Xerox 721P88200 - Manual (Page 45)

DOCUPRINT IPS SYSTEM
DOCUPRINT IPS SOLUTIONS GUIDE 3-5
These command sets have corresponding towers. Figure 3-2 shows
the data and resource towers and their associated command sets.
Figure 3-2. Towers and command sets
During initialization, the IPDS command sets are communicated to
PSF by the Acknowledge Reply to the ‘Obtain Printer Characteristics’
command. The IPS responds to PSF with the data tower and
resource tower command sets. These command sets are part of the
Device Control function set (DC1), which is composed of commands
and an acknowledge protocol. The commands set up the logical
page environment and communicate device controls. The
acknowledge protocol transmits printer characteristics, status,
resource information, and error information to PSF.
Data towers
The following sections define the command sets for the data towers.
Text function set – PTOCA (PT1, PT2, and PT3)
The text command set is composed of the IPDS command for
presenting text information in a page, a page segment, or an overlay.
The lowest level of this support is known as PT1. The next level, PT2,
allows the use of Overstrike, Underscore, and Temporary Baseline
Move (for superscript and subscript). Then comes PT3 which
includes an additional extended text color selection method.
IM Image function set (IM/1)
The IM-image command set contains the commands for presenting
image raster data on a logical page, a page segment, or an overlay.