Optional Parameters
All parameters shown in the base part of the query reply must be present. Parameters not used are set to X'00'.
At least one self-defining parameter must be present.
| Offset | Length | Content | Meaning |
|---|---|---|---|
| 0–1 | 1 word | Length | Length of structure (includes self-defining parameters) |
| 2 | 1 byte | X'81' | Query reply ID |
| 3 | 1 byte | X'9E' | IBM auxiliary device reply |
| 4 | 1 byte |
FLAGS |
Reserved |
| 5 | 1 byte | FLAGS | Reserved |
| 6–7 | 2 bytes | LIMIN | Maximum DDM bytes allowed in inbound transmission |
| 8–9 | 2 bytes | LIMOUT | Maximum DDM bytes allowed in outbound transmission |
| 10 | 1 byte | TYPE |
Type of auxiliary device supported |
| 11 | 1 byte | X'04' | Parameter length |
| 12 | 1 byte | X'01' | Direct access |
| 13–14 | 1 word | DOID | Destination/origin ID assigned by the subsystem |
| QUERY | This bit must be set to B'1'
for all IBM auxiliary devices to indicate that it supports receiving
a Read Partition (Query, Query List). The host applications can then
use a Read Partition directed to the auxiliary device to determine
its characteristics. The destination/origin structured field is used
to direct the Read Partition structured field to the auxiliary device.
The minimum support level for the IBM auxiliary device is to return the Null query reply in response to the Read Partition. |
| LIMIN | States the maximum number of bytes that can be sent in an inbound transmission. A LIMIN value of X'0000' indicates no implementation limit on the number of bytes transmitted inbound. |
| LIMOUT | States the maximum number of bytes that can be sent to an IBM auxiliary device in an outbound transmission. A LIMOUT value of X'0000' indicates no implementation limit on the number of bytes transmitted outbound. |
| TYPE | Identifies the auxiliary device being supported. Two values are valid. One identifies an auxiliary display and the other identifies an auxiliary printer. All other values are reserved. |
The IBM auxiliary device processor supports two self-defining parameters, 01 and 03. These are defined in Table 1.