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Xprint V7.0 architecture Introduction to administering Xprint V7.0
The printers are controlled by a supervisor and assigned tools, called
backends. A PCL is assigned to the printer.
The process of printing is controlled by a backend using the appropriate
printer’s PCL to provide printer details. Xprint V7.0 provides a general-
purpose backend but additional specific backends can be defined by the
administrator and incorporated into the Xprint V7.0 system. For a description
of how to define new backends refer to the “Xprint V7.0 - Reference
Manual”.
As the backend actually controls the printer, it must interface with both the
supervisor and the printer. The backend initializes the printer port and the
printer. It sets the printer with any specified job options, such as the typeface
and style. Furthermore, it ensures that start, end, and separator sheets are
printed if required. It also makes sure that the requested number of copies
of the document are printed. For this printer-specific information the backend
refers to the PCL assigned to the printer.
Backend programs interpret status messages. Information is taken from the
data passing through the backend. Some printers can respond to special
information requests from backend programs. To enable the user to interact
with the active print job (e.g. to delete or suspend the job) a special
mechanism allows signals to be exchanged between the supervisor and the
backend.
Permission lists enable printer access to be restricted to explicitly defined
users, and you can define which forms can be assigned to this printer. By
means of a security level, printers can be restricted to users with an appro-
priate security level for printing confidential data.
● Printer groups (-dgr)
Printers can be combined to form what are called printer groups to achieve
better loading of all the printers in the group. If a print job is sent to a printer
group it is printed on the first printer to become available in the printer group.
● Recovery rules (-rec)
Recovery rules are used to describe how specific printer conditions are
handled. Recovery rules are defined in a source file and saved in the Xprint
V7.0 database after compilation. Then they can be assigned to the printers.
The default recovery procedure in the case of a printer error can be
overridden by a recovery rule. In the case of the printer error “paper_end”,
for example, the Xprint V7.0 system tries by default to print the job until the