Epson 500 Series - Manual (Page 47)

Connecting an External Monitor
The VIDEO port on your computer allows you to connect an
external color or monochrome VGA monitor. When a monitor is
connected, you can displayd data on either the LCD screen, the
monitor, or both at the same time. You can also display
higher-resolution video modes on the external monitor.
Follow these steps to connect a monitor:
1. Make sure both the computer and the monitor are turned off.
4-2 Connecting Optional Devices