Eicon Networks CX1 Manuel d'installation télécharger pdf (Page 53)

G&R

The TCP/IP handler

You start this handler (gl_tcp) when you specify -li tcp as the line

handler for a Host Links product. When you connect from one G&R

product (or GlAPI application) to another the TCP/IP handler uses a ‘raw’

mode; the application data is simply packed in TCP packets and transmitted

with no higher-level protocol involved. Terminal sessions use the Telnet

protocol to reach standard Telnet servers, TN3270/TN3270E to reach TN3270

servers, TN5250 to reach TN5250 servers and TNVIP to reach TNVIP servers.

Terminal sessions use Rlogin protocol when user identification is to be passed

between UNIX/Linux client and server systems.

Making connections using TCP

Accepting a connect

If you configure a local port number (-lp), products and applications can use

the TCP handler to receive connections.

Note that you must give the local port parameter at startup in the command line

or configuration file for it to take effect. You can start two products on the same

or two different systems and then connect from either to the other to establish

interactive communication between two terminals or applications.

Issuing a connect

TCP connections in ‘raw mode’ are always two-way simultaneous. Any

concept of ‘turn’ to determine initiative must be implemented in the

applications. The ‘end of data’ marker is set following criteria depending on

application mode, and is mapped to ‘end of group’ for the application using the

handler. It can be interpreted as ‘turn’.

For TNVIP, TN5250 and TN3270 connections the concept of turn is included

in the protocol, and mapped to ‘end of group’ for the applications using Gline.

Gline Line Handlers and Configuration

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Eicon Networks CX1 Manuel d'installation Page 53