TN3270 Server Manual

CRT Communication Protocol
TN3270 Server Manual—424097-001
5-10
Extended Highlighting in SNAX/XF Mode
last-params [1].<8:15>
is the double-byte character set. If the -k option is not selected, the Guardian
TN3270 Server returns a 0 by default, indicating no double-byte character set. If
the -k option is selected, the Guardian TN3270 Server returns a 3, indicating
IBM MIXED.
Other SNAX/XF CRT SETMODE Procedures
Some SNAX/XF SETMODE procedures do not function in a TCP/IP environment or
with the Guardian TN3270 Server. The following SNAX/XF CRT SETMODE calls
produce an FEINVALOP (2) error code, but a properly coded application should
consider the operation successful:
SETMODE 53
requests that you obtain SNA sense code.
SETMODE 54
requests that you obtain device address.
SETMODE 112
requests that you place a session in between brackets.
SETMODE 115
requests that you set and obtain SNA control request notification.
Extended Highlighting in SNAX/XF Mode
Once the Guardian TN3270 Server is configured to run in SNAX/XF mode, Pathway
applications can display screen fields using extended highlighting. Extended
highlighting includes the screen attributes of blink, underline, and reverse video. If the
terminal can support extended highlighting display, Pathway sends these attributes to
client terminals connected by SNAX/XF. Pathway will not send extended highlighting
attributes to client terminals connected by AM3270.
Displaying fields with extended highlighting requires support from the client software at
your terminal. When a Pathway application needs to display fields using extended
highlighting, the Pathway TCP (Terminal Control Process) sends a READ PARTITION
QUERY data stream command to the client terminal. This command asks the client
program to return information about its characteristics, including whether or not it can
support extended highlighting. If the client program does not reply to this command, the
results can be unpredictable. Not all client software can display fields with extended
highlighting or handle the READ PARTITION QUERY command. Please check your
client software documentation before trying to use extended highlighting.