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15.7 Input
and
Output Signals
(1) DATA
1
-
8
(a) These signals are
input
signals to
receive the
1st to the 8th
bit
of
information,
respectively.
(b) Each signal
is
at a
high
level
when data is logic
"1",
(e)
Pulse
width
should
be 3.usec min.
(2) DATA STROBE (DATA·STB)
(a) This signal is a synchronizing input signal to
read each of
DATA 1
-- 8.
(b) This signal is
normally high; data is
read when
the signal
level
changes to
low.
(e) Pulse width should
be
Ipsec
min.
(3) INPUT·
PRIME
(a) This signal is an
input
signal to
place the
printer in the selected or
deselected
state, as
well as to
initialize
the entire electronic control
circuitry of the
printer
except the
VFU.
(The VFU
will
remain
preset
even
if
this signal
is
input.)
(b)
tr
the fitN"' P OlOT""' . "P"R"IM""E' " signal
is input while data
are
being
stored
in
the
burrer, the
entire
control circuitry of the
printer
except the
VFU
are
initialized
after
all
the
data in
the
buffer
have
been
printed.
(c)
Pulse width should
be
11-'
sec
min.
(4) ACKNOWLEDGE (ACK)
(a)
This
signal
is
an output signal
which indicates
that
each operation specified
by the
received
data
code
has been
completed, and that
the
printer is ready
to
receive the next data
code.
This signal
is
therefore regarded as a
data
request
pulse. (Note
however,
that
the ACK
signal
is
output when the printer changes
from
-{)5-
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