Key Digital Pro Series User manual

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Rev 1.0 –Sep, 2023
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KD
-
Pro4x1X
-
2
4 Input 4K 18Gbps Pro Series HDMI Switcher with Web UI,
Auto-Switching, Analog and Digital Audio De-Embedding

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Table of Contents
About KD-Pro4x1X-2 3
Quick Setup Guide 4
Connect 4
Configure 4
Control 6
Application Example 10
Connections, Buttons, and LEDs 11
Programming-Free System Wiring 15
TCP/IP and RS-232 Commands 16
IP to RS-232 Command Forwarding 19
Specifications 20
Warranty Information 20
Product Warnings & Safety Instructions 20
Operation Manual
Please visit www.keydigital.com for the latest product documentation,
firmware, control drivers and software downloads. Product features and
specifications are subject to change without notice
Always follow the instructions provided in this Operating Manual.

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About KD-Pro4X1X-2
Key Digital® KD-Pro4x1X-2 is a 4K/18G HDMI switcher with analog and digital audio de-embedding, auto
switching, web UI and iOS app-ready control. Designed for professional audio video installations in conference
rooms, huddle spaces, classrooms, theater and gaming spaces, KD-Pro4x1X-2 enables multiple video sources
to connect to a single video display while analog (3.5mm & balanced/unbalanced) and digital (optical & PCM)
audio de-embed ports may feed audio of the selected source into and amplifier, DSP, or sound bar. KD-
Pro4x1X-2 supports all SD, HD, VESA and Ultra HD/4K video standards with HDR header information included
in a variety of 4K EDID handshakes. In addition to IR, RS-232, and TCP/IP control, KD-Pro4x1X-2 can also be
controlled via trigger voltage and boasts a programming-free presentation system capability when integrated
with KD-Amp220 and/or KD-CamUSB and controlled via Web UI or free Key Digital iOS app.
Key Features
•HDMI Switching: 4 HDMI sources to 1 HDMI output/display
•Ultra HD/4K: Supports up to 4096x2160 or 3840x2160 24/25/30/60hz at 4:4:4 (signals up to 18Gbps
bandwidth)
•Audio De-embedding®: Audio of the selected HDMI input is de-embedded at the analog (3.5mm
stereo & L/R balanced/unbalanced) and digital (optical & PCM) connectors
•Key Digital® App Ready: Scan & detect population for pre-built GUI and TCP/IP control via Key
Digital® App
•Auto-Switching: Automatic selection of newly detected source and switching from newly disconnected
source via hot plug detection voltage when enabled
•Surround Audio Support: DTS-HD Master Audio™, DTS:X®, Dolby® TrueHD, Dolby Atmos®
•Programming-Free Presentation System: Add KD-Amp220 and/or KD-CamUSB as desired and setup
in KDMS Pro for a complete user interface in the web UI and KD iOS App including AV switching,
volume control with microphone mix, and PTZ web cam control for an all-in-one user-friendly system.
•Control: Front panel button, serial IR, optical IR, RS-232, trigger in, and TCP/IP controllable with web UI
and KD-App ready
Additional Features
•Key Digital® App & KDMS® Pro Ready: Scan & detect population for pre-built GUI and TCP/IP control
via Key Digital® App and Key Digital Management Software™Pro (KDMS™Pro) PC setup Software
•IP to RS-232 Command forwarding: Commands received on the TCP/IP port may be output on the
RS-232 port for controlling Key Digital KD-Amp220, KD-CamUSB, or third-party RS-232 controllable
devices with ASCII format commands.
•HDCP Licensing: Fully licensed and compatible with HDCP 2.2
•HDR10 and Dolby Vision: More life-like images through a greater range of luminance levels
•Resolution Support: Supports all SD, HD, and VESA (VGA, SVGA, XGA, WXGA, SXGA, UXGA) up to
4096x2160p
•Deep Color Support: Up to UHD/4K 30Hz 4:4:4/12 bits or 60Hz 4:4:4/8 bit

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•Full Buffer System™:Manages TMDS re-clocking / signal re-generation, HDCP authentication to
source & display, and EDID Control handshake
•EDID Management: Internal library with 15 internal EDID handshakes including 4K with HDR in addition
to native EDID data copied from the output/display 1
•TMDS re-clocking: Support for long HDMI connectivity using Key Digital® HDMI cables
Accessories
•Power supply, 5V/2.4A, 12W, desktop type,
model KD-PS12W5VC
•(2) Rack Ears, 1x long, 1x short for
mounting in full-width rack
•IR Remote Control, model KD-
RMSWPROK
•(2) 6-pin terminal block
•USB Setup Cable, USB Micro to USB A
Quick Setup Guide
Begin with the KD-Pro4X1X-2, all source, display devices, audio system, and any other connected
peripherals powered off.
Connect
1. Connect HDMI sources to the input ports.
2. Connect HDMI displays to the output ports.
3. Connect analog and/or digital audio outputs to amplifiers/receivers.
4. Connect Control System. For KD-App control and/or IP control from a control system or PC, connect.
TCP/IP port to network. RS-232 and IR control may also be utilized.
5. Connect Power Supply. Screw-in the power supply to KD-Pro4x1X-2, then plug-in to power outlet.
6. Connect from your PC using the USB micro port on the face of the unit to begin configuration steps.
7. (Optional) If integrating in a Programming-Free Presentation System with KD-Amp220 and/or KD-
CamUSB, refer to the Programming-Free Presentation System Wiring section.
Configure
EDID
Use the EDID rotary dial to choose the desired handshake (video resolution and audio
format information) that will be provided to the connected source.
Configure KD-PRO4X1X-2 with Key Digital Management Software Pro (KDMS Pro). Download HERE
1. Open the Key Digital® Management Software™Pro software and perform a USB scan (fig. 1)

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2. Choose the detected device from the Devices window (fig. 2a)
3. In the Network Settings section of the Properties window, enter the desired IP settings (fig. 2b)
oIP Address (default is 192.168.1.239)
oSubnet Mask (default is 255.255.255.0)
oGateway (default is 192.168.1.1)
oPort (default is 23)
▪Note: If using KD-App, please do not change the port number.
4. Enter the desired name for the KD-Pro4x1X-2. Ie “HDMI Switch” or “Conference Room”
5. Save (fig. 2d).
6. If using the Key Digital iOS app (AKA KD-App), Web UI, or other 2-way control systems, set the desired
Input/Output names by entering the Input/Output Settings section of the properties window, and
selecting the Change Input/Output Name button (fig. 3a), selecting the desired input / output and
entering the name (fig. 3b).
7. If utilizing Programming-Free Presentation System, choose the quantity of KD-CamUSB cameras
needed to control (fig 4a) and apply (fig 4b), then choose the KD-AMP220 Control selection box (fig. 5a)
in the Audio/Video properties section. To control the mix level of KD-AMP220’s microphone input,
choose the selection box for Microphone Control (fig. 5b)
oNote: Controlling more than two cameras will require the use of active third-party RS-232 signal
distribution. Maximum of seven cameras is supported.

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Control
Option 1: Control via Remote Control

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Option 2: Control via KD-App, KDMS Pro™
KD-Pro4x1X-2 is controllable by Key Digital’s user-friendly iOS App (downloadable
in the App Store) or Key Digital® Management Software™Pro (downloadable here).
1. Connect and Configure your KD-Pro4x1X-2 as described in the Connect &
Configure sections
2. Download and open KD-App and/or KDMS™
3. Ensure the iOS device and/or PC computer are on the same network with
KD-Pro4x1X-2
4. Perform a network scan in the KD-App/KDMS™and select the unit.
5. Select and control the selected KD-Pro4x1X-2.
6. Enter the Video Switching, Camera Control, and/or Audio Control tabs to control the respective features
of the system. The Camera and Audio tabs are only visible if those control settings have been applied.
7. (Optional) To enter end-user mode in KDMS Pro, type CTRL + ALT + N after selecting the unit in the
devices tree. This provides a view without any configuration settings visible.
Option 3: Control via web UI
Access KD-Pro4x1X-2’s web UI from any phone,
tablet, or PC. The web UI shows the input, output,
and unit name for a user-friendly experience and
the Web UI may also be used to integrate and
control KD-CAMUSB PTZ webcam and KD-
AMP220 amplifier via RS-232 to create a complete
system with HDMI switching, volume control,
microphone level mix, camera PTZ and preset
control.
1. Connect and Configure your KD-Pro4x1X-2
as described in the Connect & Configure
sections
2. Ensure the PC, phone, or tablet are on the
network with KD-Pro4x1X-2
3. Enter IP Address of KD-Pro4x1X-2 unit into the web browser search bar. The default IP address is
192.168.1.239.
4. Enter password. Default password is “admin”
5. Use the web UI to control switching
6. Press the Settings gear icon button to access naming, control and network settings.

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7. Enter the Video Switching, Camera Control, and/or Audio Control tabs to control the respective features
of the system.
NOTE: See the Programming-Free Presentation System Wiring section for RS-232 wiring instructions for
optional Camera and Amplifier control wiring.

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Option 4: Control via professional control system
KD-Pro4x1X-2 allows control over serial interface for bi-directional communication.
•For RS-232 control use pins 4, 5, and 6
of the Unit Control port. Baud Rate is
57,600
•For TCP/IP control the default static IP
address is 192.168.1.239, with port 23.
•KD-Pro4x1X-2 supports KD’s standard matrixing protocol, so if you have controlled a KD switcher with a
third-party control system before, you will likely have success with the same driver/module.
Switching HDMI AV + External Audio together
i. SPOxxSIyy xx = output (01), yy = input (01-04)
ii. SPOSIyy xx = output (01-04), yy = input (01-04)
•A carriage return is required at the end of each string. See the TCP/IP and RS-232 Commands
section for full command set and protocol.
Test for proper operation of the unit and cables in your system before permanently securing the
unit for final installation. Ensure that you leave enough ventilation space to provide sufficient
airflow and cooling

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Application Example
Conference Room AV switching system with Key Digital amplifier and PTZ web cam integrated and controlled
via web UI without any programming required.

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Connections, Buttons, and LEDs
REAR CONNECTIONS and ROTARY
HDMI Inputs (4)
•The 4 HDMI inputs are located on the left side of the back panel.
•Blue LED illuminates solid to indicate an active HDMI signal is incoming.
HDMI Output
•1 HDMI located on the right-center of the back panel.
•Blue LED illuminates solid when Hot Plug Detection (HPD) is received from the connected display /
output device.
HDMI Input & Outputs Port Specifications
•Supports up to UHD/4K @ 50/60 fps [4:4:4], 18Gbps signals
oSee Supported standard 4K Video Formats table
•Supports HDR10
•Compliant with HDCP 2.2 and previous
•Supports lossless compressed audio formats including Dolby® TrueHD, Dolby® Digital Plus, Dolby
Atmos®, and DTS-HD Master Audio™, DTS:X®, Dolby® TrueHD, Dolby Atmos®
•Does not support CEC
•CEC pass-through from display to selected HDMI source
•For Display Port sources/monitors,
use active converters
Supported standard 4K Video Formats

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EDID Handshaking Rotary
•EDID authentication is provided
from the unit to the selected
input/source.
•The EDID file (AKA
“handshake” is selected using
the EDID rotary on the unit and
provides a list of compatible
video and audio formats as well
as digital data, informing the
source device what it should
output.
•Most sources will comply with a
new EDID file without a power-
cycle, but devices do behave
differently.
•Adjustments may speed up
sync time during source
selection.
Balanced / Un-balanced Analog Audio Output:
•6-pin phoenix connector
•Provides 2ch balanced or un-balanced analog audio output from the selected HDMI input source
•The Pin assignment for the audio is as follows:
oLeft + is Pin 1; Left - is Pin 3; Left Ground is Pin 2.
oRight + is Pin 4; Right - is Pin 6; Right Ground is Pin 5.
•For un-balanced audio, use the + and Ground pins of each channel
•Drives audio signals up to 2VRMS with a sampling rate of 192KHz
L/R Analog Audio Output:
•3.5mm stereo jack with de-embedded audio from the selected HDMI source
•Drives audio signals up to 1 VRMS with a sampling rate of 192KHz
•Automatically mutes if incoming audio format is not PCM 2ch
Optical Digital Audio Output
•Provides digital audio output from the selected HDMI input source.
•Supports PCM, SPDIF (IEC 60958), Dolby Digital®, and DTS™up to 5.1 / 6.1
•Compatible with sampling rates up to 96KHz

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PCM Digital Audio Output
•Provides digital audio output from the selected HDMI input source.
•Supports PCM, SPDIF (IEC 60958), Dolby Digital®, and DTS™up to 5.1 / 6.1
•Compatible with sampling rates up to 96KHz
Note for All Audio De-Embed Ports
•There are no volume or tone control features
•There are no format conversion features. For example, to achieve 2ch analog audio output, the selected
HDMI input source audio format must be 2ch.
TCP/IP Unit Control: Used for unit control from a control system and/or PC
•Default static IP address is 192.168.1.239, port 23
•Connect ethernet cable from the KD-Pro4x1X-2 to a network router or connect a straight through cable
directly from a PC
•Unit configuration, control, and firmware updates are achieved with Key Digital Management Software™
Pro (KDMS™Pro) downloaded HERE.
•See TCP/IP and RS-232 Commands section for full API
Main Control Port: Used for unit control from a control system and/or PC
•6-Pin Terminal Block for Trigger In, IR and RS-232
•Pin out:
oPin 1 = Trigger In
oPin 2 = IR In
oPin 3 = IR/Trigger Ground
oPin 4 = RS-232 Tx Data
oPin 5 = RS-232 Ground
oPin 6 = RS-232 Rx Data
•See TCP/IP RS-232 Commands section for full API

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FRONT CONNECTIONS, BUTTONS, SWITCHES
Service USB (1):
•Micro USB port
•Used for configuration and control from
PC via KDMS Pro, or third-party control
terminals
•Used for firmware updates (consult
with Key Digital tech support before
updating firmware).
oNote: After updating firmware,
all unit settings are restored to
defaults except IP information.
Please collect all customized
settings info before loading
firmware.
•Supports USB driver for Windows, Mac
•Will register as “Prolific USB-to-Serial
Comm Port in Device Manager
•Can be used as RS-232 control port.
Baud rate is 115,200.
Forced HPD Troubleshooting Tool:
•When ON, Hot Plug Detection voltage is fixed to the high state to the connected display.
•Standard HPD behavior when set to OFF position.
Input Select Button:
•Used to choose which connected source is output to the connected display/device
•Selecting a source with the Input Select button or IR remote will disable Auto Sensing Mode IF Auto
sensing has not been set via the front switch.
•To factory reset the unit, press and hold for approx. 10 seconds until the front LEDs blink twice
Output Active LED:
•Blue LED illuminates solid when Hot Plug Detection (HPD) is received from the connected
display/output device.
Auto Sensing
•ON: Unit will automatically select a newly detected active source. If current source is disconnected or
becomes inactive, auto sensing will sequentially advance to an active input/source
•OFF: Unit is in normal mode and regular switching functionality will occur
•Manual source selection via push-button, IR, or RS-232 is still possible when enabled.
•Auto Switching mode is only disabled via IR or RS-232. It is not disabled via manual source
switching/selection.

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IR Sensor: Mount IR an IR emitter from control system or IR connection block. Refer to IR Remote Control
section for correct button press sequence
Programming-Free Presentation System Wiring
KD-Pro4x1X-2 can forward commands received on the TCP/IP port to the RS-232 port to control Key Digital’s
KD-CamUSB PTZ web cam and KD-Amp220 pre-amp / amplifier to build a complete integration system for
presentation and meeting spaces without any programming. After enabling Camera and/or Amplifier control in
the web UI or KDMS Pro, follow the below RS-232 wiring instructions.
1. Control originates on the TCP/IP network port from Web UI
2. IP is forwarded to RS-232 and output at the Unit Control TxD and Ground pins
3. For KD-Amp220 control, connect unit Control Port TxD and Ground into KD-AMP220 RS-232 port RxD
and Ground
4. For KD-CAMUSB control, connect unit Control Port TxD and Ground into KD-CAMUSB RS-232 port
RxD and Ground
NOTES:
•It is OK to insert 2 wires into KD-Pro4x1X-2’s RS-232 pins to achieve control of the Camera and the
Amplifier.
•Ensure that the TxD wire(s) do not contact the Ground wire(s)

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TCP/IP and RS-232 Commands
TCP/IP Connection Protocol
•Default IP address = 192.168.1.239
•TCP/IP Port Number = 23
•Notes: Use Raw / Other service, not Telnet.
Maximum of two TCP/IP socket supported at a time.
Simultaneous TCP/IP and web sockets are supported. Multiple web sockets are supported.
RS-232 Connection Protocol
•Baud Rate = 57,600 bits per second as default
•Data Bits = 8
•Stop Bits = 1
•Parity = None
•Flow Control = None
Notes:
•Carriage Return is required at end of each string
•Commands are not case-sensitive
•Spaces are shown for clarity; commands should NOT have any spaces
•After a new command is received, a prompt should be sent back
•HDMI Input selections via front button, IR remote, serial IR In, USB service port, trigger in, or RS-232 all
respond with the following message via TCP/IP:
o[INPUT=x]
ox = the currently selected input (1-4)
oThe response terminates with a carriage return followed by a line feed
Help Command (H). Returns entire API in readable format:
-------------------------------------------------------------------------
-- Key Digital Systems HELP --
-------------------------------------------------------------------------
-- KD-Pro4x1X-2 F/W Version : 1.00 --
-- --
-- H : Help --
-- PF : Power Off --

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-- PN : Power ON --
-- STA : Show Global System Status --
-- --
-- Video Output Setup Commands: yy = [01-02,U,D] --
-- SPO SI yy : Set Output to Video Input yy --
-- SPO01 SI yy : Set Output to Video Input yy --
-- SPO ON/OFF : Set Output ON/OFF --
-- SPO DBG ON/OFF : Set Output Debug Mode ON/OFF --
-- --
-- Audio Output Setup Commands: [E=Enable, D=Disable] --
-- SPO AA E/D : Enable/Disable External Analog Audio Output --
-- SPO DA E/D : Enable/Disable External Optical Audio Output --
-- SPO CAM ON/OFF : Set CAMUSB Control Mode ON/OFF --
-- SPO AMP ON/OFF : Set AMP220 Control Mode ON/OFF --
-- SPO MIC ON/OFF : Set AMP220 MIC Mode ON/OFF --
-- --
-- Input/Output/Device Naming Commands (Max. 16 Chars) --
-- SPI xx WN cccccccccccccccc : Write Input xx Name --
-- SPI xx RN : Read Input xx Name --
-- SPO xx WN cccccccccccccccc : Write Output xx Name --
-- SPO xx RN : Read Output xx Name --
-- SPC WN cccccccccccccccc : Write Device Name --
-- SPC RN : Read Device Name --
-- --
-- Network Setup, ( xxx=[000-255], zzzz=[0001~9999] ) --
-- SPCETIPA xxx.xxx.xxx.xxx : Set Host IP Address to xxx.xxx.xxx.xxx --
-- SPCETIPM xxx.xxx.xxx.xxx : Set Net Mask to xxx.xxx.xxx.xxx --
-- SPCETIPR xxx.xxx.xxx.xxx : Set Route IP Address to xxx.xxx.xxx.xxx --
-- SPCETIPP zzzz : Set TCP/IP Port to zzzz --
-- SPCETIPB : Apply New Network Config --

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-- --
-- System Control Setup Commands: --
-- SPC AS x : Set Auto Sensing Mode x = [0:OFF, 1=ON] --
-- SPC FB E/D : Enable/Disable Front Panel Buttons --
-- SPC RSB z : Set RS232 Baud Rate to z bps, z=[0-4] --
-- [0:57600, 1:38400, 2:19200, 3:9600, 4:4800] --
-- SPC DF : Reset to Factory Defaults --
-- SPC DF00 : Reset to Factory Defaults without Network Reset --
-- FWD(xxxxxxxxxx): Forward ASCII string xxxxxxxxxx received on IP port to RS-232 port --
-- Reset to Factory Defaults without Network Reset --
-------------------------------------------------------------------------
Status Command (STA). Returns unit status and settings in readable format:
-------------------------------------------------------------------------
-- Key Digital Systems STATUS --
-------------------------------------------------------------------------
-- KD-Pro4x1X-2, Device Name: PRO4x1X-2_0001 --
-- F/W Version : 1.00 --
-- Power : ON --
-- Front Panel Button : Enabled --
-- Auto Sensing Mode : OFF --
-- RS232 : Baud Rate=57600bps, Data=8bit, Parity=None, Stop=1bit --
-- --
-- Network Setting(Telnet Server) Status --
-- MAC Address = 60:89:B1:23:20:01 --
-- Host IP Address = 192.168.001.239 --
-- Net Mask = 255.255.255.000 --
-- Router IP Address = 192.168.000.001 --
-- TCP Port = 0023 --
-- --
-- Video Input 01 : EDID = DEFAULT A, LINK = ON --
-- Video Input 02 : EDID = DEFAULT A, LINK = ON --
-- Video Input 03 : EDID = DEFAULT A, LINK = ON --
-- Video Input 04 : EDID = DEFAULT A, LINK = ON --
-- --
-- Video Output : Input = 01, Output = ON, LINK = ON , DBG = OFF --
-- --
-- Audio Output : Analog = Enabled, Optical = Enabled --
-- --
-- Control : CAMUSB Mode = OFF, AMP220 Mode = OFF, MIC Mode = OFF --
-------------------------------------------------------------------------

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IP to RS-232 Command Forwarding
KD-Pro4x1X-2 can forward ASII strings received on the TCP/IP port to the RS-232 port for one-directional
control of RS-232 device(s) without using ports from a master controller.
This feature is how KD-Pro4x1X-2’s Programming-Free Presentation System is achieved and may also be
utilized in other systems.
Send the command FWD(xxxxxxxxxxxxxxxx)to KD-Pro4x1X-2 via IP connection and the characters within the
parenthesis will be output on the RS-232 port, with xxxxxxxxxxxxxxxx being a maximum of 16 supported ASCII
characters.
Like all TCP/IP commands sent to KD-Pro4x1X-2, a carriage return is required at the end of the command.
Use KDMS Pro or PuTTy terminal to set KD-Pro4x1X-2’s baud rate to match the RS-232 controlled device.
Examples:
1. The TCP client device sends FWD(_SPI01AVU\r)\r
a. _SPI01AVU\r string comes out via the RS-232 port
2. The TCP client device sends FWD(hello123@#)\r
a. hello123@# string comes out via the RS-232 port
3. The TCP client device sends
FWD(KD1CAMRP5_)\r
a. KD1CAMRP5_ message
comes out via the RS-232 port.
Supported ASCII Characters
The characters within the blue rectangles are
supported

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Specifications
Technical
•Input (Each): 1 HDMI Connector, Type A, 19 Pin Female
•Output (Each): 1 HDMI Connector, Type A, 19 Pin Female
•Output (Each): Balanced/unbalanced line level audio on 6-pin terminal block. Drives 2VRMS line audio
input with a sampling rate of 192KHz
•Output (each): TOSlink optical digital audio following SPDIF format (IEC 60958). Supports sampling rate
up to 192KHz
•Video Bandwidth: TMDS bandwidth 18 Gbps
•DDC Signal (Data): Input DDC Signal - 5 Volts p-p (TTL)
•HDMI Video/Audio Signal: Input Video Signal - 1.2 Volts p-p
•DDC Communication: EDID and HDCP Bi-directional buffering to Display and Source
•Analog Audio Max Output Level: 4dBu on 150kΩ, DC coupling
•Audio Bandwidth: 20Hz to 20kHz @ 0dBu
•TND + Noise: 0.33% @0dBu @ 1kHz
•Optical Max Output Level: 1Vpp on 75Ω, DC coupling
•Wired IR: modulated IR signal input, 0-5V TTL or -10 to +10V
•Power: 12V/1.66A (20W) AC Power Supply with Grounded, 2.1mm ID DC Power Jack with Screw In
Type
General
•Regulation: CE, RoHS, WEEE, EAC
•Product Dimensions (LxWxH): 17.24 x 7.48
x 1.73” (438 x 190 x 44mm)
•Product Weight: Weight: 5.62 lbs / 2.55 kg
•Packaging Dimensions (LxWxH): 19.48 x
12.20 x 3.14” (495 x 310 x 80mm)
•Packaging Weight: 7.94 lbs / 3.62 kg
Warranty Information
All Key Digital® products are built to high manufacturing standards and should provide years of trouble-free
operation. They are backed by a Key Digital Limited 3 Year Product Warranty Policy.
http://www.keydigital.com/warranty.htm
Product Warnings & Safety Instructions
Important Product Warnings:
1. Connect all cables before providing power to the unit.
2. Test for proper operation before securing unit behind walls or in hard to access spaces.