Epson BrightLink 421i Guide D'installation page 27

3. Route the cables through the arm unit
Route the projector's power cord and any additional cables connecting to the projector through the arm unit.
Be sure to also route the cables for any optional equipment (ex. document camera,
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speakers, etc.) that may be used in the future. Otherwise, each time you need to
connect another device, you will need to remove the projector from the mount to
connect additional cables.
Caution
Problems may occur if you use this product without routing the cables through the arm unit.
Route the USB cable so that the type B connector emerges on the projector side. Epson
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recommends labeling any duplicate cables (ex. USB cables for interactive module
[BrightLink 425Wi/430i/435Wi] and USB Display, etc.) so that additional connections
can be more easily identified.
4. Attach the wall mount to the wall plate
1. Attach the hook on the arm plate to the bar on the wall plate.
Arm unit
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Vertical adjustment
screw