ER-A490 (serv.man4). ERA490 Option Service Manual - Sharp ECR Service Manual (repair manual). Page 8

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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.
( 9 )  Sends the next text if ACK is received and
        sends EOT and waits for ENQ.
( 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)
Start code
Text (parameter)
End code
Text (DATA)
NAK
ACK
( 8 )'  Sends NAK if any error
         occurs.
ENQ
ACK
Continued on the
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