Sharp ER-A490 (serv.man4) Service Manual ▷ View online
4) Up
-l
o
ad
in
g
mat
ri
x
fo
r t
h
e
satel
li
te
STATE
In
itia
l
Afte
r
receivin
g
ID-ENQ
an
d
sen
d
in
g
ACK.
Afte
r s
e
n
d
in
g
NAK
EVENT
0
1
2
ID-ENQ
Sa
tell
ite
c
h
e
c
k
s
the
t
e
rmi
n
a
l No.:If i
t i
s
corre
c
t,
sate
lli
te
sen
ds ACK an
d
g
o
e
s
t
o
1
.
If it i
s
n
ot corre
c
t, sate
llite
i
g
n
o
res the
ID-ENQ
.
Sate
llite
che
c
k
s
t
h
e
t
e
rm
in
a
l No
.:If it i
s
c
o
rrect, s
a
tell
it
e
s
e
n
d
s
ACK a
n
d
g
o
es to 1
.
If
i
t i
s
n
o
t
c
o
rrect,
s
a
tell
ite i
g
n
ore
s th
e
ID-ENQ.
—
ACK
—
—
—
NAK
—
—
—
EOT
—
—
Sate
lli
te g
o
e
s
to
0.
(ERROR END)
TEXT
—
Sate
llite
che
c
k
s
t
h
e
te
x
t b
lo
c
k
, if
th
e
b
lo
c
k
i
s
corre
c
t, s
a
tell
it
e
s
e
n
d
s
ACK a
n
d
g
o
es to 3
.
If it is no
t
c
o
rrect, Sate
llite
s
e
n
d
s
NAK a
n
d
g
o
es to 2
.
If
tra
nsm
is
sio
n
c
a
n
n
ot b
e
c
o
n
ti
n
u
e
d
,
sate
llite
sen
d
s
E
O
T
a
n
d g
o
e
s
to
0.
(ERRO
R END)
Sate
lli
te c
h
e
c
k
s
t
h
e
t
e
x
t b
lock
, i
f
th
e
b
lock
is c
o
rrect,
Sate
lli
te sen
ds ACK an
d
g
o
e
s
to
3.
If it is no
t
c
o
rrect, Sate
lli
te sen
ds NAK an
d
g
o
e
s
t
o
2
.
If tran
s
m
is
s
io
n
can
n
o
t
b
e
con
tinu
e
d
,
sate
lli
te s
e
n
d
s
E
O
T
a
n
d g
o
e
s
to
0.
(ERROR END)
T
IME-UP
—
Sate
llite
go
es to 0
.
(ERRO
R END)
Tim
e-u
p i
s
7
s
e
co
n
d
s
Sate
lli
te g
o
e
s
to
0.
(ERROR END)
Tim
e
-up
i
s
7
s
e
co
n
d
s
STATE
After re
c
e
iv
in
g
text an
d sen
d
in
g ACK
Afte
r
s
e
n
d
in
g
E
N
Q
Afte
r
s
e
n
d
in
g
TEXT
EVENT
3
4
5
ID-ENQ
—
—
—
ACK
—
Sate
llite
s
e
n
d
s
th
e te
x
t a
n
d
go
es
to
5
.
Sate
lli
te
sen
ds
th
e te
x
t
a
n
d g
o
e
s
to 5
, o
r
s
e
n
d
s
th
e
EOT
a
n
d
g
o
es to 0
.
(Norm
a
l END)
NAK
—
—
Resen
ds the
text an
d
t
h
e
n
g
o
es to 5
.
If sa
tel
lite
h
a
s re
se
nt th
e te
xt t
w
o
ti
m
e
s, s
e
n
d
s
EOT
a
n
d
g
o
es to 0
.
(ERROR END)
EOT
Sa
tell
ite sen
ds
ENQ
an
d
g
o
e
s
to
4.
Resen
ds
the
E
N
Q
a
n
d
the
n
g
o
e
s
to
4.
If Sa
tell
ite
h
a
s
resen
t t
h
e
ENQ
tw
o
t
im
e
s
,
s
e
n
d
s
E
O
T
a
n
d
g
o
es to 0
.
(ERRO
R END)
Sate
lli
te g
o
e
s
to
0.
(ERROR END)
TEXT
Sa
tell
ite c
h
e
c
k
s
t
h
e
text
b
lo
c
k,
if the
b
lo
c
k
i
s
corre
c
t, sate
lli
te
sen
ds ACK an
d
g
o
e
s
t
o
3
.
If it i
s
n
ot corre
c
t, sate
llite
s
e
n
d
s
NAK a
n
d
g
o
es to 2
.
If tran
sm
is
s
io
n
c
a
n
n
o
t b
e
c
o
n
tin
u
e
d, sa
tel
lite
s
e
n
d
s
E
O
T
a
n
d
g
o
es to 0
.
(ERROR END)
——
T
IM
E-UP
T
h
e
h
ost go
es to 0
.
(ERROR END)
T
im
e
-u
p
is 7 secon
d
s
Resen
ds
the
ENQ
a
n
d
t
h
e
n
g
o
e
s
t
o
4
.
If
sate
lli
te
h
a
s
r
e
s
e
n
t t
h
e
E
N
Q
two t
im
e
s
, s
e
n
d
s
EOT a
n
d
g
o
es to 0
.
(ERRO
R END)
Resen
ds the
text an
d
t
h
e
n
g
o
es to 5
.
If sa
tel
lite
h
a
s re
se
nt th
e te
xt t
w
o
ti
m
e
s, s
e
n
d
s
EOT
a
n
d
g
o
es to 0
.
(ERROR END)
T
im
e
-up
:
F
o
u
r
s
e
c
o
n
d
s
a
fter sen
d
in
g
of te
x
t.
Two secon
d
a
fter sen
d
in
g
of ENQ.
1 – 12
CHAPTER 7. CONTROL SIGNAL SEQUENCE
1. Online transmission
1) Half duplex transmission
2) Full duplex transmission
*Note: In the direct connect mode, same as full duplex control, but
the CI signal is not controlled.
3) Line connection sequence flow
DATA
SD
DTE
DCE
DATA
RD
RTS
CTS
DSR
DCD
DTR
CI
< 100ms
< 500ms
DATA
SD
DTE
DCE
DATA
RD
RTS
CTS
DSR
DCD
DTR
CI
< 100ms
< 500ms
*
STARTED BY P.C
INITIAL
CI SENSE ?
CI ON ?
DTR ON
DSR ON ?
FULL DUPLEX ?
RTS ON
LINE ESTABLISHED
NO
NO
NO
NO
NO
NO
YES
YES
CI SENSE ?
TIME OUT ?
YES
YES
YES
Note : The CI signal can be changed over when
so set in the PGM mode, and effective
at ECR side.
so set in the PGM mode, and effective
at ECR side.
30sec
ERROR : NO LINE
DTR OFF
1 – 13
4) Transmission sequence flow
LINE ESTABLISHED
FULL DUPLEX ?
DCD OFF ?
TIME OUT ?
RTS ON
DSR ON ?
FULL DUPLEX ?
DCD ON ?
CTS ON ?
TIME OUT ?
TIME OUT ?
YES
YES
YES
NO
NO
5 sec
YES
YES
YES
YES
YES
NO
30 sec
NO
YES
7 sec (Programmable)
TXRDY ?
SEND 1 CHARACTER
MORE TO
SEND ?
SEND ?
FULL DUPLEX ?
WAIT 100ms
FULL
DUPLEX ?
DUPLEX ?
RTS OFF
LINE ESTABLISHED
TRANSMIT ERROR
NO
YES
YES
YES
YES
LINE ESTABLISHED
RTS OFF
DTR OFF
RTS OFF
RTS OFF
1 – 14
5) Receiving sequence flow
LINE ESTABLISHED
DSR ON ?
DCD ON ?
RXRDY ?
READ 1 CHARACTER
EOT ?
ENQ ?
ACK ?
HALF
DUPLEX ?
TIME OUT ?
TIME OUT ?
SEND TEXT
LINE ESTABLISHED
RECEIVE ERROR
AFTER
RECEIVE
ER-OFF
COMMAND
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
NO
YES
YES
YES
YES
ID. ENQ
∞
ACK or
NAK 4 sec
TEXT 7 sec
NAK 4 sec
TEXT 7 sec
END CODE
NAK ?
BUFFER FULL ?
LINE ESTABLISHED
DTR OFF
RTS OFF
RTS OFF
DSR OFF
INITIAL
YES
YES
YES
YES
YES
NO
30sec
DTR OFF
RTS OFF
RTS OFF
1 – 15
Click on the first or last page to see other ER-A490 (serv.man4) service manuals if exist.