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HP SNA 3270 Data Stream Programming
SPD 26.87.11
Interface for OpenVMS, Version 1.8
This product is a set of subroutines used to perform
Asynchronous Event Notification
such functions as establishing sessions, sending data,
receiving data, and disconnecting sessions. In addition,
The 3270 DS product provides a mechanism for an
the 3270 DS interface may be used to interpret the 3270
OpenVMS user application to receive control when an
data stream and build a screen image. The OpenVMS
asynchronous "network event" occurs, such as discon-
application is then free to interact with the screen image.
nection of a DECnet logical link, an SNA circuit failure,
or the receipt of an Unbind Type 2 from IBM. The Open-
The 3270 DS product allows two modes of connection:
VMS application is called at a notification entry point de-
Data Stream Mode and Field Mode.
fined by the application at connection time; an indication
of the event that occurred is reported.
Data Stream Mode
User Interface
Data Stream Mode provides a means to send and re-
Users of the 3270 DS product should be experienced
ceive uninterpreted 3270 data streams as defined by
OpenVMS application programmers. They can use any
IBM. In this mode, the interface performs all SNA-
of the OpenVMS programming languages that conform
specific functions. For example, the OpenVMS applica-
to the OpenVMS Calling Standard to create application
tion is not required to handle chaining, brackets, RUs, or
programs that interact with application programs on an
RHs. At the same time, this mode allows the interface
IBM system. The user documentation provides example
to provide the OpenVMS application with the complete
segments written in the following languages:
3270 data stream. It is the OpenVMS user’s respon-
sibility to interpret the outbound data stream for 3270
orders and commands, and to build and manipulate a
• MACRO-32
screen image (if desired). Similarly, it is the OpenVMS
user’s responsibility to build the inbound data stream
• BLISS-32 Implementation Language
from the user’s own screen image or from some other
data structure.
• C
An OpenVMS application that needs to use extended
• COBOL
attributes must use a Data Stream Mode connection.
Extended attributes are extensions to the basic field at-
• FORTRAN
tributes, namely:
• PASCAL
• Extended highlighting (blink, reverse video, under-
score)
• PL/I
• Color
Users of the 3270 DS product are not required to have
extensive knowledge of SNA.
• Programmed symbols (selectable symbol set)
• Screen partitions and windows
INSTALLATION
Field Mode
Installation services from HP are recommended for
a customer’s first purchase of this software product.
These services provide for installation of the software
Field Mode performs a presentation service to provide
product by an experienced software specialist.
a screen image interface. The screen image may be
read field by field, or accessed directly. The interface
interprets 3270 commands and orders in an outbound
data stream to build the screen. In addition, it produces
HARDWARE REQUIREMENTS
an inbound 3270 data stream from the updated screen
image.
Processors Supported
As with the Data Stream Mode, Field Mode insulates
Itanium, Alpha and VAX configurations as specified in
the OpenVMS user from the SNA protocol. Extended
the OpenVMS Operating System for I64, Alpha and
attributes are not supported by the Field Mode connec-
VAX Software Product Description (SPD 82.35.xx and
tion.
25.01.xx).
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