Epson BrightLink 1485Fi 5000-Lumen Pixel-Shift Full HD Ultra-Short Throw 3LCD Interactive Laser Projector - Manual (Page 311)

311
Multiple Projector Operation Settings - Multi-Projection Menu
Settings on the Multi-Projection menu let you set up multiple projectors to project a single unified image
(BrightLink 1485Fi).
Setting Options Description
Projector ID Off
1 through 9
Assigns an ID for the projector
when you use multiple projectors
HDMI Out Setting Pass Through
Process Out
Off
Set to Pass Through to enable
up to four projectors connected
via HDMI cables to project a
unified image.
Set to Process Out to enable
use of interactive pens or finger
touch operations for up to two
projectors.