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The parameter list contains the following information:
1. A standard header. Byte 1 indicates the request type (this is hexadecimal
character X'FD' for INSTALL), and bytes 2 to 3 contain the component code,
which is always ZC for consoles. (Byte 4 is reserved.)
2. A pointer to a 2-byte length field, followed by the console name of the console
which sent the message.
3. A pointer to an array of names of eligible autoinstall models. The array is
preceded by a 2-byte field containing the number of 8-byte name elements in
the array. If there are no elements in the array, the number field is set to zero.
4. A pointer to the area of storage that you use to return information to CICS.
CICS passes a list of eligible autoinstall models in the area addressed by fullword 3
of the parameter list. From this list, the control program must select a model that is
suitable for the console device, and move the model name to the first 8 bytes of the
area addressed by fullword 4 of the parameter list. Before returning to CICS, the
control program must supply a CICS 4-character terminal ID for the console being
logged on, and set the return code field to X'00' if the autoinstall request is to be
allowed. Your program can also set the delay period that is to follow the last use of
a console before it is automatically deleted by CICS. On entry to your autoinstall
control program, this value is set to a default value of 60 minutes. Override this by
storing your own delay period, in minutes, as a fullword binary value. Setting this
field to zero (0) means that CICS never deletes the console.
Figure 45 on page 538 shows all of these fields in their required order.
Fullword 1 Standard Header
Byte 1 Function Code (X’FD’ for INSTALL)
Bytes2-3 Component Code Always ’ZC’
Byte 4 Reserved Always X’00’
Fullword 2 Pointer to CONSOLENAME_FIELD
Fullword 3 Pointer to MODELNAME_LIST
Fullword 4 Pointer to SELECTED_PARMS
Fullword 5 Reserved
Figure 44. Autoinstall control program’s communication area at INSTALL for consoles
Chapter 11. Writing a program to control autoinstall of consoles 537