English translation of the supplied HDMI 2.1 Mini AutoEDID Fuser Instructions. The wiring, indicator states, button actions and troubleshooting values below follow that document.
VIDEO INPUT 1Main PCGPU HDMI → HDMI1
→
VIDEO MIXERMini FuserDC 12V power
→
VIDEO OUTPUTMain monitorHDMI → display
VIDEO INPUT 2Second PCGPU HDMI → HDMI2
↗
Illustrated wiring overview · click to enlarge
Four steps to get a picture
Turn on both computers. Confirm that PC 1 (main/game PC) and PC 2 (secondary PC) are powered on.
Connect DC 12V power. Press the red Power button. With no video cables connected, a red LP light and flashing blue L3/L4 lights are normal.
Connect all three HDMI ports. HDMI output → main monitor; HDMI2 → PC 2 graphics card; HDMI1 → PC 1 graphics card.
Check normal operation. LP stays red and L1/L2/L3/L4 stay blue. The screen should display normally and automatically adapt to the main monitor's brand/model.
Rear panel · click to enlarge
Front-panel layout · click to enlarge
Front-panel lights and buttons
LP
Power indicator
L1
Main-PC signal light
L2
Secondary-PC signal light
L3
Main/secondary source-switch signal light
L4
Blend-state switch signal light
K1
Short press: switch between main and secondary pictures
K2
Short press: switch blending state; long press: enter the keying-strength value
The Type-C port is for firmware programming and customising the built-in Fuser serial number. The supplier says this factory operation is not open to users.
Original front-panel photo · click to enlarge
If the monitor stays blank
LP red; L3/L4 flashing blue
Check whether the main monitor is connected to power, and whether the other end of the cable at the HDMI1 port is connected to the main monitor. The source says the problem is at the main monitor.
LP red; L1/L2 steady green; L3 flashing; L4 off
From a third computer, remotely connect to PC 2 and set its refresh rate to 60 Hz. Then increase it gradually: 1K: 60 → 120 → 144 → 240 Hz; 2K: 60 → 120 → 144 Hz.
Second PC with AMD integrated or discrete graphics
If the screen remains blank, use a third computer to remotely connect to PC 2. In the AMD graphics driver, set the color depth to 8 bit / 8 bpc: right-click the desktop → AMD settings → Display → Color Depth. The supplied guide names www.amd.com for AMD processor and graphics-card driver support.
02 / FUSER SETUP · TWO DICHEN MODELS
DC Fuser setup · DC240HS and DC255
DC240HS and DC255 have the same wiring, D1 / D2 / H1 / H2 indicator meanings, supported resolutions and refresh rates. Only their K1–K4 button functions differ. The model-specific button sections are kept separate below.
SHARED BY DC240HS + DC255
Wiring and indicator lights
THE TWO MODELS
DC240HSDC255
Same wiring and indicator lights
Main PC GPU→INPUT 1 / HDMI1 HOST
Second PC HDMI→INPUT 2 / HDMI2 SECONDARY
OUTPUT→Main monitor
Power supply→DC 12V
The DC240HS guide identifies Type-C as a program-upgrade port. The supplied DC255 cable guide says not to connect it during normal use.
Indicator meanings for both models
Light
Meaning
D1
Power; steady on is normal.
D2
Blending function; steady on = on, off = off.
H2
HDMI2 / second-PC input signal; steady on is normal.
H1
HDMI1 / main-PC input signal; steady on is normal.
The Power button is the power switch on both models.
Supported display modes for both models
Resolution
Refresh-rate range
1920 × 1080
60–240 Hz
2560 × 1440
60–144 Hz
2560 × 1080
60–200 Hz
3440 × 1440
60–100 Hz
3840 × 2160 · 4K
Up to 60 Hz
Other custom resolutions are also supported. The 3440 × 1440 line is ultrawide resolution, not 4K.
MODEL 01 · DC240HS
DC240HS settings
The DC240HS guide says the Fuser automatically adapts to the display and is plug-and-play. It supports automatic adaptation only; manual parameter injection is not available.
The DC240HS guide specifies a 12V / 2A power supply by default.
Other functions listed by the DC240HS guide: plug-and-play, automatic standby, saved settings, temperature-controlled cooling and very low latency.
For genuine-product tracing and after-sales protection, the supplied guide names dckj686.com. Its anti-counterfeit-code reading tutorial and tool address is wwqt.lanzoum.com/b04wf3l0b, password 6666.
DC240HS · click for original supplied pictureDC255 · product picture · click to enlarge
The supplied product picture states that this is a DICHEN Technology self-developed original product and rejects pirated copies. It prohibits using the product for any act that violates laws or regulations or infringes a third party's rights.
MODEL 02 · SUPPLIED WIRING DIAGRAM
DC255 setup
Set the second PC's desktop background to solid black and move its programs to the opposite side.
Remove the video cable previously connected directly to the screen. The supplied illustration crosses out the old direct display-to-PC connections. Connect only the Fuser, main screen, main PC and second PC using the ports above.
Connect the unit's power supply. All four Fuser lights on means the pictures are overlapped. If there is no overlap, contact support.
01 · Second-PC desktop · click to enlarge02 · Remove direct cables · click to enlarge
03 · Rear-panel ports · click to enlarge
DC240HS button functions
Button
DC240HS action
K1
To be added
K2
To be added
K3
To be added
K4
To be added
DC255 button functions
Button
DC255 action
K1
To be added
K2
To be added
K3
To be added
K4
To be added
03 / FUSER SETUP · DP + HDMI
D60 Fuser setup
English translation of the supplied Latest 4K DP Fuser Quick User Guide. Its main PC and monitor use DisplayPort; the second PC uses HDMI.
THE DEVICED60 FuserDP main path · HDMI second-PC input
Main PC GPU→MAIN DP INPUT
Second PC GPU→HDMI INPUT
MONITOR DP OUTPUT→Main monitor
Supplied adapter→POWER
Normal use · four steps
Before powering the Fuser: connect the power cable, monitor DP cable, main-PC DP cable and second-PC HDMI cable. The HDMI cable may also be connected later.
Press the power button. A red light changing to a steady blue light indicates normal operation. After a few seconds, the monitor should show a picture. Check whether the small screen shows monitor information and information for both inputs.
Choose refresh rates on the main and second PCs. The source says that, in theory, you can select the highest rate shown in the list.
Use the knob: rotate to move to the next item and press to confirm. Set a parameter when the cursor is white; pressing the knob to confirm returns it to the red cursor.
Status shown on the small screen
Main
Main PC resolution and refresh rate
Overlay
Second PC resolution and refresh rate
Monitor
Monitor name and year
Max
Monitor's maximum capability
Display
Current display mode
Mix TH
Keying threshold
PIP size
Picture-in-picture window size
Backlight
Screen backlight state
Core / Board
Core and board temperature
Work time
Time since power-on
Original small-screen illustration from the supplied guide · click to enlarge
The four settings
Setting
Options and source instructions
Display mode
Mix (blended); M Only (main PC only); O Only (second PC only); PIP1–4 (not yet available).
Keying strength
0–250 in increments of 10. The source says about 30 is generally sufficient.
Mode selection
“AOTU” (spelled this way in the source): automatic adaptation for 1K, 2K and 3K; 2K-only; 4K-only. After changing mode, restart the Fuser using the rear red power button.
Backlight duration
10 s; 30 s; 50 s; or On (always on).
Abnormal indicator states
After pressing power
Cause stated in the guide
No light
Board hardware or power-adapter problem.
Red, then no light
DDR or main controller problem.
Red, then flashing blue
Temperature-sensor abnormality.
Red, then flashing green
Not activated, or an occasional abnormality.
SUPPLIED VIDEO
Watch the D60 setup clip
04 / FUSER SETUP · DC1A686
DC686 wiring and controls
DICHEN DC1A686 Fuser manual · Full signal communication (new feature). The manufacturer's own original product; reject counterfeits.
THE DEVICEDC1A686DP 1.4 × 3 · DC 12V / 3A
Main PC GPU→MAIN DP
Second PC GPU→SECONDARY DP
DISPLAY DP→Main monitor
12V / 3A adapter→DC 12V
DATA Type-C is for debugging/upgrades and is optional in normal use. CAPTURE Type-C is only for optional capture and requires USB 3.0 or faster.
Original connector and front-panel photos · click to enlargeOriginal button and indicator instructions · click to enlarge
All buttons · short and long presses
Button
Short press
Long press in the supplied manual
K1
Show parameters in the top-left corner of the monitor.
5 s: reserved function.
K2
Increase keying strength (5–255). Set it to 20 in YCbCr 4:2:2 format.
8 s: change monitor ID, serial number and other identity information with one action; the unit restarts and the power light flashes quickly five times.
K3
Decrease keying strength (5–255). Set it to 20 in YCbCr 4:2:2 format.
3 s: reserved function.
K4
Toggle blend mode.
8 s: factory reset. Restores the monitor's native EDID, keying strength 20 and capture DP0. The power light flashes quickly five times after success.
K5
Switch between separately displayed main and secondary pictures, turning off blending and keying.
3 s: change capture mode between DP0 (main picture only) and DP1 (two-layer blended picture). DP0 is the default.
Power
Push down to power on; release to power off.
—
Indicator lights
Light
State and meaning
Power
Steady on when power is normal.
Display
Steady on when the monitor link succeeds; slow flash while connecting; off if the monitor has no power or is not connected.
Secondary
Steady on when the upper/secondary PC is connected; off if not connected. Check both cable ends and restart the secondary PC if needed.
Main
Steady on when the lower/main PC is connected; slow flash while connecting; off if not connected. Check both cable ends and restart the main PC if needed.
Blend
Steady on when blending is enabled; off when disabled.
Capture
Steady on while capture is connected and used; off when unused.
On-screen parameters · press K1
Field
Meaning
DP0
Main/lower PC resolution and refresh rate; [Y] means this picture is displayed alone.
DP1
Secondary/upper PC resolution and refresh rate; [Y] means this picture is displayed alone.
ALPHA
Keying strength, adjustable from 5 to 255; default 20.
For display modes at or below 1080p 600 Hz, 1440p 360 Hz and 4K 160 Hz, the manual says you can change refresh rate directly in display settings when the mode is available.
If the desired higher rate is not selectable and the monitor's native EDID does not include it, create a custom mode in the graphics-card control panel. Before creating it, set the color format to YCbCr 4:2:2.
After changing color format, create the custom resolution, change the refresh rate and test. If the monitor timing is too high, select CVT-RB, then switch to Manual and adjust total pixels. Older control panels may call this “Coordinated Video Timings (CVT) – Reduced Blanking.”
The manual warns that creating a custom rate without first changing color format may leave the Fuser frozen after restart. Some AMD integrated graphics may freeze when YCbCr 4:2:2 is set manually; in that case, use the default refresh rates in display settings.
If a custom mode leaves the screen blank
The manual gives three recovery methods for either PC and recommends method 1. Delete the custom resolutions, change to YCbCr 4:2:2, then recreate the required resolution.
Change monitor identity with K2. The recovery section says to hold K2 for 5 seconds so the PC detects a new monitor. Delete the previous custom resolutions in NVIDIA Control Panel, change color format to YCbCr 4:2:2 and create the resolution again. Restore the monitor's native information if needed.
Connect the monitor directly. Disconnect the Fuser and connect the monitor directly to the same GPU DP port. Delete the custom resolutions in NVIDIA Control Panel. Reconnect the Fuser to that same port, change to YCbCr 4:2:2 and recreate the resolution.
Use another GPU DP port. Settings for different DP ports are not synchronised in NVIDIA Control Panel. On the new port, change color format first, then create the custom resolution.
The manual says this blank-screen problem occurs only with custom resolutions.
GPU refresh rates listed by the manufacturer
GPU family
720p
1080p
1440p
4K
NVIDIA RTX 50
1000 Hz+
639 Hz
364 Hz
164 Hz
NVIDIA RTX 30 / 40
1000 Hz+
550 Hz+
339 Hz
150 Hz+
NVIDIA GTX 10 / 20
1000 Hz+
480 Hz+
271 Hz
144 Hz+
AMD RX 6000 / 7000
1000 Hz+
639 Hz
364 Hz
164 Hz
AMD RX 500 / 5000
1000 Hz+
480 Hz+
320 Hz
144 Hz
OS, monitor and timing notes
The manual says Windows 10 supports up to 500 Hz; rates above 500 Hz require an updated Windows 11. Some monitors need DSC disabled in their own menu (example: MSI MPG341CQR X36). Others require switching DP 1.2 to DP 1.4, or AV to PC (example: Samsung LS27FG602SCXXF).
Resolution
RTX 50 / RTX 40 suggested range
Minimum total pixels H × V
Common total pixels H × V
1920 × 1080
600–639 / 540–600 Hz
2080 × 1125
2080 × 1215
2560 × 1440
350–364 / 320–339 Hz
2680 × 1481
2720 × 1481 or 2720 × 1525
3840 × 2160
144–164 / 120–144 Hz
4000 × 2200
4000 × 2250 or 4000 × 2332
Monitor-supported limits differ; the manual says users may test the limit of their own display.
Manufacturer information printed in the manual
Huizhou Dichen Technology Co., Ltd., Building 2, Floor 1, Unit 03, No. 113 Zhudong Village, Xiaojinkou Subdistrict, Huicheng District, Huizhou, Guangdong, China. The manual includes an official WeChat service QR code and states that the product must not be used for unlawful acts or to infringe others' rights.
The manual prints a tool-download address at wwqt.lanzoum.com/b04wf3l0b with password 6666. This address has not been independently verified here; use the manufacturer to confirm any software before downloading.
Original manual pages
All eight supplied pages are below for comparison with the English translation. Click a page to enlarge it here.
01 · Cover and manufacturer02 · Ports and buttons03 · Buttons and lights04 · OSD and refresh05 · Recovery and GPU rates06 · Custom timing07 · Monitor notes08 · 4K timing
01 / BOX SETUP · USB INPUT BRIDGE
MAKCU setup and CH343 check
The three USB ports have different jobs. With the ports facing you, the supplied photo shows USB1 left, USB2 middle and USB3 right.
THE DEVICEMAKCUUSB1 · USB2 · USB3
Main PC↔USB1 · LEFT
Second PC↔USB2 · MIDDLE
USB3 · RIGHT↔Mouse
MAKCU ESP32 board driver installation
Plug the mouse into the rightmost USB3 port first, the second PC into the middle USB2 port next, and the main PC into the left USB1 port last.
Download the CH343 driver on the second PC. The address printed in the supplied guide is https://wwwg.lanzouu.com/i7mH32v3f7sh.
Extract the downloaded CH343 driver to any location on the second PC. As shown in the screenshot, right-click the CH343SER installation-information file and select Install; the next screenshot shows the success message.
Open Device Manager on the second PC and check whether USB-Enhanced-SERIAL CH343 appears under Ports (COM & LPT). Note its COM port number; it differs for each person.
Double-click the CH343 port to open Properties. In Port Settings, change Bits per second to 115200 and click OK, as shown in the supplied screenshot.
Check whether the mouse moves normally on the main PC and whether its driver software recognises the mouse. If both work, setup is complete. If the main PC's mouse does not move, the supplied guide says to repeat step 3 to reconnect the device.
Original guide screenshots
01 · USB port order02 · Install CH343SER03 · Installation success04 · Find the COM port05 · Open port properties06 · Set 115200
02 / BOX SETUP · NETWORK CONTROLLER
Kmbox Net Guide
Recommended Hardware
Recommended USB cable — you can use any USB 2.0 or 3.0 cable
Recommended mouse — any wire or wireless mouse
If you don’t have a Second PC we recommend — Mini PC
Recommended OS — Windows 10 on both computers
Connecting Kmbox Net
All software setup/installation is done on the second computer that is connected to the DMA card by way of USB. DO NOT install/setup this software into the main computer in which you installed the DMA card into the motherboard’s PCIe slot. Installing files onto the wrong computer may result in detection.
Connect the Kmbox according to the picture below. After you connected kmbox it should show this image on the screen.
Run 2. WCHUSBNIC as admin on second PC (and all next steps do on second PC).
Select INSTALL.
You should see a Driver Install Success!
Reboot second PC.
Make sure that your main and second PCs are connected to the same local network (for example, your home Wi-Fi).
Open Control Panel on your second PC.
Go to Network and Internet.
Go to Network and Sharing Center.
Open Change adapter settings.
If you have done everything correctly, you will see a device with a description of “USB 2.0 Ethernet Adapter”. If you don't see this device, disconnect and reconnect the cable from the Kmbox to the second PC. Right-click on this device and go to Properties.
Make sure “Internet Protocol Version 6 (TCP/IPv6)” is disabled.
Make sure “Internet Protocol Version 4 (TCP/IPv4)” is enabled. Click on it and go to Properties.
Set the properties to look exactly like this: IP address: 192.168.2.100; Subnet mask: 255.255.255.0; leave the other fields empty. And click OK.
Your Kmbox Net is ready. The first time you use it, you need to enter the Kmbox data.
If, like me, your loader says the Kmbox network connection is good, you have done everything correctly.
03 / BOX SETUP · FERRUM ONE
Ferrum connection check
Ferrum's own documentation names its two computer connections Output and Input. Use those printed names on your device; do not assume the ports have the same left-to-right order as MAKCU or KMBox.
THE DEVICEFerrum OneOutput PC · Input PC · physical mouse
Main / gaming PC↔OUTPUT USB-C
Second / control PC↔INPUT USB-C
MOUSE INPUT↔Physical mouse
Use a separate mouse directly on the control PC if you need to operate that computer while testing pass-through.
First connection
Match the labels. Connect Output to the main PC, Input to the control PC, and the physical mouse to its designated input.
Verify ordinary mouse movement on the main PC before opening any companion software. Re-seat the mouse and both USB cables if pass-through fails.
On the control PC, use the Ferrum companion app provided for your device and firmware. Follow its connection and update prompts; do not install an unrelated “Ferrum” application.
Run a basic cursor test in compatible software only after the app reports the device ready. If the test fails, recheck the Input connection and software mode.
Important distinction
Output
The computer receiving the mouse output
Input
The computer running the control software
Legacy
Direct CP210x serial access is a separate, older API mode
The current software API and legacy serial API are not the same setup. Avoid changing COM speed or installing third-party drivers until the exact mode is known.
Install the driver and Utility on the Input PC
Get the driver and Ferrum Utility supplied for your exact Ferrum One. Install them on the Input PC, not the Output PC. Avoid unrelated downloads with the same product name.
If your trusted package includes a Driver folder with silabser.inf, right-click that file and choose Install. Confirm that Windows reports a successful driver installation.
Run the matching Ferrum installer on the Input PC. Complete setup, open Ferrum Utility, and restart the PC if the installer asks you to.
After restarting, reopen Ferrum Utility. If that trusted Utility offers an update, follow its prompts and keep the USB cables connected until it finishes.
Check that Ferrum Utility shows the device connected. Read the current COM port from Serial API or the network details from Net API; use the same mode and values in your compatible software.
Test the connection and find faults
First move the physical mouse and check that the cursor moves on the Output PC. Use a separate mouse connected directly to the Input PC to control that computer.
If mouse pass-through fails, reconnect the mouse and both USB cables, try a known data-capable cable or another USB port, then restart both PCs.
If Ferrum Utility cannot find the device, check that Input reaches the second PC. In Windows Device Manager, look for the CP210x serial device or a warning icon; reinstall only the matching driver if needed.
If the physical mouse works but the software cursor test fails, confirm the Utility shows Ferrum connected. Match the API mode and current COM or network details, then repeat the test on the Output PC.
If one mouse still fails, check its maker's official firmware or try another mouse. Send support the Ferrum model, Utility status, and the step that failed.
Do not disable Secure Boot, Memory Integrity, or other Windows protections as a routine troubleshooting step. Ask for a compatible, properly signed driver instead.
D60 FuserDP main path · HDMI second-PC input
DC1A686DP 1.4 × 3 · DC 12V / 3A
MAKCUUSB1 · USB2 · USB3
Ferrum OneOutput PC · Input PC · physical mouse