Epson EB-G5200W - Manual (Page 31)

Restrictions in the Target Projector when Using Multiple Projectors 31
Setting the Remote Control ID
When the ID switch on the side of the remote control is Off, remote
control ID is disabled, and you can operate with the remote control
regardless of the projector's ID setting. When the ID switch is set to On,
remote control ID is enabled, and you can define which projector to
operate. Also, perform settings for the remote control ID with the ID
switch set to On.
A
Set the remote control ID switch to On.
B
While holding the [ID] button, press a number
button to select a number to match the ID of the
projector you want to operate.
Once this setting has been made, the projector that can be operated by
remote control is limited.
Procedure
Keep pressed
q
The remote control ID setting is saved in the remote control.
Even if the remote control batteries are removed to replace
them and so on, the stored ID setting is retained. However,
if the batteries are left out for a long time, it is reset to the
default value (ID0).