Gefen 4x1 DVI Switcher - Manual (Page 11)

7
BACK PANEL DESCRIPTIONS
1 5V DC
Connect the included 5V DC locking power supply to this receptacle.
2 In 1 - In 4
Each of these ports will accept a DVI source device.
3 DVI Out
This port will accept a single DVI output device. The currently selected DVI
input source will be output via this port.
4 RS-232
This port is used for serial communication using an RS-232 control device. For
details, refer to page 16.
5 Ext IR
Connect an IR extender (Gefen part no. EXT-RMT-EXTIR) cable to this port.