Epson FX-2190 Reference Manual page 126

I/F (interface) mode
The printer provides a slot for an optional interface in addition to
its built-in parallel interface and USB interface. You can choose
Auto (automatic), Parallel, USB or Option for the interface mode.
When you select Auto, the printer automatically selects the
interface that is receiving data, and uses that interface until the
end of the print job. The Auto setting allows you to share the
printer among multiple computers without changing the
interface mode.
If only one computer is connected to the printer, you can select
Parallel, USB or Option, depending on which interface your
computer uses.
Auto I/F (interface) wait time
When the printer is in the auto interface mode and it receives no
data from the currently selected interface for the amount of time
specified with this setting, it determines which interface is
receiving data and switches to that interface. You can specify
either 10 seconds or 30 seconds for the auto interface wait time.
Parallel I/F bidirectional mode
The Parallel Interface bidirectional transfer mode is used when
this feature is on. If bidirectional transfer mode is unnecessary,
turn this off.
Packet mode
Make sure to select AUTO when you print from Windows
applications using the printer driver included in the Printer
Software CD-ROM that comes with the printer. Turn this feature
off if you have connection troubles while printing from
applications based on other operating systems such as DOS.
120 Control Panel