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Command
The command codes are very sensitive, do not change capitalization, spacing, or lettering.
Command Feedback Description
PWON PWON Power on
PWOFF PWOFF Power off
x1AVx1 x1AVx1 Route input 1 to the output
x2AVx1 x2AVx1 Route input 2 to the output
x3AVx1 x3AVx1 Route input 3 to the output
x4AVx1 x4AVx1 Route input 4 to the output
AUTOON AUTOON Turns the auto switching feature on
AUTOOFF AUTOOFF Turns the auto switching feature off
Status x1AVx1 Displays which input is currently connected to the output
Mreset Mreset Returns the switcher to its default settings
VER V0.91a Displays current firmware version
Each command or feedback is terminated with a carriage return.
Note: If the command fails or is incorrect the feedback should be “Command FAILED”
EDID (Extended Display Identification Data)
EDID is the exchange of capabilities between a source and display. This handshake ensures the audio
and video signals sent are supported by both source and display.
The AT-HD4-V41 has 3 EDID modes. Internal picks the highest common audio/visual signal between
the devices and the available supported EDIDs within the switcher. External selects the highest
common resolution between the current input and the display. Learned saves the EDID from the
current display and locks it to the output.
When switching between EDID modes the unit will need to be power cycled. To power cycle the
power cord will need to be unplugged and plugged back in.
Internal EDID
The Internally loaded EDID settings are the most common A/V signals that come standard in most TV
displays and computer monitors. The AT-HD4-V41 will pick the highest common resolution between
the devices.
External EDID
External EDID is the highest common audio/video signal between the current source device and
display. It is useful for devices with uncommon resolutions that are not stored internally. When
switching from internal to external EDID modes, press the EDID button so the external LED
illuminates, then power cycle the unit. When the AT-HD4-V41 is turned back on it will sync with the
display and determine the EDID.
Learned EDID
Learned EDID allows for a display’s EDID to be saved to the switcher’s nonvolatile memory. To learn
the EDID from the display you first need to be in external EDID mode. Once you’re in external EDID,
power cycle the unit then press and hold the EDID button until the red copy LED illuminates. Power
cycle the AT-HD4-V41 again and the display’s EDID will be used.
