Note about edid mixing – Hall Research VSA-HA-DP User Manual

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HDMI Wall Plate with Audio Extraction

When an invalid checksum is detected, that byte (at the end of 128 bytes) is highlighted

in RED. This helps identify invalid EDID checksum values that can cause connectivity

problems.
If you perform an action that affects the EDID, it is possible for the checksum to

momentarily show ‘RED’ until the complete EDID has been updated on the screen.
You cannot “LEARN” an EDID that has an invalid checksum!
The GUI interface software WILL let you IMPORT EDID’s that contain invalid checksum

data for testing purposes.

2.9. Note about EDID Mixing

At power up, the default EDID stored within the device is loaded. This could be either the

factory default or a ‘Learned’ EDID.
If a functioning and valid SINK device is connected to the VSA-HA-DP ‘Output’ connector

AND the VIDEO mode is set to PASS-THRU, the EDID from the SINK will be read and

loaded into memory.
If the SINK EDID read is a simple 128 byte EDID (like a VGA monitor), a CEA-861

extension block (2nd 128 bytes) will be added to the EDID with a default native resolution

of 480p and with LPCM 2 channel audio.
If the SINK is disconnected from the VSA-HA-DP connector, the internally saved EDID

will be presented to the SOURCE mixed according to the AUDIO settings. Each time the

VIDEO or AUDIO EDID GUI controls are pressed, the EDID presented to the SOURCE is

would be as shown in the following table: