Sharp XE-A201 - Page 4

XE-A201UC
– 3 –
2) Data transmission from satellite to the host
ACK
EOT
( 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.
( 9 ) Sends the next text if ACK is received and
sends EOT and
( 2 ) Receives ENQ.
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.
( 8 ) Sends ACK.
( 10 ) Terminates the operation if EOT
is received.
ENQ
Host Satellite
Dummy
(3bytes)
Terminal No.
(6bytes)
NAK
ACK
( 8 )' Sends NAK if any error
occurs.
ENQ
ACK
Continued on the
next page
Start code Text (parameter) End code
waits for ENQ.
( 1 ) Inquires of the satellite.