1. OUTLINE EO10-33016A
1.5 Electronics Specifications
1-11
HostBusy Input
z Reverse data transfer phase:
It indicates that the host can receive data
from the printer by setting the signal to low.
Then, the host sets the signal to high, and
sends the Ack indicating that the nibble data
is received. When the signal is set to low
rse channel data transfer is
performed, the interface phase changes to
the idle phase. At that time, there is no
available data on the printer.
z Reverse idle phase:
When this signal is set to high according to
the low pulse of the PtrClk signal, the host
enters the reverse data transfer phase
again. If this signal is set to high when the
IEEE1284 Active signal is low, the
IEEE1284 idle phase stops, and the
interface enters the Compatibility mode.
nDataAvail Output
z Reverse data transfer phase: When the signal is low, it indicates the
printer has data to be sent to the host. And
it is used for sending data bits 0 and 4.
z Reverse idle phase: It is used for indicating that the data is
available.
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