UHD12-EXB400-K Overview and Use Cases

What Is the UHD12-EXB400-K?

The OREI UHD12-EXB400-K is an 18Gbps 1x2 HDMI HDBaseT splitter extender kit. It distributes one HDMI source signal to two remote HDMI displays over CAT6 / CAT6a / CAT7 cable, with an additional HDMI loop out on the Transmitter for a local display.

The kit includes one UHD12-EXB400-K Transmitter and two HDBaseT Receivers. The HDMI source connects to HDMI IN on the Transmitter, the local display can connect to HDMI LOOP OUT, and each remote display connects through an included HDBaseT Receiver.

The UHD12-EXB400-K supports HDMI 2.0b and HDCP 2.2 / 1.x, with a video bandwidth of 18Gbps. It supports video resolutions up to 4K@60Hz 4:4:4, HDR, HDR10+, HLG, Dolby Vision, HDMI loop out, two HDBaseT outputs, bi-directional IR, RS-232 pass-through, digital and analog audio output on the Transmitter, advanced EDID management, ASCII command control, and one-way PoE from the Transmitter to the Receivers. It extends 4K@60Hz up to 394ft / 120m and 1080p@60Hz up to 492ft / 150m over a single CAT6 / CAT6a / CAT7 cable. 

The UHD12-EXB400-K is useful for conference rooms, classrooms, churches, restaurants, bars, retail displays, control rooms, home theaters, commercial AV installations, and any setup where one HDMI source needs to be shown on two long-distance displays.

IMPORTANT — UHD12-EXB400-K Is a 1x2 HDBaseT Splitter Extender

The UHD12-EXB400-K sends one HDMI source to two remote displays.

This product duplicates one HDMI source to multiple displays. It does not create separate independent video outputs or extended PC desktop screens.

IMPORTANT — Supports 4K@60Hz 4:4:4

The UHD12-EXB400-K supports video resolutions up to 4K@60Hz 4:4:4.

Supported video features include:

To get 4K@60Hz 4:4:4, the HDMI source, displays, HDMI cables, CAT cable, and EDID setting must all support the required signal.

IMPORTANT — Dolby Vision Has a Remote Output Limitation

The manual notes an important Dolby Vision limitation:

If Dolby Vision is needed at the remote display, confirm the required resolution before installation.

IMPORTANT — Maximum Distance Depends on Resolution

The UHD12-EXB400-K supports different extension distances depending on the resolution.

For best performance, use high-quality CAT6 / CAT6a / CAT7 cable.

Poor cable quality, bad terminations, couplers, patch panels, or long HDMI cables may reduce performance.

IMPORTANT — Use Direct CAT Cable Connections

Each HDBaseT Receiver should be connected directly to the Transmitter using CAT6 / CAT6a / CAT7 cable.

Do not connect the HDBaseT outputs through:

• Network switch 
• Router 
• Internet network 
• LAN switch 
• Standard Ethernet network 
• Home or office data network 

This product is an HDBaseT splitter extender, not an AV-over-IP system.

The manual also cautions to use UTP connectors with a direct interconnection method and not to cross connect.

IMPORTANT — One-Way PoE Is Supported

The UHD12-EXB400-K supports one-way PoE from the Transmitter to the Receivers.

This means the Transmitter can power the HDBaseT Receivers through the CAT cable.

The package includes one 24V/1A DC locking power adapter.

If a Receiver does not power on, check the Transmitter power, CAT cable, cable termination, and HDBaseT connection.

IMPORTANT — HDMI Loop Out Is on the Transmitter

The Transmitter includes HDMI LOOP OUT.

This HDMI loop output can be used to connect a local display near the HDMI source.

Example setup:

The local display and both remote displays show the same HDMI source.

IMPORTANT — Audio Output Is on the Transmitter

The UHD12-EXB400-K supports digital and analog audio output on the Transmitter.

Audio output ports include:

Use these audio outputs to connect an amplifier, powered speakers, sound system, or audio receiver near the Transmitter.

If analog audio does not work, set the HDMI source audio output to PCM / Stereo.

IMPORTANT — Receiver Also Has Audio Output

Each Receiver includes AUDIO OUT.

This audio output can connect to a speaker or soundbar near the remote display.

Use the Receiver AUDIO OUT when audio is needed at the display side.

IMPORTANT — Bi-Directional IR Is Supported

The UHD12-EXB400-K supports bi-directional IR.

This means IR control can work in both directions:

Typical source-control setup:

• Connect the IR Receiver cable to IR IN on the Receiver 
• Connect the IR Blaster cable to IR OUT on the Transmitter 
• Place the IR Receiver near the remote display 
• Place the IR Blaster near the HDMI source device’s IR window 

Typical display-control setup:

• Connect the IR Receiver cable to IR IN on the Transmitter 
• Connect the IR Blaster cable to IR OUT on the Receiver 
• Place the IR Receiver near the source-side control location 
• Place the IR Blaster near the display IR window 

The manual lists IR receiving distance as 0–5m at ±45° and 0–8m at ±90°.

IMPORTANT — RS-232 Pass-Through Is Supported

The UHD12-EXB400-K supports RS-232 pass-through between the Transmitter and Receivers.

The Transmitter RS-232 port supports three functions:

RS-232 can be used for:

• Projector control 
• Display control 
• Control processor integration 
• Matrix control 
• Automation systems 
• Firmware update 
• Splitter command control 

Default serial settings:

IMPORTANT — Advanced EDID Management Is Included

The UHD12-EXB400-K includes a 5-pin EDID dial switch and ASCII command EDID control.

EDID options include:

Use EDID management when there is no video, wrong resolution, audio compatibility issue, or mixed display capability.

IMPORTANT — ASCII Command Control Is Supported

The UHD12-EXB400-K supports ASCII command control through the RS-232 port.

ASCII commands can control or check:

• Power 
• Reboot 
• Factory reset 
• Firmware version 
• Input connection status 
• HDMI loop output status 
• HDBT output status 
• HDMI loop stream on / off 
• HDBT output stream on / off 
• HDMI loop HDCP on / off 
• HDBT output HDCP on / off 
• EDID settings 
• User EDID 
• RS-232 bypass routing 
• Receiver serial port settings 

This is useful for professional AV control systems and troubleshooting.

IMPORTANT — HDMI Audio Format Support

The UHD12-EXB400-K supports HDMI audio pass-through up to 7.1CH HD audio.

Supported HDMI audio formats include:

• LPCM 2.0 / 2.1 / 5.1 / 6.1 / 7.1 
• Dolby Digital 
• Dolby TrueHD 
• Dolby Digital Plus 
• DTS-ES 
• DTS-HD Master 
• DTS-HD HRA 
• DTS:X 

The connected source, display, AVR, soundbar, or audio system must also support the selected audio format.

Ports and Panel Layout

Step-by-Step Setup

1. Connect the HDMI source device to HDMI IN on the Transmitter. 
   Examples include a DVD player, Blu-ray player, cable box, streaming device, media player, laptop, DVR, NVR, or HDMI matrix output. 
2. Connect a local display to HDMI LOOP OUT on the Transmitter if needed. 
3. Connect HDBT OUTPUT 1 on the Transmitter to HDBT IN on Receiver 1 using CAT6 / CAT6a / CAT7 cable. 
4. Connect HDBT OUTPUT 2 on the Transmitter to HDBT IN on Receiver 2 using CAT6 / CAT6a / CAT7 cable. 
5. Connect each Receiver HDMI OUT to its display. 
6. Connect the included DC 24V/1A locking power adapter to the Transmitter. 
7. If using Transmitter audio output, connect COAX AUDIO OUT or L/R AUDIO OUT to an amplifier, powered speakers, or audio system. 
8. If using Receiver audio output, connect Receiver AUDIO OUT to a speaker or soundbar. 
9. If using IR control, connect IR Receiver and IR Blaster cables in the required control direction. 
10. If using RS-232, connect the Phoenix connector wiring between the control system and the device. 
11. Set the EDID dial switch based on the required resolution and audio format. 
12. Power on the Transmitter, HDMI source, displays, and connected audio/control equipment. 
13. Check the POWER, IN, LOOP, OUT, link, and data signal indicators. 
14. Test video, audio, HDMI loop out, IR, RS-232, and each HDBaseT output. 

CAT Cable Requirement — Critical

Use high-quality CAT6 / CAT6a / CAT7 cable.

Poor CAT cable may cause:

• No video 
• Flickering 
• Black screen 
• Receiver not powering on 
• Poor link signal indicator status 
• HDBaseT link failure 
• Audio dropouts 
• IR control issues 
• RS-232 issues 
• 4K@60Hz not working 

Use direct CAT cable runs whenever possible.

HDMI Cable Requirement — Critical

Use HDMI cables rated for 18Gbps when using 4K@60Hz 4:4:4.

Poor HDMI cables may cause:

• No picture 
• Flickering 
• Black screen 
• HDR issues 
• Dolby Vision issues 
• Audio dropouts 
• HDCP handshake issues 
• No signal on HDMI loop out 
• No signal on HDBaseT outputs 

For troubleshooting, test the HDMI source directly with the display before using the splitter extender.

Power Requirement — Critical

The UHD12-EXB400-K uses one DC 24V/1A locking power adapter connected to the Transmitter.

If a Receiver does not power on, check the Transmitter power, CAT cable, and HDBT link.

Understanding the Transmitter

The Transmitter is installed near the HDMI source.

It has:

• HDMI IN 
• HDMI LOOP OUT 
• Two HDBT outputs 
• COAX audio output 
• L/R analog audio output 
• IR IN and IR OUT 
• RS-232 
• EDID dial switch 
• DC 24V power input 
• Power switch 
• POWER, IN, LOOP, and OUT LEDs 

The Transmitter splits the HDMI source and sends it to the local HDMI loop display and two HDBaseT Receivers.

Understanding the HDBaseT Receiver

Each HDBaseT Receiver is installed near a remote HDMI display.

Each Receiver has:

• HDBT IN 
• HDMI OUT 
• AUDIO OUT 
• IR IN and IR OUT 
• RS-232 
• SERVICE port 
• Optional DC 24V input 
• Power, link, and data signal indicators 

The Receiver receives HDMI over HDBaseT and outputs it to the connected display.

Understanding HDMI Loop Out

The HDMI LOOP OUT port on the Transmitter lets you connect a local display near the source.

The local display and both remote HDBaseT displays show the same HDMI source.

This is useful for AV racks, control rooms, classrooms, sports bars, restaurants, and commercial installations where a source-side display is needed.

Understanding Audio Output

The UHD12-EXB400-K provides audio output at both the Transmitter side and Receiver side.

For analog audio output, set the HDMI source to PCM / Stereo.

Understanding Bi-Directional IR

Bi-directional IR lets remote control signals travel both directions through the extender system.

Use the IR Receiver cable where the remote control will be pointed.

Use the IR Blaster cable near the device being controlled.

Do not swap IR Receiver and IR Blaster cables because their pin definitions are different.

Understanding RS-232 Pass-Through

RS-232 pass-through sends control commands between the Transmitter and Receivers.

Common RS-232 uses include:

• Display control 
• Projector control 
• HDMI matrix control 
• Control processor integration 
• Firmware update 
• EDID control 
• Output stream control 
• RS-232 routing to HDBaseT outputs 

Understanding EDID Management

EDID tells the HDMI source what video and audio format to output.

Use EDID when:

• There is no video 
• Displays show the wrong resolution 
• Audio does not work 
• 4K@60Hz does not display correctly 
• Different displays support different formats 
• Dolby / DTS audio does not pass correctly 

The EDID dial switch can select a preset, copy EDID from the loop output, copy EDID from HDBT outputs, or place the unit into PC control mode.

Understanding Signal Indicators

Use these indicators to troubleshoot CAT cable, HDBaseT link, HDCP, and HDMI input issues.

Supported Video and Audio

The UHD12-EXB400-K supports video formats including:

Supported HDMI audio formats include:

Supported de-embedded audio:

Supported Technical Specifications

What Source Devices Is the UHD12-EXB400-K Compatible With?

The UHD12-EXB400-K is compatible with HDMI source devices such as:

• Blu-ray players 
• DVD players 
• Cable boxes 
• Satellite receivers 
• Streaming devices 
• Media players 
• Desktop PCs 
• Laptops with HDMI output 
• Game consoles 
• DVRs 
• NVRs 
• HDMI matrix outputs 
• HDMI switch outputs 
• AV receivers with HDMI output 

The source must output a supported HDMI resolution up to 4K@60Hz.

What Displays Is the UHD12-EXB400-K Compatible With?

The UHD12-EXB400-K can connect to HDMI displays such as:

• 4K TVs 
• 1080p TVs 
• Projectors 
• Monitors 
• Commercial displays 
• Digital signage screens 
• Classroom displays 
• Conference room displays 
• Church displays 
• Restaurant TVs 
• Bar displays 
• Retail displays 
• Local display near the source 

For 4K@60Hz, the display must support 4K@60Hz input.

What Audio Devices Is the UHD12-EXB400-K Compatible With?

The audio outputs can connect to:

• Amplifiers 
• AV receivers 
• Powered speakers 
• Soundbars 
• Audio processors 
• Distributed audio systems 
• Classroom audio systems 
• Conference room audio systems 

Use COAX output for digital audio and L/R output for analog stereo audio.

Frequently Asked Questions

Q: What is the OREI UHD12-EXB400-K used for? 
A: The UHD12-EXB400-K is used to split and extend one HDMI source to two remote HDMI displays over CAT6 / CAT6a / CAT7 cable using HDBaseT technology.

Q: Is the UHD12-EXB400-K a splitter or extender? 
A: It is both. It is a 1x2 HDMI HDBaseT splitter extender.

Q: How many HDMI inputs does it have? 
A: It has one HDMI input.

Q: How many HDBaseT outputs does it have? 
A: It has two HDBaseT outputs.

Q: How many Receivers are included? 
A: Two HDBaseT Receivers are included.

Q: Does it support a local display? 
A: Yes. The Transmitter has HDMI LOOP OUT for a local display.

Q: Does the UHD12-EXB400-K support 4K@60Hz? 
A: Yes. It supports video resolutions up to 4K@60Hz 4:4:4.

Q: Does it support 8K? 
A: No. It supports up to 4K@60Hz.

Q: Does it support 4K@120Hz? 
A: No. It does not support 4K@120Hz.

Q: What HDMI version does it support? 
A: It supports HDMI 2.0b.

Q: What HDCP version does it support? 
A: It supports HDCP 2.2 and HDCP 1.x.

Q: What video bandwidth does it support? 
A: It supports 18Gbps video bandwidth.

Q: Does it support HDR? 
A: Yes. It supports HDR, HDR10+, HLG, and Dolby Vision.

Q: Does Dolby Vision work on remote displays at 4K@60Hz? 
A: The manual notes that for Dolby Vision, the local HDMI loop out supports 4K@60Hz, but the remote HDMI output supports 1080p@60Hz.

Q: How far can it extend 4K@60Hz? 
A: It extends 4K@60Hz up to 394ft / 120m over CAT6 / CAT6a / CAT7 cable.

Q: How far can it extend 1080p@60Hz? 
A: It extends 1080p@60Hz up to 492ft / 150m over CAT6 / CAT6a / CAT7 cable.

Q: Can I connect the HDBaseT outputs through a network switch? 
A: No. The HDBaseT outputs should connect directly to the included Receivers.

Q: Is this AV over IP? 
A: No. This is an HDBaseT splitter extender, not an AV-over-IP system.

Q: Does it support PoE? 
A: Yes. It supports one-way Power over Ethernet from the Transmitter to the Receivers.

Q: Do the Receivers need separate power adapters? 
A: Normally no. The Receivers can be powered by the Transmitter through the CAT cable.

Q: What power adapter is included? 
A: The package includes one 24V/1A DC locking power adapter.

Q: Does it support audio extraction? 
A: Yes. It supports coaxial and analog L/R audio output on the Transmitter.

Q: Do the Receivers have audio output? 
A: Yes. Each Receiver includes AUDIO OUT for connection to a speaker or soundbar.

Q: What audio formats are supported through HDMI? 
A: It supports LPCM up to 7.1, Dolby Digital, Dolby TrueHD, Dolby Digital Plus, DTS-ES, DTS-HD Master, DTS-HD HRA, and DTS:X.

Q: What audio formats are supported from the coaxial output? 
A: Coaxial output supports PCM 2.0, Dolby Digital / Plus, and DTS 2.0 / 5.1.

Q: What audio format is supported from analog L/R output? 
A: Analog L/R output supports PCM 2.0CH.

Q: Does it support IR control? 
A: Yes. It supports bi-directional IR.

Q: Which IR cable goes where for source control? 
A: Connect the IR Receiver to Receiver IR IN and the IR Blaster to Transmitter IR OUT.

Q: Which IR cable goes where for display control? 
A: Connect the IR Receiver to Transmitter IR IN and the IR Blaster to Receiver IR OUT.

Q: Does it support RS-232? 
A: Yes. It supports RS-232 command control and RS-232 pass-through.

Q: What is the default RS-232 baud rate? 
A: The default baud rate is 115200.

Q: Does it support EDID management? 
A: Yes. It supports EDID through the EDID dial switch and ASCII commands.

Q: Can it copy EDID from the local loop display? 
A: Yes. It can copy EDID from HDMI LOOP OUT.

Q: Can it copy EDID from HDBaseT outputs? 
A: Yes. It can copy EDID from HDBT output 1 or HDBT output 2.

Q: Does it create extended desktop across two displays? 
A: No. It duplicates one HDMI source to the connected displays.

Q: What should I do if there is no video? 
A: Check the power adapter, HDMI source, HDMI cables, CAT cable, EDID setting, HDBaseT output connection, and the link/data signal indicators.

Q: What should I do if one Receiver has no signal? 
A: Check that Receiver’s CAT cable, HDMI cable, display input, HDBT connection, and power/link indicators. Also test that Receiver on another HDBT output port.

Q: What should I do if both Receivers have no signal? 
A: Check the Transmitter power, HDMI source output, EDID setting, and HDMI LOOP OUT on the Transmitter.

Q: What should I do if 4K@60Hz does not work? 
A: Use 18Gbps HDMI cables, high-quality CAT6 / CAT6a / CAT7 cable, keep the run within 394ft / 120m, confirm the source and display support 4K@60Hz, and choose a compatible EDID setting.

Q: What should I do if analog audio output does not work? 
A: Set the HDMI source audio output to PCM / Stereo and connect the L/R output to an amplifier or speaker.

Q: What should I do if IR control does not work? 
A: Confirm the IR Receiver and IR Blaster cables are connected in the correct direction and that the IR Blaster is placed near the controlled device’s IR sensor.

Q: What should I do if RS-232 does not work? 
A: Check Phoenix connector wiring, baud rate, RS-232 bypass routing, and control command format.

Q: Does the UHD12-EXB400-K need external power? 
A: Yes. Connect the included DC 24V/1A locking power adapter to the Transmitter. The Receivers are powered through the CAT cables by one-way PoE.