Specifications

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In addition to Centronics parallel communication, your printer’s parallel interface pro-
vides IEEE 1284 bidirectional parallel communication, which supports five modes of
operation. The printer automatically recognizes 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 IEEE 1284 compatible.
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Printer-host communication is done in a manner that ensures compatibility.
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