4x4 HD Audio / Video
Matrix Switch
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R S -232
H DMI O U T
H DMI O U T
H DMI O U T
H DMI O U T
R S -232
H DMI O U T
H DMI O U T
H DMI O U T
H DMI O U T
RS-232 Controller
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OUTPUT
INPUT
GHMS8044
Direct
4
Max
64 (via cascade)
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Device: HDMI In
4 x HDMI Type A Female (Black)
Display: HDMI out
4 x HDMI Type A Female (Black)
RS-232 Port
1 x DB-9 Female (Black)
Power
1 x DC Jack
Switches
Port Selection
4 x Pushbuttons
LEDs
Selected
16 (Green)
HDTV resolutions up to 1080p;
Computer resolutions up to WUXGA (1920x1200)
DC 5.3 V, 9 W (max.)
Operating Temp.
0 - 50°C (32°F - 122°F)
Storage Temp.
20°C - 60°C (68°F - 140°F)
Humidity
0-80% RH, Non-condensing
Housing
Metal
Weight
4.1 lbs.
Dimensions
(L x W x H)
17 x 6 x 1.73 inch
Video Resolutions
Power Resolutions
Enviornment
Physical Properties
Function
Display Connections
HDMI Input Connections
Connectors
Specifications
Overview
Front View
1. Input Port Selection Pushbuttons
2. Input Port LEDs
3. IR Receiver
Back View
1. Power Jack
2. HDMI Output Ports
3. HDMI Input Ports
4. RS-232 Serial Port
IR Remote Control
1. Power On/Off Buttons
2. Display Selection Buttons
3. Source Selection Buttons
Operation
Hardware Installation
Cascading
Start Here!
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1. Make sure that the power to any device that you connect to the installation has been turned off.
2. Make sure that all devices you will be installing are properly grounded.
Installation of the GHMS8044 is simply a matter of plugging in the appropriate cables.
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Step 1
Use HDMI cables to connect the “HDMI In” ports on the
video display devices to the “HDMI Out” ports on the rear
of the GHMS8044.
Step 2
Use HDMI cables to connect the “HDMI Out” ports on the
source device(s) to the “HDMI In” ports on the rear of the
GHMS8044.
Step 3***
Plug the provided power adapter into an appropriate AC
power source; plug the power adapter cable into the
Power Jack on the GHMS8044. This completes the basic
installation of the 4x4 HDMI Matrix Switch. You may now
power on the display and source devices.
***Note: The matrix can take 15sec. to 60sec. to boot up
and capture EDID data.
To provide even more HDMI displays, additional GHMS8044 units can be cascaded from the parent
GHMS8044's HDMI Out ports, making it an excellent solution for digital signage systems. Simply use
additional Male-to-Male Type A HDMI cables to connect an HDMI Out port on the parent matrix to the
HDMI In port on the child matrix.
Recommended distances between devices in all cascade levels for transmitting a high resolution signal
are as follows:
Source device to GHMS8044 1.8m (5.9ft)
GHMS8044 to GHMS8044 15m (49ft)
GHMS8044 to display device 20m (65.6ft)
Source Device Selection
The GHMS8044 offers easy and flexible source and display device selection with either the front panel
pushbuttons, with the remote control, or through the RS-232 serial interface.
Manual Selection
To manually select an HDMI source for a display, press the pushbutton that corresponds to the port the
display device is connected to. Pressing the pushbutton will cycle the four attached HDMI source devices
through the display devices.
Note: The Port LEDs light to indicates which source device is currently selected for each display
Remote Control Selection
• To turn On and Off the GHMS8044, press the On and Off buttons on the remote control unit to the
desired setting.
• To select an HDMI source with the remote control, press the Input number button that corresponds to
the port the source device is connected to.
• To select an HDMI display with the remote control, press the Output number that corresponds to the port
the display device is connected to.
Note: Aim the remote control unit at the IR receiver located on the front panel of the GHMS8044. For
optimum performance, make sure there is a clear line-of-sight between the remote control unit and the IR
receiver. The Input and Output buttons 5, 6, 7, 8 are not used on the GHMS8044 and will have no effect
on the operation of the GHMS8044.
EDID Mode Selection
The GHMS8044 has 3 EDID mode that can be selected via the front panel butttons as follows:
1. Press button 1 for 3 sec. to enter the remix edit mode. All connected display’s EDID will be detected and
a best resolution for all will be selected to display.
2. Press button 2 for 3 sec. to enter the default mode. IOGEAR’s default EDID(highest 720p) will be passed
to the video source.
3. Press button 3 for 3 sec. to enter the port 1 EDID mode.
The EDID from the Port 1 Display will be
passed to the video source.
RS-232 Serial Interface
The GHMS8044’s built-in bi-directional RS-232 serial interface allows system control through a high-end
controller, PC, and/or home automation / home theater software package.(not included)
Configuring the Serial Port
The controller’s serial port should be configured as follows:
Baud Rate
Data Bits
Parity
Stop Bits
Flow Control
19200
8
None
1
None
Installing the RS-232 Controller
Step 4
In order to use the RS-232 serial interface,
attach a high-end controller (such as a PC) to
the GHMS8044 using a serial cable such as a
modem cable.
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