Read Sharp ER-A490 (serv.man4) Service Manual online
2) Data transmission from satellite to the host
ACK
EOT
( 1 ) Inquines of the satellite.
( 4 ) Receives ACK.
( 5 ) Sends the text.block.
( 7 ) Resends the text block if NAK is received.
Resends the text block up to two times.
Sends EOT and terminates the operation
with error if NAK is still received after the
second resending of text block.
Resends the text block up to two times.
Sends EOT and terminates the operation
with error if NAK is still received after the
second resending of text block.
( 9 ) Sends the next text if ACK is received and
sends EOT and waits for ENQ.
sends EOT and waits for ENQ.
( 2 ) Receives ENQ.
Checks the terminal No.
to see if it is its own.
Checks the terminal No.
to see if it is its own.
( 3 ) Sends ACK.
( 6 ) Receives text.
Checks the check sum,text
data,etc. And goes to (8)
if there is no error in them.
Checks the check sum,text
data,etc. And goes to (8)
if there is no error in them.
( 8 ) Sends ACK.
( 10 ) Terminates the operation if EOT
is received.
is received.
ENQ
Host
Satellite
Dummy
(3bytes)
(3bytes)
Terminal No.
(6bytes)
(6bytes)
Start code
Text (parameter)
End code
Text (DATA)
NAK
ACK
( 8 )' Sends NAK if any error
occurs.
occurs.
ENQ
ACK
Continued on the
next page
next page
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