SENA SS800 - Manual (Page 47)

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The initial state is [Listen]. If there are data coming from the serial port, it will connect to the remote
host as a TCP client and then transfer data through the TCP port. If there is incoming connection
request from the remote host, it will accept the connection as a TCP server, and then transfer data
through the serial port. Thus, users can assume that the Super Series is always connected to the
specified remote host.
Established
Inactivity time-out
TCP connection request rejected
Or internal TCP time-out
TCP connection request accepted
Sync-Sent
Incoming data via serial port
Incoming data
from remote host
In-coming TCP Close request
Listen
Incoming TCP connection request
Incoming data via serial port
Sync-Recvd
Reject
Accept
Closed
Data
Figure 4-6 State Transition Diagram of TCP mode
2) Operations
 Serial data transfer
Whenever the serial device sends data through the serial port of the Super Series, data will be
accumulated on the serial port buffer of the Super Series. If the buffer is full or the time gap reaches