( 13 ) Receives text.
Checks the check sum, text lingth, text data, etc.
And goes to (15) if there is no error in them.
Sends NAK if any error occurs.
( 15 ) Sends ACK.
( 17 ) Terminates the operation if EOT is received.
( 12 ) Sends text corresponding
to the job code.
( 14 ) Resends text block if NAK is received.
Resends text up to two times,and
performs error handling if NAK is still
received after the second resending
of text block.
( 16 ) Sinds the next text if ACK is received,
and sends EOT and terminates the
operation if data transfer is finalized.
Host
Satellite
EOT
Continued from the
preceding page.
Start code
Text (FDS)
End code
Text (DATA)
Two types of
text block
formats are
available.
NAK
(When an error
occurs)
ACK
Note : For the description of
each data block see section
4 (Text block formats)
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