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Appendix C. Printer Authorization Matrix
Description
The 3274 printer authorization matrix is required for local copy operations. Local copy
between Category A terminals can be either host-initiated or Print-key-initiated. Local
copy between Category B terminals must be host-initiated. Local copy operations cannot
be performed between Category A and Category B terminals.
• Establish Printer Mode. A print'er may be reserved for exclusive use of either the host
or the local copy function. A third mode allows a sharing between these two
functions .
• Assign Print "Classes." A print "Class" is a way of grouping printers for use by local
copy. A local copy request directed to a "class" is then serviced by one of the printers
assigned to that group.
• Define Source Device lists. The source device list specifies which displays may use any
given printer for local copy. Note that all displays for a printer must be attached to the
same adapter type as the printer. For example, a Category A printer can have only
Category A displays in its source device list.
Printer Modes. A printer may be in one of three modes, specified in the printer
authorization matrix as local, system, or shared mode. Each printer on the 3274 defaults
to system mode until a matrix is loaded. Printers that are specified as being in shared or
local mode then become available for local copy use.
Local Mode. A printer in local mode may be used for local copy functions regardless of
host attachment or communications protocol. This means that displays within the cluster
may contend for use of printers but the host may not. The printer is not available for
direct print operations from the host.
A local copy operation involves the transfer of data from the display buffer to the printer
buffer and the subsequent printing of that data. A local copy may be initiated by an
operator using the Print key on a 3278 or 3279 attached to a 3274 or by the host when
the display is operating in SNA/SDLC.
System Mode. A printer in system mode is entirely under host (system) control. This is
the default mode each printer assumes when no matrix has been defined. The printer
cannot be used for operator-initiated local copy requests. The printer is likewise not
available for host-initiated copy operations when using SNA/SDLC. However, when
operating with BSC discipline, the printer may honor a BSC Copy command when it is in
system mode. The BSC Copy command, directed to the "to" device, specifies the "from"
device as a command parameter and does not use the printer authorization matrix.
Shared Mode. In shared mode, both host-directed printing operations and local copy
operations are permitted on the same printer. When in system mode, the printer is
protected from local copies; in local mode, the printer is protected from host-initiated
operations. In shared mode, however, the subsystem does not guarantee this type of
integrity. The user must assume responsibility for the integrity of his printed data by
"installation rules" and proper programming practices when using a printer in shared
mode.
In SNA/SDLC, a printer in shared mode attached to the 3274 may be used for local copy
only when it is not in session with a primary logical unit (PLU) in the host.
Appendix C. Printer Authorization Matrix C-l
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