Lexmark C520 Reference Manual page 39

Menu item Purpose
NPA Mode Specifies whether the printer
performs the special processing
required for bidirectional
communication, following the
conventions defined in the Network
Printing Alliance (NPA) Protocol.
Note: Changing this menu item
automatically resets the printer.
Serial Buffer Configures the size of the serial
input buffer.
Note: Changing the Serial Buffer
menu item automatically resets the
printer.
Job Buffering Temporarily stores jobs on the
printer hard disk before printing.
Note: Changing the Job Buffering
menu item automatically resets the
printer.
Serial Protocol Selects the hardware and software
handshaking values for the serial
interface.
Robust XON Determines whether the printer
communicates availability to the
computer.
This menu item only applies to the
serial port if Serial Protocol is set to
XON/XOFF.
Using printer menus
Values
On
Off
*Auto
Disabled
*Auto
3K to maximum
size allowed
(1K increments)
*Off
On
Auto
*DTR
DTR/DSR
XON/XOFF
XON/XOFF/DTR
XONXOFF/DTRDSR
*Off
On
Menu Groups
39
Printer performs NPA processing. If
data is not in NPA format, it is rejected
as bad data.
Printer does not perform NPA
processing.
Printer examines the data to
determine the format and then
processes it appropriately.
Disables job buffering. Any jobs
already buffered on the disk are
printed before normal processing of
incoming jobs resumes.
Printer automatically calculates the
Serial Buffer size (recommended
setting).
User specifies the Serial Buffer size.
The maximum size depends on the
amount of memory in the printer, the
size of the other link buffers, and
whether Resource Save is set to On or
Off. To maximize the range for the
Serial Buffer size, disable or reduce
the size of the parallel and USB
buffers.
Does not buffer print jobs to the hard
disk.
Buffers print jobs to the hard disk.
Buffers print jobs only if the printer is
busy processing data from another
input port.
Hardware handshaking.
Hardware handshaking.
Software handshaking.
Combined hardware and software
handshaking.
Combined hardware and software
handshaking.
Printer waits to receive data from the
computer.
Printer sends a continuous stream of
XONs to the host computer to indicate
that the serial port is ready to receive
more data.