Monitor controllers sit between the source and display to manage the HDMI handshake, using built-in or uploaded Extended Display Identification Data (EDID) to present the display’s supported capabilities to the source. They also provide High-bandwidth Digital Content Protection (HDCP) management to help coordinate protected-content authentication between connected devices and support reliable signal delivery.

Monitor controllers may support TCP/IP, RS-232, infrared (IR), and Consumer Electronics Control (CEC) for display power and other control commands. Depending on the model, they can use pre-stored or user-programmed commands, with some also supporting automatic control based on an active or disconnected video signal.

Monitor controllers can detect when a source connects or an active video signal is present, then send power-on commands to a display through CEC, RS-232, IR, or IP control. When the source disconnects or the signal remains inactive, they can send a power-off command and apply standby or projector lamp-cooldown timers.

Installers should review HDMI video requirements, including supported resolution and refresh rate, 4:4:4 chroma sampling, HDR formats, HDCP, and EDID management for reliable source-to-display communication. They should also confirm the needed control connections, such as TCP/IP, RS-232, IR, or CEC, along with whether the controller uses local power or supports Power over Ethernet (PoE).