IBM 4400-006 - 4400 Model 006 B/W Direct Thermal User Manual page 272

Chapter 15
Complete Command List
set prn flush
set prn unlock
set prn timeout minutes |none
example: set prn timeout none
set prn [-]opost
example: set prn -opost
set prn [-]onlcr
example: set prn -onlcr
set prn xtab tablength |none
example: set prn xtab none
set prn from default
set prn from stored
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Flush the data in the parallel port input and output buffers.
Release the access lock on the parallel port.
Terminate the print job sent to the parallel port if it is not printed
after the timeout period in minutes expires. The minutes
value ranges from 0 though 255, with 0 indicating no timing out
to take place. This is the default setting and should be fine for
most print setups.
Allow or disallow output processing on the parallel port such as
carriage return insertion (e.g., onlcr).
Enable or disable carriage return insertion on the parallel port.
This may be needed for Unix text jobs coming through with
solitary linefeeds. This feature is almost always set at the
model level rather than the I/O port level.
Set the tabstop width as indicated by tablength. The range is
1 through 16 spaces.
Set all parallel port settings back to factory defaults.
Set all current parallel port settings to the values stored in flash
memory.