT-HDR-EX-70C-TX
Updating Firmware (manually)
1. Download the rmware .zip le from the rmware tab located at https://atlona.com/at-hdr-ex-
70c-tx.
2. Unzip the .bin le to an easy to locate area of the local PC.
3. Set the Utility dial on the front of the unit to mode 2.
4. Connect the unit’s Utility mini USB port to a PC using a mini USB to USB A cable.
5. The PC should automatically detect the 70C and display the autorun options.
6. Select the view les in folder option. A new window will open.
7. If there are any les inside the folder, delete them, otherwise drag and drop the .bin le into
the folder. While the rmware loads to the unit, the green power LED on the front panel will
ash.
8. Once the green LED goes solid, disconnect the unit from the PC. The rmware update is
nished.
9. Repeat these steps for both the transmitter and receiver.
10. Set the Utility dial back to 1 or 4 for normal operation.
Installation Guide
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AT-HDR-EX-70C-TX
Version 1
English Declaration of Conformity
The English version can be found under the resources tab at:
https://atlona.com/product/at-hdr-ex-70c-tx/.
© 2025 Atlona Inc. All rights reserved. “Atlona” and the Atlona logo are registered trademarks of Atlona Inc. All other brand names and trademarks or registered
trademarks are the property of their respective owners. Pricing, specications and availability subject to change without notice. Actual products, product images,
and online product images may vary from images shown here.
US International
atlona.com • 408.962.0515 • 41.43.508.4321
25394-R1
Warranty
Chinese Declaration of Conformity 中国RoHS合格声明
To view the product warranty, use the following link or QR code:
https://atlona.com/warranty/.
由SKU列出於:
https://atlona.com/about-us/china-rohs/.
The terms HDMI, HDMI High-Denition Multimedia Interface, HDMI trade dress and the HDMI Logos are
trademarks or registered trademarks of HDMI Licensing Administrator, Inc.
Installation Guide
