Epson TM-i Series Easy Setup Manual page 32

When using a printer that can be controlled, enter the setting values for the number of
printers to be registered under [Printer] and [Network-Printer].
Input items for Printer cells
Be sure to designate a printer that designates this printer in the Printer cell. 
If the TM-i is designated, indicate only the Device ID and leave all other items empty.
Input items for disabled settings
Items with grayed out setting values are disabled.
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 When registering no printers
 Registering a single wired LAN printer
 Registering one wired LAN printer and one wireless LAN printer