Page 1¶

SNA 3270 Program Access II¶

ND211279

graph TD
    A[IBM HOST]
    A -->|SNA Gateway II (SDLC)| B
    A -->|SNA Gateway II (SDLC)| C
    B -->|COSMOS Connection\n(LAN or WAN)| C
    B -->|LU type 2| D[ND SNA 3270<br>Program Access II]
    B -->|LU type 1,2,3| E[ND SNA 3270<br>Term. Emulator II]
    C -->|LU type 1| F[ND SNA RJE II<br>Remote Job Entry]
    F -->|Job Output| G
    G -->|Job Input (queue)| F

ND
Norsk Data

Page 2¶

SNA 3270 Program Access II¶

Introduction¶

The SNA 3270 Program Access II enables an application on an ND computer to log on to an IBM mainframe application (IMS, CICS™, TSO®), and to read and update a central database.

The SNA Gateway II software runs in a separate processor (PIOC). This offloads much of the communication protocol handling from the ND-100 processor. Another advantage is that SNA 3270 Program Access II works over the ND COSMOS network system. This cooperation with COSMOS allows distribution of SNA 3270 Program Access to several CPUs, while only one computer is connected to the IBM mainframe.

Features¶

ND to IBM Program-to-Program communication
Starts a session with the host application as a 3270 Terminal
Separate communication processor (PIOC)
SNA Gateway to host (SDLC)
Connection to IBM 370, 30XX, 43XX, 8XXX computers
Simultaneous use of other ND SNA products on the same line to the host
Support through the COSMOS network to the ND SNA Gateway computer
Multiple Program-to-Program sessions simultaneously

Product Description¶

The ND SNA 3270 Program Access II is a library of subroutines that can be used in local ND programs for communication with IBM programs. SNA 3270 Program Access II has been developed from the SNA 3270 Terminal Emulator, and many service routines are common to both programs.

The communication between the local ND program and the IBM program is logically divided into three phases: - Logging on - Dialogue - Logging off

A script file is used when logging on and off. This file contains the interactions that are to be performed. The advantage with this facility is that it makes application programming easier and simplifies application maintenance.

In the dialogue sequence, the local application may call the subroutines supplied for sending and receiving host application data. In addition, there are routines for reading and writing data into the screen buffer. Each field may be addressed as a buffer with field number, or by line and column number.

It is also possible to use the Script file in the dialogue phase.

The nature of the product demands familiarity with the host application to be communicated with. Knowledge of the screen formats as well as their sequence is a necessity. ND therefore recommends that the ND SNA 3270 Emulator II be used when the format of the Script file is defined.

The ND SNA Gateway II software and hardware are required, and contain the communication part (SDLC protocol emulation) and the interactive part. To offload the main computer, these parts run in a separate processor (PIOC).

ND SNA 3270 Program Access II emulates IBM’s PU type 2 and LU type 2.

Requirements¶

ND-1xx/5xx/5xxx system
SINTRAN III VSE/VX version K or later
PIOC (with 512 kB memory) ND 108670
SNA Gateway II Software ND 211277
COSMOS Basic ND 210374 (if networked ND system)

Documentation¶

Document	Reference
SNA 3270 Program Access II, Programmer’s Guide	ND-860310.1 EN
SNA Gateway II Supervisor’s Guide	ND-830113.1 EN
ND SNA Gateway II, Host considerations	ND-860350.1 EN

Abbreviations¶

Abbreviation	Description
CICS	Customer Information Control System
IMS	Information Management System
TSO	Time Sharing Option
SNA	System Network Architecture
SDLC	Synchronous Data Link Control
PU	Physical Unit
LU	Logical Unit
PIOC	Programmable Input Output Controller

Contact Information¶

CORPORATE HEADQUARTERS         WEST GERMANY                    SPAIN                
Tel: 47-2-626000               Tel: 49-6172-4080              Tel: 34-3-2152287   
NORWAY                         BELGIUM                        SWITZERLAND          
Tel: 47-2-626000               Tel: 32-2-7251560              Tel: 41-21-250212   
SWEDEN                         FRANCE                         HONG KONG           
Tel: 46-760-98400              Tel: 33-1-45771200             Tel: 852-5-411912/410253   
DENMARK                        IRELAND                        USA                 
Tel: 45-2-626055               Tel: 353-1-427244              Tel: 1-617-366-4662 
FINLAND                        LUXEMBOURG                     ND COMTEC HEADQUARTERS
Tel: 358-0-368111              Tel: 352-496617/8/9            Tel: 47-2-626000     
UNITED KINGDOM                 THE NETHERLANDS                ND COMTEC AUSTRIA    
Tel: 44-635-35544              Tel: 31-3402-72411             Tel: 43-2266-5355    

PAKISTAN                       THAILAND                       ICELAND             
Tel: 92-51-851446              Tel: 66-2-253-9882/4           Tel: 354-1-637111   
INDIA                          ND COMTEC USA                                       
Tel: 9144-419217/419126       Tel: 1-316-636-5000