Intelligent Printer Data Stream (Ipds) - IBM 3174 Introduction Manual

Intelligent Printer Data Stream (IPDS)
The Intelligent Printer Data Stream (IPDS) is a structured field data stream
designed to manage and control printer processes. (See Figure 2-5.) It is easily
distinguished from previous printer data streams in that it supports all points
addressability (APA). The APA printing concept allows users to position text,
images, vector graphics, bar codes, and previously stored overlays at any point on
a page.
D D .
Intelligent
1--------1
Pri nter
Data Stream
Host 3174 APA Printer
Figure 2-5. Intelligent Printer Data Stream
Functional Description
System Attachment
The IPDS is transmitted from an application program to the printer within
structured fields that have been specifically designed for that purpose. The IPDS
commands within the data stream enable the host to control:
• Media handling
• Downloading and managing of symbol sets (fonts) and printer .. stored objects,
such as overlays and page segments.
The printer can later use the stored objects to construct a printed page. The IPDS
can significantly reduce the load on the host processor and the number of
characters transmitted to the printer in many advanced printing applications.
The IPDS is supported by:
• IBM 3174 Establishment Controller Configuration Support-A
(Release 2 or higher)
• IBM 3174 Establishment Controller Configuration Support-S
(Release 4 or higher)
• IBM 3174 Establishment Controller Configuration Support-B
(Release 1).
Printers capable of IPDS will be supported by both SNA and non-SNA controllers.
Attachment protocols are as follows:
• SNA
- Channel-attached
- SDLC-attached.
Note: Under SNA, support is limited to LU 1 only.
• Non-SNA
- Channel-attached
- BSC-attached.
Note: Under non-SNA, IPDS is carried only in the 3270 data stream.
Chapter 2. Features and Functions of the 3174 Controller
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