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Introduction
Key Digital® KD-S2x1X-2/KD-S4x1X-2 are 4K/18G HDMI switchers engineered to offer the best in
quality, performance, and reliability, while providing a cost-effective HDMI switching solution. Designed for
professional audio video installations in presentation, theater, and gaming spaces, KD-S2x1X-2/KDS4x1X-2
enables multiple video sources to connect to a single video display while L/R analog and Optical audio
de-embed ports may be used to feed audio of the selected source into amplifiers, DSPs, or sound bars.
Enable auto-switching to automatically select newly connected/powered sources or sequentially advance
from the currently selected source when it is disconnected/powered off. KD-S2x1X-2/KD-S4x1X-2 HDMI
switchers support all SD, HD, VESA and Ultra HD/4K video standards with HDR header information included
in a variety of 4K EDID handshakes. The switchers feature push button and optical IR switching, status-
monitoring LEDs, and support of HDR10, HDCP 2.2 and 4K.
Key Features
› HDMI Switching: 2/4 HDMI sources to 1 HDMI output/display
› Ultra HD/4K Support: 4096x2160 or 3840x2160 24/25/30/60hz at 4:4:4 (signals up to 18Gbps)
› HDCP Licensing: Fully licensed and compatible with HDCP 2.2
› HDR10 (High Dynamic Range): 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
› Audio De-embedding: Audio of the selected HDMI input is output at the digital Optical and analog
3.5mm stereo connectors
› Auto-Switching: Automatic selection of newly detected source and switching from newly
disconnected source via hot plug detection voltage when enabled
› 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
› Lossless Compressed Digital Audio: Dolby
®
TrueHD, Dolby
®
Digital Plus, DTS-HD Master Audio
™
,
and Dolby
®
Atmos
› CEC Pass-thru: From connected display to selected HDMI source
› Control: Front panel button, optical IR, RS-232 via Micro USB Port and included adapter cable
› Control System Support: Compass Control
®
Pro ready. Fully controllable by all IR, and RS-232
supported control systems via open API.
Included Accessories
› Power Supply: SK01T-0500100Z 5V/1A DC power jack, screw-in type
› IR Remote Control: KD-RMSWPROK
› Mounting Brackets: 2 L-shaped
› Control Cable: 6ft RS-232 3.5mm TRS to Micro USB, KD-S2X1XUSB2RS
Table of Contents
Introduction .................................................................... 1
Quick Setup Guide ............................................................... 2
Application Example .............................................................. 2
Front & Rear Panel Connections, Buttons, and LEDs .......................................3
IR Remote Control................................................................ 8
RS-232 Commands & Protocol ...................................................... 9
Specifications .................................................................. 11
Important Product Warnings & Safety Instructions: ....................................... 12
Contacting Key Digital
®
........................................................... 13
Warranty Information............................................................. 13
› Note: Please visit www.keydigital.com for the latest product documentation and software downloads.
Product features and specifications are subject to change without notice.
© 2022 Key Digital, Inc. All rights reserved.
Always follow the instructions provided in this Operating Manual.
KD-S2x1X-2 KD-S4x1X-2
Visit product pages for most
recent version of the manual,
quick setup guide, firmware,
control drivers and all
additional downloads.