BG-PS21-4K
2-Port 4K 18Gbps UHD KVM Presentation Switcher with
HDMI/USB-C Inputs and HDMI Output
User Manual
BZBGEAR BG-PS21-4K PRODUCT MANUAL
Address: 830 National Drive #140, Sacramento, CA 95834, USA · Tel: +1(888)499-9906 · Email: support@bzbgear.com 2
BZBGEAR BG-PS21-4K PRODUCT MANUAL
TABLE OF CONTENTS
Statement 4
Safety Precaution 4
Introduction 5
Features 5
Packing List 5
Technical Specifications 6
Operation Controls and Functions 7
Button Control 9
RS232 Control 11
Troubleshooting & Maintenance 16
Application Example 17
Tech Support 18
Limited Product Warranty Terms 18
Mission Statement 18
Copyright 18
Address: 830 National Drive #140, Sacramento, CA 95834, USA · Tel: +1(888)499-9906 · Email: support@bzbgear.com 3
BZBGEAR BG-PS21-4K PRODUCT MANUAL
Statement
Please read these instructions carefully before connecting, operating, or configuring this
product. Please save this manual for future reference.
Safety Precaution
● 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.
● To prevent damaging this product, avoid heavy pressure, strong vibration, or immersion
during transportation, storage, and installation.
● Do not dismantle the housing or modify the module.
● Using supplies or parts not meeting the products’ specifications may cause damage,
deterioration or malfunction.
● Do not put any heavy items on the extension cable in case of extrusion.
● Install the device in a place with fine ventilation to avoid damage caused by overheat.
● Do not twist or pull by force ends of the optical cable. It can cause malfunction.
● The housing of this product is made of organic materials. Do not expose to any liquid,
gas, or solids which may corrode the shell.
● Unplug this device during lightning storms.
● Do not use liquid or aerosol cleaners to clean this unit. Clean only with a soft dry
microfiber cloth.
● Always unplug the power to the device before cleaning.
● If an object or liquid falls or spills on to the housing, unplug the module immediately.
● To prevent the risk of electric shock, do not open the case. Installation and maintenance
should only be carried out by qualified technicians.
● Do not use the product beyond the specified temperature, humidity, or power supply
specifications.
● This product does not contain parts that can be maintained or repaired by users.
Damage caused by dismantling the product without authorization from BZBGEAR is not
covered under the warranty policy.
● Installation and use of this product must strictly comply with local electrical safety
standards.
● Product specifications may be subject to technical upgrades without further notice.
● 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.
Address: 830 National Drive #140, Sacramento, CA 95834, USA · Tel: +1(888)499-9906 · Email: support@bzbgear.com 4
BZBGEAR BG-PS21-4K PRODUCT MANUAL
Introduction
The BG-PS21-4K is designed to switch an HDMI input or USB-C input to one HDMI output.
It supports video resolutions up to 4K2K@60Hz 4:4:4 8bit, 1080p, and 3D. In addition, there
are smart built-in EDID settings that can be selected by using the 4-pin DIP switch on the
front panel.
The switcher supports stereo and multichannel audio on the HDMI inputs. This unit is also
capable of embedding audio into the HDMI output stream. The audio is simultaneously
de-embedded to a balanced analog audio output. It also supports device extension by
providing one type-B USB port for a host connection, and two type-A USB ports for HID
devices such as camera, microphone, keyboard etc.
The switcher features multiple methods of control. When in the AUTO mode, the switcher
will automatically switch to the first detected source device. When the active source is
removed, the switcher will switch to the lowest numbered input. The switcher can also be
manually controlled through the front panel buttons and RS232 commands. CEC allows the
display device to be controlled by the front panel buttons and RS232 CEC commands if
supported.
Features
● 18G 2x1 switcher with HDMI and USB-C inputs.
● Automatic switching.
● Controllable via front panel buttons and RS232.
● HDMI 2.0, 4Kx2K@60Hz 4:4:4, HDR 10, Dolby Vision, HDCP 2.2.
● Provides charging on the USB-C port up to 40W.
● Provides USB data (USB 3.0/2.0) and 4K video transmission on USB-C port.
● Balanced analog audio for audio de-embedding.
● Peripheral units (e.g. microphone and camera) can be connected by type-A USB
(USB 3.0/2.0) ports and automatically switched along with HDMI and USB-C input
as USB DEVICES for corresponding HOST.
● Smart EDID management capable for various applications and customized settings.
● Front panel buttons trigger both CEC and RS232 commands for display control.
(ON, OFF, MUTE, VOL+, VOL -).
Packing List
● 1x BG-PS21-4K 2x1 Presentation Switcher
● 2x Mounting Ears with 4 Screws
● 4x Plastic Cushions
● 1x 5-pin Terminal Block
● 1x RS232 Cable (3-pin terminal block to DB9)
● 1x Power Cord
● 1x Power Adapter (24V DC,
2.71A)
● 1x User Manual
● 1х Quick Start Guide
Address: 830 National Drive #140, Sacramento, CA 95834, USA · Tel: +1(888)499-9906 · Email: support@bzbgear.com 5
BZBGEAR BG-PS21-4K PRODUCT MANUAL
Technical Specifications
Video
Video Input
(1) HDMI, (1) USB-C
Video Input Connector
(1) Type-A female HDMI, (1) Type-C USB
HDMI Input Resolution
Up to 4Kx2K@60Hz 4:4:4 8bit
USB-C Input Resolution
Up to 4Kx2K@30Hz 4:4:4
Video Output
(1) HDMI
Video Output Connector
(1) Type-A female HDMI
HDMI Output Resolution
Up to 4Kx2K@60Hz 4:4:4 8bit
HDMI Version
2.0
HDCP Version
2.2
USB Version
3.0
HDR 10
Supported
CEC
Supported
HPD
Supported
Audio
Audio Output
(1) AUDIO OUT (Stereo balanced L/R)
Audio Output Connector
(1) 5-pin terminal block
HDMI Audio Format
LPCM 7.1 audio, Dolby Atmos®, Dolby® TrueHD, Dolby Digital® Plus, DTS: X™,
and DTS-HD® Master Audio™ pass-through
Stereo balanced L/R audio Format
PCM
Max Output Level
2.0Vrms ± 0.5dB. 2V = 16dB headroom above -10dBV (316mV) nominal consumer
line level signal
THD+N
<0.05% (-80dB), 20Hz ~ 20KHz bandwidth, 1KHz sine at 0dBFS level (or max
level)
SNR
>80dB, 20Hz ~ 20KHz bandwidth
Crosstalk Isolation
>70dB, 10KHz sine at 0dBFS level (or max level before clipping)
L-R Level Deviation
< 0.3dB, 1KHz sine at 0dBFS level (or max level before clipping)
Frequency Response Deviation
<±0.5dB 20Hz ~ 20KHz
Output Load Capability
1KΩ and higher (supports 10x paralleled 10KΩ loads)
Stereo Channel Separation
>70dB@1KHz
Control Part
Control
(1) EDID, (1) FW, (1) RS232, (1) HOST, (2) DEVICE
Control Connector
(1) 4-pin DIP switch, (1) Micro-USB, (1) 3-pin terminal block, (1) Type-B USB 3.0,
(2) Type-A USB 3.0
General
HDMI 2.0 Cable Length
4K@60Hz 4:4:4 ≤ 5m, 4K@60Hz 4:2:0 ≤ 10m, 1080P ≤ 15m
Bandwidth
18Gbps
Operation Temperature
14°F ~ 131°F / -10°C ~ +55°C
Storage Temperature
-13°F ~158°F / -25°C ~ +70°C
Relative Humidity
10% ~ 90%
External Power Supply
Input: AC 100~240V, 50/60Hz, Output: 24V DC 2.71A
Power Consumption
54W (Max)
Dimension (W*H*D)
6.6" x 1.0" x 3.7" [168.0mm x 24.5mm x 95.0mm]
Net Weight
0.54lbs [245g]
Address: 830 National Drive #140, Sacramento, CA 95834, USA · Tel: +1(888)499-9906 · Email: support@bzbgear.com 6
BZBGEAR BG-PS21-4K PRODUCT MANUAL
Operation Controls and Functions
Front Panel
1. Power LED: LED will illuminate red when the device is connected to the power
supply.
2. HDMI Input LED: This LED will illuminate green when the HDMI input is selected in
AUTO mode, or will illuminate orange when the HDMI input is selected in MANUAL
mode.
3. USB-C Input LED: This LED will illuminate green when the USB-C input is selected
in AUTO mode, or will illuminate orange when the USB-C input is selected in
MANUAL mode.
4. SELECT AUTO/3s Button: Press this button to select the next input source, or hold
this button for at least 3 seconds to enable auto switching mode. Note that the
factory default switching mode is AUTO.
5. DISPLAY On Button: Press ON to turn on the display.
6. DISPLAY Off Button: Press OFF to turn off the display.
7. Audio Off Button: Press this button to mute/unmute the display audio.
8. Volume Down Button: Press this button to decrease the volume gradually, or hold it
to decrease the volume constantly.
9. Volume Up Button: Press this button to increase the volume gradually, or hold it to
increase the volume constantly.
10. EDID: 4-pin DIP switch for EDID setting.
11. FW: Micro-USB port for firmware upgrade.
Address: 830 National Drive #140, Sacramento, CA 95834, USA · Tel: +1(888)499-9906 · Email: support@bzbgear.com 7
BZBGEAR BG-PS21-4K PRODUCT MANUAL
Rear Panel
12. HDMI IN: HDMI port to connect HDMI input source.
13. USB-C IN: USB Type-C input that provides 40 watts of charging for connected
sources.
14. HDMI OUT: HDMI port to connect to an HDMI output video display.
15. AUDIO OUT: Connect to this 5-pin terminal block to output balanced audio to
external audio devices.
16. RS-232: Connect supported devices to this 3-pin terminal block for RS-232 control.
17. HOST: Connect to this USB 3.0 Type-B port for host connection.
18. DEVICES: These two type-A USB 3.0 ports are to connect peripheral devices such
as a webcam or a speakerphone.
19. DC 24V: Connect the 24V power supply adapter here to power the unit.
Panel Drawing
Address: 830 National Drive #140, Sacramento, CA 95834, USA · Tel: +1(888)499-9906 · Email: support@bzbgear.com 8
BZBGEAR BG-PS21-4K PRODUCT MANUAL
Button Control
Manual-Switching
When the switcher is in manual switching mode, press the SELECT AUTO/3s button
repeatedly to cycle through the two video inputs, and the corresponding source LED
illuminates orange immediately.
Auto-Switching
Press and hold the SELECT AUTO/3s button for at least three seconds to enable automatic
switching. The current input source will not be changed, and its source LED will turn green.
When in the AUTO mode, the switcher will switch according to the following rules:
● Press and hold the SELECT AUTO/3s button for at least three seconds again and
exit AUTO mode, but the input source will not be changed, and the corresponding
source LED will turn orange.
● New input: Upon detecting a new input, the switcher will automatically select the
new input.
● Pressing the SELECT AUTO/3s button also can forcibly change the input source.
● Reboot: Once power is restored to the switcher, it will automatically reconnect the
input before powered off.
● Source removed: When an active source is removed, the switcher will switch to the
other active input.
Display Control
Manual Control: Press the below DISPLAY buttons on the front panel to simultaneously
send RS232 and CEC commands to control the display device.
● ON: Display On.
● OFF: Display Off.
● : Mute/unmute display audio.
● : Volume down display audio.
● : Volume up display audio.
Auto Control: When detecting a video input signal (5V or TMDS), automatically send CEC
and RS232 commands to turn on the display device. When not detecting any video signal
Address: 830 National Drive #140, Sacramento, CA 95834, USA · Tel: +1(888)499-9906 · Email: support@bzbgear.com 9
BZBGEAR BG-PS21-4K PRODUCT MANUAL
within the setting time (default 10mins), automatically send RS232 and CEC commands to
turn off the display device.
The RS232 command can be set by sending commands, please refer to the Third-party
Device Control for more details
EDID Setting
The Extended Display Identification Data (EDID) is used for the source device to match its
video resolution with the connected display. By default, the source device obtains its EDID
from the first connected display. Meanwhile, since the displays with different capabilities are
connected to the switcher, the 4-pin DIP switch on the front panel can be used to set the
EDID to a built-in fixed value. Use the following table to determine the setting for the 4-pin
DIP switch for specific video resolution and audio capabilities.
The switch represents “0” when in the lower (OFF) position, and it represents “1” while
putting the switch in the upper (ON) position.
Switch Status
Video Resolution
Audio Format
0000 (Default)
EDID Pass-through
0001
1280x720@60Hz RGB 4:4:4
Stereo
0010
1920x1080@60Hz
DVI
0011
1920x1080@60Hz 2D
PCM 2.0
0100
1920x1080@60Hz RGB 4:4:4
Stereo
0101
1920x1080@60Hz RGB 4:4:4
High Definition
0110
1920x1200@60Hz RGB 4:4:4
Stereo
0111
3840x2160@60Hz RGB 4:2:0 HDR
Stereo
1000
3840x2160@60Hz RGB 4:2:0 HDR
High Definition
1001
3840x2160@60Hz RGB 4:4:4
Stereo
1010
3840x2160@60Hz RGB 4:4:4
High Definition
Switch Status
EDID
Note
1011
User-defined EDID 1
User-defined EDID
(Please refer to the User-defined EDID)
1100
User-defined EDID 2
1101
User-defined EDID 3
1110
User-defined EDID 4
1111
User-defined EDID 5
Note: The EDID DIP switch is only used for setting the EDID of the HDMI source device.
The USB-C source device will automatically gain the EDID of the display device.
Address: 830 National Drive #140, Sacramento, CA 95834, USA · Tel: +1(888)499-9906 · Email: support@bzbgear.com 10
BZBGEAR BG-PS21-4K PRODUCT MANUAL
RS232 Control
Connect the RS232 port to a control device (e.g. PC) with a RS232 cable. The switcher can
be controlled by sending RS232 commands.
RS232 Command
Communication protocol: RS232 Communication Protocol
Baud rate: 9600
Data bit: 8
Stop bit: 1
Parity bit: none
Note:
● All commands need to be ended with “<CR><LF>”.
● In the commands, “[”and “]” are symbols for easy reading and do not need to be
typed in actual operation.
● Type the command carefully, it is case-sensitive.
Device Control
Command
Description
Command & Feedback Example
#GET_FIRMWARE_VERSION
Get the firmware version.
@V1.0.0
#FACTORY_RESET
Restore to factory defaults.
@FACTORY_RESET
#REBOOT
System reboot.
@REBOOT
#HELP
Get the command details.
Example: #HELP SET_AV
Feedback:
@SELECT VIDEO AND AUDIO INPUT PORT
#SET_AV PARAM1
PARAM1=H,C
H - HDMI
C - TYPE-C
Source Switching
Command
Description
Command & Feedback Example
#SET_AV H
Switch to HDMI input.
@AV H
#SET_AV C
Switch to USB-C input.
@AV C
#GET_AV
Get the current input source.
@AV H
@AV C
#SET_AUTO_SWITCH 1
Enable auto switching mode.
@AUTO_SWITCH 1
#SET_AUTO_SWITCH 0
Disable auto switching mode.
@AUTO_SWITCH 0
Address: 830 National Drive #140, Sacramento, CA 95834, USA · Tel: +1(888)499-9906 · Email: support@bzbgear.com 11
BZBGEAR BG-PS21-4K PRODUCT MANUAL
User-defined EDID
There are five EDID values that can be customized by sending the below command.
Command: #UPLOAD_USER_EDID [PARAM]
Function & Operation:
[PARAM]=1~5, represents the EDID, its DIP switch status shows as below:
[PARAM]
DIP Switch Status
1
1011
2
1100
3
1101
4
1110
5
1111
Operation:
Step 1: Prepare the EDID file (.bin).
Step 2: Set the 4-pin DIP switch status, for example: “1011”.
Step 3: Send the command “#UPLOAD_USER_EDID 1.”, and the feedback is
“@USER_EDID 1 READY PLEASE SEND EDID DATA IN 10S”.
Step 4: Send the EDID file (.bin). If successfully uploaded, the feedback is: “OK”.
Switcher Baud Rate Setting
Command
Description
Command & Feedback Example
#SET_RS232_BAUD 0
Set the RS232 baud rate to 115200.
@RS232_BAUD 0
#SET_RS232_BAUD 1
Set the RS232 baud rate to 57600.
@RS232_BAUD 1
#SET_RS232_BAUD 2
Set the RS232 baud rate to 38400.
@RS232_BAUD 2
#SET_RS232_BAUD 3
Set the RS232 baud rate to 19200.
@RS232_BAUD 3
#SET_RS232_BAUD 4
Set the RS232 baud rate to 9600.
@RS232_BAUD 4
#SET_RS232_BAUD 5
Set the RS232 baud rate to 4800.
@RS232_BAUD 5
#SET_RS232_BAUD 6
Set the RS232 baud rate to 2400.
@RS232_BAUD 6
#GET_RS232_BAUD
Get the RS232 baud rate.
@RS232_BAUD 0
@RS232_BAUD 1
@RS232_BAUD 2
@RS232_BAUD 3
@RS232_BAUD 4
@RS232_BAUD 5
@RS232_BAUD 6
Address: 830 National Drive #140, Sacramento, CA 95834, USA · Tel: +1(888)499-9906 · Email: support@bzbgear.com 12
BZBGEAR BG-PS21-4K PRODUCT MANUAL
CEC/RS232 Function Setting
The ending mark of command is “<CR><LF>”.
Command
Function
Command & Feedback Example
#SET_SYNCACT_CEC 1
Enable the function of automatically sending CEC
commands.
When detecting a video input signal or not detecting
any video signal, the switcher will automatically send
the corresponding CEC command to control the
display device.
@SYNCACT_CEC 1
#SET_SYNCACT_CEC 0
Disable the function of automatically sending CEC
commands.
@SYNCACT_CEC 0
#GET_SYNCACT_CEC
Get the function setting status of automatically sending
CEC commands.
@SYNCACT_CEC 1
#SET_SYNCACT_RS232
1
Enable the function of automatically sending RS232
commands.
When detecting a video input signal or not detecting
any video signal, the switcher will automatically send
the corresponding RS232 command to control the
display device.
@SYNCACT_RS232 1
#SET_SYNCACT_RS232
0
Disable the function of automatically sending RS232
commands.
@SYNCACT_RS232 0
#GET_SYNCACT_RS232
Get the function setting status of automatically sending
RS232 commands.
@SYNCACT_RS232 1
#SET_DTIME
[PARAM1]: [PARAM2]
When not detecting video input signal, set the auto
power-off time of display device to
[PARAM1]: [PARAM2]. The default time is 10 minutes.
[PARAM1]=0~30 minutes.
[PARAM2]=0~1800 seconds.
#SET_DTIME 1:30
@DTIME 1:30
#GET_DTIME
Get the auto power-off time of display device
@DTIME 30:0
Display Control
Command
Description
Command & Feedback Example
#SET_AUDIO_MUTE
Mute/unmute the display audio through CEC and
RS232 channels.
@AUDIO_MUTE_UNMUTE
#SET_VOL +
Increase the display audio through CEC and RS232
channels.
@VOL -
#SET_VOL -
Decrease the display audio through CEC and RS232
channels.
@VOL +
#SET_DISPLAY 1
Power on display device (Simultaneously sending
CEC and RS232 commands to display device).
@DISPLAY 0
#SET_DISPLAY 0
Power off display device (Simultaneously sending
CEC and RS232 commands to display device).
@DISPLAY 1
Address: 830 National Drive #140, Sacramento, CA 95834, USA · Tel: +1(888)499-9906 · Email: support@bzbgear.com 13
BZBGEAR BG-PS21-4K PRODUCT MANUAL
Third-party Device Control
Connect a third-party device (e.g. projector) to the RS232 port of switcher, the third-party
device can be controlled simultaneously by the below RS232 commands while press the
front panel button (ON, OFF, MUTE, VOLUME + or VOLUME -).
Note: The below commands don’t need ending mark
Command
Description
Command & Feedback Example
#SET_ON_[PARAM1]_
[PARAM2]:XXXX
Set the ASCII RS232 command XXXX to be sent to
control the third-party device when the DISPLAY ON
button is pressed.
● [PARAM1] = 00~06 (Baud Rate)
00 - 115200
01 - 57600
02 - 38400
03 - 19200
04 - 9600
05 - 4800
06 - 2400
● [PARAM2] = 00~99. The delay time of sending
command.
XXXX: Any ASCII code (up to 48 bytes).
#SET_ON_05_30:1234567
@BAUDRATE: 4800
@DELAY TIME: 30 s
@DISPLAY ON TO
SEND:1234567
#SET_H_ON_[PARAM1]_
[PARAM2]:XX XX
Set the HEX RS232 command XX XX to be sent to
control the third-party device when the DISPLAY ON
button is pressed.
● [PARAM1] = 00~06 (Baud Rate)
00 - 115200
01 - 57600
02 - 38400
03 - 19200
04 - 9600
05 - 4800
06 - 2400
● [PARAM2] = 00~99. The delay time of sending
command.
XXXX: Any HEX code (0-9, A-F; up to 20 bytes. It
must have a blank between 2 different XX).
#SET_H_ON_05_30:31 32
33 34 35
@BAUDRATE: 4800
@DELAY TIME: 30 s
@DISPLAY ON HEX TO
SEND:31 32 33 34 35
#SET_OF_[PARAM1]_
[PARAM2]:XXXX
Set the ASCII RS232 command XXXX to be sent to
control the third-party device when the DISPLAY OFF
button is pressed.
● [PARAM1] = 00~06 (Baud Rate)
00 - 115200
01 - 57600
02 - 38400
03 - 19200
04 - 9600
05 - 4800
06 - 2400
● [PARAM2] = 00~99. The delay time of sending
command.
XXXX: Any ASCII code (up to 48 bytes).
#SET_OF_05_30:ABCDEFG
@BAUDRATE: 4800
@DELAY TIME: 30 s
@DISPLAY OFF TO
SEND:ABCDEFG
#SET_H_OF_[PARAM1]_
[PARAM2]:XX XX
Set the HEX RS232 command XX XX to be sent to
control the third-party device when the DISPLAY OFF
button is pressed.
● [PARAM1] = 00~06 (Baud Rate)
00 - 115200
01 - 57600
02 - 38400
#SET_H_OF_05_30:41 42
43 44 45
@BAUDRATE: 4800
@DELAY TIME: 30 s
@DISPLAY OFF HEX TO
SEND:41 42 43 44 45
Address: 830 National Drive #140, Sacramento, CA 95834, USA · Tel: +1(888)499-9906 · Email: support@bzbgear.com 14
BZBGEAR BG-PS21-4K PRODUCT MANUAL
Command
Description
Command & Feedback Example
03 - 19200
04 - 9600
05 - 4800
06 - 2400
● [PARAM2] = 00~99. The delay time of sending
command.
XXXX: Any HEX code (0-9, A-F; up to 20 bytes. It
must have a blank between 2 different XX).
#SET_AM_[PARAM1]_
[PARAM2]:XXXX
Set the ASCII RS232 command XXXX to be sent to
control the third-party device when the VOLUME
MUTE button is pressed.
● [PARAM1] = 00~06 (Baud Rate)
00 - 115200
01 - 57600
02 - 38400
03 - 19200
04 - 9600
05 - 4800
06 - 2400
● [PARAM2] = 00~99. The delay time of sending
command.
XXXX: Any ASCII code (up to 48 bytes).
#SET_AM_05_30:ABCDEFG
@BAUDRATE: 4800
@DELAY TIME: 30 s
@VOLUME MUTE TO
SEND:ABCDEFG
#SET_AU_[PARAM1]_
[PARAM2]:XXXX
Set the ASCII RS232 command XXXX to be sent to
control the third-party device when the VOLUME UP
button is pressed.
● [PARAM1] = 00~06 (Baud Rate)
00 - 115200
01 - 57600
02 - 38400
03 - 19200
04 - 9600
05 - 4800
06 - 2400
● [PARAM2] = 00~99. The delay time of sending
command.
XXXX: Any ASCII code (up to 48 bytes).
#SET_AU_05_30:ABCDEFG
@BAUDRATE: 4800
@DELAY TIME: 30 s
@VOLUME + TO
SEND:ABCDEFG
#SET_H_AU_[PARAM1]_
[PARAM2]:XX XX
Set the HEX RS232 command XX XX to be sent to
control the third-party device when the VOLUME UP
button is pressed.
● [PARAM1] = 00~06 (Baud Rate)
00 - 115200
01 - 57600
02 - 38400
03 - 19200
04 - 9600
05 - 4800
06 - 2400
● [PARAM2] = 00~99. The delay time of sending
command.
XXXX: Any HEX code (0-9, A-F; up to 20 bytes. It
must have a blank between 2 different XX).
#SET_H_AU_05_30:31 32
33 34 35
@BAUDRATE: 4800
@DELAY TIME: 30 s
@VOLUME + HEX TO
SEND:41 42 43 44 45
#SET_AD_[PARAM1]_
[PARAM2]:XXXX
Set the ASCII RS232 command XXXX to be sent to
control the third-party device when the VOLUME
DOWN button is pressed.
● [PARAM1] = 00~06 (Baud Rate)
00 - 115200
01 - 57600
02 - 38400
03 - 19200
04 - 9600
05 - 4800
06 - 2400
● [PARAM2] = 00~99. The delay time of sending
command.
XXXX: Any ASCII code (up to 48 bytes).
#SET_AD_05_30:ABCDEFG
@BAUDRATE: 4800
@DELAY TIME: 30 s
@VOLUME - TO
SEND:ABCDEFG
Address: 830 National Drive #140, Sacramento, CA 95834, USA · Tel: +1(888)499-9906 · Email: support@bzbgear.com 15
BZBGEAR BG-PS21-4K PRODUCT MANUAL
Command
Description
Command & Feedback Example
#SET_H_AD_[PARAM1]_
[PARAM2]:XX XX
Set the HEX RS232 command XX XX to be sent to
control the third-party device when the VOLUME
DOWN button is pressed.
● [PARAM1] = 00~06 (Baud Rate)
07 - 115200
08 - 57600
09 - 38400
10 - 19200
11 - 9600
12 - 4800
13 - 2400
● [PARAM2] = 00~99. The delay time of sending
command.
XXXX: Any HEX code (0-9, A-F; up to 20 bytes. It
must have a blank between 2 different XX).
#SET_H_AD_05_30:41 42
43 44 45
@BAUDRATE: 4800
@DELAY TIME: 30 s
@VOLUME - HEX TO
SEND:41 42 43 44 45
Troubleshooting & Maintenance
Problems
Potential Causes
Solutions
Output image with snowflake
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.
POWER indicator doesn’t work or
no respond to any operation
Fail connection of power cord.
Make sure the power cord connection is
good.
Static becomes stronger when
connecting the video connectors
Bad grounding.
Check the grounding and make sure it is
connected well.
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.
Address: 830 National Drive #140, Sacramento, CA 95834, USA · Tel: +1(888)499-9906 · Email: support@bzbgear.com 16
BZBGEAR BG-PS21-4K PRODUCT MANUAL
Application Example
Address: 830 National Drive #140, Sacramento, CA 95834, USA · Tel: +1(888)499-9906 · Email: support@bzbgear.com 17
BZBGEAR BG-PS21-4K PRODUCT MANUAL
Tech Support
Have technical questions? We may have answered them already!
Please visit BZBGEAR’s support page (bzbgear.com/support) for helpful information and
tips regarding our products. Here you will find our Knowledge Base
(bzbgear.com/knowledge-base) with detailed tutorials, quick start guides, and step-by-step
troubleshooting instructions. Or explore our YouTube channel, BZB TV
(youtube.com/c/BZBTVchannel), for help setting up, configuring, and other helpful how-to
videos about our gear.
Need more in-depth support? Connect with one of our technical specialists directly:
Phone
1.888.499.9906
Email
support@bzbgear.com
Live Chat
bzbgear.com
Limited Product Warranty Terms
Pro Line: 5-year warranty from the date of purchase for AV/Broadcasting products bought
on or after August 1, 2024.
Essential Line: 3-year warranty from the date of purchase for AV/Broadcasting products
bought on or after August 1, 2024.
Cables: Lifetime Limited Product Warranty.
For complete warranty information, please visit bzbgear.com/warranty.
For questions, please call 1.888.499.9906 or email support@bzbgear.com.
Mission Statement
BZBGEAR is a breakthrough manufacturer of high-quality, innovative audiovisual equipment
ranging from AVoIP, professional broadcasting, conferencing, home theater, to live
streaming solutions. We pride ourselves on unparalleled customer support and services.
Our team offers system design consultation, and highly reviewed technical support for all
the products in our catalog. BZBGEAR delivers quality products designed with users in
mind.
Copyright
All the contents in this manual and its copyright are owned by BZBGEAR. No one is allowed
to imitate, copy, or translate this manual without BZBGEAR’s permission. This manual
contains no guarantee, standpoint expression or other implies in any form. Product
specification and information in this manual is for reference only and subject to change
without notice.
All rights reserved. No reproducing is allowed without acknowledgement.
Address: 830 National Drive #140, Sacramento, CA 95834, USA · Tel: +1(888)499-9906 · Email: support@bzbgear.com 18
