EDID — Extended Display Identification Data
EDID is the data structure a display presents to a source to advertise its supported resolutions, refresh rates, and audio formats — the root cause of most HDMI "no signal" and wrong-resolution failures.
glossaryvideohdmiedidswitchingtroubleshooting
HDCP — High-bandwidth Digital Content Protection
HDCP is the content protection handshake required on every HDMI link carrying protected content — a single non-compliant device in the chain blocks the signal entirely.
glossaryvideohdmihdcpswitchingtroubleshooting
RS-232 — Serial Control Interface
RS-232 is the most common wired control interface in AV — used to control displays, projectors, PTZ cameras, and DSPs from control processors via simple ASCII or binary command strings.
glossarycontrol-systemsrs232serialtroubleshootingvisca+1