Structured Field Descriptions; Lu-1 (Sna) Structured Fields; Synchronous Ack/Nack In Dsc (Bsc-Attached) Mode - IBM 6400 Programmer's Reference Manual
Line matrix printers, intelligent printer data stream
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- Programmer's reference manual (450 pages) ,
- Maintenance manual (428 pages) ,
- Maintenance information manual (422 pages)
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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:
190
6400 IPDS
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
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