Prentke Romich Company
http://www.prentrom.com/support/article/504

How do I Connect a Projector/Monitor to my ECO?

Connecting to a Projector or Monitor is easy to do.

With the ECO turned off, simply plug your external device into the Monitor connector (15 pin connector) on the left side of the device.

This is a picture of the left side of the device.

Turn your device on. Your ECO screen should now appear on your external device.