What Is the UHD-204VW?
The OREI UHD-204VW is an Ultra HD HDMI 2.0 video wall processor with 2 HDMI inputs, 2 HDMI loop outputs, and 4 HDMI scaling outputs for video wall processing.
The UHD-204VW is designed to take HDMI source signals and display them across multiple HDMI displays in video wall layouts. It can also send HDMI loop-out signals to additional downstream displays or devices.
The UHD-204VW supports HDMI 2.0, HDCP 2.2 / 1.4, input video formats up to 4096x2160@60Hz and 3840x2160@60Hz, output scaling up to 3840x2160@60Hz, bezel compensation, 180° rotation, PIP on video wall, RS-232 control, TCP/IP control, CEC control, analog L/R audio output, digital SPDIF/Toslink audio output, and balanced L/R audio output.
The UHD-204VW is useful for retail displays, control rooms, sports bars, restaurants, conference rooms, classrooms, showrooms, houses of worship, and other installations where a video source needs to be displayed across a multi-screen video wall.
IMPORTANT — UHD-204VW Is a Video Wall Processor, Not a Matrix Switch
The UHD-204VW is mainly a video wall processor.
It has:
- 2 HDMI inputs
- 2 HDMI loop outputs
- 4 HDMI scaling outputs
The four HDMI outputs are designed for video wall display processing.
This product is not the same as a standard HDMI matrix where many inputs can be freely routed to many outputs. Use this product when the goal is to create a video wall or processed multi-screen display layout.
IMPORTANT — UHD-204VW Supports 4 HDMI Video Wall Outputs
The UHD-204VW has four scaling HDMI outputs labeled HD 1, HD 2, HD 3, and HD 4.
These outputs are used to connect the displays that make up the video wall.
A common setup is a 2x2 video wall using four displays.
The product can also be configured through the PC tool for different video wall layouts depending on the display arrangement.
IMPORTANT — HDMI Loop Outputs Are Not the Same as Video Wall Outputs
The UHD-204VW includes two HDMI loop outputs.
These loop outputs pass the HDMI A / B input signals downstream.
The loop outputs are useful when you want to send the original input signal to another display or device while the main scaling outputs are used for video wall processing.
Do not confuse the LOOP OUT ports with the four video wall output ports.
IMPORTANT — 4K@60Hz Is Supported, Not 8K or 4K@120Hz
The UHD-204VW supports input video formats up to 4096x2160@60Hz and 3840x2160@60Hz.
It does not support 8K or 4K@120Hz.
For 8K or 4K@120Hz systems, use an HDMI 2.1 device that supports the required bandwidth and resolution.
IMPORTANT — 3840x2160@25/30Hz Is for Standalone Display Only
The PC tool lists multiple output resolutions, including 3840x2160@25Hz and 3840x2160@30Hz.
However, the manual notes that 3840x2160@25/30Hz can only be used for standalone display, not for video wall.
For video wall setups, choose an output resolution supported by the video wall configuration and connected displays.
IMPORTANT — Bezel Compensation Helps Align the Video Wall Image
The UHD-204VW supports bezel compensation.
Bezel compensation helps account for the physical borders between displays so the image appears more natural across the video wall.
The PC tool supports two bezel compensation methods:
- Type A: pixel-based adjustment
- Type B: adjustment using inner and outer display dimensions in millimetres
Use bezel compensation when objects or lines appear broken or misaligned across display borders.
IMPORTANT — RS-232 and Network Control Require PC Tool Setup
The UHD-204VW can be controlled using the PC tool through either UART / RS-232 or network control.
The RS-232 control baud rate is 57600 bps.
For network control, connect the LAN port to a PC or network using an RJ45 cable.
The PC tool is used for matrix-style input selection, signal settings, output resolution, fine-tuning, video wall setup, CEC control, EDID management, and factory reset.
Ports and Panel Layout
| Port / LED / Button | Location | Function |
| Power LED | Front panel | Lights up when the unit is powered on |
| Input LEDs HD A / HD B | Front panel | Lights up when the corresponding HDMI input is connected to an active HDMI source |
| Loop LEDs LP A / LP B | Front panel | Lights up when the corresponding loop output is connected to an HDMI display |
| Output LEDs HD 1 / HD 2 / HD 3 / HD 4 | Front panel | Lights up when the corresponding HDMI output is connected to an HDMI display |
| HDMI Inputs HD A / HD B | Rear panel | Connect HDMI source devices such as DVD player, laptop, media player, or game console |
| LOOP OUT A / B Main | Rear panel | Loop out HDMI A / B signals to downstream displays or devices |
| HDMI Outputs HD 1–HD 4 | Rear panel | Scaling HDMI outputs for video wall displays |
| 12V/3A | Rear panel | Connect the included 12V/3A power adapter |
| GND | Rear panel | Grounds the product housing |
| Toslink / 3.5mm Audio Output | Rear panel | Provides digital SPDIF audio output and analog L/R 3.5mm stereo audio output |
| Balanced Out | Rear panel | Balanced L/R audio output using 5-pin Phoenix connector |
| Service / Update | Rear panel | Firmware update port |
| RS232-CTL | Rear panel | External RS-232 control port |
| RS232 | Rear panel | Loop out RS232-CTL control command |
| LAN | Rear panel | Network port for TCP/IP control using RJ45 cable |
Step-by-Step Setup
- Connect the included 12V/3A power adapter to the UHD-204VW.
- Connect your HDMI source device to HDMI Input HD A or HD B.
Examples include a DVD player, laptop, media player, camera system, or game console. - Connect the four HDMI video wall displays to HDMI Outputs HD 1, HD 2, HD 3, and HD 4.
- If using loop output, connect LOOP OUT A or LOOP OUT B to an additional downstream TV, monitor, or HDMI device.
- If using external audio, connect one of the audio outputs:
- Toslink / SPDIF for digital audio
- 3.5mm analog L/R for stereo audio
- Balanced Out for balanced audio systems
- If using RS-232 control, connect the RS232-CTL port to a PC or control system using the 3-pin Phoenix connector.
- If using network control, connect the LAN port to a PC or network using an RJ45 cable.
- Power on the source devices, displays, audio system, and UHD-204VW.
- Open the PC tool and connect through UART / RS-232 or Network.
- Use the PC tool to select the input source, configure output resolution, set up the video wall, adjust bezel compensation, and save the layout if needed.
HDMI Cable Requirement — Critical
For best performance, use high-quality HDMI cables that support HDMI 2.0 and 4K@60Hz.
Poor-quality or long HDMI cables may cause:
- No video output
- Flickering
- Black screen
- Input not detected
- Output not detected
- Video wall alignment issues
- 4K@60Hz not working properly
- Audio dropouts
For troubleshooting, test the HDMI source directly with a display, try shorter HDMI cables, and lower the output resolution temporarily.
Understanding the HDMI Inputs
The UHD-204VW includes two HDMI input ports:
| Input | Function |
| HD A | HDMI input source A |
| HD B | HDMI input source B |
These inputs can be selected in the PC tool for the scaling outputs and loop output.
The front-panel HD A / HD B input LEDs will light when the corresponding input is connected to an active HDMI source.
Understanding Loop Output
The UHD-204VW includes two HDMI loop outputs.
| Loop Output | Function |
| LOOP OUT A | Loops HDMI A signal downstream |
| LOOP OUT B / MAIN | Loops HDMI B / Main signal downstream |
Loop outputs are useful when you want to send the original input signal to another display while also using the scaling outputs for the video wall.
Understanding the Four Scaling Outputs
The UHD-204VW has four HDMI scaling outputs labeled HD 1, HD 2, HD 3, and HD 4.
These outputs are used for the video wall displays.
The PC tool can set the resolution of each scaling output.
Available output resolutions include:
| No. | Output Resolution |
| 1 | 3840x2160p 60Hz |
| 2 | 3840x2160p 50Hz |
| 3 | 3840x2160p 30Hz |
| 4 | 3840x2160p 25Hz |
| 5 | 1920x1200 60Hz |
| 6 | 1920x1080p 60Hz |
| 7 | 1920x1080p 50Hz |
| 8 | 1600x1200 60Hz |
| 9 | 1440x1050 60Hz |
| 10 | 1366x768 60Hz |
| 11 | 1360x768 60Hz |
| 12 | 1280x1024 60Hz |
| 13 | 1280x768 60Hz |
| 14 | 1280x720p 60Hz |
| 15 | 1280x720p 50Hz |
| 16 | 1024x768 60Hz |
Note: 3840x2160p 25/30Hz can only be used for standalone display, not for video wall.
Understanding Video Wall Mode
The UHD-204VW uses the PC tool to configure video wall layouts.
Basic video wall setup:
- Open the PC tool.
- Connect to the UHD-204VW using UART / RS-232 or Network.
- Go to the Video Wall page.
- Adjust Rows and Columns to match the display arrangement.
- Set the number of available outputs.
- Click Set to apply the screen configuration.
- Drag-select the screens that should be part of the video wall.
- Right-click and choose Screen Stitching.
- Use Input Select to choose the source shown on the video wall.
- Adjust bezel compensation if needed.
- Save the scene if you want to recall the layout later.
The product can also create more than one video wall group, such as two separate 2x1 video walls, depending on the selected outputs.
Understanding PIP on Video Wall
The UHD-204VW supports PIP on the video wall.
PIP allows an additional image or window to appear within a video wall layout depending on the selected configuration in the PC tool.
This is useful when a main video wall needs to show one primary source while also displaying a secondary source or window.
Understanding Bezel Compensation
Bezel compensation helps correct the image across display borders.
The PC tool supports two types of bezel adjustment:
| Bezel Type | Function |
| Type A | Uses pixel values for left, right, top, and bottom adjustment |
| Type B | Uses display inner and outer dimensions in millimetres |
The manual shows the difference between no bezel compensation and correct bezel compensation. Without bezel compensation, the image can appear misaligned across display borders. With correct bezel compensation, the image appears more natural across the video wall.
Understanding 180° Rotation / Mirror
The UHD-204VW supports 180° rotation using the Mirror option in the video wall context menu.
The Mirror option has two settings:
| Mirror Setting | Function |
| Off | Normal display orientation |
| On | H+V mirror, creating 180° rotation for the selected screen |
This is useful when a display is physically installed upside down and needs image rotation.
Understanding the Video Wall Context Menu
The Video Wall page includes a right-click context menu.
| Option | Function |
| Screen Stitching | Combines selected screens into a video wall configuration |
| Cancel Stitching | Returns the video wall configuration to normal outputs |
| Screen x Cancel Stitching | Removes one selected screen from the video wall |
| Input Select | Selects which input appears on the video wall or secondary image |
| Output Select | Assigns output selection for a screen not in video wall mode |
| Output Type | Available for screens not assigned to video wall mode |
| Output Format | Sets the output resolution for a selected screen |
| Mirror | Enables or disables 180° rotation using H+V mirror |
| Test Pattern | Displays a color bar test pattern |
Understanding Layout Save / Load
The UHD-204VW PC tool supports saving and loading video wall layouts.
Up to 10 video wall configurations can be saved and recalled.
Each saved scene can be given a name so installers can identify the layout later.
This is useful for installations that need different display modes for different events, rooms, or operating conditions.
Understanding Audio Output
The UHD-204VW includes multiple audio output options.
| Audio Output | Function |
| Toslink / SPDIF | Digital audio output |
| 3.5mm L/R | Analog stereo audio output |
| Balanced Out | Balanced L/R audio output using 5-pin Phoenix connector |
The manual lists audio format support including 2.0 channel, 5.1 channel, LPCM, Dolby, AC3, and DTS.
Balanced audio output supports 20Hz–20kHz and up to 1.5Vrms max.
The 3.5mm analog L/R output also supports 20Hz–20kHz and up to 1.5Vrms max.
Understanding EDID Management
The UHD-204VW PC tool includes EDID control.
EDID control can be used to:
- Read each scaling output port’s downstream EDID and save it as a BIN file
- Open an existing EDID file and write it to HDMI A and HDMI B input ports as Manual EDID
- Select a predefined EDID and write it to HDMI A and HDMI B input ports
Predefined EDID options include:
| EDID Option |
| 4K60-2.0CH |
| 4K60-5.1CH |
| 4K30-2.0CH |
| 4K30-5.1CH |
| 1080P-2.0CH |
| 1080P-5.1CH |
| 720P-2.0CH |
| 1024x768-2.0CH |
| 1920x1200-2.0CH |
| 1680x1050-2.0CH |
| 1600x1200-2.0CH |
| 1440x900-2.0CH |
| 1400x1050-2.0CH |
| 1360x768-2.0CH |
| 1280x1024-2.0CH |
| Manual |
Use 4K60 EDID modes for 4K displays.
Use 1080P or lower EDID modes for older displays or troubleshooting.
Use 5.1CH modes only when the connected audio system supports 5.1 audio.
Understanding FineTune / Picture Settings
The PC tool includes a FineTune:PQ page.
This page allows the installer to read and adjust:
- Brightness
- Contrast
- Saturation
- Sharpness
The manual recommends keeping the default settings at 50 / 50 / 50 / 50 unless there is a specific reason to change them.
If the image looks incorrect after changes, click Reset to return to factory settings.
Understanding CEC Control
The UHD-204VW supports CEC control through the PC tool.
CEC functions include:
- Power on
- Power off
- Volume up
- Volume down
- Mute / unmute
If Auto Power On is enabled, the product will turn on all connected displays whenever the product is turned on.
CEC behavior depends on whether the connected displays support CEC and have CEC enabled.
RS-232 and LAN Control
The UHD-204VW supports both RS-232 and network control.
| Control Method | Details |
| RS-232 | Connect RS232-CTL to a PC or control system |
| Baud Rate | 57600 |
| Data Bits | 8 |
| Parity | None |
| Stop Bits | 1 |
| LAN | RJ45 network port for TCP/IP control |
RS-232 and LAN control are useful for professional AV control systems, automation systems, and fixed installations.
What Source Devices Is the UHD-204VW Compatible With?
The UHD-204VW can work with HDMI source devices such as:
- DVD players
- Blu-ray players
- Laptops
- Desktop PCs
- Media players
- Streaming devices
- Game consoles
- Camera systems
- Presentation systems
For 4K@60Hz input, the source device and HDMI cable must support HDMI 2.0 and 4K@60Hz output.
What Displays Is the UHD-204VW Compatible With?
The UHD-204VW can connect to HDMI displays such as:
- TVs
- Monitors
- Projectors
- Commercial displays
- Video wall displays
- Digital signage screens
For best video wall results, the displays should ideally be the same size and resolution.
What Audio Devices Is the UHD-204VW Compatible With?
The UHD-204VW can send audio to:
- Speakers
- Amplifiers
- Audio processors
- Balanced audio systems
- Digital audio systems using SPDIF / Toslink
- Stereo audio systems using 3.5mm L/R output
Use the correct output type based on the audio system being connected.
Frequently Asked Questions
Q: What is the OREI UHD-204VW used for?
A: The UHD-204VW is used to create HDMI video wall layouts using up to four HDMI displays. It has two HDMI inputs, two HDMI loop outputs, and four HDMI scaling outputs.
Q: Is the UHD-204VW a video wall controller?
A: Yes. It is an Ultra HD video wall processor designed for multi-display video wall processing.
Q: Is the UHD-204VW a matrix switch?
A: Not in the same way as a standard HDMI matrix. It has two HDMI inputs and four scaling outputs for video wall processing, plus two loop outputs. It is mainly designed as a video wall processor.
Q: How many HDMI inputs does it have?
A: It has two HDMI inputs: HD A and HD B.
Q: How many HDMI video wall outputs does it have?
A: It has four HDMI scaling outputs labeled HD 1, HD 2, HD 3, and HD 4.
Q: What are the loop outputs used for?
A: The loop outputs send the HDMI A / B input signals downstream to another display or HDMI device.
Q: Does the UHD-204VW support 4K@60Hz?
A: Yes. It supports input and output resolutions up to 3840x2160@60Hz.
Q: Does the UHD-204VW support 8K?
A: No. The UHD-204VW supports up to 4K@60Hz. It does not support 8K.
Q: Does the UHD-204VW support 4K@120Hz?
A: No. It supports up to 4K@60Hz.
Q: Can I use 3840x2160@30Hz for video wall mode?
A: No. The manual notes that 3840x2160@25/30Hz can only be used for standalone display, not for video wall.
Q: Does it support bezel compensation?
A: Yes. It supports bezel compensation using pixel values or display dimension values.
Q: Does it support 180° rotation?
A: Yes. The Mirror option can enable H+V mirror for 180° rotation.
Q: Does it support PIP?
A: Yes. The manual lists PIP support on video wall.
Q: Can I save video wall layouts?
A: Yes. Up to 10 video wall configurations can be saved and recalled using the PC tool.
Q: Does it support EDID management?
A: Yes. The PC tool can read, save, open, and write EDID settings for HDMI A and HDMI B inputs.
Q: What audio outputs are available?
A: It includes digital SPDIF / Toslink, 3.5mm analog L/R, and balanced L/R audio output.
Q: What audio formats are supported?
A: The manual lists 2.0 channel, 5.1 channel, LPCM, Dolby, AC3, and DTS.
Q: Does it support CEC control?
A: Yes. It supports CEC control for display power, volume, and mute/unmute through the PC tool.
Q: What is Auto Power On in CEC control?
A: If Auto Power On is enabled, the product will turn on all connected displays when the UHD-204VW is turned on.
Q: How do I control the UHD-204VW?
A: Use the PC tool through UART / RS-232 or Network. The unit also supports RS-232 and TCP/IP control.
Q: What is the RS-232 baud rate?
A: The RS-232 baud rate is 57600, with 8 data bits, no parity, and 1 stop bit.
Q: What should I do if there is no video output?
A: Check that the HDMI source is active, confirm the correct input is selected in the PC tool, verify the output display is connected, try another HDMI cable, and lower the output resolution for testing.
Q: What should I do if the video wall image looks misaligned?
A: Use bezel compensation in the PC tool and enter the correct pixel values or display dimensions.
Q: What should I do if the image looks wrong after adjusting picture settings?
A: Go to FineTune:PQ in the PC tool and click Reset to restore the default picture settings.
Q: Does the UHD-204VW need external power?
A: Yes. Connect the included 12V/3A power adapter.
Comments
0 comments
Please sign in to leave a comment.