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Across the Boards

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Communications Device Drivers

Section 5 - General Configuration and Usage Information

Page 181

cfSOFTWARE Confidential,

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2000

5.2 Configuring the Telnet TN3270 Drivers

MAINCON Configuration Panel: E1: “Telnet TN3270”

MAINCON Configuration Panel: E7: “Telnet TN3270 with TN3287”

Configuration of Telnet TN3270 Drivers

If MAINCON is not used to configure the Telnet TN3270 drivers, the driver will run as a basic (non-enhanced,

non-SF) 3270 Model 2, with no TCP/IP trace and using the Telnet Well-Known-Port as the default (#23).

MAINCON can be used to configure the TN3270 drivers to support 3270 Models 2, 3, 4 and 5. If the host is

capable of it, the enhanced 3270 support, which includes EABs and structured field support, can be configured

by configuring the 3270 model as 2E, 3E, 4E or 5E. Enhanced 3270 support must be configured if structured

field support is required (for example in APPX). If the driver is configured for enhanced 3270 support both the

SF and non-SF APPX connections are available. Only the non-SF APPX session is available with basic 3270

support.

NOTE

: Most TN3270 hosts support the enhanced 3270 terminals.

MAINCON can be used to enable a trace of the TCP/IP activity between the driver and the host. Entering a

trace size other than zero will enable the trace. The trace data is kept in a circular buffer and will be written

when the driver is closed. A file called TCPTRAC.BUF will be produced in the current directory. The program

TRACEFMT.EXE will format the TCPTRAC.BUF file.

MAINCON can also be used to alter the default destination port on the host. If nothing is entered, MAINCON

will default to the Telnet Well-Known-Port (#23).

MAINCON can also be used to set “disconnect at denegotiate” mode. When enabled, this mode forces the

Telnet session to disconnect whenever a host action that would normally only cause a drop to NVT mode

occurs.

See Section 6.21 for additional TN3270 configuration options.

Operation of Telnet TN3270 Drivers

These drivers implement all TN3270 functions including NVT mode if the host does not support TN3270. A

new MAINCON configuration panel exists to support these drivers. This allows the configuration of terminal

type (3270 Models 2, 3, 4 or 5, with or without EABs and structured field support), the size of the internal trace

buffer, and the default destination port address to use if the Telnet well-known-port is not being used.

When first opened, the drivers display an NVT screen with a message requesting entry of the host name or

address. The NVT screen consists of one enterable line (at the bottom), and a scrolling message area above the

enterable area. Model 3270 field attributes are emulated on the NVT screen by the driver. The OIA indicates if

the driver is disconnected (“disc” at the beginning of the OIA), in NVT mode (“NVT”) or in a TN3270 session

(“TA#” for the LU-LU session or “TA?” for the SSCP-LU session).

Section 5.4. TCP/IP Host Names and Addresses describes the addresses that can be entered to connect to a host.

In addition, when connecting to a TN3270E host, an LU name may be requested. This is done by coding the

reqested LU name on the host name line after a colon.

Example:

CF370.CFSOFT.COM :LU2T0001

- Requests LU “LU2T0001”

The ApkTest key causes the driver to disconnect from the host and return to disconnected NVT mode.

In NVT mode, the ApkPF12 key functions as a “retrieve” key, and will redisplay recently entered items.

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