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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
next page

– 4 –

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 terminates the operation if
        data transfer is finaiized.

( 2 )  Receives ENQ.
        Check 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 (FDS)

Text (DATA)

Three types of
text block formats
are available

NCK

ACK

( 8 )'  Sends NAK if any error
         occurs.

– 5 –

( 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)

– 6 –

      STATE

Initial

After sending ID ENQ

After sending text

EVENT   

0

1

2

ENQ

—

—

—

ACK

—

Sends text and goes to 2.

Sends text and goes to 2.
Sends EOT and then goes to 0.
(Normal end)

NAK

—

—

Resends the text and then goes to 2.
If the host has resent the text two times, it sends EOT and
goes to 0.
(ERROR END)

EOT

—

—

The host goes to 0.
(ERROR END)

TEXT

—

—

—

TIME-UP

—

Resends ID ENQ and then goes to 1.
If the host has resent ID ENQ two times,it sends EOT and
goes to 0.
(ERROR END) 

Resends the text and then goes to 2.
If the host has resent the text two times,it sends EOT and
goes to 0.
(ERROR END)

KEY ENTRY

Sends ID ENQ and goes to 1.

—

—

Time-up: One second after sending of ID ENQ. 

Four seconds after sending of text.

 – 7 –