Lexmark T630n VE Reference Manual page 382

Serial Computer Configuration Recommendations (RS-422)
For correct operation of the RS-422 serial interface, make sure you have:
The following is an example of how to configure DOS for the printer using serial
XON\XOFF protocol:
DOS:
Run the software you received that supports your RS-422 adapter card or complete
the following:
From the DOS prompt, enter the following commands:
mode comy:9600,n,8,1,p
where
Include these two command statements in the AUTOEXEC.BAT file on the computer
so they run each time your system starts operating.
Once this is set, to copy to the communications port again use the copy command:
copy 'filename' lptx
•
Installed an RS-422 adapter card in your host computer.
•
Set up the IRQ according to the RS-422 documentation that you received
with the RS-422 adapter card.
•
Installed support software for the RS-422 adapter card if you use DOS.
•
Purchased an RS-422 cable meeting the requirements according to the RS-
422 documentation that you received with the RS-422 adapter card.
mode lptx :=comy
x
equals 1, 2, or 3, and
8-44
y
equals 1 or 2
Interfaces