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Operating Principles
Parallel Interface Circuit
2.2.1.5
Figure 2-41 shows the parallel interface circuit block diagram. Data sent from the host
latched within the
automatically to stop the host computer from sending additional data. The CPU
signal after reading the data from the
the host computer.
2.2.1.6
Circuit
This circuit uses the
signal level (-12
signal level to the
The
standard cell changes serial
Parallel Data
-.................. ------"--"-b
2-28
signal.
by the STROBE
so that the printer is ready to receive more data from
——————b
Figure 2-41. Parallel Interface Circuit
receiver/driver
or
to the
signal level.
converts +5
data to parallel data.
Transmit
Figure 2-42.
The
outputs the
Latch
1-" "-:
to change the signal level
signal level (O V or +5 V) or from the
to +12
serial
Data
MA)(2O2
Circuit
is
BUSY signal
resets the
BUSY
the
and –12
Rev.
.-., ..,
.
-'
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