HP QMS 1660E - Manual (Page 128)

Parallel
Interface Modes
QMS 1660E Print System Reference 5-30
initialization sequences, custom banner pages, print job headers, or
print job trailers. The print server does not necessarily send multiple
print jobs to the printer in the order that you queued them to the
printer. The network job separator is accessed with each print job, so
this ensures that network job separation is enforced. See
QMS
Crown Network Notes for more information on how to create a
network job separator for several commonly used networks.
Parallel Interface Modes
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.
Byte Mode
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:
n Terminate and return to the compatibility mode.
n Stay in the Host Busy, Data Not Available phase.
n Set Host Busy Low, putting the interface into the idle phase.
If there is additional data, the host may do one of the following:
n
Set Host Busy Low, indicating that the host can accept additional
data.
n Stay in the Host Busy, Data Not Available phase.
n Terminate and return to the compatibility mode.
Check your host documentation to see if the host is 1284 compatible.