Direct Access Self-Defining Parameter
The direct access self-defining parameter provides the ID for use in the destination/origin structured field in the direct access of the IBM auxiliary device.
This SDP is always required to accompany the base query reply.
| Offset | Length | Content | Meaning |
|---|---|---|---|
| 0 | 1 byte | X'04' | Parameter length |
| 1 | 1 byte | X'01' | 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 that follows.