Sharp XE-A201 Service Manual page 6

XE-A201UC
2) Up-loading matrix for the host
STATE
EVENT
ENQ
ACK
NAK
EOT
TEXT
TIME-UP
KEY ENTRY Sends ID ENQ and goes to 1.
Time-up: One second after sending of ID ENQ.
Four seconds after sending of text.
STATE After sending EOT
EVENT
Sends ACK and goes to 4.
ENQ
ACK
NAK
The host goes to 0.
(ERROR END)
EOT
TEXT
Resends EOT and goes to 3.
If the host has resent the EOT two times, it
TIME-UP
goes to 0.
(ERROR END)
KEY ENTRY
Time-up: Two second after sending of EOT.
3) Down-loading matrix for the satellite
STATE
EVENT
Satellite checks the terminal No.:If it is cor-
rect, satellite sends ACK and goes to 1.
ID-ENQ
If is not correct, Satellite ignores the ID-
ENQ.
ACK
NAK
EOT
TEXT
TIME-UP
Initial
0
.
.
Sends text and goes to 2.
.
.
.
Resends ID ENQ and then goes to 1.
If the host has resent ID ENQ two timesit
.
goes to 0.
(ERROR END)
3
After the host has received ENQ, resends
ACK and goes to 4.
After the host has received TEXT, ignores
the ENQ.
.
.
After the host has received TEXT, goes to 0.
(Normal end)
After the host has received ENQ, goes to 0.
(ERROR END)
The host checks the text block, if the block is
correct, the host sends ACK and goes to 4.
If is not correct, the host sends NAK and
.
goes to 5.
If transmission cannot be continued, the host
sends EOT and goes to 0.
The host goes to 0.
(ERROR END)
Time-up is 7 seconds
.
Initial
0
Satellite checks the terminal No.:If it is cor-
rect, satellite sends ACK and goes to 1.
If it is not correct, Satellite ignores the ID-
ENQ.
.
.
After satellite has received TEXT, goes to 0.
(Normal end)
.
Before satellite has received TEXT, ignores
the EOT
Satellite checks the text block, if the block is
correct, Satellite sends ACK and goes to 1.
If it is not correct, satellite sends NAK and
.
goes to 2.
If transmission cannot be continued, satel-
lite sends EOT and goes to 0.
(ERROR END)
Satellite sends EOT, and goes to 0.
.
(ERROR END)
Time-up is 7 seconds
After sending ID ENQ
1
.
.
.
.
.
After sending ACK
4
.
.
.
After sending ACK
1
.
.
– 5 –
After sending text
2
.
Sends EOT and goes to 3.
Resends the text and then goes to 2.
If the host has resent the text two times, it
goes to 0.
(ERROR END)
The host goes to 0.
(ERROR END)
.
Resends the text and then goes to 2.
If the host has resent the text two times, it
goes to 0.
(ERROR END)
.
After sending NAK
5
.
.
.
The host goes to 0.
(ERROR END)
The host checks the text block, if the block is
correct, the host sends ACK and goes to 4.
If is not correct, the host sends NAK and
goes to 5.
If transmission cannot be continued, the host
sends EOT and goes to 0.
(ERROR END)
The host goes to 0.
(ERROR END)
Time-up is 7 seconds
.
After sending NAK
2
.
.
.
Satellite goes to 0.
(ERROR END)
Satellite checks the text block, if the block is
correct, Satellite sends ACK and goes to 1.
If it is not correct, satellite sends NAK and
goes to 2.
If transmission cannot be continued, satel-
lite sends EOT and goes to 0.
(ERROR END)
The host goes to 0.
(ERROR END)
Time-up is 7 seconds