BrightSign Object Reference Manual (FW 5.1) - Manual (Page 106)

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The ifSetMessagePort interface provides the following:
• SetPort(obj As Object) As Void
"Auto" Video Mode
If the mode is set to "auto," the BrightSign player will try to determine the best video mode to use based on connected
hardware. The algorithm is as follows:
1. Try VGA first – If VGA is attached, use the highest-resolution mode (as reported by the monitor) that BrightSign
supports.
2. Try HDMI next – If HDMI is attached, use the highest-resolution mode (as reported by the monitor) that BrightSign
supports.
3. Default to 1024x768x75p.