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Specifying input parameters
2-2 Using LCDS Print Description Language
Input processing functions
The following functions are part of input processing on the
FreeFlow Print Server LCDS systems.
Input processing online
For online printing, the LCDS data is transmitted from a host
computer either directly or through a protocol converter. The
FreeFlow Print Server LCDS systems receive print data either
over a channel through bus and tag cables, or through the
Socket Gateway or lpr using TCP/IP protocol.
The LCDS data stream emulates the IBM 3211 or 4245 line
printer format. All commands coded for the 3211 may be coded
for the 4245. In online 3211 mode, the data stream emulates an
IBM 3211 line printer format, with or without embedded DJDEs.
Basic input processing functions are augmented by the following
functions for online 3211 or 4245 mode operations:
• Handling all interactions with the online interface hardware.
• Building translate tables based on the present contents of the
current FOLD or UNFOLD command that is in effect.
• Processing form control buffers (FCBs) that are received
from the host to redefine channel to line number
assignments.
Specifying DJDE
processing online
Online printing is controlled through parameters from a user
defined .JDL file. You can dynamically override these
parameters by Dynamic Job Descriptor Entries (DJDEs).
The DJDEs that you specify are processed by the system as part
of the input print data from the host. The IDEN command
enables the system to identify DJDEs as commands and not part
of the input data. Refer to the “IDEN command” section later in
this chapter for information on the use and parameters of this
command.
Nonprint files, such as font files, can be downloaded from the
host using the FILE command. Refer to “FILE DJDE” in the
“Using Dynamic Job Descriptor Entries (DJDEs)” chapter of this
guide.