VTAM® uses unformatted
system services (USS) tables to:
- Issue messages to the VTAM operator
console or a program operator application
- Process VTAM operator commands
- Issue messages to a terminal operator user
- Process commands received from a terminal operator user
VTAM uses two types
of USS tables to define messages and commands:
- Session-level table
- Contains:
- Definitions for terminal user commands (such as LOGON) that can
be received from a terminal.
- Messages that VTAM sends
to a terminal.
- A
translation table that is used for character-coded input from the
terminal.
See Session-level USS table (ISTINCDT) for an example of
a session-level USS table.
- Operation-level table
- Contains USS commands (such as DISPLAY ROUTE)
that can be received from the VTAM operator
or a program operator application and messages issued in response
to those commands. See Operation-level USS table (ISTINCNO) for
an example of an operation-level USS table.
IBM® supplies default
USS tables with the VTAM product.
The source language
for these tables is contained in SYS1.ASAMPLIB. Table 1 describes
the default tables.
Table 1. Description of the
IBM-supplied USS tables| Table name |
Description |
|---|
| ISTINCDT |
Default session-level USS table used
by terminal operator users. Contains the following
items: - The following terminal operator commands:
- USSMSGxx (where xx equals 1–9 and 11–14) that are
sent to a terminal operator. See z/OS Communications Server: SNA Messages for
detailed descriptions of USS messages.
- Translation table that is used for character-coded input from
the terminal. The translation table,
named STDTRANS, converts lowercase characters to uppercase and converts
horizontal tabs to spaces.
|
| ISTINCNO |
Default operation-level USS table
used by the VTAM operator (commands
and messages) and program operator applications (commands). Contains
the following items:
|
| ISTCFCMM |
Default operation-level USS table
for a program operator application containing operation-level VTAM messages. |