IPDS for Control Units
Figure 37. Asynchronous NACK in DSC (Channel-Attached) Mode. Recommended sequence.
Notes:
1. At the end of this sequence, the printer remains in IPDS mode if no
End-of-Chain structured field has been received.
2. Zero or more WSF with IPDS data sequences may occur before the WSF with
IPDS + ARQ flag is sent. Data is ignored and ATTENTION is repeated on
these transmissions. The Read Modify occurs after the last command.
3. If the printer generates an Intervention Required (IR) or Equipment Check
(EC) NACK, the (CE) (DE) transmission sent after the WSF n+2 command
contains the IR or EC status.
Appendix B. Summary of IPDS for Control Units 183
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