IPDS for Control Units
Note: At the end of this sequence, the printer is no longer in IPDS mode nor
does the host read the ACK/NACK.
In Figure 34 the host sends an End Bracket with no EDS. The host issues no
Change Direction.
Figure 34. Synchronous NACK in LU-1 Mode. End Bracket issued after Signal.
Note: At the end of this sequence, the printer is no longer in IPDS mode nor
does the host read the ACK/NACK.
IPDS Application in DSC Mode
An application program can switch the printer from 3270 to IPDS during a DSC
session. The IPDS data stream is carried in the IPDS structured fields and is
processed entirely by the printer. This differs from the 3270 data stream that
processes the data in the control unit before sending the data to the printer.
Determining IPDS Capability
An application can determine the IPDS and data chain capability of a printer
operating in DSC mode by issuing a Read Partition query or a Read Partition
Query List structured field. The query list, if used, should contain a Q code of
X
'9A' (3270 IPDS) and a Q code of X'98' (data chaining).
The printer returns a 3270 IPDS query reply and a data chaining query reply.
In DSC mode, all outbound data streams containing structured fields are sent
using the Write Structured Field (WSF) command. All inbound data streams
containing structured fields begin with the AID code of X
'88'.
178 6400 IPDS
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