IBM 1725 SLS - Manual (Page 52)

Communications
QMS 1725 SLS Print System User's Guide 2-18
Mode
Enables or disables the serial port.
Emulation
Sets the serial interface emulation.
Minimum Number of Kilobytes for Spooling
Sets the minimum number of kilobytes of system memory allocated to
the serial interface.
Menu Administration/Communications/Serial/Mode
Choices Interactive—Establish two-way communication between the
host and the printer.
Noninteractive—Establish one-way communication from the
host to the printer.
Disabled—Turn off serial communication with the host. The
printer stops accepting print jobs over the serial interface.
Default Interactive
Notes The printer must be restarted for changes to the Mode menu to
take effect. You can either let the printer restart automatically
after you save the change and exit the Configuration menu, or
you can wait for the change to take effect the next time you
manually turn on the printer.
Menu Administration/Communications/Serial/Emulation
Choices ESP, Hexdump, PostScript, PCL5, HPGL, CCITT, Lineprinter
Other optional emulations also appear, if installed.
Default ESP
Menu Administration/Communications/Serial/Min K Spool
Choices 00000-99999
Default 00015