Logging onto ETO terminals

You can use:

• The IMS /OPNDST command, and optionally include signon data.
• The SNA commands INITSELF, INITOTHER, or USS LOGON, and optionally include user data for signon.
• ETO autologon, which includes user data based on user descriptors or exit routines. The user data is then passed to signon.

If you specify ETO=Y, you can establish sessions with ETO terminals, but only if each of the following is true:

• An available logon descriptor provides sufficient information to create the control blocks necessary to accept the session request.
• In addition to the required logon descriptor, a 3270 or SLU–2 terminal requires an entry in the MFS device characteristics table that matches its screen-size and features. However, IMS does not search the MFS device characteristics table if the 3270 or SLU–2 terminal is identified as model 1 or 2.
• If the screen-size control byte is X'7F' in the PSERVIC field of the VTAM® MODEENT macro, IMS searches the MFS device characteristics table using the alternate screen-size. If no match is found, IMS searches the MFS device characteristics table using the default screen-size. If you specify both sizes, and you want to use the default screen-size, the Logon exit routine (DFSLGNX0) must specify the default screen-size as an override.
• If the user cannot specify the logon descriptor in the user data, you must use the Logon exit routine (DFSLGNX0) or let IMS choose the default logon descriptor based on the terminal type.