Epson LX-300+ User Manual page 61

High speed draft
When you choose On, the printer prints up to 300 cps (characters
per second) at 10 cpi (characters per inch). When you choose Off,
the printer prints up to 225 cps at 10 cpi.
I/F (interface) mode
The printer comes with a built-in parallel interface and serial
interface.
If your printer is connected to only one computer, select Parallel
or Serial for the interface mode, depending on the interface you
use. If your printer is connected to two computers, select Auto
(automatic) to allow the printer to automatically switch between
interfaces depending on which one is receiving data.
Auto I/F (interface) wait time
This setting takes effect only if an optional interface is installed
and the auto interface mode is selected. This setting determines
how long the printer waits when it no longer receives data from
an interface before it checks whether a print job is being sent
through the other interface. You can specify 10 seconds or 30
seconds for the auto interface wait time.
Baud rate
Use this option to set the data transfer rate (baud) for the serial
interface. The baud rate is measured in bits per second (bps). See
your computer manual and software documentation for the
proper setting.
Parity
When this option is set to None, parity checking is disabled. The
parity bit, if used, provides a basic form of error detection. See
your computer manual and software documentation for the
proper setting.
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Using the Printer