IPDS for Control Units
5. If an Intervention Required (IR) or Equipment Check (EC) NACK occurs, the
printer returns an IR or EC response to the host. Otherwise, the printer
returns a normal response.
Figure 36. Reporting IPDS Errors with ACK Reply Structured Field in DSC Mode
Recommended NACK Sequence for Printers in DSC Mode
(Channel-Attached)
1. The host application receives an Attention from the printer notifying the
application that inbound data is available. The NACK structured field is sent
inbound with the Persist bit active in the flag byte.
2. Any further IPDS data received is ignored by the printer until Step 3 is
completed.
3. A valid IPDS command is received with a length less than 256 with the ARQ
flag active. The NACK structured field is sent a final time, without the Persist
flag bit active. The NACK reply sequence is now complete.
The printer remains in IPDS mode with IPDS in Home state.
4. If the NACK was due to a printer IR or EC error, the printer returns an IR or
EC status response on the next 3270 command.
182 6400 IPDS
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