What Is the UKM-401MV?
The OREI UKM-401MV is a 4-input seamless KVM switch with USB 3.0 and Multiview functionality. It allows you to connect up to four computers and control them using one keyboard, mouse, and display.
The UKM-401MV is useful for users who need to manage multiple computers from one workstation, such as office setups, control rooms, production systems, security monitoring stations, IT workstations, and professional AV environments.
The device supports HDMI 2.0b and HDCP 2.2, with a video bandwidth of 18Gbps and video resolutions up to 4K@60Hz 4:4:4. It also includes a built-in 3-port USB 3.1 Gen 1 hub with data transfer speeds up to 5Gbps, allowing shared USB devices such as printers, scanners, webcams, USB drives, and hard drives to be used between connected computers.
The UKM-401MV also works as a Multiviewer with multiple display layouts, allowing you to view more than one connected computer on the same display.
IMPORTANT — UKM-401MV Is a Single-Display KVM Switch
The UKM-401MV has one HDMI output.
This means it can control up to four computers using one keyboard, mouse, and display, but it does not support a dual-monitor setup.
If you have one computer with two displays or want to use four PCs with two monitors, use the UKM-201-2C instead, but that is limited to two computers only.
IMPORTANT — Each Computer Needs HDMI and USB Connected
Each computer needs both an HDMI connection and a USB connection to the UKM-401MV.
For example:
- Computer 1 HDMI goes to HD 1
- Computer 1 USB goes to HOST 1
- Computer 2 HDMI goes to HD 2
- Computer 2 USB goes to HOST 2
If HDMI is connected but the matching USB cable is not connected, you may get video on the display, but the keyboard and mouse will not control that computer.
If your computer does not have a USB Type-B port, you can use a USB-A to USB-B cable. Four USB-A to USB-B cables are included in the package.
IMPORTANT — Multiview Mode Can Show Multiple Computers on One Screen
The UKM-401MV supports Multiview display layouts, allowing multiple connected computers to appear on one display at the same time.
Supported modes include:
- Single
- PIP
- PBP 1
- PBP 2
- Triple 1
- Triple 2
- Quad 1
- Quad 2
In Multiview mode, the yellow border shows which window currently has keyboard, mouse, and USB control. By default, the yellow border appears on Window 1. The INPUT button can move the yellow border between windows.
This is important because a customer may see multiple computers on the screen, but the keyboard and mouse only control the window selected by the yellow border.
IMPORTANT — USB 3.0 Sharing Supports Data Devices, Not Video Output
The UKM-401MV includes USB 3.0 ports for sharing USB devices between computers.
These USB ports can be used for devices such as:
- Keyboard
- Mouse
- Printer
- Scanner
- Webcam
- USB flash drive
- External hard drive
The USB ports do not create additional monitor outputs and do not transmit video by themselves.
IMPORTANT — Audio Extraction Has Format Limits
The UKM-401MV includes Optical and RCA L/R audio outputs.
The RCA L/R output supports PCM 2.0 stereo audio only.
The Optical output supports Dolby Digital, DTS 5.1, and PCM 2.0.
The UKM-401MV does not support HBR audio.
If using the RCA L/R output and there is no audio, set the computer or source device audio output to PCM or Stereo.
IMPORTANT — Seamless Switching and Multiview Behavior Are Different
The UKM-401MV supports seamless switching in single-screen mode and Multiview functionality for viewing multiple computers on one display.
In single-screen mode, the selected computer fills the screen.
In Multiview mode, the display is divided into layouts such as PIP, PBP, Triple, or Quad. The video may be scaled or resized to fit the selected layout.
Ports and Panel Layout
| Port / LED / Button | Location | Function |
| Power Button | Front panel | Press to power on; long press for 1 second to enter standby mode |
| Power LED | Front panel | Green when powered on; red when in standby |
| Input LEDs 1–4 | Front panel | Shows selected input in single mode; all active input LEDs light in Multiview mode |
| AUTO LED | Front panel | Green when auto switching is enabled |
| IR Window | Front panel | Receives IR remote signal |
| AUTO Button | Front panel | Enables automatic switching in single-screen mode |
| INPUT Button | Front panel | Switches input in single mode; moves yellow USB/control border in Multiview mode |
| Multiview Button | Front panel | Cycles through Single, PIP, PBP, Triple, and Quad display modes |
| RES Button | Front panel | Changes HDMI output resolution |
| Front USB 3.0 Port | Front panel | Connect USB devices such as flash drives, printers, and other peripherals |
| RCA L/R Output | Rear panel | PCM 2.0 stereo analog audio output |
| Optical Output | Rear panel | Digital Optical audio output |
| HDMI Output | Rear panel | Connects to the display |
| HDMI Inputs HD 1–4 | Rear panel | Connects to the HDMI output of each computer |
| RS-232 Port | Rear panel | 3-pin Phoenix connector for RS-232 control |
| IR EXT Port | Rear panel | Connect the included IR receiver cable |
| DC 12V | Rear panel | Connect the included 12V/2.5A locking power adapter |
| Hotkey ON/OFF Switch | Rear panel | Enables or disables keyboard and mouse hotkey switching |
| Wire Remote Port | Rear panel | Reserved for KVM upgrade or customized keyboard |
| Keyboard / Mouse USB Ports | Rear panel | Connect a keyboard and mouse |
| HOST 1–4 USB Ports | Rear panel | Connect USB cables from each computer |
| 2x Rear USB 3.0 Ports | Rear panel | Connect USB devices such as flash drives, printers, and other peripherals |
Step-by-Step Setup
- Connect the included 12V/2.5A locking power adapter to the UKM-401MV.
- Connect the HDMI output of Computer 1 to HD 1 on the UKM-401MV.
- Connect the USB cable from Computer 1 to HOST 1 on the UKM-401MV.
- Repeat the same process for Computer 2, Computer 3, and Computer 4.
- Connect the HDMI OUTPUT port on the UKM-401MV to your TV, monitor, or projector.
- Connect your keyboard and mouse to the dedicated USB keyboard and mouse ports.
- Connect any shared USB devices, such as a printer, USB drive, webcam, or hard drive, to the USB 3.0 ports.
- If using external audio, connect:
- RCA L/R output to a stereo audio system
- Optical output to an Optical/TOSLINK soundbar, AVR, or amplifier
- Turn on the computers, display, and UKM-401MV.
- Use the front panel buttons, IR remote, hotkeys, OSD menu, control software, or RS-232 commands to switch between computers and display modes.
HDMI Cable Requirement — Critical
It is recommended to use Premium High-Speed HDMI 2.0 cables under 30 feet for best performance.
Understanding KVM Switching
The UKM-401MV allows one keyboard, mouse, and display to control four computers.
In single-screen mode, selecting an input switches the display, keyboard, mouse, and USB control to that computer.
For proper KVM operation, each computer must be connected with both:
- HDMI cable for video
- USB cable for keyboard, mouse, and USB device sharing
If HDMI is connected but USB HOST is not connected, you may see the computer video, but the keyboard and mouse will not control that computer.
Understanding Multiview Modes
The UKM-401MV supports multiple display layouts:
| Mode | Description |
| Single | Shows one computer full screen |
| PIP | Picture-in-picture mode |
| PBP 1 | Picture-by-picture layout option 1 |
| PBP 2 | Picture-by-picture layout option 2 |
| Triple 1 | Three-window layout option 1 |
| Triple 2 | Three-window layout option 2 |
| Quad 1 | Four-window layout option 1 |
| Quad 2 | Four-window layout option 2 |
In PIP mode, users can select the inputs, sub-window size, and sub-window position.
In PBP, Triple, and Quad modes, users can select inputs, display mode, and aspect ratio.
Understanding the Yellow Border in Multiview Mode
In Multiview mode, the yellow border shows which window is currently assigned to the keyboard, mouse, and USB devices.
The yellow border is on Window 1 by default.
Use the INPUT button to move the yellow border between windows.
Window sequence:
| Mode | Yellow Border Sequence |
| PIP | WIN1 → WIN2 → WIN1 |
| PBP | WIN1 → WIN2 → WIN1 |
| Triple | WIN1 → WIN2 → WIN3 → WIN1 |
| Quad | WIN1 → WIN2 → WIN3 → WIN4 → WIN1 |
This helps users control the correct computer while viewing multiple computers on one screen.
Understanding Auto Switching
Auto switching only works in single screen display mode.
When Auto mode is enabled, the AUTO LED turns green. If the current computer is disconnected or turned off, the KVM automatically switches to the next active input.
Auto switching is not intended for Multiview layouts.
Understanding Hotkey Switching
The UKM-401MV supports keyboard and mouse hotkey switching which allows you to press certain shortcut keys using the keyboard and mouse to switch between the inputs, change Multiview modes, etc.
The Hotkey ON/OFF switch on the rear panel enables or disables hotkey control.
When the Hotkey switch is OFF, hotkey switching is disabled.
When the Hotkey switch is ON, keyboard and mouse hotkeys can be used to operate the device.
Common keyboard hotkeys include:
| Hotkey | Function |
| Ctrl + Ctrl + 1 | Switch to HDMI Input 1 and USB Host 1 |
| Ctrl + Ctrl + 2 | Switch to HDMI Input 2 and USB Host 2 |
| Ctrl + Ctrl + 3 | Switch to HDMI Input 3 and USB Host 3 |
| Ctrl + Ctrl + 4 | Switch to HDMI Input 4 and USB Host 4 |
| Ctrl + Ctrl + A + 1 | Select Input 1 audio |
| Ctrl + Ctrl + A + 2 | Select Input 2 audio |
| Ctrl + Ctrl + A + 3 | Select Input 3 audio |
| Ctrl + Ctrl + A + 4 | Select Input 4 audio |
| Ctrl + Ctrl + F1 | Switch to PIP mode or cycle PIP position |
| Ctrl + Ctrl + F2 | Switch to PBP mode or cycle PBP 1 / PBP 2 |
| Ctrl + Ctrl + F3 | Switch to Triple mode or cycle Triple 1 / Triple 2 |
| Ctrl + Ctrl + F4 | Switch to Quad mode or cycle Quad 1 / Quad 2 |
| Ctrl + Ctrl + F12 | Enable or disable buzzer |
| Ctrl + Ctrl + M + E | Enable the mouse hotkey function |
| Ctrl + Ctrl + M + D | Disable the mouse hotkey function |
| Ctrl + Ctrl + R + E | Enable the mouse roaming function |
| Ctrl + Ctrl + R + D | Disable the mouse roaming function |
| Ctrl + Ctrl + A + E | Unmute audio |
| Ctrl + Ctrl + A + D | Mute audio |
| Ctrl + Ctrl + Page Up |
In single screen display mode: Switch to the next input. In Multiview mode: Switch to the HOST of the next window. |
| Ctrl + Ctrl + Page Down |
In single screen display mode: Switch to the previous input. In Multiview mode: Switch to the HOST of the previous window. |
| Ctrl + Ctrl + Space Bar | Switch to the previous selection, including the display mode switching or the input switching in single screen display mode. |
| Ctrl + Ctrl + Tab + Enter |
Open the OSD menu to control and operate the OSD through the keyboard. Use the arrow keys to navigate the OSD menu Tap the “Backspace” button to return to the previous level; Tap “Enter” button to confirm the operation; Tap “Esc” button to exit the OSD menu. |
The device also supports mouse hotkeys, which are as follows:
| Hotkey | Function |
| Double-click the mouse scroll wheel, and then click the right button |
In single screen display mode: Switch to the next input. In Multiview mode: Switch to the HOST of the next window. |
| Double-click the mouse scroll wheel, and then click the left button |
In single screen display mode: Switch to the previous input. In Multiview mode: Switch to the HOST of the previous window |
| Triple-click the mouse scroll wheel | Switch to the previous selection, includes mode switching in Multiview mode or input switching in single screen display mode |
EDID Settings
The UKM-401MV includes EDID management. EDID can be selected through RS-232 commands, OSD menu navigation, or control software.
| No. | EDID Mode |
| 1 | 4K@60Hz-2.0 |
| 2 | 4K@60Hz-5.1 |
| 3 | 4K@60Hz-7.1 |
| 4 | 4K@30Hz-2.0 |
| 5 | 4K@30Hz-5.1 |
| 6 | 4K@30Hz-7.1 |
| 7 | 1080p-2.0 |
| 8 | 1080p-5.1 |
| 9 | 1080p-7.1 |
| 10 | 1920x1200-2.0 |
| 11 | 1680x1050-2.0 |
| 12 | 1600x1200-2.0 |
| 13 | 1440x900-2.0 |
| 14 | 1360x768-2.0 |
| 15 | 1280x1024-2.0 |
| 16 | 1024x768-2.0 |
| 17 | 720p-2.0 |
| 18 | AUTO |
| 19 | USER1 |
Use 2.0 EDID modes for stereo audio setups.
Use 5.1 or 7.1 EDID modes when the connected audio system supports surround sound.
Use AUTO when you want the device to follow the detected display/audio capabilities.
Understanding Output Resolution
The UKM-401MV supports multiple output resolutions using a built-in scaling engine.
| No. | Output Resolution |
| 1 | 4096x2160p 60Hz |
| 2 | 4096x2160p 50Hz |
| 3 | 3840x2160p 60Hz |
| 4 | 3840x2160p 50Hz |
| 5 | 3840x2160p 30Hz |
| 6 | 3840x2160p 25Hz |
| 7 | 1920x1200p 60Hz RB |
| 8 | 1920x1080p 60Hz |
| 9 | 1920x1080p 50Hz |
| 10 | 1360x768p 60Hz |
| 11 | 1280x800p 60Hz |
| 12 | 1280x720p 60Hz |
| 13 | 1280x720p 50Hz |
| 14 | 1024x768 60Hz |
| 15 | AUTO |
Press the RES button to show or change the output resolution.
Long press the RES button for 3 seconds to switch the output resolution to 720p60. This is useful if the display does not support the current output resolution and you need to recover the picture.
Understanding Audio Output
The UKM-401MV supports HDMI audio, Optical audio, and RCA L/R audio.
| Output | Supported Audio |
| HDMI | PCM 2.0 / 5.1 / 7.1, Dolby Digital/Plus/EX, DTS, DTS-96/24, DTS High Res, DSD |
| Optical | Dolby Digital, DTS 5.1, PCM 2.0 |
| RCA L/R | PCM 2.0 only |
Users can select which input the audio comes from and can control volume for LPCM audio.
If using RCA L/R and there is no audio, set the computer/source audio output to PCM or Stereo.
Understanding the OSD Menu
The UKM-401MV includes an OSD menu for advanced configuration.
The IR remote includes these OSD navigation buttons:
- MENU
- EXIT
- UP
- DOWN
- LEFT
- RIGHT
- OK
Through the OSD menu, users can adjust:
- Output resolution
- Multiview layout
- Window source assignment
- PIP position
- PIP size
- PBP mode
- Triple mode
- Quad mode
- Aspect ratio
- Audio source
- Audio volume
- Audio mute
- Language
- EDID mode
- Baud rate
- Factory reset
- Firmware version
Control Software and RS-232 Control
The UKM-401MV can be controlled using control software or RS-232 commands.
The control software connects through RS-232 using a 3-pin Phoenix connector and USB-to-RS-232 serial cable.
Supported RS-232 settings include:
| Setting | Value |
| Baud Rate | 115200 default, also supports 57600, 38400, 19200, 9600 |
| Data Bits | 8-bit |
| Stop Bits | 1 |
| Check Bit | 0 |
RS-232 and control software can be used to control power, output resolution, EDID, audio source, volume, mute, auto switching, input selection, Multiview mode, mouse roaming, USB window selection, and more.
What Computers Is the UKM-401MV Compatible With?
The UKM-401MV is compatible with Windows and Mac computers and does not require additional drivers for basic plug-and-play operation.
It can be used with:
- Desktop PCs
- Laptops with HDMI output
- Mac computers with HDMI output or proper HDMI adapter
- Windows workstations
- Mini PCs
- Media PCs
- Control room PCs
- Security monitoring PCs
Each computer should have HDMI output and USB connection available.
What USB Devices Can Be Shared?
The UKM-401MV can share USB devices between connected computers, including:
- Keyboard
- Mouse
- USB flash drives
- External hard drives
- Printers
- Scanners
- Webcams
- USB audio devices
- Other USB peripherals
USB 3.0 ports support USB 3.1 Gen 1 speeds up to 5Gbps when connected with compatible computers, cables, and devices.
Frequently Asked Questions
Q: What is the OREI UKM-401MV used for?
A: The UKM-401MV is a KVM Switch used to control up to four computers with one keyboard, mouse, and display. It also supports USB 3.0 sharing, audio extraction, and Multiview layouts.
Q: Can I use two monitors with this product?
A: No. The UKM-401MV has one HDMI output, so it does not support a dual-display setup.
Q: Can I view all four computers at the same time?
A: Yes. Use Quad mode to view four connected computers on one display.
Q: Which computer does my keyboard and mouse control in Multiview mode?
A: The keyboard and mouse control the window marked by the yellow border. Use the INPUT button or hotkeys to move the yellow border to another window.
Q: Does the UKM-401MV support USB 3.0?
A: Yes. It includes USB 3.0 / USB 3.1 Gen 1 ports with data transfer speeds up to 5Gbps.
Q: Why can I see the video but my keyboard and mouse do not control the computer?
A: Make sure the USB HOST cable for that computer is connected to the matching HOST port. If only HDMI connection from the computer is made, the keyboard and mouse control won’t work.
Q: Can I use this KVM if my display and USB peripherals are in another room?
A: Yes, but you may need an extender. The manual suggests compatible extender models such as UHD-EXB330CU-K, UHD-EXB330AUR-K, UHD-EXB350EAU-K, and BK-EXB330EAU-K for remote setups.
Q: Does the UKM-401MV have audio extraction?
A: Yes. It has Optical and RCA L/R audio outputs.
Q: How do I enable hotkey switching?
A: Set the Hotkey switch on the rear panel to ON.
Q: How do I switch to Computer 1 using the keyboard?
A: Use “Ctrl + Ctrl + 1” shortcut when hotkey switching is enabled.
Q: Can I control the device through RS-232?
A: Yes. The UKM-401MV supports RS-232 control using the 3-pin Phoenix connector.
Q: Does the UKM-401MV require drivers?
A: Driver installation is not required to use the UKM-401MV.
Q: What is the difference between the UKM-401 and the UKM-401MV?
A: The UKM-401 is a standard 4-input KVM Switch with USB 2.0 support. The UKM-401MV supports USB 3.1 Gen 1 providing 5Gbps speed, hotkey switching for easy control, seamless switching and Multiview modes. The UKM-401MV could be a better choice if you need high speed USB support and want to view multiple computers on the screen at the same time.
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