IBM 3174 Reference Guide

Host Identifier
Host Descriptor
Establishing Muitipie Host Connections
The host identifier (station set identifier for ASCII hosts) Is located In positions
18-20 of
the status line (see Figure 1-1 on page 1-4). It gives you additional
Information about your
session and Is updated each time you use the
Change-Screen key sequence. The host Identifier Is 3 characters long and
qualifies the LT Indicator. Itdiffers depending on the type of host the session Is
communicating with, IBM or ASCII.
When you are using an ASCII terminal with an ASCII host, no host Identifier
appears.
The host descriptor (station set descriptor for ASCII hosts Is located In positions
31-50 of
the status line (see Figure 1-1 on page 1-4). It Identifies the host with
which a session Is In communication. The host descriptor status line area Is
updated each time you use the Change-Screen key sequence or you make a
selection from the 3174 Connection Menu.
Like the host Identifier, the host descriptor varies depending on the type of host
your session Is using to establish communication.
IBM Hosts (3270type): This field can contain the host descriptor, which has a
maximum length of 20 characters.
ASCII Hosts: When you are using a 3270 terminal as an ASCII terminal, the station
set descriptor Is displayed In this position. If the station set descriptor Is longer
than 20 characters, only the first 20 characters are displayed.
If an update to any of the areas replaced by the host descriptor occurs while the
host descriptor Is displayed, the host descriptor Is erased and the original areas
appear Inthe status line. In most cases, you can remove the host descriptor by
using
RESET. If no host descriptor Is defined, the Indicators normally displayed In
this area appear.
Error Messages
If you try to access a session that Is not available, you may get one of the following
messages:
2%%
399
325.
These error messages indicate that there may be a controller hardware or
configuration problem. Notifyyour system administrator about the error number,
and use RESET to use your current active session. If RESET does not work, use
the change-screen sequence to access the next LT.
Change-Screen Key Sequence
The Change-Screen key sequence allows you to access the different sessions that
are defined for your terminal. This key sequence saves the current active session
In the background and the next background session becomes the active session. In
a round-robin fashion. Background sessions are not affected by anything you key
In during the active session.
Chapter 1. GettingStarted 1-5

IBM 3174 Specifications

General

Brand	IBM
Model	3174
Category	Controller
Language	English