Panasonic minas a4 series Instruction Manual page 289

Status Transition Chart
• RS232 Communication
Reception of ENQ and
at slave
Enquiry for
Return ENQ to reception
transmission, and
buffer(reception processing)
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
Idling =
It waits for the reception of ENQ, and or it is dealing with reception.
T2 time out
ENQ
Transmission of NAK,
Transmission T2 stop
of EOT
T2 start
Ready for command byte counts
Reception of command byte counts
Size
Sum
T1 start, T2 stop
Transmitter
Ready for EOT
T1 time out
Transmission of NAK,
T1 stop
Success of reception
(Check sum OK'ed when
size becomes o.)
Transmission of ACK,
T1 stop
command byte counts + 3
command byte counts
Receiver
Reception of EOT
Size Command bytes+3
T2 stop
Block transmission
T2 time out
One count of retry times
T2 stop Clear of
transmission buffer
Ready for ACK/NAK
Reception of other than
ACK or T2 time out
Count once of retry times
T2 stop
Clearance of transmission
buffer
Failure of reception.
(Check sum OK'ed when
size becomes o.)
Transmission of ACK,
T1 stop
Ready for finish of receiving data
Reception of remained block
Reception of one character
Size Size –1
Sum Sum + received character
T1 start
[Supplement]
Transmission of
one character
Size Command bytes–1
Size becomes 0
T2 START
Reception of ACK
Reset of retry times
T2 stop
Clear of transmission
enquiry
T1 time out
Transmission
of NAK,
T1 stop
Reception of
one character
T1 start
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