Checking requirements for LOGON MODE tables

When a static VTAM® terminal is connected to IMS and a session is initiated, VTAM needs to know the LOGON MODE identifier.

A VTAM LOGON MODE table contains the SNA bind parameters for the session and the identifier (the LOGMODE parameter value, which is used at logon) for that terminal. Also, a default identifier for each SDLC-connected terminal exists.

These considerations apply to static VTAM terminals.

Coordinating LOGON MODE identifiers

When you are deciding on the LOGON MODE identifiers, you need to:

Match the naming conventions that are being used for the VTAM network in your installation. Your choice of a name might need to follow this convention.
Arrange for automatic starting of IMS-remote terminals, or have them controlled by the VTAM operator. Otherwise, choose names that are meaningful to a remote terminal operator, if in order to initiate a session the remote terminal operator (RTO) enters the VTAM LOGON command.
Choose names that are helpful to the master terminal operator if sessions are to be started with the /OPNDST command. If a terminal can be operated with different SNA protocols, the name should help distinguish between the operating modes.
Use the MODETBL keyword on the TERMINAL macro or ETO logon descriptor to specify the default identifier that is to be used in the following situations:
- The default identifier is not used.
- The terminal operator does not specify the identifier in the LOGON command.
- The master terminal operator does not specify the identifier in the /OPNDST command.

Examples

The code below illustrates the nature of the LOGON MODE table entries that are described to VTAM for a 3270 SDLC connection or a 4730 device. IMS defines these as SLU 2 and SLU P respectively.

SE3270   MODETAB
IBMS3270 MODEENT LOGMODE=S3270,FMPROF=X'02',TSPROF=X'02',       X
           PRIPROT=X'71',SECPROT=X'40',COMPROT=X'2000'
MT4730   MODEENT LOGMODE=MT4730,FMPROF=X'04',TSPROF=X'04',      X
           PRIPROT=X'B1',SECPROT=X'B1',COMPROT=X'6080',         X
           RUSIZES=X'0000'
         MODEEND

The operator can enter either the VTAM LOGON command or use the VTAM USSTAB command for installation-determined logon syntax.

The following example specifies a KEYWORD=value format:

U3270 USSTAB
      USSCMD     CMD=IMS,REP=LOGON
      USSPARM    PARM=APPLID,DEF=IMS
      USSEND
      END

Logon requirements for the master terminal

Because IMS automatically logs on the master terminal after the IMS START command is issued, you must code the MODETBL keyword on the LU statement for the physical device that is used as the MTO if the VTAM default is not to be used.

When the MTO is using the /OPNDST command, a MODE operand applies to all node names presented in the command.