Read this user manual carefully before using the product. Pictures shown in this
manual are for reference only. Different models and specifications are subject to real
product.
This manual is only for operation instruction, please contact the local distributor for
maintenance assistance. The functions described in this version were updated till
November, 2019. In the constant effort to improve the product, we reserve the right
to make functions or parameters changes without notice or obligation. Please refer
to the dealers for the latest details.
FCC Statement
This equipment generates, uses and can radiate radio frequency energy and, if not
installed and used in accordance with the instructions, may cause harmful
interference to radio communications. It has been tested and found to comply with
the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These
limits are designed to provide reasonable protection against harmful interference in a
commercial installation.
Operation of this equipment in a residential area is likely to cause interference, in
which case the user at their own expense will be required to take whatever
measures may be necessary to correct the interference.
Any changes or modifications not expressly approved by the manufacture would
void the user’s authority to operate the equipment.
Page 3
SAFETY PRECAUTIONS
To ensure the best from the product, please read all instructions carefully before
using the device. Save this manual for further reference.
⚫ Unpack the equipment carefully and save the original box and packing material
for possible future shipment.
⚫ Follow basic safety precautions to reduce the risk of fire, electrical shock and
injury to persons.
⚫ Do not dismantle the housing or modify the module. It may result in electrical
shock or burn.
⚫ Using supplies or parts not meeting the products’ specifications may cause
damage, deterioration or malfunction.
⚫ Refer all servicing to qualified service personnel.
⚫ To prevent fire or shock hazard, do not expose the unit to rain, moisture or install
this product near water.
⚫ Do not put any heavy items on the extension cable in case of extrusion.
⚫ Do not remove the housing of the device as opening or removing housing may
expose you to dangerous voltage or other hazards.
⚫ Install the device in a place with fine ventilation to avoid damage caused by
overheat.
⚫ Keep the module away from liquids.
⚫ Spillage into the housing may result in fire, electrical shock, or equipment
damage. If an object or liquid falls or spills on to the housing, unplug the module
immediately.
⚫ Do not twist or pull by force ends of the cable. It can cause malfunction.
⚫ Do not use liquid or aerosol cleaners to clean this unit. Always unplug the power
to the device before cleaning.
⚫ Unplug the power cord when left unused for a long period of time.
⚫ Information on disposal for scrapped devices: do not burn or mix with general
household waste, please treat them as normal electrical wastes.
Thanks for choosing the professional BZ-UHD-KVM41-KIT HDMI 2.0 4x1 Switcher
with four SC-GRHU table grommets. The switcher features four HDMI video inputs
and one HDMI output. It supports HDMI video resolution up to 4Kx2K@60Hz 4:4:4
HDR 10 and Dolby Vision. The switcher provides one stereo audio output for audio
de-embedding, and provides four type-B USB ports and three type-A USB ports for
KVM management, the four HDMI computers can be controlled via one keyboard,
one mouse and one monitor. In addition, the switcher features four GR ports to
connect SC-GRHU table grommets for source selection and black screen setting.
The switcher can also be controlled via RS232 and front panel buttons.
1.1 Features
⚫ 4x1 HDMI 2.0 Switcher with KVM.
⚫ Supports video resolution up to 4Kx2K@60Hz 4:4:4, HDR 10 and Dolby Vision.
⚫ HDCP 2.2 compliant.
⚫ Compatible with Windows, Linux and Mac OS.
⚫ 3.5mm stereo audio output for audio de-embedding.
⚫ Convenient and cost-effective USB 3.0 peripheral sharing.
⚫ Controls four HDMI computers via one keyboard, one mouse and one monitor.
⚫ KVM auto-switching based on TMDS/5V detection.
⚫ Controllable by buttons, RS232 commands and SC-GRHU table grommets.
⚫ Simplifies wiring for easy installation.
1
Page 6
1.2 Package List
HDMI 2.0 4x1 Switcher:
⚫ 1x BZ-UHD-KVM41-KIT HDMI 2.0 4x1 Switcher
⚫ 2x Mounting Ears with 4 Screws
⚫ 4x Plastic Cushions
⚫ 4x 3-pin Terminal Blocks
⚫ 1x RS232 Cable (3-pin to DB9)
⚫ 1x Power Adapter (12VDC, 2A)
⚫ 1x User Manual
① POWER LED: The LED illuminates red when power is applied.
② PC LEDs: Total four LEDs, any one of which illuminates blue to indicate its
corresponding type-B USB port is connected to an active PC.
③ SOURCE LEDs: Total four LEDs, any one of which illuminates blue to indicate
its corresponding HDMI port is connected to an active source device.
④ SOURCE BUTTONs: Four buttons for input source selection, one of which
illuminates blue to indicate which source device is selected.
⑤ AUTO: Press it to enable auto switching mode, and it will illuminate blue. Press
again can exit auto switching mode.
⑥ FW: Micro-USB port for firmware upgrade.
Note: All the input source LEDs will go out when pressing Black Output button on
the HUG Table Grommet
5
Page 10
3.1.2 Rear Panel
GR4 DC 12VDISPLAY
GR1
GR3
GR2RS232
Tx Rx
OBSMOBSM
SOURCE 1
PC 1PC 2PC 3PC 4
SOURCE 2SOURCE 3SOURCE 4
DEVICES
OBSMOBSM
132
AUDIO OUT
1
4
5
6
8
2
3
7
① SOURCE1~SOURCE4: Four type-A female HDMI input ports to connect HDMI
source devices (PC, Blu-ray Disc™ or DVD player, etc.).
② PC1~PC4: Four type-B USB ports to connect PCs. The PC can be a source
device connected to the corresponding HDMI input port.
③ DEVICES (1~3): Three type-A USB ports to connect USB devices (Keyboard,
Mouse or camera, etc.). These USB devices are used to control the PC which is
connected to the selected HDMI input port and the corresponding type-B USB
port. These type-A USB ports can power these USB devices with 1A.
④ DISPLAY: Type-A female HDMI output port to connect display device (e.g.
Projector).
⑤ AUDIO OUT: 3-pin terminal block to connect speakers or amplifiers for audio
output.
⑥ GR1~GR4: Four 3-pin terminal blocks to connect four SC-GRHU table
grommets for source selection and black screen setting.
⑦ RS232: 3-pin terminal blocks to a control device (e.g. PC) to control the
switcher.
⑧ DC 12V: Power port for power adapter connection.
6
Page 11
3.2 BG-SC-GRHU Table Grommet
BO SM
Show
Me
1
2
5
4
3
6
7
Blank
Output
① Show Me: Press the button to select the HDMI input source.
② Black Output: Press the button to output black screen for display.
All the input source LEDs on the front panel of HUS4 Switcher will go out when
pressing Black Output button.
③ HDMI input port to connect HDMI source device (e.g. PC).
④ Type-B USB port to connect PC.
⑤ HDMI output port to connect the HDMI input port of switcher.
⑥ 3-pin terminal block to connect the GR1~GR4 port of switcher.
⑦ Type-A USB port to connect the type-B USB port of switcher.
7
Page 12
8
4. System Connection
4.1 Usage Precaution
⚫ Make sure all components and accessories included before installation.
⚫ System should be installed in a clean environment with proper temperature and
humidity.
⚫All of the power switches, plugs, sockets, and power cords should be insulated
and safe.
⚫All devices should be connected before power on
4.2 System Diagram
The following diagrams illustrate typical input and output connections that can be
utilized with this switcher:
The switcher is used with four SC-GRHU table grommets:
GR4 DC 12VDISPLAY
GR1
GR3
GR2RS232
Tx Rx
OBSMOBSM
SOURCE 1
PC 1PC 2PC 3PC 4
SOURCE 2SOURCE 3 SOURCE 4
DEVICES
OBSMOBSM
132
AUDIO OUT
MouseKeyboard
Spea ker
Proj ector
Laptop
MacBook
ShowMe
OutputBlack
Show
Me
Output
Black
Show
Me
Output
Black
HDMI:
USB:
Control:
Audio:
HUG
HUG
Page 13
9
The switcher is used alone:
GR4 DC 12VDISPLAY
GR1
GR3
GR2RS232
Tx R x
OBSMOBSM
SOURCE 1
PC 1PC 2PC 3PC 4
SOURCE 2SOURCE 3SOURCE 4
DEVICES
OBSMOBSM
132
AUDIO OUT
Laptop
MouseKeyboard
Blu-Ray
Projector
Speaker
HDMI:
USB:
Control:
Audio:
Page 14
10
5. Button Control
⚫Manual Switching
Press button 1~4 to the corresponding HDMI input source.
⚫Auto Switching
Press AUTO to enable auto switch mode, and then the button LED will illuminate
blue.
When in auto mode, the switcher follows the rules in the certain circumstances:
✓The switcher will automatically switch to the first available active input starting at
input 1 to 4.
✓ Press the source button (1, 2, 3 or 4) can directly change the input source.
✓ New Input: Upon detecting a new input, the switcher will automatically select the
new source.
✓ Detection input signal source: 5V(Default) or TMDS.
✓ Reboot: Once power is restored to the switcher, if the last selected source is still
available, the switcher will still output this signal, otherwise, the switcher will
switch to the first available active input starting at input 1.
✓ Source Removed: When an active source is removed, the switcher will switch to
the first available active input starting at input 1.
✓ Press AUTO again can exit auto switch mode, but the input source will remain
the current setting.
Note: The factory default is auto switching mode.
6. Table Grommet Control
The SC-GRHU table grommet can be used for input source selection and black
screen.
Press Show Me on table grommet to select HDMI source.
Press Black Output on table grommet to let display be black screen.
Page 15
11
7. RS232 Control
Connect the switcher to the control device (e.g. PC) with RS232 cable and set the
parameters in the right manner, the control device is capable to control this switcher
by RS232 commands.
7.1 RS232 Control Software
Installation: Copy the control software file to the computer connected with this
switcher.
Uninstallation: Delete all the control software files in corresponding file path.
Basic Settings
First of all, please connect all needed input devices and output devices, then to
connect it with a computer which is installed with RS232 control software.
Here take the software CommWatch.exe as example.
Double-click the following icon:
Page 16
The interface of the control software is shown as below:
Parameter configuration area
Monitoring area, indicates if the
command sent works.
Command sending area
Please set the parameters of COM number, bound rate, data bit, stop bit and the
parity bit correctly, then the RS232 commands can be sent in Command Sending
Area.
Set the detection method of
HDMI source input to 5V.
@INPUT_SIGNAL_DETECTION 0!
#SET_HDMI_DETECTI
ON_MODE 1
Set the detection method of
HDMI source input to
TMDS.
@INPUT_SIGNAL_DETECTION 1!
#GET_HDMI_DETECTI
ON_MODE
Get the detection method of
HDMI source input.
@INPUT_SIGNAL_DETECTION 0!
@INPUT_SIGNAL_DETECTION 1!
#GET_STATUS
Get the system status.
#FACTORY_RESET
Restore factory default
Note: All commands need to be ended with “<CR><LF>”.
7.2.1 Device Control
@RS232 QUERY STATUS!
@BG-UHD-KVM41-KIT
@V1.0.0
@FRONT PANEL UNLOCK!
@HDMI OUT SWITCH TO AUTO MODE!
@HDMI IN SWITCH TO 1!
@OUTPUT_HDCP 0!
@INPUT_SIGNAL_DETECTION 1!
@IIS OUT ON!
@RS232 BAUDRATE IS 1!
@FACTORY DEFAULT!
@BG-UHD-KVM41-KIT
@V1.0.0
@HDMI OUT SWITCH TO AUTO MODE!
@OUTPUT_HDCP 0!
@IIS OUT ON!
@INPUT_SIGNAL_DETECTION 0!
@HDMI IN SWITCH TO 1!
@USB SWITCH MODE TO 0!
@RS232 BAUDRATE IS 1!
13
Page 18
Command
Description
Command Example and Feedback
#REBOOT
Reboot the device.
@REBOOT
#HELP
Get all commands and its
usage.
7.2.2 Signal Switching
Command
Description
Command Example and
Feedback
#SET_AV H1
Switch to HDMI source 1.
@HDMI IN SWITCH TO 1!
#SET_AV H2
Switch to HDMI source 2.
@HDMI IN SWITCH TO 2!
#SET_AV H3
Switch to HDMI source 3.
@HDMI IN SWITCH TO 3!
#SET_AV H4
Switch to HDMI source 4.
@HDMI IN SWITCH TO 4!
#GET_AV
Get the current HDMI source.
@HDMI IN SWITCH TO 1!
#SET_AUTO_SWITCH
1
Enable auto switching (Factory default).
@HDMI OUT SWITCH TO
AUTO MODE!
#SET_AUTO_SWITCH
0
Disable auto switching
@HDMI OUT SWITCH TO
MANUAL MODE!
#GET_AUTO_SWITCH
Get the auto switching status.
@HDMI OUT SWITCH TO
AUTO MODE!
@HDMI OUT SWITCH TO
MANUAL MODE!
Command
Description
Command Example and
Feedback
#SET_IIS 1
Turn on stereo audio output.
@IIS OUT ON!
#SET_IIS 0
Turn off stereo audio output.
@IIS OUT OFF!
#GET_IIS
Get the stereo audio output status.
@IIS OUT ON!
@IIS OUT OFF!
7.2.3 Audio Setting
14
Page 19
15
7.2.4 EDID Management
Command
Description
Command Example and
Feedback
#SET_EDID_MODE
[PARAM]
[PARAM]= 0000~0011
[PARAM]=0000, set the EDID mode to
Pass-through (Factory default). If the
source device can’t read EDID from
display device, it will use the built-in
EDID: 3840x2160@60Hz Deep Color
Stereo Audio.
[PARAM]=0001/0010/0011, set the EDID
of source device to user-defined EDID
0001/0010/0011.
[PARAM]=0001/0010/0011, upload
user-defined EDID. When the command
applied, system prompts to upload the
EDID file (.bin). Operation will be
cancelled in 10 seconds.
#UPLOAD_USER_EDID
0001
@PLEASE SEND THE
EDID FILE!
… …
@RECEIVED THE FILE,
LENGTH=256!
@EDID0001 UPDATE
SUCCESSFULLY!
7.2.5 HDCP Setting
Command
Description
Command Example and
Feedback
#SET_OUTPUT_HDCP
0
Set the HDCP mode of HDMI output to
PASSIVE mode (Factory default).
The HDCP of HDMI output automatically
follows the HDCP version of source
device.
@OUTPUT_HDCP 0!
#SET_OUTPUT_HDCP
1
Set the of HDMI output to ACTIVE mode.
If the input video has HDCP content, the
@OUTPUT_HDCP 1
Page 20
16
Command
Description
Command Example and
Feedback
HDCP version of HDMI output is HDCP
1.4 for broader video solution.
If the input video has no HDCP content,
the HDMI output has no HDCP too.
#GET_OUTPUT_HDC
P
Get the HDCP mode of HDMI output.
@OUTPUT_HDCP 0!
7.2.6 Baudrate Setting
Command
Description
Command Example and
Feedback
#SET_RS232_BAUD 1
Set RS232 baudrate to 9600.
@RS232 BAUDRATE IS 1!
#SET_RS232_BAUD 2
Set RS232 baudrate to 19200
@RS232 BAUDRATE IS 2!
#SET_RS232_BAUD 3
Set RS232 baudrate to 38400
@RS232 BAUDRATE IS 3!
#SET_RS232_BAUD 4
Set RS232 baudrate to 57600
@RS232 BAUDRATE IS 4!
#SET_RS232_BAUD 5
Set RS232 baudrate to 115200
@RS232 BAUDRATE IS 5!
#GET_RS232_BAUD
Get the RS232 baudrate.
@RS232 BAUDRATE IS 1!
7.2.7 Display Control
Command
Description
Command Example and
Feedback
#SET_THE_DISPLAY_
TO 0
Set the display to output black screen,
and no audio output.
@THE DISPLAY SIDE
SCREEN IS BLACK!
@THE DISPLAY IS
ALREADY OFF!
#SET_THE_DISPLAY_
TO 1
Wake up the display screen.
@WAKE UP THE SCREEN!
@THE DISPLAY IS
ALREADY ON!
#GET_THE_DISPLAY
Get the status of display screen.
@THE DISPLAY IS OFF!
@THE DISPLAY IS ON!
Page 21
8. Firmware Upgrade
Please follow the steps as below to upgrade firmware by the FW port on the front
panel:
1) Prepare the latest upgrade file (.bin) and rename it as “FW_MERG.bin” on PC.
2) Power off the switcher, and connect the FW port of switcher to the PC with USB
cable.
3) Power on the switcher, and then the PC will automatically detect a U-disk named
of “BOOTDISK”.
4) Double-click the U-disk, a file named of “READY.TXT” would be showed.
5) Directly copy the latest upgrade file (.bin) to the “BOOTDISK” U-disk.
6) Reopen the U-disk to check the filename “READY.TXT” whether automatically
becomes “SUCCESS.TXT”, if yes, the firmware was updated successfully,
otherwise, the firmware updating is fail, the name of upgrade file (.bin) should be
confirm again, and then follow the above steps to update again.
7) Remove the USB cable after firmware upgrade.
8) After firmware upgrade, the switcher should be restored to factory default by
sending command.
17
Page 22
9. Panel Drawing
HDMI2 0 4x1 Switcher w USB3 0
. / .
200. 00 mm
40.0 0 mm
100. 00 mm
BOBO
BOBO
Show
Me
Blank
Output
BO SM
76.0 mm
56.0 mm
70.0 mm
BG-UHD-KVM41-KIT Switcher
BG-SC-GRHU Table Grommet
18
Page 23
19
10. Troubleshooting & Maintenance
Problems
Potential Causes
Solutions
Output image with white
noise.
Bad quality of the
connecting cable.
Try another high-quality
cable.
Fail or loose connection.
Make sure the connection
is good
No output image when
switching.
No signal at the input /
output end.
Check with oscilloscope
or multimeter if there is
any signal at the input/
output end.
Fail or loose connection.
Make sure the connection
is good.
The switcher is broken.
Send it to authorized
dealer for repairing.
POWERindicator doesn’t
work or no respond to any
operation.
Fail connection of power
cord.
Make sure the power cord
connection is good.
Cannot control the device
by control device (e.g. a
PC) through RS232 port.
Wrong RS232
communication
parameters.
Type in correct RS232
communication
parameters.
Broken RS232 port.
Send it to authorized
dealer for checking.
If your problem persists after following the above troubleshooting steps, seek further
help from authorized dealer or our technical support.
Page 24
20
11. Customer Service
The return of a product to our Customer Service implies the full agreement of the
terms and conditions hereinafter. There terms and conditions may be changed
without prior notice.
1) Warranty
The limited warranty period of the product is one year.
2) Scope
These terms and conditions of Customer Service apply to the customer service
provided for the products or any other items sold by authorized distributor only.
3) Warranty Exclusion:
⚫ Warranty expiration.
⚫ Factory applied serial number has been altered or removed from the product.
⚫ Damage, deterioration or malfunction caused by:
✓ Normal wear and tear.
✓ Use of supplies or parts not meeting our specifications.
✓ No certificate or invoice as the proof of warranty.
✓ The product model showed on the warranty card does not match with the
model of the product for repairing or had been altered.
✓ Damage caused by force majeure.
✓ Servicing not authorized by distributor.
✓ Any other causes which does not relate to a product defect.
⚫ Shipping fees, installation or labor charges for installation or setup of the
product.
4) Documentation:
Customer Service will accept defective product(s) in the scope of warranty
coverage at the sole condition that the defeat has been clearly defined, and upon
reception of the documents or copy of invoice, indicating the date of purchase,
the type of product, the serial number, and the name of distributor.
Remarks: Please contact your local distributor for further assistance or solutions.
Page 25
21
12. Warranty Information
Second Year Assurance
BZB Gear wants to assure you peace of mind. We're so confident in the quality of
our products that along with the manufacturer's one-year limited warranty, we are
offering free second-year warranty coverage upon registration*!
Taking advantage of this program is simple, just follow the steps below:
1. Register your product within 90 days of purchase by visiting
BZBGear.com/warranty.
2. Complete the registration form. Provide all necessary proof of purchase details,
including serial number and a copy of your sales receipt.
For questions, please call 1.888.660.2962 or email [email protected].
For complete warranty information, please visit BZBGear.com/warranty or scan the
QR code below.
*Terms and conditions apply. Registration is required.
Page 26
13. Mission Statement
BZB Gear manifests from the competitive nature of the audiovisual industry to
innovate while keeping the customer in mind. AV solutions can cost a pretty penny,
and new technology only adds to it. We believe everyone deserves to see, hear, and
feel the advancements made in today’s AV world without having to break the bank.
BZB Gear is the solution for small to medium-sized applications requiring the latest
professional products in AV.
We live in a DIY era where resources are abundant on the internet. With that in mind,
our team offers system design consultation and expert tech support seven days a
week for the products in our BZB Gear catalog. You’ll notice comparably lower prices
with BZB Gear solutions, but the quality of the products is on par with the top brands
in the industry. The unparalleled support from our team is our way of showing we
care for every one of our customers. Whether you’re an integrator, home theater
enthusiast, or a do-it-yourselfer, BZB Gear offers the solutions to allow you to focus
on your project and not your budget.
22
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