IPDS for Control Units
Figure 42. Synchronous ACK/NACK in DSC (BSC-Attached) Mode
Note: At the end of this sequence, the printer does not send the ACK/NACK to
the host, and the ACK/NACK is lost.
Structured Field Descriptions
IPDS requirements include additional structured fields, as well as changes to
existing fields. The following pages describe these structured fields.
LU-1 (SNA) Structured Fields
IPDS in the LU-1 environment requires the definition of a data stream identifier
for the query reply data streams structured field. This field has the following
format:
Byte Value Description
0-1 0006 Length
2 81 Type=Query Reply
3 A2 Data Streams Indicator
4-5 0002 List of Data Stream Identifiers
190 6400 IPDS
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