The serial number can be found on the back of the Eclipse terminal. The serial provides information regarding the functionality and series of the device.
Ex Serial: C-12345Y-ECL
The prefix ("C") indicates that this is Copy only model. Other prefixes include "F" (Fax) and "X" (CFX - Copy/Fax).
The "Y" following "12345" indicates the series. Other series Eclipse will have an "X", or contain no letter at all.