Across the Boards
Communications Device Drivers
Section 5 - General Configuration and Usage Information
Page 213
cfSOFTWARE Confidential,
2000
5.17 Configuring the Telnet TN5250 Drivers
MAINCON Configuration Panel: E8: “Telnet TN5250”
Configuration of Telnet TN5250 Drivers
If MAINCON is not used to configure the Telnet TN5250 drivers, the driver will run as a IBM 3179-2 type of
5250 terminal, with no TCP/IP trace and using the Telnet Well-Known-Port as the default (#23).
MAINCON can be used to configure the TN5250 drivers to support additional types of terminals, including
some that support 27x132 mode. See the list of available types in MAINCON. The driver does not support the
Structured Field API, and when used with APPX must be run in buffer mode.
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 working 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.
MAINCON has a configuration option that controls the behavior of the message (or error) line. By default, the
message line will be separate as appropriate for the terminal model (resulting in a presentation space one line
larger than normal). MAINCON can be used to change the message line to always use the last line of the
display, which matches the behavior of some terminals, and many other emulators.
MAINCON has a configuration option that control what happens when the SysReq key is hit. By default, hitting
SysReq will place the terminal in SysReq mode, where a blank line is displayed and a command may be entered.
MAINCON can be used to change the normal behavior to match that of many other emulators which do not
permit the entry of the SysReq command, and which send a null command to the host immediately (this typically
results in the host sending the SysReq menu).
MAINCON also has options for changing the type of attributes returned (3270 style, 5250 style or AS/400
style), and for keyboard interpretation (3270 style or 5250 style). The 3270 modes exist primarily for 3270
applications that do not understand 5250s. The mapping for 5250 style attributes to 3270 attributes is not
perfect, and the resulting color schemes will not be completely correct, but it is usable.
NOTE
: Dialog requires the use of 3270 attribute and mode.
See Section 6.28 for additional TN5250 configuration options.
Operation of Telnet TN5250 Drivers
These drivers implements all TN5250 functions including NVT mode if the host does not support TN5250. A
new MAINCON configuration panel exists to support these drivers. This allow the configuration of terminal
type 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. Other configuration options are provided as well.
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