User`s guide

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Direct Access Self-Defining Parameter
The presence of the Direct Access ID self defining parameter indicates the auxiliary device may be
accessed directly by using the destination/origin structured field.
Table D-17. DIA Auxiliary Device Direct Access SDP
Offset Length Content Meaning
0 1 byte 0x04 Parameter Length
1 1 byte 0x01 Direct Access ID
2-3 2 bytes DOID Destination/Origin ID
DOID: The value in these bytes is used in the ID field of the destination/origin structured field to
identify the auxiliary device as the destination or origin of the data which follows.
See the IBM 3270 Information Display System Data Stream Programmer's Reference for the field
definitions for this query reply.