FUJITSU DL9300 - Manual (Page 53)

SETTING UP
2-34 User's Manual
Using MS-DOS to Specify Serial Interface Settings
For an IBM PC or compatible device, use the following MS-
DOS MODE commands to set the computer serial settings to
match the printer factory settings:
MODE COM1:9600,N,8,1,P
MODE LPT1:=COM1
To activate these settings whenever you turn the computer on,
write the MODE commands in your AUTOEXEC.BAT file.
Make sure that the MODE.COM file is included in your root
directory.
If the printer still doesn’t work, consult your dealer or
someone experienced in serial interface communications.