Service manual
MZ-1E02
4. POSITIVE LOGIC
AND
NEGATIVE
LOmC
This
I/O
interlace
"can
be
set
for positive logic
or
negative
"logic, independently
f~r
input data,
output
data,
input
can-
...
~r<?'
~ig!lal~,
and
output
c9ntro] signals. The logical mode
,ot;QJltput,R()ntrol sigrais
js
set
by,the
DIP
swjt~h
on
the
int~rfac~
PC
bo~rd
and
the
logical
mode
of
other
signais
is
,~et
l!sing a command_word (GSET
commanc;lJ.
For
further
.
details,'
see
Pllrt
VU,.
Prograrnmin~I'rp.,
1-5 and Appendix
4~
Setup
of
the DIP switch;
p.
A-5.
4;' iNP "
PUTPrNS
1.
'
INpurPiNS'"
Th.is','jjo'
j'nteriace ;has\(] 2
inpu"t
pins, eight
for
data
and
four
for
control
.signals.
'th'e
12
iripu"t pins correspond
to
signals
11
through
112.
Signals
11
to
18
are data signals and
19
to
112 are control
signals. These signals have
the
follQvying
magnitudes
, (weighrs
),:
.
1 i
l1i','
I!~
,
...
:.
. .
..
2°
,J,I~J10
2'
.3.13,111
.......
2'
4:
14,112,"
......
2'
5.,
15
...........
24
6.
16
...........
2'
7.
i7
...........
2'
8.
18
...........
27
or
used as a parity
bit
or
not
used.
2. OUTPUT
PI
NS
This)/O
iriterface has 12
output
pins, eight for
data
and
fbL\r
f~r'i:::0l1trol
signals.
'The-
12_
ou'tput pins correspond
to
signals
01
through
012.
These signals have
the
following magnitudes (weights):
1.
01,09
.......
2'
2.
02,010
......
2'
3.
03,011
......
2'
4.
04,012
......
2'
5.
05
..........
24
6.
06
..........
2'
7.
07
..........
2'
8.
08
..........
27
or
used as a parity
bit
or
not
used.
After power has been switched on, signals
01
to
08
are
ON
(high level)
and
signals
09
to
012
may
be
ON
(high level)
or
OFF
(Iow level) as set by
the
DIP
switch
on
the
inter-
face
PC
board.
For
further
details, see Appendix
4,
Setup
of
the DIP switch, p.
A-5.
3.
ELECTRICAL
CHARACTERISTICS OF INPUT/OUTPUT
PINS
1)
Output
signals
ON
(high) : > 2.4 V 0.25
mA
OFF (Iow) :
<0.5
V 48
mA
2)
Input
signals
ON
(high) : 2.0 - 5.25 V
OFF (Iow) :
-0.5
- 0.5 V
Maximum input
voltage:
5.25
V
2
5. SIGNAL TIMING
IN
AUTOMATIC
HANDSHAKING MODE
1.
SIGNAL
TIMING FOR
DATA
INPUT
For
data input
in
the
automatic handshaking mode, signal
lines
11
to
18
are used 'for
input
data,
1.10
is
used: f'or
th~
~.TRO_~E
signal
in
data
input
and 01_0.
is
-u~ed
for the.
ACKNOWLEDGE signal which indiCates
thatt'he
interlace
unit
(MZ-1 E02)
has
received data.
J~~.!~!!oyvin
!1,I_u~t'~~~es
t~~_t!
J, 9
s.iQ.Qal.s
_9_S~"rIJing
that
signals'
on
liries
110
and
010
are
in
a positive logic
s'istem~
Data signa!s
---y-------,r---
11
to
18
~-+I\+,,---_:;_'-T"-4J\.,--~
T must
be
at
feast
STROBE
signal 110
ACKNOWLEDGE
78-.0.uS
in
dUration.
signal
01
0
--~=-=:::f~-
95.0
,uS
to
170.0j,lS
The ACKNOWLEDGE signal on signal line
010
can
be
replaced with the READY, REQUEST TO SEND (trans,
mission request)
or
the
BUSY
signal.
2.
SIGNAL TIMING
FOR
DATA
OUTPUT
For data
output
in
the
automatic handshaking mode, signal
lines
01
to
08
are used for
output
data,
09
is
used for
the
STROBE
signal
and
19
is
used
for
the ACKNOWLEDGE
signal which indicates
that
the
peripheral
unit
has received
data. The following Hlustrates
the
timing
of
signals, assum-
ing
that
signals on lines
09
and
19
are
in
a negative logrc
system.
Data signals
01
to
08
_
__
~=t=+~~17~,O~"~S~'~5~%~,,
____
__
STROBE
signal
09
ACKNOWLEDGE
signal
19
If
T1
is
less than 3.5
tLS,
Tl
+
T2
must
be
at
least
3.5
.uS;
if
T1
is
equal
to
or
more
than
3.5
.uS,
T2
must
be
at
least
78.0
p.S.
The ACKNOWLEDGE signal
on
line
19
can be replaced
with
the READY, REQUEST TO SEND (transmission
request)
or
the
BUSY
signal.
As
described above
in
aautomatic handshaking, signal lines
11
to
18
are used for data input and
110
and
010
are used
for
control signals during
data
input. Signal lines
01
'to
08
are used for data
output
and
09
and
19
are used for control
signals. Input lines
111
and
112
and
output
lines
011
and
012
are not used
in
the
automatic handshaking mode and
these
lines can be used arbitrarily.
The
following shows
some examples
of
signals
to
be transmitted on these four
lines. Also refer
to
the
GBIT command,
p.30.
Signal line ExamplE!,of signal
ERROR
Signal,
WARNING
si'grial,
PAPER
11T,''i'l2'
END signal,
ALARM
signal, FAU LT signal,
WAIT signal, etc.
MACHINE SELECT
Signal,
REMOTE
POW,
011,
012
ER-ON
signal,
INITIAL. RESET
signal,
FAULT
RESET signal, etc.
Note:
If
data
input
or
output
does
not
operate satis-
factorily
in
the
automatic handshaking mode and
the
system hangs
up
in
the
wait
stat~
(e.g.,
the
sys-
tem waits for
the
STROBE signal
in
data
input
or
the ACKNOWLEDGE signal in data output), the
system can be released from this state by pressing
the
HALT
button.