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Connections, Buttons and LEDs
Rear Panel Connections:
All connections to the KD-4X4 are found on the rear panel of the unit. Refer to the illustrations
below for port assignments while making connections
Power Connection
Serial IR
IR Eye
RS-232 Port
Operation Mode
Switch
HDMI Inputs
HDMI
HDMI
HDMI Outputs
Connections
½
HDMI Inputs:
The 4 HDMI Inputs are located in the center of the back panel. The Inputs have a
blue LED which will light when a source is connected and synced.
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HDMI Outputs:
There are 4 HDMI Outputs in pairs located on either side of the HDMI Inputs.
The Outputs have a blue LED which will light when a output device is connected and synced.
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The
RS-232, Serial IR, Optical IR Sensor, Operation Mode Switch and Power connections
are located on the right side of the back panel. The Operation Mode switch is used to update
the unit’s firmware which is done using the DB9/RS-232 port. The firmware version as well as
all RS-232 commands is available through the RS-232 command ‘H’. A detailed list of RS-232
commands is available later in this guide.
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If newer firmware is made available, complete
updating instructions will be included with it. Check
the Key Digital website for any firmware updates.
Front Panel Buttons and LED’s:
Output Select Buttons
Input LEDs
IR Eye
½
There are 4 Output buttons along the front panel.
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Each press of an Output button cycles through each of the 4 Inputs.
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A blue LED will indicate which Input has been selected for each Output button.
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There is also an Optical IR window located on the right side of the front panel for the remote
control signals.
Application Example
HDMI
Blu-Ray
Cable Box
Satellite Box
HD
M
I
HD
M
I
HD
M
I
HD
M
I
HD
M
I
HD
M
I
HD
M
I
HD
M
I
Display 1
Display 2
Display 4
Display 3
Apple TV
KD-4X4
RS232 Control
Serial IR
Optical IR
Optical IR
