What Is the HDS-401MV?
The OREI HDS-401MV is a 4K HDMI Quad Multi-Viewer Switch designed to switch between four HDMI input sources or display multiple HDMI sources on one screen.
It supports video resolutions up to 4K@30Hz, HDMI 1.4b, HDCP 1.4, and up to 10.2Gbps video bandwidth. The unit provides one HDMI output and supports multiple display layouts including Single, PIP, PBP, Triple, and Quad viewing modes.
The HDS-401MV also supports seamless switching in single-view mode, automatic switching, RS-232 control, EDID management, IR control, and analog 3.5mm audio extraction.
The HDS-401MV is useful for home AV setups, conference rooms, classrooms, security monitoring, control rooms, production monitoring, retail displays, and commercial installations where multiple HDMI sources need to be viewed or switched on one display.
IMPORTANT — HDS-401MV Is a 4x1 HDMI Multi-Viewer Switch
The HDS-401MV combines switching and multi-view display functions.
| Function | Support |
| 4 HDMI inputs | Supported |
| 1 HDMI output | Supported |
| Multi-view display | Supported |
| Single-view switching | Supported |
| PIP / PBP / Triple / Quad layouts | Supported |
| Audio extraction | Supported |
| RS-232 control | Supported |
| HDMI matrix with multiple independent outputs | Not supported |
This product is a 4-input, 1-output HDMI multi-viewer switch.
It is not a 4x4 matrix and does not provide multiple independent HDMI outputs.
IMPORTANT — Supports up to 4K@30Hz
The HDS-401MV supports HDMI input and output resolutions up to 4K@30Hz.
| Video Feature | Support |
| Maximum input resolution | Up to 4K@30Hz |
| Maximum output resolution | Up to 4K@30Hz |
| 1080p@60Hz | Supported |
| 1920x1200@60Hz | Supported |
| 720p@60Hz | Supported |
| HDMI version | HDMI 1.4b |
| HDCP version | HDCP 1.4 |
| Video bandwidth | Up to 10.2Gbps |
| 4K@60Hz | Not supported |
This model supports 4K@30Hz, not 4K@60Hz.
For best compatibility, set 4K sources to 4K@30Hz or lower.
IMPORTANT — Seven Multi-View Modes Are Supported
The HDS-401MV supports multiple multi-view display layouts.
| Display Mode | Support |
| Single | Supported |
| PIP | Supported |
| PBP 1 | Supported |
| PBP 2 | Supported |
| Triple 1 | Supported |
| Triple 2 | Supported |
| Quad 1 | Supported |
| Quad 2 | Supported |
The manual describes the front-panel MV button as cycling through eight display modes: Single, PIP, PBP 1, PBP 2, Triple 1, Triple 2, Quad 1, and Quad 2.
Use these modes to display one source full screen, picture-in-picture, side-by-side layouts, triple-window layouts, or four-source quad layouts.
IMPORTANT — Seamless Switching Is Supported in Single View Mode
The HDS-401MV supports seamless switching when used in Single View / Switch mode.
| Switching Feature | Support |
| Single-view source switching | Supported |
| Seamless switching in single-view mode | Supported |
| Automatic switching | Supported |
| Front-panel switching | Supported |
| Remote switching | Supported |
| RS-232 switching | Supported |
Use Single View mode when you want to switch between HDMI inputs as a standard 4x1 HDMI switch.
IMPORTANT — Automatic Switching Is Supported
The HDS-401MV supports auto switching.
| Auto Switching Feature | Support |
| Auto switching | Supported |
| AUTO LED | Lights green when auto switching is enabled |
| Remote AUTO button | Enables or disables auto switching |
| RS-232 auto switching command | Supported |
Use automatic switching when you want the unit to automatically switch input sources based on the active HDMI signal.
IMPORTANT — HDMI Audio and Analog Audio Extraction Are Supported
The HDS-401MV supports HDMI audio and 3.5mm analog audio output.
| Audio Feature | Support |
| HDMI audio passthrough | Supported |
| 3.5mm L/R analog audio output | Supported |
| Audio extraction | Supported |
| Audio source selection in Multiview mode | Supported |
| Remote audio selection | Supported |
| Audio mute | Supported |
Supported HDMI audio formats include:
| HDMI Audio Format |
| LPCM 2.0 |
| LPCM 5.1 |
| Dolby 2.0 |
| Dolby 5.1 |
| Dolby Digital Plus |
| DTS 2.0 |
| DTS 5.1 |
The 3.5mm L/R analog audio output supports PCM 2.0.
If using the analog audio output, set the source audio to Stereo / PCM 2.0 for best compatibility.
IMPORTANT — Only One Audio Source Outputs at a Time in Multiview Mode
In Multiview mode, the HDS-401MV can show multiple video sources, but audio output comes from only one selected input source at a time.
| Mode | Audio Behavior |
| Single View / Switch mode | Audio follows the selected input |
| Multiview mode | User selects one input source for audio output |
| Analog L/R output | PCM 2.0 only |
| Audio from all inputs at same time | Not supported |
Use the AUDIO button on the front panel or remote to select the desired audio source in Multiview mode.
IMPORTANT — EDID DIP Switch Is Supported
The HDS-401MV includes an EDID DIP switch for input EDID management.
| EDID DIP Setting | Function |
| 111 | Copy OUT port sink EDID |
| 110 | 4K@30Hz, Audio 2.0ch PCM |
| 101 | 4K@30Hz, Audio 5.1ch PCM |
| 100 | 1080p, Audio 2.0ch PCM |
| 011 | 1080p, Audio 5.1ch PCM |
| 010 | 1920x1200, 2.0ch |
| 001 | 1920x1200, 5.1ch |
| 000 | Defined by RS-232 commands |
Use EDID settings when there is no output, wrong resolution, audio format issues, or source compatibility problems.
IMPORTANT — RS-232 Control Is Supported
The HDS-401MV supports RS-232 command control.
| RS-232 Feature | Support |
| Power control | Supported |
| Input switching | Supported |
| Output resolution control | Supported |
| EDID control | Supported |
| Audio source control | Supported |
| Audio mute control | Supported |
| Auto switching control | Supported |
| Multiview mode control | Supported |
| Window source assignment | Supported |
| Border / OSD / PIP / PBP / Triple / Quad settings | Supported |
Serial settings:
| RS-232 Setting | Value |
| Baud rate | 115200 |
| Data bit | 8 |
| Stop bit | 1 |
| Check bit | 0 |
The manual recommends using a USB-to-RS-232 cable to connect a PC or control system to the RS-232 port.
IMPORTANT — IR Extension Is Supported
The HDS-401MV includes an IR EXT port and IR Receiver cable.
| IR Feature | Support |
| IR remote control | Supported |
| IR EXT port | Supported |
| Included IR Receiver cable | Supported |
| IR level | 5Vp-p |
| IR frequency | Fixed 38kHz |
Use the IR Receiver cable when the device is installed in a rack, cabinet, or closet where the front-panel IR window is not visible.
IMPORTANT — Recommended HDMI Cable Lengths
The manual recommends Premium High Speed HDMI cables.
| Video Resolution | Recommended HDMI Cable Length |
| 4K30 | Up to 5m / 16ft |
| 1080p 4:4:4 | Up to 10m / 33ft |
Use short, high-quality HDMI cables for 4K@30Hz operation.
Poor HDMI cables may cause no output, flickering, signal loss, audio dropouts, or unstable source detection.
Ports and Panel Layout
Front Panel
| Port / Button / Indicator | Function |
| IR window | Receives IR remote control signal |
| Power LED | Green when powered on; red when in standby |
| IN 1 / IN 2 / IN 3 / IN 4 LEDs | Show selected input in Switch mode or selected audio source in Multiview mode |
| AUTO LED | Lights green when Auto Switching is enabled |
| IN 1 / IN 2 / IN 3 / IN 4 buttons | Select input source in Switch mode; select/cycle window input in Multiview mode |
| MV button | Cycles through Single, PIP, PBP, Triple, and Quad display modes |
| AUDIO button | Selects which input source outputs audio in Multiview mode |
| EDID DIP switch | Selects EDID setting |
Rear Panel
| Port | Function |
| OUT | Connect HDMI display such as TV, monitor, or projector |
| IN 1 / IN 2 / IN 3 / IN 4 | Connect HDMI source devices |
| L/R OUT | 3.5mm analog audio output for audio extraction |
| RS-232 | Connect PC or control system for serial command control |
| IR EXT | Connect included IR Receiver cable |
| DC 5V | Connect included power adapter |
Remote Control Functions
| Remote Button | Function |
| Power | Power on the device or set it to standby |
| MUTE | Mute or unmute audio output |
| HD 1 / HD 2 / HD 3 / HD 4 | Select input in Switch mode; select/cycle window input in Multiview mode |
| AUTO | Enable or disable auto switching |
| Left / Right arrows | Cycle input sources in Switch mode |
| AUDIO | Select audio source in Multiview mode |
| 720P / 1080P / 1200P / 4K | Select output resolution |
| OSD | Toggle OSD display: no OSD, input channel display, input channel + borders |
| POS | Set PIP position: top left, bottom left, top right, bottom right |
| SIZE | Set PIP size: large, middle, small |
| Display Mode buttons | Select Single, PIP, PBP, Triple, or Quad modes |
Step-by-Step Setup
- Place the HDS-401MV near the HDMI sources and display.
- Connect HDMI source 1 to IN 1.
- Connect HDMI source 2 to IN 2 if needed.
- Connect HDMI source 3 to IN 3 if needed.
- Connect HDMI source 4 to IN 4 if needed.
Examples include PCs, DVD players, Blu-ray players, TV boxes, media players, cameras, DVRs, NVRs, and HDMI matrix outputs.
- Connect the HDMI OUT port to a TV, monitor, projector, or display.
- If using analog audio extraction, connect L/R OUT to speakers, amplifier, soundbar, or audio system using a 3.5mm audio cable.
- If the unit is mounted in a rack or cabinet, connect the IR Receiver cable to IR EXT and place the IR receiver head where the remote can see it.
- If using RS-232 control, connect the RS-232 Phoenix connector to a PC or control system.
- Connect the included DC 5V power adapter.
- Power on the HDMI sources and display.
- Select the desired EDID setting using the DIP switch.
- Use the front-panel buttons or remote control to select Single View or Multiview mode.
- Select the desired output resolution: 720p, 1080p, 1920x1200, or 4K.
- In Multiview mode, use AUDIO to select which input source outputs audio.
- Test video, audio, display modes, EDID behavior, IR remote, and RS-232 commands.
HDMI Cable Requirement — Critical
Use Premium High Speed HDMI cables.
| HDMI Requirement | Specification |
| 4K30 cable length | Up to 5m / 16ft recommended |
| 1080p cable length | Up to 10m / 33ft recommended |
| HDMI version | HDMI 1.4b |
| HDCP version | HDCP 1.4 |
| Maximum bandwidth | 10.2Gbps |
Poor HDMI cables may cause:
- No output
- Flickering
- Black screen
- Wrong resolution
- HDCP handshake issues
- Audio dropouts
- Input not detected
- Multiview windows not displaying correctly
For troubleshooting, test each HDMI source directly with the display before using the HDS-401MV.
Audio Requirement — Critical
Use compatible audio settings.
| Audio Output | Supported Format |
| HDMI OUT | LPCM 2.0 / 5.1, Dolby 2.0 / 5.1, Dolby Digital Plus, DTS 2.0 / 5.1 |
| 3.5mm L/R OUT | PCM 2.0 |
If using the 3.5mm analog audio output, set the HDMI source audio output to PCM 2.0 or Stereo.
If there is no audio:
- Check if the source audio format is supported by the display.
- If using analog output, make sure the source is set to Stereo or 2.0.
- In Multiview mode, select the correct audio source.
- Check whether MUTE is enabled on the remote.
- Check the 3.5mm audio cable and connected speakers.
EDID Requirement — Critical
Use EDID settings to resolve display or audio compatibility issues.
Try changing EDID if:
- There is no output.
- The source outputs the wrong resolution.
- The display does not detect the signal.
- Audio is not working correctly.
- A 4K source does not display.
- The connected display only supports 1080p.
For most 4K displays, use 4K@30Hz with 2.0ch or 5.1ch audio.
For 1080p displays, use a 1080p EDID setting.
For 1920x1200 displays, use one of the 1920x1200 EDID settings.
Power Requirement — Critical
The HDS-401MV requires DC 5V power.
| Power Detail | Specification |
| Power adapter input | AC 100–240V, 50/60Hz |
| Power adapter output | DC 5V/1A |
| Power consumption | 2.75W max |
If the unit does not power on:
- Check the DC 5V power adapter.
- Confirm the outlet is working.
- Check whether the Power LED is green or red.
- Try power cycling the unit.
Surge protection is recommended.
RS-232 Setup Requirement — Critical
Use the RS-232 Phoenix connector for serial command control.
| Serial Setting | Value |
| Baud rate | 115200 |
| Data bit | 8 |
| Stop bit | 1 |
| Check bit | 0 |
Example RS-232 commands include:
| Command | Function |
| help! | Lists all commands |
| r status! | Gets device status |
| r type! | Gets device model |
| s power 1! | Powers on the device |
| s power 0! | Powers off the device |
| s reboot! | Reboots the device |
| s reset! | Resets to factory defaults |
| s output res 1! | Sets output resolution to 3840x2160p30 |
| s input edid 1! | Sets input EDID to 4K30, 2.0ch |
| s auto switch 1! | Enables auto switching |
| s in source 1! | Routes HDMI input 1 to output |
| s multiview 5! | Selects quad screen mode |
Use RS-232 only if the installation requires control from a PC or third-party control system.
Display Mode Details
| Display Mode | Description |
| Single | One HDMI input displayed full screen |
| PIP | Picture-in-picture layout |
| PBP 1 | Picture-by-picture layout 1 |
| PBP 2 | Picture-by-picture layout 2 |
| Triple 1 | Three-window layout 1 |
| Triple 2 | Three-window layout 2 |
| Quad 1 | Four-window layout 1 |
| Quad 2 | Four-window layout 2 |
In Switch mode, IN 1 / IN 2 / IN 3 / IN 4 buttons select the source.
In Multiview mode, IN 1 / IN 2 / IN 3 / IN 4 correspond to Window 1 / Window 2 / Window 3 / Window 4.
OSD, PIP, Border, and Window Controls
The HDS-401MV supports additional display customization.
| Feature | Control |
| OSD display | Remote OSD button or RS-232 |
| Window border on/off | RS-232 |
| Border color | RS-232 |
| PIP position | Remote POS button or RS-232 |
| PIP size | Remote SIZE button or RS-232 |
| PBP aspect ratio | RS-232 |
| Triple aspect ratio | RS-232 |
| Quad aspect ratio | RS-232 |
OSD options include:
| OSD Mode |
| No OSD |
| Display current input channels |
| Display current input channels and borders |
Understanding the Application Example
The application diagram shows four HDMI sources connected to IN 1 through IN 4, including a PC, DVD or Blu-ray player, and TV box. The HDMI OUT connects to a TV. The L/R OUT connects to 2.0 speakers. The RS-232 port connects to a PC for control, and the DC 5V power adapter powers the unit.
This shows the main use case: several HDMI sources are connected to the HDS-401MV, then displayed individually or together on one TV while audio can be extracted to speakers.
Supported Technical Specifications
| Specification | Support |
| Product Type | 4K HDMI Quad Multi-Viewer Switch |
| Model | HDS-401MV |
| HDMI Compliance | HDMI 1.4b |
| HDCP Compliance | HDCP 1.4 |
| Video Bandwidth | Up to 10.2Gbps |
| Input Resolution | Up to 4K@30Hz |
| Output Resolutions | 720p@60Hz, 1080p@60Hz, 1920x1200@60Hz, 4K@30Hz |
| Color Depth | 8 / 10 / 12-bit |
| Color Space | RGB 4:4:4, YCbCr 4:4:4, YCbCr 4:2:2, YCbCr 4:2:0 |
| HDMI Audio Formats | LPCM 2.0, LPCM 5.1, Dolby 2.0, Dolby 5.1, Dolby Digital Plus, DTS 2.0, DTS 5.1 |
| Analog Audio Output Format | PCM 2.0 |
| HDMI Inputs | 4 x HDMI Type-A, 19-pin female |
| HDMI Output | 1 x HDMI Type-A, 19-pin female |
| Audio Output | 1 x L/R OUT, 3.5mm stereo jack |
| RS-232 | 1 x 3-pin 3.81mm Phoenix connector |
| IR EXT | 1 x 3.5mm stereo jack |
| IR Level | 5Vp-p |
| IR Frequency | Fixed 38kHz |
| Power Supply | DC 5V/1A |
| Power Adapter Input | AC 100–240V, 50/60Hz |
| Power Consumption | 2.75W max |
| Housing | Metal enclosure |
| Color | Black |
| Dimensions | 176mm x 68mm x 18mm / 6.92in x 2.67in x 0.7in |
| Weight | 300g / 10.58oz |
| Operating Temperature | 0°C to 40°C / 32°F to 104°F |
| Storage Temperature | -20°C to 60°C / -4°F to 140°F |
| Operating Humidity | 20%–80% RH, non-condensing |
| Storage Humidity | 10%–90% RH, non-condensing |
| ESD Protection | IEC 61000-4-2: ±8kV air-gap discharge, ±4kV contact discharge |
Package Contents
| Item | Quantity |
| HDS-401MV | 1 |
| Remote | 1 |
| IR Receiver Cable, 1.5m | 1 |
| 3-pin 3.81mm Phoenix Connector, Male | 1 |
| Mounting Ear | 2 |
| Machine Screw, KM3*4 | 4 |
| Power Adapter | 1 |
| User Manual | 1 |
What HDMI Source Devices Is the HDS-401MV Compatible With?
The HDS-401MV can connect to HDMI source devices such as:
- PCs
- Laptops
- DVD players
- Blu-ray players
- TV boxes
- Streaming devices
- Media players
- Cable boxes
- Satellite receivers
- Game consoles
- Cameras with HDMI output
- DVRs
- NVRs
- HDMI switch outputs
- HDMI matrix outputs
For best compatibility, set sources to 4K@30Hz or lower.
What Displays Is the HDS-401MV Compatible With?
The HDS-401MV can connect to display devices such as:
- 4K TVs
- 1080p TVs
- HDMI monitors
- HDMI projectors
- Commercial displays
- Security monitoring displays
- Control room displays
- Classroom displays
- Conference room displays
- Retail displays
The display must support the selected output resolution.
Frequently Asked Questions
Q: What is the HDS-401MV used for?
A: It is used to switch between four HDMI sources or display multiple HDMI sources together on one screen.
Q: Is the HDS-401MV a multi-viewer?
A: Yes. It is a 4K HDMI Quad Multi-Viewer Switch.
Q: How many HDMI inputs does it have?
A: It has four HDMI inputs.
Q: How many HDMI outputs does it have?
A: It has one HDMI output.
Q: Does it support 4K?
A: Yes. It supports up to 4K@30Hz.
Q: Does it support 4K@60Hz?
A: No. 4K@60Hz is not listed. This model supports up to 4K@30Hz.
Q: What HDMI version does it support?
A: It supports HDMI 1.4b.
Q: What HDCP version does it support?
A: It supports HDCP 1.4.
Q: What is the video bandwidth?
A: Up to 10.2Gbps.
Q: What output resolutions are supported?
A: 720p@60Hz, 1080p@60Hz, 1920x1200@60Hz, and 4K@30Hz.
Q: How many display modes does it support?
A: It supports Single, PIP, PBP 1, PBP 2, Triple 1, Triple 2, Quad 1, and Quad 2 display modes.
Q: Can it show all four HDMI inputs at the same time?
A: Yes. Use Quad mode.
Q: Can it show two HDMI inputs side by side?
A: Yes. Use PBP mode.
Q: Can it show picture-in-picture?
A: Yes. PIP mode is supported.
Q: Can it switch one input full screen?
A: Yes. Use Single View / Switch mode.
Q: Does it support seamless switching?
A: Yes. Seamless switching is supported in single-view mode.
Q: Does it support automatic switching?
A: Yes. Auto switching is supported.
Q: How do I enable auto switching?
A: Press AUTO on the remote or use the RS-232 auto switching command.
Q: Does it have analog audio output?
A: Yes. It has a 3.5mm L/R audio output.
Q: Can I get audio from all sources at the same time in Multiview mode?
A: No. Only one input source can output audio at a time in any Multiview mode.
Q: How do I select audio in Multiview mode?
A: Press the AUDIO button on the front panel or remote to select which input source outputs audio.
Q: What audio format does the 3.5mm output support?
A: PCM 2.0.
Q: Does HDMI audio support Dolby and DTS?
A: Yes. HDMI IN/OUT supports LPCM 2.0, LPCM 5.1, Dolby 2.0, Dolby 5.1, Dolby Digital Plus, DTS 2.0, and DTS 5.1.
Q: Does the analog audio output support Dolby or DTS?
A: No. The analog L/R output supports PCM 2.0 only.
Q: What should I do if analog audio does not work?
A: Set the source audio output to Stereo or PCM 2.0 and select the correct audio source.
Q: Does it support EDID management?
A: Yes. EDID can be selected using the DIP switch or RS-232 commands.
Q: What should I do if there is no output?
A: Try a lower source resolution, change the HDMI cable, or change the EDID setting.
Q: Does it support RS-232 control?
A: Yes. RS-232 command control is supported.
Q: What RS-232 baud rate does it use?
A: 115200.
Q: Does it support IR control?
A: Yes. It supports the included remote and IR Receiver cable.
Q: What is the IR EXT port used for?
A: It connects the IR Receiver cable when the unit is installed in a rack, cabinet, or hidden location.
Q: What power adapter does it use?
A: It uses a DC 5V/1A power adapter.
Q: What is the power consumption?
A: The manual lists power consumption as 2.75W max.
Q: What HDMI cable should I use?
A: Use Premium High Speed HDMI cables. For 4K30, use up to 5m / 16ft; for 1080p, use up to 10m / 33ft.
Q: What does the Power LED mean?
A: Green means the device is powered on. Red means the device is in standby.
Q: What does the AUTO LED mean?
A: The AUTO LED lights green when Auto Switching is enabled.
Q: What do the IN 1–4 LEDs mean?
A: In Switch mode, they show the selected input source. In Multiview mode, they show the selected audio output source.
Q: Can I turn OSD on or off?
A: Yes. Use the OSD button on the remote or RS-232 commands.
Q: Can I change PIP position and size?
A: Yes. Use the POS and SIZE buttons on the remote or RS-232 commands.
Q: Can I change window borders?
A: Yes. Window border and border color can be controlled through RS-232.
Q: Does the HDS-401MV need external power?
A: Yes. Connect the included DC 5V/1A power adapter.
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