Session parameter

VTAM® defines a standard session parameter set for LU type 0 3270 sessions. This set of parameters specifies with the following MODEENT macroinstruction in the IBM-supplied default logon mode table:

IBMS3270 MODEENT LOGMODE=S3270,                                        C
         FMPROF=02,                                                 C
         TSPROF=02,                                                 C
         PRIPROT=71,                                                C
         SECPROT=40,                                                C
         COMPROT=2000

If desired, the system programmer can replace this entry in the default logon mode table or define a different entry for each 3270 terminal as described in the z/OS Communications Server: SNA Resource Definition Reference. Do this to specify that you should not use brackets. The following table indicates the required and optional bit settings of certain session parameter fields. The definitions of these bits are in Specifying a session parameter, in the ISTDBIND DSECT.

FMPROF:   0000 0010
TSPROF:   0000 0010
PRIPROT:  0DRR 000B
SECPROT:  0100 0000
COMPROT:  00B0 0000 0000 0000

where:

D can be 0 or 1.
RR can be 01, 10, or 11.
B is 1 if brackets are used in the session.

Also, the system programmer can specify the PSERVIC parameter on MODEENT to convey information, such as display screen size or Query support, to the application program. SNA does not define the format of the presentation-services field for LU type 0; however, a good convention is to use the same format as used for LU types 2 and 3. See Specifying a session parameter for information on LU types 2 and 3.