IPDS for Control Units
Figure 38. Asynchronous NACK in DSC (Channel-Attached) Mode. Not recommended sequence.
Notes:
1. At the end of this sequence, the printer is no longer in IPDS mode.
2. If the printer generates an Intervention Required (IR) or Equipment
Check (EC) NACK, the (DC) (CE) transmission sent after the
Erase/Write WCC equals Reset command contains the IR or EC status.
Synchronous NACK Sequences in DSC (Channel-Attached) Mode: If the host
application sets the Acknowledge Reply (ARQ) field of the flag byte to 1, the
ACKs or NACKs from the printer are synchronous.
Note: The printer treats Intervention Required (IR) or Equipment Check (EC)
NACKs, returned as a result of ARQ equals 1, as asynchronous NACKs.
In Figure 39 on page 186, the host does not issue a Read Modified after
receiving an Attention from the printer.
Appendix B. Summary of IPDS for Control Units 185
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