ER-A440 (serv.man3). ERA450 Option Service Manual - Sharp ECR Service Manual (repair manual). Page 10

      STATE

Initial

After sending ACK

After sending NAK

EVENT   

0

1

2

ID-ENQ

Satellite checks the terminal No.:If it is correct, satellite
sends ACK and goes to 1.
If it is not correct, Satellite ignores the ID-ENQ.

Satellite checks the terminal No.:If it is correct, satellite
sends ACK and goes to 1.
If it is not correct, Satellite ignores the ID-ENQ.

—

ACK

—

—

—

NAK

—

—

—

EOT

—

After satellite has received TEXT, goes to 0.
(Normal end)
Before satellite has received TEXT, ignores the EOT

Satellite goes to 0.
(ERROR END)

TEXT

—

Satellite checks the text block, if the block is correct,
Satellite sends ACK and goes to 1.
If it is not correct, satellite sends NAK and goes to 2.
If transmission cannot be continued, satellite sends EOT
and goes to 0.
(ERROR END)

Satellite checks the text block, if the block is correct,
Satellite sends ACK and goes to 1.
If it is not correct, satellite sends NAK and goes to 2.
If transmission cannot be continued, satellite sends EOT
and goes to 0.
(ERROR END)

TIME-UP

—

Satellite sends EOT, and goes to 0.
(ERROR END)
Time-up is 7 seconds

The host goes to 0.
(ERROR END)
Time-up is 7 seconds

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