Tcp Status Transitions - Omron CS CJ1W-ETN21 Operation Manual

The TCP socket status can be confirmed using the socket status data returned for the FINS command
SOCKET STATUS READ (2764).
SYN
RECEIVED
CLOSE
snd FIN
FIN
WAIT-1
rcv ACK of FIN
FIN WAIT-2
rcv FIN
snd ACK
CLOSED
LISTEN
SYN SENT
SYN RECEIVED
ESTABLISHED
CLOSE WAIT
FIN WAIT 1
CLOSING
LAST ACK
FIN WAIT 2
TIME WAIT
Appendix C

TCP Status Transitions

Passive OPEN
rcv SYN
snd SYN,ACK
rcv ACK of SYN
CLOSE
snd FIN
rcv FIN
snd ACK
rcv ACK of FIN
Status
Connection closed.
Waiting for connection.
SYN sent in active status.
SYN received and sent.
Already established.
FIN received and waiting for completion.
Completed and FIN sent.
Completed and exchanged FIN. Awaiting ACK.
FIN sent and completed. Awaiting ACK.
Completed and ACK received. Awaiting FIN.
After closing, pauses twice the maximum segment life
(2MSL).
CLOSED
CLOSE
LISTEN
SEND
snd SYN
rcv SYN
snd ACK
rcv SYN,ACK
snd ACK
ESTABLISHED
rcv FIN
snd ACK
CLOSING
Timeout=2MSL
TIME WAIT
Meaning
ACTIVE OPEN
snd SYN
CLOSE
SYN
SENT
CLOSED
WAIT
CLOSE
snd FIN
LAST-ACK
rcv ACK of FIN
CLOSED
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