Read Sharp ER-A490 (serv.man4) Service Manual online
2)
Up
-l
o
ad
in
g
mat
ri
x f
or
th
e h
o
s
t
STATE
In
itia
l
Afte
r
s
e
n
d
in
g
I
D
E
N
Q
After
sen
d
in
g
text
EVENT
0
1
2
ENQ
—
—
—
ACK
—
S
e
n
ds
text
an
d
g
o
e
s
t
o
2
.
S
e
n
ds
EOT
an
d
g
o
e
s
t
o
3
.
NAK
—
—
Resen
ds the
text an
d
t
h
e
n
g
o
es to 2
.
If the
h
o
s
t
h
as resen
t t
h
e
text two ti
m
e
s
,
it
g
o
es to 0
.
(ERROR END)
EOT
—
—
T
h
e
h
ost go
es to 0
.
(ERROR END)
TEXT
—
—
—
T
IME-UP
—
Resen
ds
ID
ENQ
a
n
d
t
h
e
n
g
o
e
s
t
o
1
.
If the
h
o
s
t
h
as resen
t ID ENQ
two
t
im
es, it g
o
e
s
t
o
0
.
(ERRO
R END)
Resen
ds the
text an
d
t
h
e
n
g
o
es to 2
.
If the
h
o
s
t
h
as resen
t t
h
e
text two ti
m
e
s
,
it
g
o
es to 0
.
(ERROR END)
KEY ENTRY
S
e
n
d
s
ID ENQ an
d
g
o
e
s
t
o
1
.
—
—
T
im
e
-u
p
:
O
n
e
secon
d
a
fter sen
d
in
g
of ID ENQ.
F
o
u
r
s
e
c
o
n
d
s
a
fter sen
d
in
g
of te
x
t.
STATE
After
sen
d
in
g
EOT
Afte
r
s
e
n
d
in
g
ACK
Afte
r
s
e
n
d
in
g
NAK
EVENT
3
4
5
ENQ
S
e
n
d
s
ACK
a
n
d
g
o
es
to
4
.
After
th
e
h
o
s
t
h
a
s
r
e
c
e
iv
e
d
ENQ,
re
s
e
n
d
s
ACK
a
n
d
g
o
e
s
t
o
4.
After th
e
h
ost ha
s
re
c
e
iv
e
d
T
EXT, ig
n
o
res the
E
N
Q
.
—
ACK
—
—
—
NAK
—
—
—
EOT
T
h
e
h
ost go
es to 0
(ERROR END)
After th
e
h
ost ha
s
re
c
e
iv
e
d
T
EXT, go
es to 0
.
(Norm
a
l e
n
d)
After th
e
h
ost ha
s
re
c
e
iv
e
d
ENQ, g
o
e
s
t
o
0.(ERROR END)
T
h
e
h
ost go
es to 0
.
(ERROR END)
TEXT
—
T
h
e
h
ost che
c
k
s
t
h
e
t
e
x
t b
lo
c
k, i
f t
h
e
b
lo
c
k
is corre
c
t,
t
h
e
h
o
s
t sen
ds ACK an
d
g
o
e
s
t
o
4
.
If it is no
t
c
o
rrect, the
h
o
s
t sen
ds NAK an
d
g
o
e
s
t
o
5
.
If tran
sm
is
s
io
n
c
a
n
n
o
t b
e
co
ntin
u
e
d, t
h
e
h
o
st s
e
n
d
s
E
O
T
a
n
d g
o
e
s
to
0.
T
h
e
h
ost c
h
e
c
k
s
t
h
e
c
h
e
c
k
s
t
h
e
text b
lo
c
k, i
f t
h
e
b
lo
c
k
i
s
c
o
rrect, the
h
o
s
t sen
ds ACK an
d
g
o
e
s
t
o
4
.
If it is no
t
c
o
rrect, the
h
o
s
t sen
ds NAK an
d
g
o
e
s
t
o
5
.
If tran
s
m
is
s
io
n
c
a
n
n
o
t b
e
c
o
n
ti
n
u
e
d
,
th
e
h
ost
sen
ds E
O
T
a
n
d g
o
e
s
to
0.
(ERROR END)
T
IME-UP
Re
s
e
n
d
s
EOT a
n
d
g
o
es to 3
.
If th
e
h
ost ha
s
re
s
e
nt th
e EOT two
t
im
es, it go
es to 0
.
(ERROR END)
The
ho
st g
o
e
s
to
0.
(ERRO
R END)
Tim
e-u
p i
s
7
s
e
co
n
d
s
T
h
e
h
ost go
es to 0
.
(ERROR END)
Tim
e
-up
i
s
7
s
e
co
n
d
s
KEY ENTRY
—
—
—
T
im
e
-u
p
:
Two secon
d
a
fter sen
d
in
g
of EOT.
1 – 10
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