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Status Transition Chart
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Receiver
Transmitter
Ready for EOT
Block transmission
Ready for ACK/NAK
Reception of remained block
Ready for finish of receiving data
Ready for command byte counts
Idling = It waits for the reception of ENQ, and or it is dealing with reception.
Reception of EOT
Size
Command bytes+3
T2 stop
Enquiry for
transmission, and
retry times are
within setup
Transmission of
ENQ,
T2 start
Enquiry for transmission, but
retry times are over.
Reset of retry times
Clear of transmission enquiry
T2 time out
One count of retry times
T2 stop
Clear of transmission
buffer
Size becomes 0
Trransmission of check sum
T2 start
Reception of other than
ACK orT2 time out
Count once of retry times
T2 stop
Clearance of transmission
buffer
Reception of ACK
Reset of retry times
T2 stop
Clear of transmission
enquiry
Transmission of
one character
Size
Command bytes–1
Reception of ENQ and
at slave
Return ENQ to reception
buffer
Clear of transmission enquiry
(reception processing)
ENQ
Transmission
of
EOT
T2 start
T2 time out
Transmission of NAK,
T2 stop
Reception of command byte counts
Size
command byte counts + 3
Sum
command byte counts
T1 start, T2 stop
T1 time out
Transmission of NAK,
T1 stop
Success of reception
(Check sum OK'ed when
size becomes o.)
Transmission of ACK,
T1 stop
Failure of reception.
(Check sum OK'ed when
size becomes o.)
T1 start
Reception of one character
Size
Size –1
Sum
Sum + received character
T1 start
Reception of
one character
T1 start
T1 time out
Transmission
of NAK,
T1 stop
4. Communication
Specifications
Note
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