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SPECIFYING INPUT PARAMETERS
4-54 XEROX DOCUPRINT 180 LPS PDL REFERENCE
Input sources
Data to be processed by the printing system may originate from
several sources. These sources are magnetic tape (offline
processing), a host computer (online processing in 3211 and 4245,
XPAF, or XPMF-VMS modes or communication through the
Ethernet). For information on XPAF, refer to Printing Documents
with XPAF User Reference. For information on XPMF-VMS, refer to
the Xerox Print Management Facility—VMS version User Guide. The
input-related concepts for online and offline processing are
presented in the following sections.
Online printing systems
This section describes various features of a Xerox laser printing
system that is channel attached to a host computer and explains how
you can access these features.
The LPS may have remote dial up communication interfaces.
Channel-attached LPS
A laser printing system equipped with the online interface unit (OLI)
may be attached to a byte multiplexer, block multiplexer, or selector
channel of an IBM 360 or 370, system 3000 or 4300 series, and 9370
models, or of an IBM system 390 ES/9000. The channel-attached
LPS operates in one-byte, six-byte, eight-byte, or burst mode. No
programming changes to the IBM operating system software are
required, provided that an IBM 3211 printer and 3811 printer Control
Unit is already supported on the host system.
A channel-attached LPS can receive input from the host computer in
online 3211 or 4145 mode. In online 3211 mode, the data stream
emulates IBM 3211 line printer format, with or without embedded
DJDEs.
Online 3211/4245 mode
Basic LPS input processing functions are augmented by the following
functions for online 3211 or 4245 mode operations:
• Handling of all interactions with the online interface (OLI)
hardware.
• Building of translate tables based on the present contents of the
universal character set buffer (UCSB) and the current FOLD or
UNFOLD command in effect.
• Processing of forms control buffers (FCBs) received from the
host to redefine channel-to-line number assignments and to set
margins based on the print position indexing byte.