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In addition to Centronics parallel communication, your printer’s paral-
lel interface provides IEEE 1284 bidirectional parallel communication,
which supports five modes of operation. The printer automatically rec-
ognizes and uses the mode dictated by the host.
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Printer-host communication is done in bytes.The byte mode may be
used by the host device in a DMA (Direct Memory Access) mode for
more efficient operation.
When byte transfer is complete and there is no more data to transmit,
the host may do one of the following:
„
Terminate and return to the compatibility mode.
„
Stay in the Host Busy, Data Not Available phase.
„
Set Host Busy Low, putting the interface into the idle phase.
If there is additional data, the host may do one of the following:
„
Set Host Busy Low, indicating that the host can accept additional
data.
„
Stay in the Host Busy, Data Not Available phase.
„
Terminate and return to the compatibility mode.
Check your host documentation to see if the host is 1284 compatible.
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Printer-host communication is done in a manner that ensures com-
patibility.