USB preferences Configure USB settings in Preferences > USB.VISCA ControlSet Shell to VISCA.For Icon 400|450|600: Select the device connection type: HDMI or DVI.For Icon 800: Select the device connection type: DVI0, DVI1, DVI2, or DVI3.Select Advanced to set the speed and flow control of the serial connection.Serial ControlSet Shell to Serial.Select the speed of the serial connection.Select the flow control of the serial connection: hardware or software flow control; or no flow control.