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Physio Control LIFEPAK 9 - Page 45

Physio Control LIFEPAK 9
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©
August
1993
Physio-Control
Description
1
printhead.
The
printhead
prints
an
array
of
384
bits
from
the
top
to
the
bottom
of
the
recorder
paper.
The
Recorder
Gate
Array
translates
the
two
ECG
signal
data
bytes
from
hexadecimal
code
to
the
320
bits
required
by
the
printhead.
Bytes
for
generating
hexadecimal
characters
are
mapped
to
the
remaining
64
bits
(32
for
the
top,
32
for
the
bottom)
since
text
for
the
recorder
always
appears
at
fixed
locations
at
the
top
or
bottom
of
the
recorder
paper.
As
in
the
Display
Gate
Array,
two
internal
trace
generators
receive
high
and
low
address
inputs
for
the
ECG
trace
and
the
SYNC
marks.
The
thermal
printhead
is
an
array
of
384
switches
and
dots.
An
internal
384-bit
shift
register
(see
Figure
1-10)
receives
data
input
to
the
printhead.
The
Recorder
Gate
Array
sends
clock
pulse
CK
to
the
printhead
which
enters
data
on
the
DI
line
into
the
shift
register
and
converts
the
data
from
serial
to
parallel.
The
CK
pulse
is
active
only
when
data
is
sent
to
the
printhead,
thereby
preventing
the
printhead
shift
register
from
running
continuously.
The
source
of
the
CK
pulses
is
the
E
clock
used
by
the
System
microprocessor
and
the
Display/Recorder
microprocessor.
1
>
»
の
し
Уно
(СОММОМ
©
ELECTRODE)
|
HEATER
|
ELEMENTS
SB
(srrosejo-H[
229
$ $
$
2
|
+
384
BIT
LATCH
ς
| |
|
DI
(DATA
IN)
©
[
|
384
BIT
REGISTER
(
CK
(CLOCK)
©
i
ο
LD
tonjo-H
22ο
о
MAIN
PCB
|
PRINTHEAD
ASSEMBLY
Figure
1-10
Printhead
Assembly
The
Display/Recorder
microprocessor
moves
the
data
stored
in
the
printhead
shift
register
into
the
printhead
latch
via
the
LD
line.
Data
in
the
shift
register
is
loaded
into
a
384-bit
latch
with
a
high
LD
signal
from
the
Display/Recorder
microprocessor.
The
output
of
the
latch
is
gated
by
384
AND
gates;
the
drive
for
the
dot
heating
elements
is
provided
by
384
NPN
transistors.
After
the
data
is
loaded
into
the
latch,
the
Display/Recorder
microprocessor
Strobe
line
switches
one
input
of
the
AND
gates
high.
This
causes
the
gates
switched
high
(data
=1)
on
the
other
input
to
switch
their
All
Rights
Reserved
1-31

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